SWODY1
SPC AC 270521
DAY 1 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
1221 AM CDT FRI AUG 27 2010
VALID 271200Z - 281200Z
...NO SVR TSTM AREAS FORECAST...
...SYNOPSIS...
WRN U.S. UPPER TROUGH WILL UNDERGO AMPLIFICATION THIS PERIOD AS A
STRONG VORT MAX DROPS SSEWD INTO NRN CA. UPPER LOW NOW OVER AZ IS
EMBEDDED WITHIN WEAK FLOW ALOFT AND WILL DRIFT SLOWLY EAST. STRONG
SHORTWAVE TROUGH MOVING THROUGH NRN ROCKIES WILL EJECT NEWD INTO
S-CNTRL CANADA. THE ATTENDANT COLD FRONT WILL ADVANCE THROUGH THE
NRN PLAINS WITH TRAILING PORTIONS EXTENDING SWWD THROUGH THE CNTRL
ROCKIES...GREAT BASIN AND INTO NRN CA FRIDAY EVENING. UPPER TROUGH
OVER THE ERN U.S. WILL EXIT THE ATLANTIC SEABOARD LATER TODAY. AT
THE SURFACE A FRONT WILL REMAIN STALLED FROM SRN PARTS OF THE GULF
COASTAL STATES NEWD INTO COASTAL SC.
...SWRN STATES THROUGH THE GREAT BASIN AREA...
SUBTROPICAL MOISTURE PLUME WILL SHIFT SLOWLY EAST AS UPPER TROUGH
AMPLIFIES OVER THE WRN STATES AND RIDGE AXIS MOVES EWD. ATMOSPHERE
WILL BECOME MARGINALLY TO MODERATELY UNSTABLE FROM SRN CA THROUGH AZ
INTO THE GREAT BASIN AS DIABATIC WARMING COMMENCES. STRONGER
INSTABILITY WILL OCCUR ACROSS SRN CA INTO SRN AZ WHERE RICHER
MOISTURE HAS ADVECTED NWD FROM THE GULF OF CA. STORMS WILL ONCE
AGAIN DEVELOP ALONG TERRAIN FEATURES AND RESIDUAL BOUNDARIES AS THE
ATMOSPHERE DESTABILIZES. WEAK VERTICAL SHEAR WILL SUPPORT MULTICELL
AND PULSE STORMS...BUT INVERTED-V BOUNDARY LAYERS WILL PROMOTE A
THREAT OF ISOLATED DAMAGING WIND THROUGH EARLY EVENING.
..DIAL/GRAMS.. 08/27/2010
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