SWODY2
SPC AC 070559
DAY 2 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
1259 AM CDT TUE APR 07 2009
VALID 081200Z - 091200Z
...NO SVR TSTM AREAS FORECAST...
...SYNOPSIS...
AMPLIFIED FLOW REGIME WILL CONTINUE ON WEDNESDAY. ERN STATES UPR
TROUGH WILL BE REINFORCED DURING THE DAY AS A SPEED MAX QUICKLY
DROPS SEWD FROM THE CANADIAN PRAIRIES INTO THE OH VLY.
MEANWHILE...UPR LOW CURRENTLY IN THE E PAC BASIN...WILL ARRIVE IN CA
BY 12Z WEDNESDAY...THEN QUICKLY MOVE EWD ACROSS THE INTERIOR WEST ON
WEDNESDAY NIGHT.
...CNTRL/SRN CA...
COLD TEMPERATURES ALOFT /AOB MINUS 25 DEG C AT H5/ ASSOCD WITH THE
UPR LOW WILL LINGER ACROSS CNTRL/SRN CA THROUGH EARLY WEDNESDAY AFTN
BEFORE TRANSLATING INTO THE INTERIOR WEST LATER IN THE DAY. ISOLD
TSTMS MAY BE ONGOING AT 12Z WEDNESDAY ALONG THE CNTRL/SRN CA CSTS.
ADDITIONAL STORMS COULD FORM IN THE INTERIOR VLYS DURING THE AFTN.
LOW WBZ LEVELS MAY YIELD SMALL HAIL IN THE STRONGEST STORMS...BUT
SVR THREATS WILL REMAIN LOW.
...INTERIOR WEST...
HEIGHTS WILL BEGIN TO FALL ACROSS THE INTERIOR WEST ON WEDNESDAY AS
THE UPR LOW BEGINS TO ACCELERATE OUT OF CA. SUFFICIENT MOISTENING
AND STEEP LAPSE RATES WILL CONTRIBUTE TO DIURNALLY-ENHANCED TSTM
THREAT FROM NEAR THE CANADIAN BORDER SWD TO THE FOUR-CORNERS REGION.
HIGHEST POTENTIAL FOR TSTMS WILL BE ACROSS ERN ID...NRN UT...SWRN WY
AND NWRN CO ALONG THE EXIT REGION OF THE MID-LVL JET. A SECONDARY
MAXIMUM IN PROBABILITIES WILL SPREAD ACROSS NRN AZ INTO NWRN NM
DURING THE EVENING...ALONG THE TRACK OF COLDEST TEMPERATURES ALOFT.
...OH VLY...
SPORADIC TSTMS WILL LIKELY ACCOMPANY THE CLIPPER-TYPE SYSTEM DIGGING
INTO THE OH VLY WEDNESDAY AFTN/EVE. HERE...MODEST UVV/S COMBINED
WITH A STEEP LAPSE RATE ENVIRONMENT WILL CONTRIBUTE TO A FEW HOURS
OF POSITIVE BUOYANCY AND POTENTIAL CB TOPS INTO THE ICING RANGE OF
MINUS 20 DEG C.
..RACY.. 04/07/2009
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