SPC AC 151704
   
   DAY 2 CONVECTIVE OUTLOOK  
   NWS STORM PREDICTION CENTER NORMAN OK
   1204 PM CDT SUN MAR 15 2009
   
   VALID 161200Z - 171200Z
   
   ...NO SVR TSTM AREAS FORECAST...
   
   ...SYNOPSIS...
   WEAK POSITIVELY TILTED MID-LEVEL TROUGH WILL SHIFT EWD FROM THE
   LOWER/MID MS VALLEY REGION EWD TO THE ATLANTIC COASTAL STATES 
   DURING THIS FORECAST PERIOD. ZONAL FLOW WILL COVER THE CONUS BEHIND
   THIS SYSTEM...WHILE A SERIES OF SHORTWAVE IMPULSES...LOCATED WITHIN
   A LARGE TROUGH LOCATED OVER THE NERN PACIFIC/WRN CANADA...WILL EJECT
   NEWD ACROSS THE PACIFIC NW/NRN ROCKIES. AT THE SURFACE...A WEAK
   FRONT WILL MOVE SLOWLY SEWD ACROSS THE FL PENINSULA...WITH
   HIGH PRESSURE COVERING THE CENTRAL AND ERN PORTIONS OF THE CONUS
   BEHIND THE FRONT.
   
   ...SERN STATES...
   LARGE SCALE FORCING ASSOCIATED WITH WEAK UPPER TROUGH AND ISENTROPIC
   LIFT ABOVE SURFACE FRONT IS EXPECTED TO EXPAND AND SPREAD
   CONVECTION...CURRENTLY OVER PORTIONS OF THE NWRN GULF...NEWD INTO
   THE CENTRAL GULF STATES TONIGHT...AND THEN SHIFT EWD ACROSS THE
   REGION ON MON. DEEP SWLY FLOW ALOFT WILL RESULT IN CONTINUED WEAK
   LAPSE RATES. ALSO...SINCE THE UPDRAFT ROOTS ARE EXPECTED TO BE
   SITUATED ABOVE THE COOLER BOUNDARY LAYER...THREAT FOR ANY SEVERE
   THREAT APPEARS MINIMAL.
   
   ...PAC NW COAST...
   STRONGLY WLY ONSHORE FLOW WILL RESULT IN WIDESPREAD PRECIPITATION
   ACROSS THE NORTHWEST QUARTER PORTIONS OF THE COUNTRY ON MONDAY.
   WHILE INSTABILITY IS EXPECTED TO BE EXTREMELY WEAK...THE COMBINATION
   OF VERY STEEP LAPSE RATES FROM THE SURFACE TO 550 MB AND OROGRAPHIC
   LIFT MAY BE SUFFICIENT FOR A FEW LIGHTNING STRIKES. THE PRIMARY
   THREAT WILL BE LOCATED NEAR THE HIGHER TERRAIN OF COASTAL WA...WHERE
   500 MB TEMPERATURES WILL RANGE FROM -30C TO -35C.
   
   ..IMY.. 03/15/2009
   
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   NOTE: THE NEXT DAY 2 OUTLOOK IS SCHEDULED BY 0600Z