...July 21, 2008 Severe Weather Summary...


After an extremely hot and muggy day in which temperatures soared into the 90s and dew points rose into the 70s across much of Missouri, Kansas, Nebraska, and Iowa, a weak stationary front and sinking upper level disturbance from the north provided enough energy to allow several severe thunderstorms to form during the evening and overnight hours of Monday, July 21st. 

 

Click on Image for Larger Version

Thunderstorms rapidly formed in areas northeast of Chillicothe and Brookfield, with thunderstorms reaching severe levels in less than 10 minutes time!  The first batch of severe thunderstorms quickly produced damaging winds, and even a few tornado touchdowns.  One tornado touchdown was reported to the northeast of the city of Trenton, MO with this weak EFO tornado periodically touching down along a line from east of Spickard to just north of Laredo. 

A second tornadic thunderstorm was produced at nearly the same time just to the east of the first storm.  This time another tornado formed in portions of rural Sullivan county, just to the southeast of the city of Milan.  This weak EF0 tornado was also periodically touching down, finally dissipating to the southwest of the small city of Winigan in Linn county, Missouri.  In addition to the tornadic threat, large hail up to golfball size was reported near Galt, with additional thunderstorms producing 60-65 MPH winds near Kirksville and LaPlata.

Shown below are a few images of the tornadic thunderstorms as they moved south and east Monday evening.  Notice the strong velocity couplet indicative of rotation, and a well defined "hook-echo" in the radar reflectivity data.

 

Click on Image for Larger Version Click on Image for Larger Version
Radar/Velocity at 8:12 PM CDT Radar/Velocity at 8:17 PM CDT

 

 

There were also several other severe thunderstorms later on in the night, with locations near Maryville, Grant City, and Unionville reporting severe hail.  The map below depicts all of the local storm reports from Monday evening, a text listing of the preliminary reports can be found at the bottom of the page.

 

Click on Image for Larger Version
 July 21, 2008 Storm Reports (click on image for Larger Version)

 

 


 

Table of Local Storm Reports

Type Time (UTC) County City Magnitude
Tornado
07/22/2008 01:00 Grundy,MO 7 Se Spickard  
Hail
07/22/2008 01:15 Grundy,MO Dunlap 1.0"
Hail
07/22/2008 01:15 Adair,MO Kirksville 1.5"
Wind Gust
07/22/2008 01:19 Adair,MO Kirksville 59 mph
Tornado
07/22/2008 01:23 Sullivan,MO 5 W Winigan  
Wind Gust
07/22/2008 01:24 Macon,MO La Plata 65 knots
Hail 07/22/2008 01:26 Grundy,MO 4 W Galt 2.0"
Tornado
07/22/2008 01:30 Linn,MO 3 Sw Winigan  
Tornado
07/22/2008 01:31 Grundy,MO 2 N Laredo  
Tornado
07/22/2008 01:39 Linn,MO 4 S Winigan  
Tornado
07/22/2008 01:40 Linn,MO 4 S Winigan  
Tornado
07/22/2008 01:40 Linn,MO 4 S Winigan 2.0"
Hail
07/22/2008 02:47 Nodaway,MO Maryville 1.0"
Hail
07/22/2008 03:13 Nodaway,MO Parnell 1.75"
Hail
07/22/2008 03:50 Sullivan,MO 10 Se Unionville 1.0"
Hail
07/22/2008 04:00 Sullivan,MO 10 Se Unionville 1.0"

 


USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.