As you know the National Weather Service issues tornado warnings based on radar and visually indicated tornadoes. 1/2 of tornado warnings are radar
indicated and cannot be confirmed on the ground.
Kentucky was an example of that. Warnings but no touchdowns so my model looks like it didn't pick up a touchdown chance down there.
The model is an attempt to figure out which areas are prone during the period forecasted for tornado-genesis ( development).
Here was today's forecast and event. I'll try to do this as good as possible. It is not valid anymore as the map time-frame passed. The maps go
by risk of touchdown to intensity of tornado. Still working the bugs out but here you go.
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Tornado Risk Analysis Model -
March 8, 2009 - 7:30am Pacific
The model shows mostly very slight risk spots across Illinois and Indiana today. The areas of most concern will lie within and ahead of the frontal
zone in Southeastern Illinois and Southwestern Indiana where the yellow spots are.
This image shows the frontal zone plus a lone supercell ahead of the front. It does have yellow dynamics which is good for a weak tornado. So my
forecast would be for the yellow part of Indiana with the supercell ahead of the front as well. We'll see if that storm does form ahead of it.
Image here
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Tornado Risk Analysis Model -
March 8, 2009 - 1:20pm Pacific
The new output for this evening shows the activity moving in a East-Northeasterly direction across Illinois. The map below has tornado reports from
SPC about where the yellow shades were.
The yellow shades continue into Western Ohio so I have no reason to believe these will die down. Some instability will simmer toward Ohio, however a
good thin corridor of instability will remain for possible tornadoes. the slight category isn't all that strong but does support a tornado watch.
Image here
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These outputs were made 4-6 hours before the storm systems hit each forecasted zone. The first map shows areas where NOAA had tornado reports on the
ground. The map to tornado reports can be viewed here...
www.spc.noaa.gov...
comparing the outputs to the red dots in IL,IN/OH confirm the model has some merit and has some work to do to try to get into production for future
forecasting ...