SWODY1
SPC AC 170442
DAY 1 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
1142 PM CDT TUE MAR 16 2010
VALID 171200Z - 181200Z
...NO SVR TSTM AREAS FORECAST...
...SYNOPSIS...
LARGE-SCALE TROUGH OVER THE SERN QUARTER OF THE NATION WILL SLOWLY
SHIFT EWD OWING TO PROGRESSION OF ONE VORTICITY MAXIMUM ACROSS FL
AND THE SERN ATLANTIC COAST...AND ANOTHER SEWD THROUGH THE RED RIVER
VALLEY INTO N-CNTRL GULF OF MEXICO. ELSEWHERE...A STRONG SHORT WAVE
TROUGH CURRENTLY MOVING ONTO THE BRITISH COLUMBIA AND PACIFIC NW
COASTS WILL WEAKEN THROUGH THE PERIOD WHILE PROGRESSING EWD THROUGH
MEAN RIDGE AXIS IN PLACE E OF THE CANADIAN ROCKIES. IN ITS
WAKE...SEVERAL WEAK PERTURBATIONS ARE FORECAST TO MOVE INTO THE WRN
STATES FROM THE ERN PACIFIC.
...NRN GREAT BASIN INTO NRN SIERRA NEVADA RANGE...
TRAILING EXTENSION OF SURFACE FRONT ASSOCIATED WITH SHORT WAVE
TROUGH NOW MOVING THROUGH THE PACIFIC NW IS EXPECTED TO SLOWLY
PROGRESS SWD BEFORE BECOMING STATIONARY LATER TODAY OVER SRN PARTS
OF THE COLUMBIA PLATEAU AND NRN GREAT BASIN. WHILE MOISTURE WILL
REMAIN LIMITED WITH PW VALUES AOB 0.50 INCH...THE PRESENCE OF STEEP
MIDLEVEL LAPSE RATES AND DIABATIC HEATING WILL CONTRIBUTE TO POCKETS
OF WEAK CONVECTIVE INSTABILITY WHERE MUCAPE MAY APPROACH
500 J/KG.
CONVERGENCE ALONG THE SURFACE FRONT COUPLED WITH OROGRAPHIC FORCING
AND THE INFLUENCE OF WEAK IMPULSES MOVING ONSHORE FROM THE PACIFIC
MAY FOSTER ISOLATED TSTMS LATER THIS AFTERNOON INTO EVENING. ANY
STORMS THAT DEVELOP SHOULD DISSIPATE AFTER 18/03-04Z OWING TO THE
COOLING AND STABILIZATION OF THE BOUNDARY LAYER.
..MEAD/HURLBUT.. 03/17/2010
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