000
ACUS02 KWNS 250536
SWODY2
SPC AC 250535

DAY 2 CONVECTIVE OUTLOOK  
NWS STORM PREDICTION CENTER NORMAN OK
1135 PM CST TUE NOV 24 2009

VALID 261200Z - 271200Z

...NO SVR TSTM AREAS FORECAST...

...SYNOPSIS...
THANKSGIVING WEATHER INTEREST WILL BE ON THE EVOLUTION OF A
DEEP/COLD TROUGH OVER THE ERN PARTS OF THE COUNTRY.  THIS TROUGH
WILL BECOME NEGATIVELY-TILTED OVER THE UPR OH VLY THURSDAY AFTN AND
THEN TRANSLATE ENE INTO THE MID-ATLC REGION...ACCOMPANIED BY
180-METER/12-HR HEIGHT FALLS.  NWLY FLOW IN WAKE OF THE SYSTEM WILL
FORCE A CDFNT WELL S INTO THE GULF OF MEXICO AND FL STRAITS BY
THURSDAY NIGHT.

UPSTREAM...A NEW UPR TROUGH WILL ARRIVE ONSHORE THE PAC NW WHILE A
SUB-TROPICAL DISTURBANCE MIGRATES OVER NRN MEXICO. 

...MID-ATLC REGION...
STRONG PV-ANOMALY AND MID-LVL LAPSE RATES APCHG 7 DEG C PER KM WILL
ACCOMPANY THE TROUGH TRANSITION TO NEGATIVE-TILT ACROSS PARTS OF THE
REGION THURSDAY AFTN/NIGHT.  FCST SOUNDINGS EXHIBIT A FEW HOURS OF
SMALL ELEVATED CAPE...AND GIVEN SUCH STRONG UVV EXPECTED...SPORADIC
BURSTS OF LIGHTNING WILL LIKELY OCCUR.  

...CSTL PAC NW...
STEEPENING LAPSE RATES IN THE MOIST...POST-FRONTAL REGIME WILL BE
FAVORABLE FOR SHOWERS THURSDAY NIGHT ACROSS THE REGION.  MID-LVL
TEMPERATURES ACCOMPANYING THE UPR TROUGH APPROACH MINUS 30 DEG C AND
CLOUD-TOPS WILL PROBABLY BE SUFFICIENTLY HIGH TO PRODUCE LIGHTNING.

..RACY.. 11/25/2009