IEM Daily Feature
Wednesday, 15 September 2021

Severe Departure

Posted: 15 Sep 2021 05:28 AM

The severe weather season is winding down as we continue into the fall season. The featured map presents IEM calculated departures from average for the number of Severe Thunderstorm Warnings issued per NWS forecast office vs a 2002-2020 average over the same year to date period. Negative values indicate fewer than average number of warnings issued. A clear east/west pattern is present over the contiguous US with a section of the northeast and dessert southwest being the most anomalously active. There is still plenty of time for additional severe weather over our area this year, but observed frequencies continue to decrease as temperatures cool, solar heating decreases, and surface moisture is less plentiful.

Good = 12
Bad = 0