SWODY1
SPC AC 090042
DAY 1 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0742 PM CDT WED APR 08 2009
VALID 090100Z - 091200Z
...NO SVR TSTM AREAS FORECAST...
...GREAT BASIN/ROCKIES...
DESPITE RATHER LOW MOISTURE CONTENT TO THE AIR MASS...SURFACE
HEATING ACROSS THE HIGHER TERRAIN...BENEATH RELATIVELY COOL AIR
ALOFT...HAS CONTRIBUTED STEEP LAPSE RATES AND WEAK CONDITIONAL
INSTABILITY ACROSS A LARGE PORTION OF THE INTERMOUNTAIN WEST AND
ROCKIES. SCATTERED THUNDERSTORM ACTIVITY HAS PRIMARILY BEEN
CONFINED TO A ZONE OF STRONGER LIFT/COOLING IN THE LEFT EXIT REGION
OF A WEAKENING MID-LEVEL JET...NOW NOSING NORTH NORTHEASTWARD ACROSS
THE COLORADO/WYOMING ROCKIES.
MUCH OF THE ACTIVITY WEST OF THE CONTINENTAL DIVIDE SEEMS LIKELY TO
DIMINISH SHORTLY AFTER SUNSET WITH THE LOSS OF DAYTIME HEATING. TO
THE EAST OF THE MID-LEVEL CIRCULATION ACCOMPANYING THE JET
STREAK...FORCING MAY BE SUFFICIENT TO MAINTAIN SCATTERED WEAK HIGH
BASED STORMS TO THE LEE OF THE WYOMING ROCKIES INTO THE EVENING
HOURS. HOWEVER...EVEN THIS ACTIVITY LIKELY WILL DIMINISH BY
02-04Z...AS THE FORCING SPREADS INTO A PROGRESSIVELY COOLER
LOW-LEVEL ENVIRONMENT ACROSS THE NORTH CENTRAL HIGH PLAINS...AND THE
ENVIRONMENT IN CLOSER PROXIMITY TO THE HIGHER TERRAIN COOLS WITH THE
LOSS OF DAYTIME HEATING.
STRENGTHENING FORCING ASSOCIATED WITH AN INTENSIFYING MID-LEVEL JET
STREAK AND ASSOCIATED IMPULSE...PROGGED TO NOSE EASTWARD THROUGH THE
FOUR CORNERS REGION LATE THIS EVENING INTO THE OVERNIGHT HOURS
...WILL CONTRIBUTE TO INCREASING CONVECTIVE POTENTIAL ACROSS PARTS
OF THE CENTRAL/SOUTHERN ROCKIES. HOWEVER...DUE TO THE LACK OF MORE
FAVORABLE MOISTURE...ANY THUNDERSTORM ACTIVITY WILL LIKELY BE SPARSE
IN COVERAGE.
..KERR.. 04/09/2009
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