SWODY1
SPC AC 161618
DAY 1 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
1018 AM CST WED FEB 16 2011
VALID 161630Z - 171200Z
...NO SVR TSTM AREAS FORECAST...
...NORTHERN CA...
A LARGE UPPER TROUGH IS MOVING ASHORE OVER NORTHERN CA THIS
MORNING...WITH THE PRIMARY FRONTAL BAND MOVING ACROSS THE
NORTHERN/CENTRAL SIERRAS AND CENTRAL VALLEY. COLD MID LEVEL
TEMPERATURES AND STEEP LAPSE RATES ARE SPREADING INLAND AND WILL BE
IN PLACE ACROSS MUCH OF THE NORTHERN AND CENTRAL INTERIOR VALLEY BY
AFTERNOON. FORECAST SOUNDINGS IN THIS REGION SHOW FAVORABLE
THERMODYNAMIC PROFILES FOR A RISK OF HAIL IN STRONGER SHOWERS AND
THUNDERSTORMS THIS AFTERNOON AND EVENING. LOW LEVEL VERTICAL SHEAR
IS ALSO SUPPORTIVE FOR UPDRAFT ROTATION AND A BRIEF TORNADO...
ESPECIALLY IN TERRAIN-FAVORED AREAS.
...NV/UT...
THE PRIMARY FRONTAL BAND WILL PROGRESS EASTWARD ACROSS THE GREAT
BASIN THIS AFTERNOON AND BEGIN AFFECTING EASTERN NV AND MUCH OF UT
THIS EVENING. STRONG LARGE SCALE FORCING ALONG THE FRONT...COUPLED
WITH MARGINAL INSTABILITY WILL A BROKEN LINE OF SHOWERS AND ISOLATED
THUNDERSTORMS. A COMBINATION OF STEEP LOW LEVEL LAPSE
RATES...STRONG SOUTHWESTERLY ENVIRONMENTAL WINDS JUST ABOVE THE
SURFACE...AND SUFFICIENT CAPE WILL PROMOTE A RISK OF LOCALLY
GUSTY/DAMAGING WINDS WITH CONVECTION ALONG THE FRONT.
..HART/GRAMS.. 02/16/2011
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