DAY3SVR: Nws Storm Prediction Center Norman Ok

ACUS03 KWNS 290849
SWODY3
SPC AC 290847

DAY 3 CONVECTIVE OUTLOOK RESENT 1
NWS STORM PREDICTION CENTER NORMAN OK
0347 AM CDT FRI MAR 29 2013

VALID 311200Z - 011200Z

...NO SVR TSTM AREAS FORECAST...

...SYNOPSIS...
A LARGE UPPER VORTEX WILL REMAIN NEARLY STATIONARY ACROSS ONTARIO
WITH CYCLONIC FLOW ALOFT FROM THE PLAINS EWD. SLY SURFACE FLOW
AROUND A WRN ATLANTIC HIGH WILL HELP MAINTAIN POCKETS OF MID TO
UPPER 50S F DEWPOINTS ACROSS THE GULF COAST...LOWER MS VALLEY AND
SRN PLAINS THROUGH THE PERIOD WITH WEAK LOW PRESSURE ACROSS W TX.

AREAS OF RAIN AND STORMS ARE EXPECTED TO BE ONGOING ACROSS PORTIONS
OF OK...NERN TX AND AR SUNDAY MORNING WITH WEAK WARM ADVECTION
HELPING TO MAINTAIN SCATTERED STORM DEVELOPMENT NEAR OUTFLOW
BOUNDARIES FROM PREVIOUS NIGHTS CONVECTION.

...CNTRL TX...
STRONG HEATING WILL EXIST ACROSS WRN AND CNTRL TX BUT IT WILL BE
RELATIVELY DRY WITH DEWPOINTS MIXING INTO THE 40S. STILL...DEEP
LAYER TROPOSPHERIC LAPSE RATES WILL BE VERY STEEP...CREATING
MARGINAL INSTABILITY DURING THE AFTERNOON. WEAK CONVERGENCE SHOULD
BE SUFFICIENT FOR AT LEAST ISOLATED STORMS. INCREASING WLY FLOW WITH
HEIGHT WILL FAVOR SOME DEGREE OF STORM ORGANIZATION. HAIL MAY OCCUR
WITH A FEW STORMS AS THEY ENCOUNTER GREATER MOISTURE TO THE E.

WRN EDGE OF OUTFLOW FROM EARLIER CONVECTION MAY AID IN FOCUSING
DAYTIME DEVELOPMENT OVER NRN/NERN TX...BUT MAY ALSO INHIBIT AREAL
EXTENT IF AIR IS TOO STABLE OR SURGES TOO QUICKLY.

..JEWELL.. 03/29/2013

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