SWOMCD
SPC MCD 090056
SDZ000-WYZ000-090230-
MESOSCALE DISCUSSION 1830
NWS STORM PREDICTION CENTER NORMAN OK
0756 PM CDT SAT AUG 08 2009
AREAS AFFECTED...PARTS OF WRN SD
CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY
VALID 090056Z - 090230Z
THE THREAT FOR ISOLATED SEVERE STORMS CAPABLE OF LOCALLY STRONG WIND
GUSTS AND HAIL IS EXPECTED TO SPREAD FROM THE WY/SD EWD ACROSS PARTS
OF WRN SD THIS EVENING. A WW IS NOT CURRENTLY ANTICIPATED.
TSTMS WHICH INITIATED THIS AFTERNOON OVER PARTS OF SERN MT AND NERN
WY APPEAR TO BE MERGING INTO A CLUSTER FROM CROOK COUNTY WY INTO
BUTTE COUNTY SD AS OF 0050Z. INDIVIDUAL STORM MOTIONS WERE
270/25-30 KT. WHILE MIDLEVEL LAPSE RATES ARE NOT PARTICULARLY
STEEP...00Z RAP SOUNDING INDICATED THE PRESENCE OF A RELATIVELY
MOIST BOUNDARY LAYER WITH MLCAPE OF AROUND 500 J/KG. INSTABILITY
SHOULD DECREASE WITH TIME THIS EVENING WITH THE ONSET OF NOCTURNAL
COOLING. HOWEVER...THE PRESENCE OF A STRENGTHENING SYSTEM COLD POOL
AND AROUND 50 KT OF DEEP-LAYER SHEAR MAY SERVE TO MAINTAIN STORMS
WITH A CONTINUED THREAT OF LOCALLY STRONG WIND GUSTS AND HAIL.
..MEAD.. 08/09/2009
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...UNR...
LAT...LON 43500322 43690381 44770407 45270383 45340314 44830213
44210199 43650236 43430302 43500322
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