Sunday, April 18, 2010

DAY2SVR: Nws Storm Prediction Center Norman Ok

ACUS02 KWNS 180506
SWODY2
SPC AC 180505

DAY 2 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
1205 AM CDT SUN APR 18 2010

VALID 191200Z - 201200Z

...NO SVR TSTM AREAS FORECAST...

...SYNOPSIS...
GENERAL LONG-WAVE RIDGING ALOFT WILL PREVAIL OVER MOST THE
CONUS...AS A TROUGH/LOW CONTINUES TO EXIT THE NORTHEAST AND A SECOND
DIGS SEWD FROM THE GULF OF AK TOWARD THE W COAST. WITHIN THE
LARGER-SCALE RIDGE HOWEVER...SEVERAL RELATIVELY WEAK/SMALL-SCALE
TROUGHS WILL AFFECT THE U.S. THIS PERIOD.

AT THE SURFACE...A COLD FRONT IS FORECAST TO MOVE ACROSS THE FAR WRN
U.S. AHEAD OF THE DIGGING UPPER TROUGH...WHILE WEAK LEE TROUGHING IS
EXPECTED ALONG THE HIGH PLAINS. ELSEWHERE...A LARGE AREA OF SURFACE
HIGH PRESSURE WILL PREVAIL OVER MOST OF THE CENTRAL AND ERN
CONUS...WITH THE EXCEPTION OF A WEAK SURFACE LOW INVOF S FL WHICH
SHOULD CONTRIBUTE TO SHOWERS AND A FEW THUNDERSTORMS ACROSS THIS
REGION.

...HIGH PLAINS FROM ERN WY/SWRN SD SWD INTO NERN NM...
A VERY WEAK MID-LEVEL SHORT-WAVE TROUGH CROSSING THE NRN AND CENTRAL
HIGH PLAINS REGION DURING THE AFTERNOON MAY SUPPORT SCATTERED TO
ISOLATED STORM DEVELOPMENT INVOF THE LEE TROUGH...AS MODEST
INSTABILITY /AROUND 500 J/KG MIXED-LAYER CAPE/ EVOLVES IN
CONJUNCTION WITH AFTERNOON HEATING.

WITH SLIGHTLY ENHANCED /NEAR 30 KT/ MID-LEVEL WNWLYS -- ASSOCIATED
WITH THE SUBTLE WAVE -- PROGGED TO SPREAD ATOP LOW-LEVEL
SELYS...SHEAR PROFILES SUGGEST THE POTENTIAL FOR A FEW
SUSTAINED/STRONGER CELLS THROUGH EARLY EVENING. THUS...WILL
INTRODUCE LOW PROBABILITY SEVERE AREA THIS FORECAST TO ACCOUNT FOR
THE POTENTIAL FOR ISOLATED WIND/HAIL.

..GOSS.. 04/18/2010

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