DAY2SVR: Nws Storm Prediction Center Norman Ok

ACUS02 KWNS 291641
SWODY2
SPC AC 291639

DAY 2 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
1039 AM CST THU NOV 29 2012

VALID 301200Z - 011200Z

...NO SVR TSTM AREAS FORECAST...

...NRN CA TO WA COAST...
ANOTHER SERIES OF SHORTWAVE IMPULSES WILL IMPACT THE PACIFIC
NORTHWEST ON FRIDAY. THE FIRST IMPULSE WILL BE MOVING ONSHORE AT THE
BEGINNING OF THE PERIOD WHILE THE SECOND APPROACHES LATER IN THE
EVENING/OVERNIGHT. STEEPENING MIDLEVEL LAPSE RATES WILL LEAD TO WEAK
DESTABILIZATION AND COLD TEMPERATURES ALOFT SHOULD SUPPORT AT LEAST
A FEW LIGHTNING STRIKES ALONG/NEAR THE COAST AND ADJACENT OFFSHORE
WATERS AS FRONTAL BANDS OF PRECIPITATION MOVE INLAND FROM WA TO NRN
CA DURING THE EARLY MORNING AND AGAIN LATER IN THE EVENING. A
LIGHTNING STRIKE OR TWO ALSO MAY BE POSSIBLE FURTHER INLAND NEAR
HIGHER TERRAIN WHERE MOIST...UPSLOPE FLOW MAY COMPENSATE FOR LIMITED
INSTABILITY BUT COVERAGE SHOULD REMAIN LOWER THAN 10 PERCENT...
PRECLUDING AN EWD ADJUSTMENT TO THE GENERAL THUNDER LINE.

...S TX...
MOISTURE WILL BEGIN TO SURGE NWD FROM SRN/CNTRL TX ACROSS THE SRN
PLAINS IN RESPONSE TO INCREASING SLY FLOW AHEAD OF CNTRL ROCKIES LEE
TROUGH. WHILE MODELS CONTINUE TO INDICATE SOME SFC BASED INSTABILITY
ACROSS S TX /AROUND 1000-1500 J PER KG/...LACK OF FORCING FOR ASCENT
AND WEAK MIDLEVEL LAPSE RATES SHOULD LIMIT STORM COVERAGE AND SEVERE
POTENTIAL OVER FAR S TX AND ADJACENT GULF WATERS.

..LEITMAN/PETERS.. 11/29/2012

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