Severe Thunderstorm Warning 28, NWS Norman, OK

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORMAN OK
1015 AM CST SAT MAR 11 2006

SCATTERED STORMS DEVELOPED QUICKLY THIS MORNING OVER NORTH CENTRAL
TEXAS DUE TO ENHANCED ASCENT ON THE WESTERN PERIPHERY OF THE LOW
LEVEL JET AND NEAR THE DRYLINE. RADAR SUGGESTS HIGH BASED
DEVELOPMENT WITH LITTLE RISK OF SEVERE AT THIS TIME. THE DRYLINE
ADVANCED NORTHWARD VERY QUICKLY OVERNIGHT AND CURRENTLY EXTENDS FROM
WAURIKA TO OKLAHOMA CITY AND STILLWATER...WHERE THE DRYLINE THEN
INTERSECTS A WEAK COLD FRONT THAT EXTENDS WESTWARD FROM STILLWATER...TO
NEAR OKLAHOMA CITY AND HOBART. PRESSURE GRADIENT AND THUS
CONVERGENCE ALONG BOTH BOUNDARIES REMAIN VERY WEAK WITH WINDS
LIKELY BECOMING VARIABLE NEAR THE BOUNDARIES AT SOME POINT THIS
AFTERNOON.

ALTHOUGH STORMS APPEAR POORLY ORGANIZED AT THIS TIME...MORE
ORGANIZED DEVELOPMENT IS EXPECTED THIS AFTERNOON AS THE ATMOSPHERE
DESTABILIZES FURTHER AND STORMS POTENTIALLY DEVELOP CLOSER TO THE
SURFACE. THE DRYLINE IS FORECAST TO MOVE ONLY SLIGHTLY EASTWARD THIS
AFTERNOON WITH THE COLD FRONT MOVING SOUTH OF OKLAHOMA CITY BEFORE
STALLING...WHICH KEEPS SOUTH CENTRAL AND SOUTHEAST OKLAHOMA IN THE
WARM SECTOR. MODIFIED RUC SOUNDINGS FOR FORECAST CONDITIONS THIS
AFTERNOON SUGGEST MLCAPES OF 1300-2000 WITH DEEP LAYER SHEAR OF 50
TO 70 KTS...WHICH WILL BE MORE THAN ADEQUATE FOR SUPERCELLS. THE
HAZARDOUS WEATHER OUTLOOK WAS UPDATED EARLIER TO REFLECT SUPERCELL
DEVELOPMENT...POSSIBLY AS EARLY AS 1 OR 2 PM...AS INSOLATION QUICKLY
OVERCOMES A LARGE AND SHALLOW NOCTURNAL INVERSION NEAR THE DRYLINE.

OTHERWISE...TEMPERATURES BEHIND THE COLD FRONT ARE STRUGGLING TO GET
OUT OF THE 40S AND 50S OVER NORTHWEST OKLAHOMA WITH CONSTANT
MID/HIGH CLOUD DEVELOPMENT FORMING TO THE REAR OF AN UPPER
JET...REDUCING HEATING. WITH LIGHT WINDS PREVAILING OVER ALL BUT
SOUTHEAST OKLAHOMA TODAY...RED FLAG WARNING CONDITIONS ARE NOT
ANTICIPATED OVER ABOUT THE NORTHERN THIRD OF OKLAHOMA....WHERE HIGHS
WILL LIKELY REMAIN THE 60S. HUMIDITIES WILL STILL BE QUITE LOW
HOWEVER BUT SHOULD BE A LITTLE HIGHER THAN FORECAST DUE TO COOLER
TEMPERATURES. WILL THEREFORE BE CANCELING THE RED FLAG WARNING FOR
PORTIONS OF NORTHERN OKLAHOMA.

EXTREME FIRE DANGER APPEARS ON TRACK FOR SUNDAY AS THE DRYLINE
PUSHES ALMOST COMPLETELY EAST OF THE AREA AND A DEEPLY MIXED
BOUNDARY LAYER CONNECTS WITH STEEP MID LEVEL LAPSE RATES. WESTERLY
FLOW OF AT LEAST 15 TO 25 KTS WITH GUSTS IN THE MID 30S SEEMS LIKELY
WITH EVEN STRONGER WINDS POSSIBLY DEVELOPING...ESPECIALLY OVER
NORTHERN OKLAHOMA. FIRE WEATHER WATCH REMAINS IN EFFECT FOR ALL
AREAS SUNDAY WITH AN UPGRADE TO A RED FLAG WARNING POSSIBLE LATER
TODAY.

JAMES

--------------------------
637 AM CST SAT MAR 11 2006

.UPDATE...
BAND OF FOG REDUCING VISIBILITIES TO ONE MILE OR LESS HAS FORMED
OVER PORTIONS OF CENTRAL OKLAHOMA... IN RESPONSE TO HIGHER
DEWPOINT AIR MOVING OVER GROUND THAT HAD COOLED OVERNIGHT. BELIEVE
FOG AND STRATUS SHOULD MIX OUT RELATIVELY QUICKLY THIS MORNING AS
LOW LEVEL WINDS BEGIN TO VEER AND THE DRYLINE STARTS MOVING BACK
TO THE EAST.

&&

.PREV DISCUSSION... (ISSUED 318 AM CST SAT MAR 11 2006)

DISCUSSION...
UNSEASONABLY WARM WEATHER WILL PERSIST THROUGH THE WEEKEND AS
HIGH TEMPERATURES AVERAGE AROUND 20 DEGREES ABOVE NORMAL.
MEANWHILE... LOW LEVEL MOISTURE... IN THE FORM OF 50 AND 60 DEGREE
DEWPOINTS... CONTINUES TO SPREAD NORTHWEST INTO PORTIONS OF
CENTRAL AND SOUTHEAST OKLAHOMA EARLY THIS MORNING. WE EXPECT THE
MOISTURE TO BE SHUNTED BACK TO THE EAST TODAY AS THE DRYLINE MIXES
EAST. BEHIND THE DRYLINE... VERY HIGH TO EXTREME FIRE CONDITIONS
ARE EXPECTED DUE TO LOW HUMIDITIES AND WARM TEMPERATURES. WINDS
WILL BE MODERATE... INCREASING IN THE AFTERNOON TO 15 TO 20 MPH...
WITH OCCASIONAL GUSTS NEAR 25 POSSIBLE IN THE WEST. A FEW
THUNDERSTORMS MAY OCCUR AGAIN IN SOUTHEAST OKLAHOMA THIS
AFTERNOON AND EVENING... DEPENDING ON EXACTLY HOW FAR EAST THE
DRYLINE MIXES. THE DRYLINE IS EXPECTED TO WAFFLE BACK TO THE WEST
OVERNIGHT. THE NAM HAS COME AROUND CLOSER TO THE GFS SOLUTION FOR
SUNDAY WITH THE DEEPENING OF A SURFACE LOW OVER WESTERN KANSAS BY
AFTERNOON AND THE DRYLINE MOVING EAST ACROSS THE AREA. THIS WILL
RESULT IN GUSTY SOUTHWEST WINDS OVER MUCH OF THE AREA... WITH VERY
LOW HUMIDITIES AND WARM TEMPERATURES BEHIND THE DRYLINE...
RESULTING IN EXTREME FIRE DANGER LEVELS. DEEP MIXING COULD RESULT
IN WIND GUSTS OVER 35 MPH... WITH A FEW POSSIBLY PUSHING 45 MPH...
AS WINDS IN EXCESS OF 60KTS ARE FORECAST AT 700 MB ACROSS THE
AREA BY SUNDAY AFTERNOON. WILL SCALE BACK THE AREA OF LOW POPS FOR SUNDAY
TO LIMIT THEM PRIMARILY THE SOUTHEAST ZONES... BASED ON THE EXPECTED
LOCATION OF THE DRYLINE BY LATE SUNDAY. AS THE SURFACE LOW MOVES
EAST INTO THE MIDDLE MISSISSIPPI VALLEY... A COLD FRONT WILL DROP
SOUTH INTO THE AREA BY LATE SUNDAY NIGHT... WITH A NAM A LITTLE
SLOWER WITH THIS FEATURE. THIS WILL COOL TEMPERATURES A BIT ON
MONDAY... BUT SOUTH WINDS AND WARMER READINGS WILL RETURN BY
MIDWEEK. ANOTHER COLD FRONT WILL MOVE THROUGH WEDNESDAY NIGHT...
AND FOR NOW... PCPN CHANCES WITH THIS SYSTEM LOOK SLIM.

&&

.PRELIMINARY POINT TEMPS/POPS...
OKLAHOMA CITY OK  80  53  79  43 /  10  10   0  10
HOBART OK         80  48  79  41 /  10  10   0  10
WICHITA FALLS TX  83  54  83  44 /  10  10   0  10
GAGE OK           73  42  70  37 /   0  10  10  10
PONCA CITY OK     75  48  76  43 /  10  10  10  10
DURANT OK         81  61  82  50 /  20  20  20  20

&&

.OUN WATCHES/WARNINGS/ADVISORIES...
OK...RED FLAG WARNING FROM NOON TODAY TO 8 PM CST THIS EVENING FOR
     OKZ004-OKZ005-OKZ006-OKZ007-OKZ008-OKZ009-OKZ010-OKZ011-
     OKZ012-OKZ013-OKZ014-OKZ015-OKZ016-OKZ017-OKZ018-OKZ019-
     OKZ020-OKZ021-OKZ022-OKZ023-OKZ024-OKZ025-OKZ026-OKZ027-
     OKZ028-OKZ029-OKZ030-OKZ033-OKZ034-OKZ035-OKZ036-OKZ037-
     OKZ038-OKZ039-OKZ040-OKZ041-OKZ044-OKZ045-OKZ046-OKZ050.

     FIRE WEATHER WATCH FROM SUNDAY AFTERNOON THROUGH SUNDAY EVENING
     FOR OKZ004-OKZ005-OKZ006-OKZ007-OKZ008-OKZ009-OKZ010-OKZ011-
     OKZ012-OKZ013-OKZ014-OKZ015-OKZ016-OKZ017-OKZ018-OKZ019-
     OKZ020-OKZ021-OKZ022-OKZ023-OKZ024-OKZ025-OKZ026-OKZ027-
     OKZ028-OKZ029-OKZ030-OKZ031-OKZ032-OKZ033-OKZ034-OKZ035-
     OKZ036-OKZ037-OKZ038-OKZ039-OKZ040-OKZ041-OKZ042-OKZ043-
     OKZ044-OKZ045-OKZ046-OKZ047-OKZ048-OKZ050-OKZ051-OKZ052.

TX...RED FLAG WARNING FROM NOON TODAY TO 8 PM CST THIS EVENING FOR
     TXZ083-TXZ084-TXZ085-TXZ086-TXZ087-TXZ088-TXZ089-TXZ090.

     FIRE WEATHER WATCH FROM SUNDAY AFTERNOON THROUGH SUNDAY EVENING
     FOR TXZ083-TXZ084-TXZ085-TXZ086-TXZ087-TXZ088-TXZ089-TXZ090.

&&

30/32

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SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
1228 PM CST SAT MAR 11 2006

OKZ032-111845-
HUGHES OK-
1228 PM CST SAT MAR 11 2006

...SIGNIFICANT WEATHER ADVISORY...

THIS SIGNIFICANT WEATHER ADVISORY IS FOR HUGHES COUNTY.

AT 1228 PM...THUNDERSTORMS WERE INTENSIFYING BETWEEN SPAULDING AND
WETUMKA...MOVING NORTHEAST AT 60 MPH. SMALL HAIL IS LIKELY...AND
FURTHER STRENGTHENING IS LIKELY.

PEOPLE IN HUGHES COUNTY SHOULD MONITOR THE WEATHER SITUATION CLOSELY.
LISTEN FOR WARNINGS AND REMAIN ALERT FOR THREATENING WEATHER
CONDITIONS.

JAMES