SWODY1
SPC AC 081941
DAY 1 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0141 PM CST SUN NOV 08 2009
VALID 082000Z - 091200Z
...NO SVR TSTM AREAS FORECAST...
...SYNOPSIS...
LITTLE CHANGE TO THE ONGOING FORECAST THIS UPDATE...WITH THUNDER
ONGOING IN SPOTS ACROSS THE COASTAL PAC NW REGION...AS WELL AS OVER
PORTIONS OF CENTRAL AND S TX. IN ADDITION...POTENTIAL FOR
SHOWER/ISOLATED STORM DEVELOPMENT REMAINS APPARENT ACROSS PARTS OF
KS/OK LATER TONIGHT...LOW-LEVEL WARM ADVECTION INCREASES INVOF A
WEAK SURFACE FRONT OVER THE CENTRAL PLAINS. IN ALL AREAS...SEVERE
WEATHER IS NOT EXPECTED.
..GOSS.. 11/08/2009
.PREV DISCUSSION... /ISSUED 1004 AM CST SUN NOV 08 2009/
...SOUTH TX...
A LARGE UPPER TROUGH IS SLOWLY DEEPENING OVER THE EASTERN PACIFIC
TODAY...WHILE AN UPPER RIDGE REMAINS OVER THE SOUTHEAST STATES.
MORNING WATER VAPOR IMAGERY SHOWS A POTENT SOUTHERN STREAM SHORTWAVE
TROUGH MOVING ACROSS NORTHERN MEXICO. THIS FEATURE HAS RESULTED IN
SCATTERED SHOWERS AND THUNDERSTORMS OVER SOUTH TX...AND WILL LIKELY
CONTINUE TO DO SO THROUGHOUT THE DAY. WEAK LAPSE RATES AND MINIMAL
VERTICAL SHEAR WILL PRECLUDE ORGANIZED SEVERE STORMS.
...KS/OK...
ANOTHER UPPER TROUGH IS MOVING ACROSS THE CENTRAL ROCKIES AND WILL
EMERGE ONTO THE PLAINS THIS AFTERNOON AND EVENING. A FEW SHOWERS
AND THUNDERSTORMS ARE EXPECTED TO FORM ALONG A WEAK SURFACE BOUNDARY
EXTENDING ACROSS KS AND NORTHWEST OK...MAINLY AFTER MIDNIGHT.
...WESTERN WA/ORE...
A PERSISTENT STREAM OF STRONG WESTERLY ONSHORE FLOW WILL BE
MAINTAINED ALONG THE PACIFIC NORTHWEST COAST DURING THIS PERIOD.
EMBEDDED IMPULSES WILL PROMOTE ISOLATED LIGHTNING STRIKES NEAR THE
COAST AND COASTAL RANGES TODAY AND AGAIN LATE TONIGHT.
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