National Weather Service Weather Forecast Office

Severe Storm Outlook Narrative (ac)

000
ACUS02 KWNS 260542
SWODY2
SPC AC 260541

DAY 2 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
1141 PM CST WED NOV 25 2009

VALID 271200Z - 281200Z

...NO SVR TSTM AREAS FORECAST...

...SYNOPSIS...
STRONG UPR LOW CURRENTLY MOVING ACROSS THE MIDWEST WILL MIGRATE ENE
INTO THE LWR GRTLKS BY EARLY FRIDAY...THEN TURN ESE ACROSS SRN NEW
ENG/NRN MID-ATLC CSTL STATES BY EARLY SATURDAY.  ASSOCD TROUGH WILL
TRANSLATE OFFSHORE DURING THE DAY FRIDAY.  UPSTREAM...AN UPR IMPULSE
SEVERAL HUNDRED MILES OFF THE WA CST WILL CONTINUE EWD...WITH
SPLITTING FLOW REGIME EXPECTED THIS WEEKEND.  A STRONG JET WILL DIG
SEWD AND CLOSE INTO A LOW OVER SRN CA BY 12Z SATURDAY.  NRN STREAM
ENERGY WILL CONTINUE EWD TO THE NRN ROCKIES.  MEANWHILE...TO THE
S...A WEAK SUB-TROPICAL IMPULSE WILL EJECT EWD ACROSS THE SRN PLNS
AHEAD OF THE CA TROUGH.

...CSTL MA/GULF OF MAINE...
UPR TROUGH WILL ACHIEVE A STRONG NEGATIVE-TILT OFF THE MD/NJ CSTS
EARLY FRIDAY...WITH THE PV-ANOMALY MOVING NEAR/JUST E OF LONG
ISLAND/SERN MA AND THE GULF OF MAINE FRIDAY AFTN.  FCST SOUNDINGS
EXHIBIT A NARROW SLIVER OF MUCAPE WHERE H7-H5 LAPSE RATES WILL
EXCEED 7 DEG C PER KM.  THIS SHOULD BE FAVORABLE FOR A BURST OF
LIGHTNING SOMETIME LATE THURSDAY NIGHT INTO FRIDAY MORNING OVER
PARTS OF SERN MA AND THE GULF OF MAINE.  NO SVR WEATHER IS EXPECTED.


...CSTL CNTRL CA...
UPR TROUGH WILL LIKELY CLOSE INTO A LOW AS IT APCHS THE KSFO REGION
FRIDAY AFTN.  STEEPENING LAPSE RATES COINCIDENT WITH MOISTENING
ONSHORE FLOW AND STRONG UVV MAY CONTRIBUTE TO A FEW TSTMS...BOTH
CONTAINED WITHIN THE ASSOCD FRONTAL BAND AND IN THE POST-FRONTAL AIR
MASS.

..RACY.. 11/26/2009