SWODY1
SPC AC 171622
DAY 1 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
1022 AM CST MON DEC 17 2007
VALID 171630Z - 181200Z
..NO TSTM AREAS FORECAST...
A ZONAL FLOW PATTERN WILL REMAIN IN PLACE TODAY ACROSS THE CONUS
WITH A LOW-AMPLITUDE UPPER-LEVEL RIDGE LOCATED ACROSS THE PLAINS
STATES. AT THE SFC...HIGH PRESSURE WILL DOMINATE IN THE PLAINS...MS
VALLEY AND SRN APPALACHIANS. THE CENTER OF THE 1032 MB SFC HIGH IS
LOCATED ACROSS SRN LA AND THIS FEATURE SHOULD MOVE EWD TO THE SRN
ATLANTIC SEABOARD BY TONIGHT. THE HIGH WILL SUPPRESS MOISTURE RETURN
ACROSS THE CNTRL AND ERN U.S. AND THUNDERSTORMS ARE NOT EXPECTED
TODAY OR TONIGHT ACROSS THIS REGION.
ALONG THE WEST COAST...THE LATEST WATER VAPOR IMAGERY SHOWS A
LOW-AMPLITUDE SYNOPTIC SCALE UPPER-LEVEL TROUGH ORIENTED SSEWD FROM
BRITISH COLUMBIA ACROSS ERN WA...ERN ORE INTO NV. FORECAST SOUNDINGS
THIS AFTERNOON SHOW ENOUGH INSTABILITY FOR AN ISOLATED THUNDERSTORM
THREAT MAINLY OFF THE COAST OF WA. HOWEVER...THE STRONGEST
LARGE-SCALE ASCENT ASSOCIATED WITH THE UPPER-LEVEL TROUGH HAS
ALREADY MOVED INLAND. THIS COMBINED WITH DECREASING INSTABILITY
SHOULD KEEP THE THUNDER THREAT VERY ISOLATED THIS AFTERNOON AND
EVENING...AND A TEN PERCENT CONTOUR DOES NOT APPEAR WARRANTED EXCEPT
OFF THE COAST OF WA THIS AFTERNOON.
.BROYLES.. 12/17/2007
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