MESOSCALE DISCUSSION 0717
NWS STORM PREDICTION CENTER NORMAN OK
0534 PM CDT THU APR 24 2008
AREAS AFFECTED...CENTRAL IA...SCENTRAL MN
CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE
VALID 242234Z - 242330Z
CLUSTER OF TSTMS OVER NCENTRAL IA/SCENTRAL MN WILL CONTINUE TO POSE
A THREAT FOR GENERALLY MARGINAL SVR HAIL/DMGG WINDS FOR THE NEXT 3-4
HRS.
SFC ANALYSIS AND VISIBLE SATELLITE DATA SHOW A NARROW CORRIDOR OF
HEATING/DESTABILIZATION HAS DEVELOPED OVER NCENTRAL IA...SCENTRAL
MN. CONVERGENCE ALONG FRONT AND WEAKENING CINH HAVE COMBINED TO AID
IN A NARROW LINE OF TSTMS. THE AIRMASS DOWNSTREAM OF THIS ACTIVITY
WAS MODESTLY UNSTABLE WITH MUCAPE FROM 1500-2000 J/KG. SUFFICIENT
VERTICAL SHEAR /40 KTS FROM 0-6 KM/ WILL SUPPORT SOME STORM
ROTATION WITH THE THREAT OF LARGE HAIL/DMGG WIND. AS THIS ACTIVITY
MOVES INTO SERN MN/NERN IA LATER THIS EVENING...WEAKER INSTABILITY
AND VERTICAL SHEAR SHOULD SUPPORT A DIMINISHING TREND BY 03Z.
..CROSBIE.. 04/24/2008
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