SPC AC 061637
DAY 2 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
1137 AM CDT FRI APR 06 2007
VALID 071200Z - 081200Z
...NO SVR TSTM AREAS FORECAST...
...SYNOPSIS...
AMPLIFIED LONG WAVE PATTERN WILL CONTINUE THROUGH THE DAY TWO
PERIOD...CHARACTERIZED BY BROAD TROUGH OVER ERN N AMERICA AND
RIDGING FROM THE PACIFIC NW INTO WRN CANADA. A LOWER LATITUDE TRAIN
OF SHORT WAVE TROUGHS WILL EXIST FROM THE ERN PACIFIC INTO S-CNTRL
STATES WHICH WILL PROVIDE THE FOCUS FOR ISOLATED TO SCATTERED TSTM
DEVELOPMENT THROUGH THE PERIOD.
...CA/GREAT BASIN THROUGH FOUR CORNERS REGION TO TX...
LEAD SHORT WAVE TROUGH INITIALLY OVER SRN AZ/SWRN NM AND NWRN MEXICO
WILL TEND TO WEAKEN AS IT TRANSLATES SEWD INTO INCREASINGLY
CONFLUENT MID-LEVEL FLOW REGIME OVER TX INTO THE LOWER MS VALLEY.
LOW-LEVEL AIR MASS WILL REMAIN DRY AND QUITE STABLE OWING TO
PROXIMITY OF SURFACE ANTICYCLONE OVER OK/N TX. HOWEVER...FORECAST
SOUNDINGS DO INDICATE THAT SUFFICIENT ELEVATED INSTABILITY WILL
EXIST SUCH THAT A FEW TSTMS WILL BE POSSIBLE THROUGH THE PERIOD
WITHIN ZONE OF LARGE-SCALE FORCING ASSOCIATED WITH THIS SHORT WAVE
TROUGH.
NEXT UPSTREAM SHORT WAVE TROUGH IS EXPECTED TO MOVE ONTO THE NRN CA
COAST SATURDAY MORNING WITH THIS FEATURE SHIFTING SEWD INTO THE
GREAT BASIN SATURDAY NIGHT. RELATIVELY COOL MID-LEVEL TEMPERATURES
AND ASSOCIATED PLUME OF STEEPER LAPSE RATES WILL SUPPORT
ISOLATED/SCATTERED TSTMS AHEAD OF THE UPPER TROUGH. OTHER MORE
ISOLATED TSTM DEVELOPMENT WILL BE POSSIBLE SATURDAY INTO SATURDAY
NIGHT WITHIN STEEP LAPSE RATE ENVIRONMENT FROM ERN PORTIONS OF THE
GREAT BASIN THROUGH THE FOUR CORNERS REGION.
..MEAD.. 04/06/2007
CLICK TO GET WUUS02 PTSDY2 PRODUCT
NOTE: THE NEXT DAY 2 OUTLOOK IS SCHEDULED BY 0800Z
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