SWODY1
SPC AC 171928
DAY 1 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0228 PM CDT WED MAR 17 2010
VALID 172000Z - 181200Z
...NO SVR TSTM AREAS FORECAST...
NO CHANGES FOR THE 20Z OUTLOOK.
..BROYLES.. 03/17/2010
.PREV DISCUSSION... /ISSUED 1058 AM CDT WED MAR 17 2010/
...SYNOPSIS...
MORNING WV IMAGERY SHOWED A SHORTWAVE TROF MOVING OUT OF WA STATE
AND INTO SWRN CANADA. ANOTHER SHORTWAVE TROF IS FORECAST TO DEVELOP
OVER THE PAC NW LATE THIS AFTERNOON AND MOVE SE TOWARD THE NRN GREAT
BASIN OVERNIGHT. FURTHER E ACROSS THE GULF COAST...UPPER LOW WILL
TRACK EWD ACROSS NRN FL/SRN GA THIS AFTERNOON AND INTO THE WRN
ATLANTIC OVERNIGHT. ONCE OFFSHORE OVER THE WARMER GULF STREAM
WATERS...THIS LOW WILL SERVE AS A FOCUS FOR THUNDERSTORM ACTIVITY
THROUGH THE OVERNIGHT HOURS WELL OFF THE NRN FL/GA AND CAROLINA
COASTS.
...NRN SIERRA NV MTNS AND FAR NWRN NV...
A WEAK SFC FRONTAL BOUNDARY FROM NRN CA TO NW NV INTO SW ID WILL
BECOME BETTER DEFINED THIS AFTERNOON AS A SHORTWAVE TROF DEVELOPS
FROM BRITISH COLUMBIA INTO THE PAC NW. STEEP LAPSE RATES COMBINED
WITH ADEQUATE DAYTIME HEATING WILL RESULT IN A COUPLE HUNDRED J/KG
MUCAPE. MODEST TERRAIN INDUCED ASCENT ALONG THE ERN SLOPES OF THE
SIERRA NV WILL AID IN ISOLATED THUNDERSTORM DEVELOPMENT THIS
AFTERNOON AND EVENING. THUNDERSTORMS MAY PUSH EWD INTO PORTIONS OF
FAR WRN NV THIS EVENING AS SHORTWAVE TROF TRACKS EWD.
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