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    Day 2 Outlook >
Dec 20, 2014 1300 UTC Day 1 Convective Outlook
Click to see valid 1Z - 12Z Day 1 Convective Outlook
Updated: Sat Dec 20 12:49:11 UTC 2014 (Print Version | 20141220 1300Z Day 1 shapefile | 20141220 1300Z Day 1 KML)
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 Forecast Discussion
   SPC AC 201249

   DAY 1 CONVECTIVE OUTLOOK  
   NWS STORM PREDICTION CENTER NORMAN OK
   0649 AM CST SAT DEC 20 2014

   VALID 201300Z - 211200Z

   ...NO TSTM AREAS FORECAST...

   ...SUMMARY...
   NO THUNDERSTORMS ARE EXPECTED OVER THE CONTINENTAL U.S. TODAY.

   ...SYNOPSIS...
   PROGRESSIVE UPPER-AIR PATTERN IS FCST TO CONTINUE ACROSS CONUS THIS
   PERIOD.  BY 12Z...PHASING/MERGER OF SEVERAL SMALL SHORTWAVE TROUGHS
   NOW OVER WRN CONUS WILL CONTRIBUTE TO HEIGHT FALLS ACROSS GREAT
   PLAINS STATES...WITH DEVELOPMENT OF TROUGHING AND RELATED CYCLONIC
   FLOW OVER DAKOTAS...CENTRAL PLAINS...TX AND MUCH OF NRN/WRN MEX. 
   INITIAL SHORTWAVE TROUGH -- NOW EVIDENT IN MOISTURE-CHANNEL IMAGERY
   FROM OH TO AL -- IS EXPECTED TO MOVE ENEWD THROUGH TODAY.  SRN
   PORTION WILL MOVE OFFSHORE ATLC COAST AND WEAKEN FURTHER...WHILE NRN
   PORTION IS ABSORBED INTO SMALL 500-MB LOW NOW OVER W-CENTRAL NY.

   AT SFC...FRONTAL-WAVE LOW NOW OVER N-CENTRAL GULF...S OF LA
   COAST...SHOULD MOVE EWD ALONG FRONT AND WEAKEN AS UPPER SUPPORT
   MOVES AWAY.  THIS WILL LEAD TO DECELERATION AND EVENTUAL FRONTOLYSIS
   OF BAROCLINIC ZONE NOW EXTENDING SWWD FROM LOW ACROSS W-CENTRAL
   GULF. ANOTHER WEAK FRONTAL-WAVE LOW INITIALLY OFFSHORE NERN FL WILL
   MOVE ENEWD OVER ATLC SE OF SC AND S OF OUTER BANKS.  WHILE
   ASSOCIATED/ELEVATED WAA REGIME N OF LOW MAY SUPPORT SOME
   CONVECTION...THUNDER POTENTIAL THEREWITH APPEARS MINIMAL AND WELL
   OFFSHORE THROUGH PERIOD.  AIR MASS APPEARS TOO DRY AND/OR STABLE FOR
   TSTMS OVER CONUS.

   ..EDWARDS/COHEN.. 12/20/2014

   CLICK TO GET WUUS01 PTSDY1 PRODUCT

   NOTE: THE NEXT DAY 1 OUTLOOK IS SCHEDULED BY 1630Z

        
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Page last modified: December 20, 2014
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