SWODY3
SPC AC 080740
DAY 3 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0140 AM CST TUE DEC 08 2009
VALID 101200Z - 111200Z
...SYNOPSIS...
A BROAD CYCLONIC FLOW REGIME WILL BE MAINTAINED IN WAKE OF STRONG
VORTICITY MAXIMUM LIFTING NNEWD THROUGH THE CANADIAN MARITIMES.
MODEL GUIDANCE SUGGESTS THAT A LOW AMPLITUDE IMPULSE EMBEDDED WITHIN
SUBTROPICAL AIR STREAM WILL GRADUALLY WEAKEN WHILE TRANSLATING EWD
THROUGH THE LOWER CO VALLEY AND NRN BAJA INTO THE SRN PLAINS. AT
THE SURFACE...LARGE ANTICYCLONE INITIALLY CENTERED OVER THE S-CNTRL
CONUS WILL DEVELOP EWD INTO THE SERN STATES IN WAKE OF COLD FRONT
PUSHING SWD THROUGH THE SRN FL PENINSULA.
...S FL...
DIURNAL TSTMS WILL BE POSSIBLE ALONG SWD-MOVING COLD FRONT WITHIN A
MOIST BUT WEAK LAPSE RATE THERMODYNAMIC ENVIRONMENT. A FEW STRONG
STORMS WILL BE POSSIBLE...BUT THE MARGINAL CONVECTIVE INSTABILITY
AND ABSENCE OF ANY APPRECIABLE LARGE-SCALE FORCING SHOULD LIMIT THE
POTENTIAL FOR ORGANIZED...SEVERE STORMS.
...DEEP S TX AND LOWER COAST...
A FEW ELEVATED TSTMS WILL BE POSSIBLE LATE IN THE PERIOD AS
WAA/ISENTROPIC ASCENT INCREASES ACROSS REGION IN RESPONSE TO
APPROACH OF WEAKENING MIDLEVEL SYSTEM THROUGH THE SRN ROCKIES. NO
SEVERE WEATHER IS EXPECTED.
..MEAD.. 12/08/2009
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