This application dynamically generates many
types of graphs derived from various IEM data sources.
Feel free to use these generated graphics in whatever way
you wish.
This application presents a calendar of Storm Prediction Center or Weather
Prediction Center outlooks by state, WFO, or county. The GIS spatial operation
done is a simple touches. So an individual outlook that just barely
scrapes the selected area would count for this presentation. Suggestions
would be welcome as to how this could be improved.
This app attempts to not double-count outlook days. A SPC/WPC Outlook
technically crosses two calendar days ending at 12 UTC (~7 AM). This
application considers the midnight to ~7 AM period to be for the
previous day, which is technically not accurate but the logic that most
people expect to see.
When plotting hail, tornado, or wind probabilities, a "H" will appear on
days that had "hatched"/"SIGNificant" risk. A "C1", "C2", or "C3" will appear
for days with those conditional risks. Note that this isn't an exact
science as the hatched and probability risk are not checked to see if they
spatially/temporally overlap each other.
Updated 15 July 2025: An option was added to just plot
a single threshold. This logic gets a bit tricky as consider an example of
Iowa being engulfed by a moderate risk, but you choose to only plot enhanced
risk days. The plot would show an enhanced risk for that day eventhough
it was a moderate.
3
Generated Chart
Based on recent timings, plot generation
averages 3 seconds. Please wait while your
chart is being generated...
