SWOMCD
SPC MCD 292325
ORZ000-WAZ000-300030-
MESOSCALE DISCUSSION 1639
NWS STORM PREDICTION CENTER NORMAN OK
0625 PM CDT SUN JUN 29 2008
AREAS AFFECTED...N CNTRL OR...S CNTRL WA
CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY
VALID 292325Z - 300030Z
CLUSTER OF HIGH BASED THUNDERSTORMS WILL CONTINUE TO DRIFT NWD INTO
WA...WHILE ADDITIONAL STORMS MAY DEVELOP TO THE S. PRIMARY THREATS
WILL BE LARGE HAIL AND STRONG WINDS. A WW IS NOT ANTICIPATED
ATTM...BUT TRENDS WILL CONTINUE TO BE MONITORED.
BROAD SLY FLOW AROUND THE BACKSIDE OF A HIGH AMPLITUDE UPPER RIDGE
AND AHEAD OF THE NEXT LOW HAS ALLOWED FOR MID LEVEL MOISTURE
ADVECTION NWD...WHILE SURFACE DEW POINTS IN THE 40S TO LOW 50S DEW
POINTS ARE ACROSS MUCH OF W/CNTRL OR/WA. A SHORT WAVE NOTED ON WV
IMAGERY MOVING INTO CNTRL OR HAS LIKELY PROVIDED ASCENT FOR
THUNDERSTORM DEVELOPMENT IN A MODERATELY UNSTABLE ATMOSPHERE
CHARACTERIZED BY NEAR 1000 J/KG OF SBCAPE. GIVEN ADEQUATE MID LEVEL
MOISTURE...INITIAL HIGH BASED THUNDERSTORMS WILL BE CAPABLE OF
PRODUCING ISOLD STRONG/SEVERE WINDS AS THEY MOVE NWD INTO THE HOTTER
AND WELL MIXED VALLEYS IN THE COLUMBIA BASIN. ADEQUATE MID LEVEL
FLOW NEAR 30 KTS MAY ASSIST WIND THREAT...WITH CURRENT FLOW FORECAST
TO INCREASE SOMEWHAT OVER THE NEXT FEW HOURS. WITH ELEVATED
INSTABILITY THESE STORMS MAY PERSIST FOR MUCH OF THE NIGHT.
..HURLBUT.. 06/29/2008
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...PDT...MFR...SEW...PQR...
44052008 42682130 43672268 45442291 46942183 47002023
44991963
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