Severe Storm Outlook Narrative (AC)
Issued by NWS

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000
ACUS01 KWNS 280455
SWODY1
SPC AC 280454

DAY 1 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
1054 PM CST FRI FEB 27 2015

VALID 281200Z - 011200Z

...NO SVR TSTM AREAS FORECAST...

...SUMMARY...
SCATTERED WEAK THUNDERSTORMS ARE POSSIBLE SATURDAY ACROSS PARTS OF
THE WEST...MAINLY FROM CENTRAL CALIFORNIA INTO THE GREAT BASIN AND
FOUR CORNERS STATES.

...SYNOPSIS...
A BROAD AREA OF SWLY FLOW ALOFT WILL EXTEND FROM SRN CA NEWD ACROSS
THE CONUS WITH TWO PRIMARY SHORTWAVE TROUGHS. ONE WILL BE LOCATED
OVER THE NRN PLAINS AND GREAT LAKES WITH LITTLE RELEVANCE TO
THUNDERSTORM FORMATION. THE MORE NOTABLE TROUGH WILL PIVOT SSEWD
ACROSS CA AND THE ERN PACIFIC...WITH GENERALLY COLD TEMPERATURES
ALOFT EXTENDING EWD ACROSS THE GREAT BASIN. HERE...DAYTIME HEATING
AS WELL AS TERRAIN EFFECTS WILL RESULT IN ISOLATED WEAK
THUNDERSTORMS MAINLY DURING THE DAY.

ELSEWHERE...ELY FLOW OFF THE ATLANTIC AROUND A LARGE SURFACE HIGH
WILL RESULT IN INCREASING LOW-LEVEL DEWPOINTS ACROSS FL WITH WEAK
INSTABILITY DEVELOPING. ALTHOUGH LAPSE RATES ALOFT WILL BE POOR AND
WITH DRY AIR...FULL HEATING MAY ALLOW A FEW OF THESE SHOWERS TO
BECOME DEEP ENOUGH TO PRODUCE SOME LIGHTNING ESPECIALLY ACROSS THE
SERN FL.

..JEWELL/PICCA.. 02/28/2015




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