SPC MESOSCALE DISCUSSION 1602 FOR SOUTHERN MINNESOTA/NORTHWESTERN
IOWA
CONCERNING...SEVERE THUNDERSTORM WATCH 602...

VALID 211656Z - 211830Z

LATEST RADAR LOOPS SHOW A SCATTERED AREA OF STRONG TO OCCASIONALLY
SEVERE THUNDERSTORMS MOVING SOUTHEASTWARD THROUGH PORTIONS OF
SOUTHERN MINNESOTA AND NORTHWESTERN IOWA.  IT APPEARS THE STRONGEST
ACTIVITY IS CURRENTLY OVER SOUTH CENTRAL MINNESOTA...BUT IT IS
MOVING TOWARD AN AREA THAN HAS BEEN STABILIZED BY EARLIER STORMS. 
THERE HAS BEEN SOME WEAKENING OF THESE STORMS DURING THE PAST HOUR
OR SO AS OUTFLOW HELPS TO STABILIZE THE AREA.  A WELL DEFINED
OUTFLOW BOUNDARY WAS NOTED MOVING ACROSS WESTERN IOWA...AND
ADDITIONAL CONVECTION HAS BEEN DEVELOPING ALONG THIS FEATURE AND
SOME ADDITIONAL DEVELOPMENT IS POSSIBLE. THE AIR MASS OVER
SOUTHEASTERN PORTIONS OF THE WATCH AREA REMAINS VERY UNSTABLE...
AND THIS AREA WILL BE THE MOST LIKELY TO EXPERIENCE ANY MORE THAN
MARGINAL SEVERE ACTIVITY.  

..REHBEIN.. 07/21/01