SWODY1
SPC AC 191620
DAY 1 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
1120 AM CDT TUE MAY 19 2009
VALID 191630Z - 201200Z
...NO SVR TSTM AREAS FORECAST...
...NRN INTERMOUNTAIN WEST INTO THE NRN ROCKIES/HIGH PLAINS...
PRIMARY FEATURES OF INTEREST FOR DEEP MOIST CONVECTION CONTINUE TO
BE STRONG SHORTWAVE TROUGH DIGGING INTO THE PAC NW...AND SMALLER
SYSTEM NOW OVER CENTRAL NV ROTATING AROUND LARGE UPPER HIGH. PW/S
ACROSS THE REGION ARE SEASONABLY MARGINAL FOR THUNDERSTORMS...BUT
SHOULD STILL SUPPORT SCATTERED DIURNAL DEVELOPMENT.
STRONG SURFACE-H7 COLD FRONT SHOULD BE FOCUS FOR THUNDERSTORMS OVER
THE NRN ROCKIES OF ID/WRN MT DURING THE LATE AFTERNOON. ACTIVITY
SHOULD INCREASE IN COVERAGE/INTENSITY AS FRONT AND ASSOCIATED STORMS
SHIFT EWD THROUGH THE EVENING. LAPSE RATES WILL REMAIN QUITE STEEP
AND A FEW STORMS REMAIN CAPABLE OF ISOLATED DAMAGING
WINDS/HAIL...ALTHOUGH MARGINAL LOW LEVEL MOISTURE WILL LIMIT OVERALL
INSTABILITY AND UPDRAFT STRENGTH.
ADDITIONAL CLUSTER OF STRONG STORMS SHOULD BE FOCUSED AHEAD OF
SLOWER MOVING SYSTEM MOVING ACROSS THE GREAT BASIN. HERE A FEW
GUSTS MAY APPROACH SEVERE LEVELS WITH THE STRONGER CORES GIVEN THE
VERY WARM SURFACE CONDITIONS/STEEP LOW LEVEL LAPSE RATES.
..EVANS/HURLBUT.. 05/19/2009
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