[SWODY1] SWODY1

[Severe Weather Outlook Day 1]

ACUS01 KWNS 121610
SWODY1
SPC AC 121608

DAY 1 CONVECTIVE OUTLOOK  
NWS STORM PREDICTION CENTER NORMAN OK
1108 AM CDT FRI MAY 12 2006

VALID 121630Z - 131200Z

...NO SVR TSTM AREAS FORECAST...

LARGE AND UNSEASONABLY COOL SURFACE AND UPPER AIR CYCLONE WESTERN
GREAT LAKES CONTINUES TO DOMINATE THE EASTERN TWO-THIRDS OF THE
CONUS. COLD FRONT CURRENTLY PASSING THRU S FL WITH A RELATIVELY
STABLE AIR MASS IN ITS WAKE OVER MUCH OF THE COUNTRY E OF ROCKIES.

A WEAK TROUGH IN THE WSWLY FLOW ACROSS PAC NW AND NRN ROCKIES WILL
PROVIDE SOME SUPPORT FOR HIGH BASED CONVECTION THIS AFTERNOON AND
EVENING NRN ROCKIES.  WHILE MOISTURE IS LIMITED THE STEEP LAPSE
RATES IN PLACE AND STRONG HEATING WILL BE SUFFICIENT FOR A FEW
THUNDERSTORMS ACROSS CENTRAL/ERN MT.

AS PRESSURES FALL SRN HIGH PLAINS AND LOW LEVEL FLOW BACKS TO SLY
ACROSS TX...SOME LOW LEVEL MOISTURE WILL BEGIN
RETURNING...PARTICULARLY TONIGHT.  WARM ADVECTION IN CONJUNCTION
WITH EXPECTED STEEP LAPSE RATES COULD LEAD TO A FEW THUNDERSTORMS
DEVELOPING MAINLY AFTER 06Z PARTS OF THE LOWER MS VALLEY.

..HALES/GRAMS.. 05/12/2006