vendredi 4 avril 2014

Apr 4, 2014 1630 UTC Day 1 Convective Outlook,,,,,,,,,,,,,,,,,,,,,,,http://www.spc.noaa.gov/products/outlook/day1otlk.html

SPC AC 041616
   DAY 1 CONVECTIVE OUTLOOK  
   NWS STORM PREDICTION CENTER NORMAN OK
   1116 AM CDT FRI APR 04 2014

   VALID 041630Z - 051200Z

   ...THERE IS A SLGT RISK OF SVR TSTMS THIS AFTERNOON ACROSS A PART OF
   THE CNTRL GULF COAST...

   ...SYNOPSIS...

   AN INTENSE NEGATIVELY TITLED SHORT-WAVE TROUGH AND ASSOCIATED
   MIDLEVEL JET STREAK OVER THE UPPER MIDWEST INTO LOWER OH VALLEY WILL
   TRANSLATE NEWD INTO ERN ONTARIO/WRN QUEBEC AND LOWER GREAT LAKES BY
   05/12Z. ELSEWHERE...A SHORT-WAVE TROUGH WILL AMPLIFY OVER THE LOWER
   CO VALLEY INTO BAJA AND NWRN MEXICO.

   AT THE SURFACE...AN OCCLUDED LOW OVER CNTRL LAKE MI WILL DEVELOP
   NEWD INTO WRN QUEBEC WHILE A TRAILING COLD FRONT ADVANCES EWD
   THROUGH THE UPPER OH/TN VALLEYS AND CNTRL APPALACHIANS TO OFF THE
   MID ATLANTIC COAST BY DAYBREAK SATURDAY. THE COLD FRONT WILL
   PROGRESSIVELY OVERTAKE A WARM FRONT LIFTING NWD THROUGH THE MID
   ATLANTIC STATES WITH WEAK CYCLOGENESIS FORECAST AT THE INTERSECTION
   OF THESE TWO BOUNDARIES. MEANWHILE...THE TRAILING EXTENSION OF THE
   COLD FRONT WILL MOVE MORE SLOWLY EWD/SEWD THROUGH THE GULF COAST
   STATES AND SRN APPALACHIANS WITH THIS FEATURE LIKELY EXTENDING FROM
   THE TIDEWATER REGION SWWD THROUGH THE FL PNHDL TO THE NEAR-SHORE
   WATERS OFF THE SERN LA COAST BY THE END OF THE PERIOD.

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