Severe Thunderstorms Roll Through Northern Missouri - March 21, 2007


A squall line of strong to severe thunderstorms signaling the arrival of a cold front, nosed into the northwest tip of Missouri Wednesday evening.  As the tail end of this line of storms passed through Rockport,  penny size hail was reported.  Very strong southwest winds between 50 and 60 mph just off the ground, continued to feed moist unstable air into the back side of the complex of storms. As the tail end of the squall line moved east of St. Joseph, a severe thunderstorm exhibited supercell characteristics over southern Caldwell county.  Storm spotters reported seeing a rotating wall cloud between Bogard and Tina as well as just west of Bosworth. 

Fire department and local law enforcement officials reported 4 inch tree limbs and power lines down. In addition, some tin was peeled off a barn. It has been determined that this damage was produced by strong straight line winds associated with the severe thunderstorm.   Hail larger than golfball size fell in Bosworth as the storm passed through and quarter size hail fell to the north in Hale.  During the next 20 to 30 minutes the supercell weakened as it moved into southeast Carroll county.  By the time the storm reached Keytesville shortly after 330 am the hail was down to penny size.  No additional reports of damage were received as the storm moved east of Keytesville.


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Base Reflectivity Storm Relative Velocity

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