Past IEM Features tagged: derecho

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August 10 2020

10 Aug 2021 02:29 AM
It has been a year. A year since most every Iowan learned what the term "derecho" meant and now knows not to ever want to experience one again. Derechos have hit or clipped the state a number of times in the past with the previous benchmark event happening in 1988. The 10 August 2020 far eclipsed that event and is currently considered the most costly severe thunderstorm event in US history totaling 11 billion dollars in damage. The featured lapse presents IEM generated composites of NWS RADAR along with NWS watches and warnings for the event in Iowa. You can find an excellent summary of the derecho on Wikipedia. Cedar Rapids was the hardest hit community with the tree damage cleanup recently ending 11 months after the derecho hit!

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Tags:   derecho  

Derecho Power Hit

15 Aug 2020 04:25 PM
The featured graphic is a comparison between the Suomi NPP / VIIRS satellite imagery between July 29th and August 11th. The particular band shown from the satellite is good at showing city lights during clear sky conditions at night time. The damage swath from the August 10th derecho is easily seen with the bullseye hit to Cedar Rapids well shown. Power restoration work is ongoing with full restoration expected to take weeks. See this NASA Website for a better view.

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Tags:   derecho   2020derecho  

75 MPH Gust

14 Aug 2020 06:00 AM
The derecho from Monday should provide fodder for the IEM Daily Feature for the foreseeable future! Today's plot presents one minute interval wind observations from the Des Moines Airport weather station. The chart shows minute by minute readings of wind speed and direction (two minute average of five second samples) and wind gust (peak 5 second sample reading). The quick rise in wind speed is readily seen with the peak value of 50 MPH sustained with gusts to 75 MPH shown. Wind gusts over 50 MPH were observed for over a twenty minute period!

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Tags:   derecho   2020derecho  

The Derecho of 2020

13 Aug 2020 12:58 PM
One of the most significant weather events in Iowa's history happened on Monday, 10 August 2020. A powerful complex of storms bulldozed the state and impacted the major urban centers of Des Moines, Cedar Rapids, Iowa City, and Davenport. The Aqua MODIS satellite data from Tuesday featured in today's map has been making the rounds on the Internet. The map clearly shows the extensive crop damage that happened from west of Des Moines to Davenport. We continue to await a more cloud free day to further see the extent of the crop damage from satellites. Overlain on the map is Local Storm Reports of wind gusts from the National Weather Service.

Tags:   derecho   2020derecho  

Ring of Fire Derecho

30 Jun 2012 05:47 AM
Yesterday's daily feature noted the extreme instability that existed in the atmosphere, but the lack of forcing to realize all that potential energy. On Friday morning, a storm cluster was able to get organized over Illinois and trucked it all the way to the eastern coast producing hundreds of reports of wind damage and should easily meet the derecho classification. The featured image shows a time composite of maximum NEXRAD reflectivity for the event. You can see the path this storm system took as it moved along the classic 'ring of fire' setup with an extremely strong high pressure system to its south. Another cluster of storms got going over Iowa Friday afternoon and caused damage in eastern Iowa. These storms are able to create their own cold air mass at the surface and then push it along providing the lift necessary to realize the available potential energy.

Good: 114
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Tags:   derecho   ringoffire