Past IEM Features tagged: spc

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10% Tornado Risk

20 Apr 2017 04:12 AM
With the late morning update yesterday, the Storm Prediction Center had a 10% tornado risk analyzed over parts of Iowa for Wednesday. Thankfully, only a few brief tornadoes were reported near Carroll. The 10% risk threshold only happens a few times each year as highlighted by the featured plot. The map presents the average yearly frequency of having a 10% risk threshold issued. The values for Iowa are in the 1 to 3 days per year range. Kind of interesting to see the highest frequencies show up in the eastern portions of the traditional "Tornado Alley".

Voting:
Good: 7
Bad: 0
Abstain: 1

Tags:   spc   tornado  


Day 1 Slight Risk Climatology

14 Apr 2017 05:33 AM
The Storm Prediction Center issues risk categories and probabilities for severe weather for days (24 hour windows of time) 1 through 8. The featured chart looks at the frequency of having the slight risk category issued for "Day 1" from SPC's morning issued outlook. Interestingly enough and according to this unofficial IEM analysis, the highest frequencies in the USA can be found here in Iowa and parts of extreme eastern Nebraska. The SPC outlooks cover threats from large hail, damaging winds, and tornadoes. So while Iowa does not see the most tornadoes in the country, it does see its fair share of all severe weather threats. Iowa is effectively in a sweet spot for severe weather, including night time thunderstorms that bring hail and wind fueled by the low level jet and Mesoscale Convective Complex activity. The values on the plot are average number of slight risk events per year. Such a event is expected on Saturday with a "Day 2" slight risk currently in effect.

Voting:
Good: 24
Bad: 2
Abstain: 1

Tags:   spc  


Last Moderate Risk

05 Apr 2017 05:36 AM
The Storm Prediction Center has a large portion of the SE United States under a moderate risk of severe weather for today. The featured map presents an IEM analysis of the most recent year of having a moderate risk issued for map location. For most of Iowa, you have to go back to the year 2014 since the last issuance. This year has seen a number of moderate risks issued over parts of the country as the very active start to the severe weather season continues.

Voting:
Good: 12
Bad: 0

Tags:   spc   moderate  


Tornado Watches into Warnings

30 Mar 2017 05:33 AM
Continuing with the theme of Severe Weather Awareness Week in Iowa this week, yesterday was the statewide tornado drill with a test watch and warning issued for the entire state. Today's featured chart looks at the conversion of counties under a tornado watch into a tornado warning. For example, if a tornado watch was issued for 60 counties and 30 of those counties received a tornado warning, that would count with the 50% bin for the plot. About 20% of all tornado watches receive no subsequent warning. Most watches have less than 30% of the counties included eventually get a warning. Thankfully, tornadoes typically are not widespread and limited to a couple of high end storms during a typical watch. Hopefully that is the case today with a significant tornado threat expected over the southern US.

Voting:
Good: 7
Bad: 0
Abstain: 1

Tags:   nws   spc   tornado   watch  


SPC Watch Issuance Confidence

29 Mar 2017 05:36 AM
Continuing with the theme of this week being Severe Weather Awareness Week in Iowa, today's featured plot looks at an analysis of convective watch issuance verification based on probabilities included in Mesoscale Convective Discussions (MCD) issued by the Storm Prediction Center (SPC). The SPC issues the MCD product to provide a short term update and analysis of the storm scale environment during active weather. Prior to most tornado or severe thunderstorm watch issuance, the SPC typically issues a MCD to highlight an area of interest and provides a confidence percentage on if a new watch may be soon issued. The association of an issued watch and the MCD product is not exact, so a simple algorithm was used with reasonable defaults to provide a verification of these percentages. The algorithm being the new watch needed to be issued with 2.5 hours and at least 50% of the watch polygon had to overlap with the MCD polygon. What is the moral of the story? Well, the high confidence MCDs typically get an issued watch, the lower confidence ones typically do not. The next time you read a MCD product from the SPC, check out the confidence noted and see if a subsequent watch is issued!

Voting:
Good: 6
Bad: 0

Tags:   nws   spc   mcd   watcfh  

Fewest Watches

08 Nov 2016 05:35 AM
The featured chart displays the number of year to date Severe Thunderstorm and Tornado Watches issued by the Storm Prediction Center since 1997. The top panel displays the number issued nationwide, the middle panel shows the number that had any part of the initial watch outline overlap Iowa, and the bottom panel shows the percentage of watches that overlapped Iowa for that year. This year's total is a mere 52, which is the lowest found within the modern database. It is interesting to see each of the past five years show up in the least number of watches for the period.

Voting:
Good: 4
Bad: 1

Tags:   spc   watch  


Second Moderate Risk Day

30 Jun 2014 05:46 AM
The Storm Prediction Center has had Iowa in a moderate risk for severe weather for two days in a row now. A few tornadoes were reported in Iowa on Sunday and more are expected today. Heavy rainfall will be a problem again with expected over two inches for parts of eastern Iowa. A severe thunderstorm watch is already in effect this Monday morning with storms rolling across northern Iowa.

Voting:
Good: 15
Bad: 6
Abstain: 5

Tags:   spc  

SPC Watches

23 Apr 2014 05:36 AM
The Storm Prediction Center issues Tornado and Severe Thunderstorm watches. The featured chart displays the number of watches issued for the year to date period since 1997 and the percentage of total watches that have some coverage over Iowa. It has been rather quiet for severe weather activity nationwide, but that looks to change starting today with a number of rounds of severe weather expected over the coming days.

Voting:
Good: 15
Bad: 5
Abstain: 1

Tags:   spc  


8 AM Outlook shown

October Moderate Risk

04 Oct 2013 05:45 AM
The Storm Prediction Center has a moderate risk of severe weather over much of Iowa today including the threat of tornadoes. Having such a threat is somewhat rare for Iowa and even more so when you consider the calendar says October! The powerful storm system bringing this threat is also expected to dump many inches of snow just to our northwest in South Dakota. The air on backside of this system will be a sensible change with highs only in the 50s for the weekend and more chances of precipitation.

Voting:
Good: 86
Bad: 5

Tags:   spc  


Watch Frequencies

20 Jul 2013 07:50 PM
A number of severe thunderstorm watches have been issued today by the Storm Prediction Center (SPC). None of these in Iowa though. Anyway, the featured chart presents the daily frequencies of SPC issued watches and the ratio between the number of severe thunderstorm versus tornado watches issued. Both have clear annual signals with their respective peaks happening at different times of the year. The largest number of watches (dots) occur during the strongest battles of the air masses during the spring season. The bars shows the ratio of severe thunderstorm versus tornado warnings. This ratio peaks out during the first two weeks of August as temperatures are the warmest over the United States and the cool air masses are well north leading to less wind shear in the atmosphere.

Voting:
Good: 74
Bad: 7

Tags:   spc   watch  


Six days of Slight Risk

06 May 2012 11:14 AM
Today (Sunday) will end our streak of having the Storm Prediction Center forecast slight risk of severe weather in Iowa. The featured image displays the categorical outlook issued each day at 7 AM. We have one more round of severe weather to go this afternoon and evening before the weather straightens out some this coming week. It would be good to see a dry stretch of weather to help get the agricultural crops planted in the state.

Voting:
Good: 67
Bad: 6

Tags:   spc   may12  


Severe Weekend

13 Apr 2012 05:58 AM
The Storm Prediction Center has a rare high risk of severe weather forecasted for Saturday with portions of Iowa included in a moderate risk. This risk is due to the combination of springtime instability and strongly sheered wind profiles (winds changing direction and/or speed with increasing height in the atmosphere). This environment supports classic and long-lived supercell thunderstorms. Besides the severe weather, Iowa is also expected to pick up some much needed rain with many locations expected to get much more than an inch of rain.

Voting:
Good: 64
Bad: 34

Tags:   spc  


Large Moderate Risk

02 Mar 2012 05:57 AM
After a punishing year of severe weather in 2011, this year appears to be attempting a repeat. The Storm Prediction Center has a very large area outlined for a moderate risk of severe weather today and into Saturday morning. This storm closely follows a deadly storm system on Wednesday that brought tornadoes to Kansas, Illinois and other states. Iowa will miss the severe weather and perhaps get a bit of snow.

Updated the feature graphic to show the 11:30 AM outlook with the high risk.

Voting:
Good: 35
Bad: 4

Tags:   spc  



Watches by year

16 Nov 2011 05:57 AM
The past few days have seen bouts of severe weather over various parts of the country. The Storm Prediction Center issues tornado and severe thunderstorm watches in advance of these storms. The featured chart presents the year to date totals of watches issued for Iowa and Texas since 1997. Last year was the only year Iowa has beaten Texas in total watches. The bottom chart shows the percentage of total watches issued that covered a portion of Iowa. This year's percentage is the second lowest behind 1997.

Voting:
Good: 11
Bad: 5

Tags:   spc  


Tornado Watches and wind

12 Jul 2011 06:19 AM
The featured chart presents an analysis of averaged surface wind speed and direction over the domain of a Storm Prediction Center issued tornado watch that was centered over Iowa. The wind values are for a period near issuance. The symbols represent the number of tornadoes reported within the watch box. The plot nicely shows that winds from the southeast to southwest are the most common with a sharp cutoff at the southwest direction. Tornadoes form in environments of wind sheer where wind speeds and/or direction change with increasing height in the atmosphere. So having surface winds out of the southeast and upper level winds out of the west provide the sheared environment in Iowa.

Voting:
Good: 17
Bad: 9

Tags:   spc   tornado  


Busy Monday

20 Jun 2011 05:55 AM
The Storm Prediction Center has a moderate risk of severe weather forecasted for portions of Iowa today. This is thanks to a spring like storm system that will move out into the plains today. The passage of this system will usher back in cold air for this time of year with highs only in the 60s later this week!

Voting:
Good: 17
Bad: 3

Tags:   spc  


A month faster than last year

27 Apr 2011 07:39 AM
The nation's recent stretch of severe weather continues with a high risk of severe weather issued today over portions of Alabama. The Storm Prediction Center has issued its 228th watch of the year this morning. Last year, it took until the 27th of May for the 228th watch of the year to be issued as shown by the featured chart. Three other years since 1997 have seen more watches issued by this date than this year.

Voting:
Good: 8
Bad: 3

Tags:   spc  


three months down, nine to go

01 Apr 2011 05:54 AM
The featured chart presents the yearly number of SPC issued watches before and after 1 April. This year has seen about twice as many watches to this date than last year, but only half the total of 2008 and one of the smaller totals since 1997. The largest total of watches on this chart (2003) started off with a near average total prior to 1 April. Chances of severe weather arrive in Iowa on Sunday and hopefully some warmer weather as well.

Voting:
Good: 20
Bad: 8

Tags:   spc  


First moderate risk of the year

24 Feb 2011 05:58 AM
The Storm Prediction Center has issued a moderate risk of severe weather for today. This is the first such issuance this year. If the IEM archive is correct, the first moderate risk last year was not until the 22nd of April. Tornadoes and damaging winds are expected.

Voting:
Good: 18
Bad: 4

Tags:   spc  


IEM computed values

Slight risks return

25 Oct 2010 05:09 AM
The Storm Prediction Center issued a slight risk of severe weather over Iowa this past Saturday making for a month since the last such issuance for Iowa. The featured graph presents the daily areal coverage of slight convective risk over Iowa for this year and last. Interesting to see lack of slight risk from the middle of August 2009 until April of this year. Slight risk of severe weather is over the state again for Monday with this week representing a major change from the weather we have seen for the past month.

Voting:
Good: 37
Bad: 11

Tags:   spc  


Watching more than Texas

16 Sep 2010 05:56 AM
The Storm Prediction Center issued another watch for Iowa yesterday making for the 113th watch issued this year that covered portions of Iowa. The featured graph displays the number of watches year to date issued for Iowa and Texas. This is the first year since 1997 that Iowa has seen more watches. The bottom graph displays the percentage of all watches issued that cover a portion of Iowa. This year has seen the highest percentage! Another reason why 2010 has been an exceptional year.

Voting:
Good: 33
Bad: 5

Tags:   2010   spc  


SPC 13z Day1 Outlook

Tornado threat to end April

30 Apr 2010 08:06 AM
The first four months of the year have been very quiet for tornado activity in Iowa. The Storm Prediction Center has a slight risk of severe weather out for Friday with considerable tornado probabilities forecasted for this afternoon as shown by the featured map. Storms should get going early this afternoon and then race eastward at over 50 miles per hour. All of this nasty weather will sweep east and leave us with a very nice weekend to start off May!

Voting:
Good: 40
Bad: 24

Tags:   spc  


Severe weather returns

23 Apr 2010 05:11 AM
After a rather quite start to the severe weather season, a large storm system to our west will cross the plains today and this weekend bringing wide spread severe weather. The featured composite image is the Storm Prediction Center forecast for Friday and Saturday. Iowa is under a slight risk for both days with expansive moderate risk shown over the southern plains.

Voting:
Good: 79
Bad: 16

Tags:   spc  


June starts off with a bang

01 Jun 2009 05:35 AM
The Storm Prediction Center has most of Iowa outlined in a slight risk for severe weather today as strong storms are expected to develop this afternoon along a stalled out boundary bisecting the state. The biggest threat may be the heavy rain expected as storms will not be in a hurry to move anywhere and will tend to train over the same areas. All of this makes for an active start to June after a rather calm last half of May.

Voting:
Good: 17
Bad: 3

Tags:   spc  


VORTEX2 Buzzkill

27 May 2009 05:57 AM
VORTEX2 is the code name for a large scientific field project to measure stormscale environments around tornadic storms. The project has been out chasing storms since about the 10th of May, but has had very little organized severe weather to work with. In fact, the dearth of severe weather for this time of year is rather unprecidented. The featured image displays the daily number of SPC issued watches for May since 1997 (oldest date of digital records). Areas of white indicate no watches issued and you can see the drought of 2009 is largest area on this plot. Greg Carbin of SPC wrote an interesting blog post on how rare this quiet period of May has been. Based on forecast models, business for the VORTEX2 project appears to be picking up with a more organized severe weather expected.

Voting:
Good: 27
Bad: 7

Tags:   spc  


click image for larger view

Watching for hours

15 May 2009 06:14 AM
The featured map is the number of hours counties have been under either a severe thunderstorm or tornado watch this year. While Iowa has generally seen less than 24 hours of total watch time, the areas in red indicate counties over 60 hours (4 and a half days). Some strong thunderstorms are expected today, but the worst of the weather will stay to our south.

Voting:
Good: 41
Bad: 13

Tags:   spc  


February Slight Risk

09 Feb 2009 06:13 AM
The Storm Prediction Center has issued a slight risk of severe weather today for most of Western Iowa. A spring like storm system will quickly move through the state today with the possibility of hail, strong winds, and even a few tornados.

Voting:
Good: 32
Bad: 5

Tags:   spc  


SPC day1 outlook on 23 Sep 2008

Severe weather returns?

23 Sep 2008 07:30 AM
The Storm Prediction Center has Northwest Iowa outlined in a slight risk for severe weather today with the passage of a cold front. It has been a while since Iowa has experienced severe weather, which nobody will mourn over after our wild and rough spring/summer. Temperatures will remain mild, even on the other side of this front for the last week of September.

Voting:
Good: 23
Bad: 8

Tags:   spc  


SPC day1 outlook

And yet another high risk!

05 Jun 2008 08:22 AM
The Storm Prediction Center has a very large high risk of severe weather for today. The atmospheric setup has many of the severe weather indices pegged with extreme amounts of wind shear and instability present. Perhaps the most concerning threat is the flooding potential with any additional rain producing flooding. Needless to say, the active weather pattern continues.

Voting:
Good: 30
Bad: 7

Tags:   spc  


SPC day1 outlook for 29 May 2008

Everybody on edge

29 May 2008 08:19 AM
The Storm Prediction Center has issued a high risk of severe weather for Thursday. The atmosphere over Eastern Nebraska and Western Iowa will be primed for a severe weather outbreak with large amounts of instability juxtaposed over strong wind sheer (which helps the thunderstorms to rotate). The particularly dangerous aspect of this setup is that the tornado threat is expected to continue after sunset along with a good chance of a widespread damaging wind event. Just what we did not want to see.

Voting:
Good: 20
Bad: 14

Tags:   spc  


day1 outlook for 13 May 2008

More bad weather

13 May 2008 08:06 AM
An area that was hit hard last Saturday Night is expected by the Storm Prediction Center to experience rough weather again with significant tornadoes possible. For Iowa, we may get a couple of strong storms with large hail being the primary threat.

Voting:
Good: 15
Bad: 8

Tags:   spc  


SPC day1, day2, day3 outlook

3 days of slight risk

20 Jun 2007 06:54 AM
The Storm Prediction Center has Iowa highlighted in a slight risk for the next 3 days. The risk is primarily due to the forecasted development of numerous mesoscale convective systems (MCS) that will thrive off of the deep moisture and drive across the state mainly during the night time hours. This period is also the strongest heating days by the sun, since the days are the longest and the sun is the highest (most direct to ground) in the sky.

Voting:
Good: 21
Bad: 5

Tags:   spc  


SPC day1 outlook for 7 Jun 2007

Severe Thursday

07 Jun 2007 07:51 AM
It is hard to not feature the Storm Prediction Center outlook again today. A lid of warm air that suppressed widespread storms in our area yesterday is expected to cool and allow explosive thunderstorm development today. The damaging wind threat looks to be the primary severe weather mode with a chance of a few long duration violent tornadoes and large hail. Please watch the weather closely today.

Voting:
Good: 29
Bad: 8

Tags:   spc  


SPC outlooks for Wednesday and Thursday

Buckle up

06 Jun 2007 07:20 AM
The weather is set to get rough today and tomorrow with an unseasonally strong storm system developing this morning over the high plains. The Storm Prediction Center has parts of Iowa in a moderate risk for both days with the main threat for Iowa arriving on Thursday. The limiting factor for this event may be the amount of rich moisture that is available to be pulled north. This moisture provides the fuel for thunderstorm development.

Voting:
Good: 21
Bad: 4

Tags:   spc  


SPC 6z outlook for 21 Mar 2007

Hail threat today

21 Mar 2007 07:14 AM
The Storm Prediction Center has Iowa in a slight risk for severe weather today as a cold front will sweep the state later this evening. The primary threat will be large hail, but if the sun is able to break out during the afternoon, an isolated tornado may be possible as well. The sun provides low level heating which makes for a more energetic environment for thunderstorms to feed off of.

Voting:
Good: 26
Bad: 4

Tags:   spc  


8 AM SPC day1 outlook

A moderate risk

03 Oct 2006 08:08 AM
The Storm Prediction Center has a moderate risk of severe weather forecasted for today over most of NE Iowa. Abnormally warm and moist air mass will be in place for explosive thunderstorm development this evening with a very good chance of these storms producing tornadoes.

Voting:
Good: 10
Bad: 2

Tags:   spc  


8 AM Day1 outlook for 22 Sept 2006

Second severe season

22 Sep 2006 08:08 AM
The Storm Prediction Center has a good portion of Missouri, Illinios, and Arkansas under a moderate risk for the chance of tornadoes and damaging winds. After a quiet summer (severe weather wise), the transition to fall has brought a number severe weather outbreaks.

Voting:
Good: 21
Bad: 6

Tags:   spc  


SPC day1 outlook

Active day forecasted

24 Aug 2006 07:19 AM
The Storm Prediction Center has a moderate risk of severe weather forecasted for today. All forms of severe weather appear to be possible along a stalled out warm front just north of the Iowa/Minnesota border. The storm system will eventually slide thru the state on Friday bringing the threat of severe weather south.

Voting:
Good: 17
Bad: 2

Tags:   spc  


7 AM SPC day1 outlook for 9 Aug 2006

5% Tornado Threat

09 Aug 2006 07:36 AM
The Storm Prediction Center has forecasted a 5% tornado risk for today over all of Western Iowa. The value represents the chance of 1 tornado occuring within 25 miles of any point in the area. Storms will fire along a boundary this afternoon with the chance to produce a few tornados.

Voting:
Good: 8
Bad: 5

Tags:   spc  


SPC 6Z outlook on 19 Jul 2006

Strong storms today

19 Jul 2006 06:49 AM
The Storm Prediction Center has issued a moderate risk of severe storms for an area just north of Iowa today. A majority of Iowa will be under a very warm layer of air inhibiting storm development. Temperatures will soar into the upper 90s again with high humidities.

Voting:
Good: 15
Bad: 8

Tags:   spc  


Day2 convective outlook for 12 Nov 2005

Severe Weather Saturday?

11 Nov 2005 07:12 AM
The Storm Prediction Center has a slight risk of severe weather analyzed for Iowa on Saturday. A strong cold front will approach the state and should kick off some thunderstorms late Saturday afternoon. The main threat appears to be gusty winds. Temperatures will continue to be very warm with highs in the mid 60s.

Voting:
Good: 36
Bad: 21

Tags:   spc  


1 AM SPC Day1 Outlook for 19 Aug 2005

Stormy Friday

19 Aug 2005 07:16 AM
The Storm Prediction Center has a slight risk of severe storms forecasted for all of Iowa on Friday. Strong storms will develop and push east overnight. The main threats appear to be hail and wind, but a few tornadoes are possible as well. After the storms, this weekend looks amazing with sunny skies and comfortable temperatures.

Voting:
Good: 19
Bad: 9

Tags:   spc  


1AM SPC outlook for 29 Jun 2005

Moderate risk today

29 Jun 2005 07:16 AM
The Storm Prediction Center has forecasted a moderate risk of severe weather over the NE quarter of Iowa. There is also a moderate feeling of uncertainty with storms/clouds already in the state this morning and the chance that these storms could persist through the day. If this happens, the significant severe weather threat would shift south into Southern Iowa. Either way, the weather bears watching today.

Voting:
Good: 10
Bad: 8

Tags:   spc  


5 AM SPC day1 outlook for 13 Jun 2005

Unsettled weather continues

13 Jun 2005 07:16 AM
The Storm Prediction Center has a moderate risk of severe weather forecasted for Eastern Iowa, SW Wisconsin, and Illinios for today. A strong surface low pressure system to our west will combine with a upper atmosphere jet to provide the spin necessary to produce rotating storms which lead to large hail and possibly tornados. A break to this pattern is in the forecast with 3 days of dry weather forecasted after Wednesday.

Voting:
Good: 14
Bad: 6

Tags:   spc  


SPC day1 and day2 outlook beginning 10 May 2005

Two chances

10 May 2005 06:49 AM
The Storm Prediction Center has Iowa within the slight risk probability zone for severe thunderstorms today and tomorrow. Disregarding the hail and wind threat, the real threat looks to be flooding rainfall from slow moving storms. Some locations will easily pick up more than 3 inches of rain. Southern Iowa can withstand a couple inches of rain without major issues, but Northern Iowa has received heavy rain recently and would have a more difficult time absorbing more water.

Voting:
Good: 12
Bad: 2

Tags:   spc  


8 AM SPC Day1 Outlook on 5 Apr 2005

Marginal Threat

05 Apr 2005 08:17 AM
The Storm Prediction Center has a small portion of Western Iowa in a slight risk for severe convection for storms that are expected to fire late this evening. The limiting factors today will be a considerable layer of warm air just above the surface (cap) and limited surface heating due to clouds. As with most springtime storm systems, the dynamics are strong enough to overcome some of these limiting factors. Having said all that, the best chance for severe weather will be to our south.

Voting:
Good: 8
Bad: 2

Tags:   spc  


12Z day1 outlook from SPC

Somebody will get it

22 Oct 2004 08:17 AM
Somebody refers to folks in the MidWest. It refers to any number of severe weather modes from tornados to hail to wind. The best chances for severe weather look to be in Western Iowa where they should see some sunshine today to help destabilize the atmosphere even further. A surface dry line will approach this area by very late afternoon, which for Iowa, is a very omnious sign for severe weather.

Tags:   spc  


SPC Day1 outlook at 13z on 26 Aug 2004.

Big Fat Moderate

26 Aug 2004 08:21 AM
The Storm Prediction Center has put us in a moderate risk for severe weather this afternoon and evening. Severe weather parameters are coming together very nicely today for a statewide outbreak of severe weather. Iowa will probably add to its already gaudy total of tornadoes reported for the year.

Tags:   spc  


SPC outlook for 24 May 2004.

Extremely Dangerous Situation.

24 May 2004 07:32 AM
Monday could be a repeat of the weather Iowa experienced on Saturday. This repeat performance, unfortunately, appears very likely with an even better chance of long lived and destructive tornados. The hope is that the heaviest rainfall occurs to the south of I-80, which would avoid having heavy rainfall in areas that can not withstand any more rainfall. It will be a long day.

Tags:   spc  


SPC outlook on 21 May 2004.

Perpetual Slight

21 May 2004 08:17 AM
Seems like the Storm Prediction Center has had us in the slight risk category for the entire week. A frontal boundary has been waffling (hmmm, waffles) around the state and has been a pesky boundary for forecasters to predict. Severe weather chances will continue as long as we have this feature in the state.

Tags:   spc  


12z SPC day1 outlook for 19 May 2004.

Explosive Convection

19 May 2004 08:16 AM
Just about every storm chaser in the midwest will probably be in E Nebraska / W Iowa this afternoon. The atmosphere is primed for an explosive convective event today. Numerous long lived super cells are possible with some of these cells producing tornados.

Tags:   spc  


12z SPC outlook on 6 May 2004.

Slight Risk

06 May 2004 07:32 AM
The Storm Prediction Center has placed most of Iowa in a slight risk for severe weather today. Thunderstorms are expected to fire along a surface boundary later this afternoon and they have the potential to be severe.

Tags:   spc  


SPC convective outlook issued 6Z 14 Jul 2003.

Moderate Risk

14 Jul 2003 07:36 AM
The Storm Prediction Center has placed most of Iowa in a moderate risk for severe weather today and tonight. Thunderstorms will fire this afternoon and continue on this evening.

Tags:   spc