SPC AC 011706
DAY 2 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
1106 AM CST SUN MAR 01 2009
VALID 021200Z - 031200Z
...NO SVR TSTM AREAS FORECAST...
...SYNOPSIS...
AN AMPLIFIED LARGE-SCALE PATTERN WILL PERSIST THROUGH THE DAY TWO
PERIOD...FEATURING STRONG TROUGHS ALONG THE EAST COAST AND OVER THE
FAR ERN PACIFIC. A SERIES OF VORTICITY MAXIMA WILL ROTATE THROUGH
THE ERN PACIFIC TROUGH ONTO THE WEST COAST...THE MOST NOTABLE OF
WHICH WILL LIFT NEWD THROUGH CA/NV INTO THE NRN INTERMOUNTAIN REGION
MONDAY AFTERNOON INTO MONDAY NIGHT. IN THE LOW LEVELS...A WEAK
SURFACE LOW AND PACIFIC FRONT WILL MOVE INTO THE INTERIOR PACIFIC NW
AND GREAT BASIN IN ASSOCIATION WITH ABOVE-MENTIONED MIDLEVEL
IMPULSE.
...SACRAMENTO VALLEY AND GREAT BASIN NWD INTO THE COLUMBIA
PLATEAU...
CONSIDERABLE STEEPENING OF MIDLEVEL LAPSE RATES IS FORECAST THROUGH
THE PERIOD IN RESPONSE TO HEIGHT FALLS/DYNAMIC COOLING ASSOCIATED
WITH PRIMARY SHORT WAVE TROUGH MOVING ONSHORE. WHEN COUPLED WITH
DAYTIME HEATING AND SOME LOW-LEVEL MOISTENING...AIR MASS WILL
DESTABILIZE THROUGH THE DIURNAL HEATING CYCLE WITH THE STRONGEST
INSTABILITY /SBCAPE AOB 200-400 J PER KG/ DEVELOPING IN THE
SACRAMENTO VALLEY AND ALONG THE COLUMBIA PLATEAU REGION.
TSTMS ARE EXPECTED TO INCREASE IN COVERAGE BY AFTERNOON AS
LARGE-SCALE FORCING ASSOCIATED WITH SHORT WAVE TROUGH BEGINS TO ACT
ON DESTABILIZING AIR MASS. INFLUENCE OF TERRAIN OVER THE SACRAMENTO
VALLEY WILL RESULT IN VERTICAL SHEAR PROFILES FAVORABLE FOR A FEW
ROTATING STORMS CAPABLE OF SOME HAIL AND PERHAPS A BRIEF TORNADO.
SIMILAR TYPE WIND PROFILES ARE ALSO FORECAST TO THE N ALONG THE
COLUMBIA PLATEAU WHERE BRIEF/MARGINAL SUPERCELL STRUCTURES ARE ALSO
POSSIBLE. THE MORE SUSTAINED/INTENSE STORMS WILL BE CAPABLE OF SOME
HAIL INTO MONDAY NIGHT.
..MEAD.. 03/01/2009
CLICK TO GET WUUS02 PTSDY2 PRODUCT
NOTE: THE NEXT DAY 2 OUTLOOK IS SCHEDULED BY 0700Z
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