Past IEM Features tagged: nov

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November Clouds at Temp

09 Nov 2016 05:32 AM
Yesterday was yet another pleasant day this November with highs reaching into the 60s for much of the state. This was with mostly sunny skies overhead. The featured chart looks at the observed frequencies of overcast clouds at a given temperature in November for Des Moines. It is interesting to note the three regimes depicted in the chart. For really warm or cool temperatures, it is clear that less cloudiness needs to be present. This makes physical sense as the presence of clouds at night traps heat and during the day, limits heating by the sun.

Voting:
Good: 5
Bad: 3

Tags:   nov   clouds  

November Winds + Dew Points

05 Nov 2015 05:34 AM
Humidity levels have been on the increase with the approach of the storm system that will make its way through Iowa today. As you'd expect, these increased humidity levels have been thanks to transport from our south. The featured chart displays the average dew point by a given wind direction for November for Des Moines. There is a large difference in humidity levels when the wind direction switches from south to northwest. The source region of air masses from those directions easily explains the difference. With southerly air masses influenced by the humid Gulf of Mexico and the northwesterly air masses coming from the arid high plains.

Voting:
Good: 16
Bad: 5
Abstain: 3

Tags:   nov  

Above 70 in November

02 Nov 2015 05:31 AM
The first day of November felt more like early fall with highs into the 70s. The featured chart presents a wind rose during times when the temperature was at or above 70 in November for Des Moines. As you may expect, the winds are predominantly from the south and west during these warm temperatures. Having winds from this direction are important to help bring warmer air into the state and mix down warmer air from above. The warm and breezy weather looks to continue this week until Thursday, so enjoy!

Voting:
Good: 18
Bad: 7
Abstain: 4

Tags:   nov  


Frozen November Periods

02 Dec 2013 05:37 AM
Much of the last part of November was rather cold with high temperatures some days struggling to break freezing. For Des Moines, a period of 92 hours experienced sub freezing temperatures during the month. The featured chart presents the longest such period during November for each year back to 1936. This year's period was the longest since 1996. The first week of December looks rather interesting with some portions of the state experiencing very warm temperatures and others stuck with colder temps. Everybody will be cold by the coming weekend with daily highs back below freezing.

Voting:
Good: 26
Bad: 6
Abstain: 5

Tags:   freezing   nov  


Wetter November

17 Nov 2011 05:56 AM
The precipitation total for this November has already exceeded the total for all of October for Ames. The featured chart presents the difference in precipitation between October and November each year for Ames. 37 of the total 119 years have seen a wetter November than October, so having this happen is about an one in three years chance. There are only small rainfall chances in the forecast.

Voting:
Good: 11
Bad: 1

Tags:   nov11   nov  


60s are nice for November

08 Nov 2010 05:48 AM
High temperatures on Sunday soared well into the 60s and approached 70 degrees in some locations. The featured chart presents the number of days for the past 31 years that the high was above either 60 or 70 degrees for November at Ames. This year has seen two days over 60 with none over 70 for Ames. Our recent history shows that days over 70 in November were rare in the 80s and 90s. Highs this week are expected to continue in the 60s as our nice fall season rolls on.

Voting:
Good: 23
Bad: 1

Tags:   nov  


Just 17 degrees

01 Dec 2009 06:08 AM
The featured chart displays the minimum observed temperature in the state for the month of November. This November's minimum was a mere 17 degrees recorded at Atlantic and is the warmest minimum on record as shown by the chart. Low temperatures this morning to start off December are on the mild side mostly above freezing. Colder weather will arrive tomorrow.

Voting:
Good: 17
Bad: 9

Tags:   nov   nov09  


Upper End

30 Nov 2009 06:07 AM
The featured chart is a plot of observed daily high and low temperatures for Ames during November from this year and all previous recorded years. The plot shows how variable the weather in November can be with highs from the teens to near 80. The red dots, signifying this year, appear mostly on the upper end of the chart with only one day having a high temperature below 40. Temperatures today will finish out November on the mild side as well with highs near 50.

Voting:
Good: 23
Bad: 11

Tags:   nov  


Next day temperature change after a day with a high temperature over 60 in late November

30 degree swings common?

29 Nov 2006 07:09 AM
High temperatures today will be around 30 degrees colder than Tuesday. How often does this happen? The featured image displays the next day temperature change after a day in late November (after the 20th) which had a high temperature over 60 degrees. So for each temperature over 60 degrees, the range of temperature change for the next day is displayed. The overall mean change is around 10 degrees with a 30 degree change rather uncommon (~5% quantile).

Voting:
Good: 16
Bad: 9

Tags:   nov  


Warm southwest winds

22 Nov 2006 12:36 AM
The featured plot is of observed afternoon air temperatures versus the direction of the wind for hourly observations during November back to 1970 when the wind speed was greater than 3 knots from the Des Moines Airport. Confused yet? The black line is a fit by wind direction and the contours are quantile densities, which indicate areas with large number of clustered observations. The plot confirms what we expect with cooler temperatures when the wind is from the Northwest (values 300-360) and warmer when the wind is from the Southwest (values 170-220). The two concentrated areas can be infered from a histogram plot of temperatures observed for 22 Nov with two modes of high temperatures due mostly to these two dominate wind regimes.

Voting:
Good: 40
Bad: 19

Tags:   nov