SWODY1
SPC AC 180540
DAY 1 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
1140 PM CST FRI DEC 17 2010
VALID 181200Z - 191200Z
...NO SVR TSTM AREAS FORECAST...
...SYNOPSIS...
HIGH-LATITUDE BLOCKING PATTERN EXPECTED TO CONTINUE AND NO
APPRECIABLE CHANGES ARE EXPECTED THROUGH SATURDAY. POLAR STREAM
WILL FEATURE A RETROGRADING VORTEX ACROSS ERN/CNTRL CANADA AND A
NEARLY STATIONARY CYCLONE WEST OF WA. A LOWER-AMPLITUDE SRN STREAM
WAVE WILL CONTINUE EWD THROUGH THE SRN STATES AND EJECT ENE TOWARD
THE ERN SEABOARD BY SUNDAY MORNING.
...COASTAL ORE/NRN CA...
MOIST AND UNSTABLE ONSHORE FLOW WILL EVOLVE IN WAKE OF A LEAD
SHORTWAVE IMPULSE ROTATING NWD INTO WA SATURDAY MORNING/AFTERNOON.
STEEPENING MID-LEVEL LAPSE RATES WILL RESULT IN SUFFICIENT BUOYANCY
TO SUPPORT SPORADIC THUNDERSTORMS MAINLY THROUGH MID-AFTERNOON.
STRONG DEEP-LAYER WIND FIELDS WILL EXIST WITH LOCALIZED LOW-LEVEL
TURNING IN VICINITY OF THE COASTAL RANGES. THEREFORE...A NON-ZERO
THREAT WILL EXIST FOR AN ISOLATED AND BRIEF STRONG STORM CAPABLE OF
A SMALL TORNADO AND/OR GUSTY WINDS AND PERHAPS SMALL HAIL.
...SRN FL...
COLD FRONT WILL SETTLE SWD THROUGH FL ON SATURDAY. PRE-FRONTAL AIR
MASS WILL GRADUALLY MOISTEN/DESTABILIZE DURING THE DAY...BUT WEAK
TROPOSPHERIC LAPSE RATES WILL TEND TO LIMIT OVERALL INSTABILITY.
STRONGER THUNDERSTORMS WILL DEVELOP OVER THE GULF STREAM AND LOOP
CURRENTS. HOWEVER...AN ISOLATED STRONG STORM COULD EVOLVE ALONG THE
ECNTRL/SERN COAST NEAR SEABREEZES AND AMIDST MORE ROBUST HEATING.
..RACY/SMITH.. 12/18/2010
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