Sunday, October 31, 2010

DAY48SVR: Nws Storm Prediction Center Norman Ok

ACUS48 KWNS 310830
SWOD48
SPC AC 310829

DAY 4-8 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0329 AM CDT SUN OCT 31 2010

VALID 031200Z - 081200Z

...DISCUSSION...

SUBTLE BUT POTENTIALLY SIGNIFICANT DIFFERENCES EXIST IN THE MEDIUM
RANGE MODEL GUIDANCE REGARDING THE EVOLUTION OF AN EASTERN U.S.
TROUGH. THE LATEST ECMWF IS NOTABLY MORE AGGRESSIVE ALLOWING TX
UPPER LOW TO EJECT ACROSS THE GULF OF MEXICO AND FL DURING THE DAY5
PERIOD...PRIMARILY DUE TO STRONG MID LEVEL FLOW FORECAST TO DEVELOP
UPSTREAM ACROSS THE PLAINS WHICH WILL INDUCE HEIGHT FALLS AT LOWER
LATITUDES THAN THE GFS. EVEN SO THE GFS DOES EVENTUALLY ALLOW THE
TX LOW TO PROGRESS ACROSS THE FL PENINSULA WHICH SHOULD ENHANCE THE
CONVECTIVE POTENTIAL IN CONJUNCTION WITH INCREASING SHEAR. IF
SUFFICIENT INSTABILITY CAN RETURN TO FL THERE WILL BE AN INCREASING
RISK FOR ORGANIZED ROBUST THUNDERSTORMS LATER IN THE WEEK.
HOWEVER...GIVEN THE AFOREMENTIONED STRENGTH/TIMING DIFFERENCES IN
THE LATEST MODELS WILL NOT INTRODUCE SEVERE AT THIS TIME.

..DARROW.. 10/31/2010

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