SWOMCD
SPC MCD 150900
SDZ000-151000-
MESOSCALE DISCUSSION 1833
NWS STORM PREDICTION CENTER NORMAN OK
0400 AM CDT WED SEP 15 2010
AREAS AFFECTED...PORTIONS SD.
CONCERNING...SEVERE THUNDERSTORM WATCH 662...
VALID 150900Z - 151000Z
THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 662
CONTINUES.
PER COORD W/ABR AND FSD...WW HAS BEEN CLEARED FOR CENTRAL-NRN AND
ERN PORTIONS OF SD. REMAINDER WW MAY BE CANCELED BEFORE SCHEDULED
10Z EXPIRATION.
EARLIER STG-SVR TSTMS OVER SERN SD HAVE MOVED EWD OVER PORTIONS SRN
MN AND NWRN IA AND WEAKENED...ATOP STABLE BOUNDARY LAYER...AND E OF
STRONGEST 850 MB FLOW. MEANWHILE...ELEVATED TSTMS ARE INCREASING IN
COVERAGE ACROSS CENTRAL/N-CENTRAL SD...RESULTING FROM UPSCALE
EVOLUTION OF EARLIER SVR TSTMS OVER RAP AREA. THIS ACTIVITY --
SUPPORTED BY WAA AND MOISTURE TRANSPORT ON NOSE OF 35-45 KT LLJ --
IS LIKELY TO PERSIST AND MOVE FARTHER EWD/ENEWD ACROSS CENTRAL-ERN
SD DURING REMAINDER PRE-DAWN HOURS...AND ISOLATED HAIL NEAR SVR
LEVELS CANNOT BE RULED OUT. HOWEVER...GUST POTENTIAL WILL DIMINISH
AS
1. FOREGOING BOUNDARY LAYER CONTINUES TO STABILIZE DIABATICALLY AND
2. ACTIVITY MOVES INTO REGIME OF STRENGTHENING MLCINH WITH EWD
EXTENT...ALSO RELATED TO OUTFLOW EFFECTS OF EARLIER CONVECTION.
..EDWARDS.. 09/15/2010
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...FSD...ABR...UNR...
LAT...LON 43799904 43650039 43840149 44460197 45350132 45799956
45569799 44839737 44149797 43799904
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