MESOSCALE DISCUSSION 0462
NWS STORM PREDICTION CENTER NORMAN OK
0358 PM CDT TUE APR 15 2003
AREAS AFFECTED...AR SD...SRN MN
CONCERNING...SEVERE THUNDERSTORM POTENTIAL
VALID 152058Z - 152330Z
THUNDERSTORMS ARE EXPECTED TO DEVELOP BY EARLY EVENING. LARGE
HAIL AND DAMAGING WINDS WILL BE LIKELY. AREA WILL BE MONITORED
FOR POSSIBLE WW DURING THE NEXT 1-2 HOURS.
LATEST OBJECTIVE ANALYSIS SHOWS WEAKENING CAP OVER SERN SD INTO
SRN MN...WITH LESS THAN 150 J/KG OF 100 MB MLCIN. STORMS ARE
EXPECTED TO DEVELOP ALONG WARM FRONT WHERE AN INCREASING LOW
LEVEL JET WILL HELP LIFT INCREASING MOISTURE. 18Z RUC DEVELOPS
PRECIPITATION IN THESE AREAS NEAR 00Z...FROM SERN SD INTO SRN MN.
MDT INSTABILITY...STEEP LAPSE RATES AND PERSISTENT FORCING WILL
FAVOR SEVERE THUNDERSTORMS WITH LARGE HAIL AND DAMAGING WINDS.