000
ACUS01 KWNS 120531
SWODY1
SPC AC 120528

DAY 1 CONVECTIVE OUTLOOK  
NWS STORM PREDICTION CENTER NORMAN OK
1228 AM CDT MON MAY 12 2008

VALID 121200Z - 131200Z

...NO SVR TSTM AREAS FORECAST...

...SYNOPSIS...
SLOWLY-PROGRESSIVE/AMPLIFYING UPPER PATTERN THIS PERIOD WILL FEATURE
A TROUGH/LOW SLOWLY VACATING THE MID-ATLANTIC REGION...WHILE A
SECOND TROUGH EXPANDS/DIGS SEWD ACROSS THE INTERMOUNTAIN WEST.

AT THE SURFACE...LOW ASSOCIATED WITH THE ERN UPPER FEATURE SHOULD
MOVE QUICKLY OFF THE MID-ATLANTIC COAST EARLY IN THE PERIOD. 
MEANWHILE...A COLD FRONT IS FORECAST TO MOVE SLOWLY ESEWD ACROSS THE
NRN PLAINS THROUGH THE DAY...AND THEN ON EWD/SEWD INTO THE CENTRAL
PLAINS THROUGH THE END OF THE PERIOD.  BY 13/12Z...THIS FRONT SHOULD
EXTEND FROM THE DAKOTAS/MN BORDER REGION SSWWD ACROSS ERN
NEB/CENTRAL KS AND INTO THE SRN HIGH PLAINS. 

...WRN NEB AND VICINITY...
LIMITED LOW-LEVEL MOISTURE -- AND THUS ONLY MARGINAL INSTABILITY --
IS FORECAST ACROSS THE CENTRAL HIGH PLAINS REGION.  WHILE THIS WILL
LIKELY LIMIT OVERALL CONVECTIVE COVERAGE...SEWD-MOVING COLD FRONT
SHOULD SERVE AS A FOCUS FOR ISOLATED/HIGH-BASED STORMS.  LOCALLY
GUSTY WINDS WOULD BE POSSIBLE WITH ANY STORM DOWNDRAFT...BUT THREAT
SHOULD REMAIN MINIMAL BEFORE ENDING OVERNIGHT.

...TX BIG BEND REGION...
WHILE BOUNDARY-LAYER MOISTURE IS FORECAST TO RETURN NWWD ACROSS THE
RIO GRANDE VALLEY OF TX...CAPPING INVERSION SHOULD HINDER CONVECTIVE
DEVELOPMENT THROUGH MOST OF THE DAY.  BY LATE AFTERNOON...AN
ISOLATED STORM OR TWO COULD FIRE OVER THE HIGHER TERRAIN OF TX/NRN
MEXICO...AND AFFECT THE BIG BEND REGION OF TX.  WHILE STORMS SHOULD
QUICKLY DIMINISH DURING THE EVENING WITH THE LOSS OF DAYTIME
HEATING...HAIL OR LOCALLY GUSTY WINDS WOULD BE POSSIBLE WITH ANY
STORM.

..GOSS/JEWELL.. 05/12/2008