Severe Thunderstorm Warning 202, NWS Norman, OK

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORMAN OK
143 PM CDT SAT MAY 3 2003

POTENT COMBINATION OF PARMETERS FOR SVR WX APPEAR TO BE COMING
TOGETHER FOR LATER THIS AFT/EVE ACROSS PARTS OF THE CWA.  MAIN AREA
OF FOCUS APPEARS TO BE OVER THE WRN THIRD OF THE CWA..IN COORIDOR
EAST OF DRYLINE AND NORTH OF WARM FRONT..WITH PARTICULAR ATTENTION
FOCUSED ON LOCALES SW OF A CHEYENNE/LAWTON/ARDMORE LINE.  WARM FRONT
AT 18Z LIES FROM JUST NORTH FO THE D/FW METROPLEX..WNWWD ALONG THE
HIGHWAY 287 CORRIDOR OF WRN NTEX. AIRMASS DESTABILIZATION WILL CONT
THRU THE AFTERNOON AS UPPER 60S/LOW 70S DEWPOINTS MOVE NWD.  THERE
IS STILL SOME QUESTION AS TO THE AREAL COVERAGE OF STORMS..AS CAP
STRENGTH APPEARS TO STILL BE AN ISSUE..BUT THERE IS LITTLE DOUBT
THAT IF STORMS FORM THEY WILL BE SVR/SUPERCELLS WITH THE POTENTIAL
FOR SIGNIFICANT SVR REPORTS. CHANCES FOR STORMS WILL CONTINUE WELL
INTO THE NITE AS STRONG LOW LEVEL WAA DEVELOPS.  POTENTIAL ALSO
EXISTS FOR A LATE NITE SQUALL LINE WHEN DRYLINE/PAC COOL FRONT
FINALLY GET A GOOD KICK EWD.

SVR POTENTIAL WILL CONT IN THE ERN SECTIONS OF THE OUN CWA SUN..AND
IT IT NOT OUT OF THE QUESTION THAT THE DRYLINE WILL BE VERY SLOW TO
CLEAR THE FAR SE ZONES AS MOST SIG PUSH EWD WILL BE ACROSS KS/NRN OK.
REMAINDER OF THE CWA SHUD SEE A VERY WINDY AND WARM DAY SUNDAY.
LOW LEVEL RIDGING SHUD BE ENUF TO PUSH BOUNDARY AND DEEP MOISTURE
SOUTH OF THE FA MON..BUT NEXT WAVE APPROACHING TUE/WED SHUD BRING A
GOOD NWD PUSH TO INSTABILITY AXIS WITH MORE STORMS LIKELY TOWARD MID
WEEK.  SIMILAR SCENARIO FOR THUR-SAT TIME FRAME WITH GFS PROGGING
ANOTHER RATHER SIG S/W MOVING ONTO THE PLAINS DAY 7.
 MILLER

OKC   66  85  56  82 / 60  20   0  10
HBR   61  87  54  83 / 60  10   0  10
SPS   69  90  60  84 / 60  20  10  10
GAG   55  85  49  81 / 60  10   0   0
PNC   69  83  54  80 / 70  30   0   0
DUA   68  85  63  83 / 60  60  10  10

.OUN...
OK...NONE.
TX...NONE.

OKZ004>048-050>052-TXZ083>090-041200-

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NORMAN OK
1155 AM CDT SAT MAY 3 2003

THIS HAZARDOUS WEATHER OUTLOOK COVERS NORTHERN...WESTERN...
CENTRAL...AND SOUTHERN OKLAHOMA...AND WESTERN NORTH TEXAS.

.DAY ONE...THIS AFTERNOON AND TONIGHT...

THUNDERSTORM OUTLOOK...
THERE IS A MODERATE RISK OF SEVERE THUNDERSTORMS LATE THIS AFTERNOON
AND TONIGHT ACROSS PORTIONS OF SOUTHERN OKLAHOMA AND WESTERN NORTH
TEXAS. A SLIGHT RISK EXISTS ACROSS THE REMAINDER OF OKLAHOMA.

LOCATION...
THE MODERATE RISK AREA COVERS AREAS SOUTH OF A LINE FROM MANGUM...
TO DUNCAN... TO ARDMORE... TO DURANT...INCLUDING ALL OF WESTERN
NORTH TEXAS. THE SLIGHT RISK COVERS THE AREA NORTH OF THE MODERATE
RISK AREA.

TIMING...
THE MOST LIKELY TIME FOR SEVERE THUNDERSTORMS WILL BE AFTER 3 PM
THROUGH THE OVERNIGHT HOURS.

IMPACTS...
THE STRONGEST STORMS WILL BE CAPABLE OF PRODUCING HAIL UP TO 3
INCHES IN DIAMETER...WIND GUSTS UP TO 70 MPH AND TORNADOES...WITH
THE PRIMARY THREAT BEING LARGE HAIL. LARGE HAIL MAY CAUSE DAMAGE TO
AUTOMOBILES...VEGETATION AND DAMAGE TO ROOF AND WINDOWS

RECOMMENDED ACTIONS...
STORM SPOTTER GROUPS AND EMERGENCY MANAGEMENT PERSONNEL ACROSS THE
RISK AREA SHOULD PLAN FOR SEVERE WEATHER OPERATIONS THIS AFTERNOON
AND TONIGHT.

DISCUSSION...
A WARM FRONT OVER NORTHERN TEXAS LATE THIS MORNING WILL MOVE NORTH
INTO SOUTHERN OKLAHOMA THIS AFTERNOON AND EVENING. A DRYLINE OVER
NEW MEXICO WILL MOVE EAST THIS AFTERNOON...BUT IS EXPECTED TO REMAIN
TO THE WEST OF OKLAHOMA UNTIL TONIGHT.

ALTHOUGH A FEW ELEVATED THUNDERSTORMS WILL BE POSSIBLE LATER
TODAY... A CAP OF WARM AIR 5 TO 6 THOUSAND FEET ABOVE THE GROUND
WILL INHIBIT THUNDERSTORM DEVELOPMENT ACROSS MOST OF THE AREA UNTIL
LATE THIS AFTERNOON. DAYTIME HEATING AND CONVERGENCE ALONG THE WARM
FRONT MAY OVERCOME THE CAP LATE THIS AFTERNOON ALLOWING
THUNDERSTORMS TO DEVELOP. IF SURFACE-BASED THUNDERSTORMS DEVELOP
THIS AFTERNOON... THESE THUNDERSTORMS WILL LIKELY BECOME SEVERE DUE
TO HIGH INSTABILITY AND STRONG WIND SHEAR...WITH SUPERCELL
THUNDERSTORMS POSSIBLE. ANY SUPERCELL THUNDERSTORMS THAT DEVELOP AND
ARE ABLE TO INTERACT WITH SURFACE BOUNDARIES WILL HAVE THE POTENTIAL
TO PRODUCE TORNADOES THIS EVENING...ESPECIALLY ACROSS THE MODERATE
RISK AREA.

MORE WIDESPREAD THUNDERSTORMS WILL BE POSSIBLE TONIGHT AS A STRONGER
UPPER LEVEL STORM SYSTEM APPROACHES THE AREA...ESPECIALLY NORTH OF
THE WARM FRONT. THE RISK OF SEVERE WEATHER WILL CONTINUE OVERNIGHT
AND THE WIND SHEAR WILL STILL BE STRONG ENOUGH TO SUPPORT ISOLATED
SUPERCELL THUNDERSTORMS.

PROBABILITY TABLE...
VALID THROUGH 700 AM CDT SUNDAY MAY 4.
PROBABILITY OF THUNDERSTORMS OCCURRING IN THE
              NWS NORMAN COUNTY WARNING AREA...60 PERCENT.
PROBABILITY OF SEVERE STORMS IF STORMS OCCUR...100 PERCENT.

OTHER HAZARDOUS WEATHER...
ASIDE FROM THE SEVERE WEATHER DANGER...NO OTHER HAZARDOUS WEATHER IS
EXPECTED THROUGH TONIGHT.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY...

THUNDERSTORM OUTLOOK...
SCATTERED THUNDERSTORMS AND THE RISK OF SEVERE WEATHER WILL CONTINUE
SUNDAY ACROSS EASTERN SECTIONS OF OKLAHOMA BEFORE THUNDERSTORM
CHANCES END SUNDAY EVENING. THE CHANCE OF THUNDERSTORMS WILL RETURN
TO THE AREA ON TUESDAY AND WEDNESDAY...THEN AGAIN FRIDAY INTO
SATURDAY.

OTHER HAZARDOUS WEATHER...
AS A DRY LINE MOVES THROUGH WESTERN AND CENTRAL OKLAHOMA...AND
WESTERN NORTH TEXAS ON SUNDAY...VERY STRONG WESTERLY WINDS AND LOW
HUMIDITIES WILL RESULT IN DANGEROUS WILDFIRE CONDITIONS SUNDAY
AFTERNOON.

THE NEXT SCHEDULED HAZARDOUS WEATHER OUTLOOK WILL BE ISSUED AT 7 AM
SUNDAY.

30

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
654 PM CDT SAT MAY 03 2003

TIME (CDT) .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0645 PM    4 W HOLLIS                OK   1.50 INCH HAIL
05/03/03   HARMON                         PUBLIC REPORT

KT

OKZ021-034-036-040015-

SIGNIFICANT WEATHER ADVISORY
NATIONAL WEATHER SERVICE NORMAN OK
655 PM CDT SAT MAY 3 2003

THIS SIGNIFICANT WEATHER ADVISORY IS FOR BECKHAM...GREER AND JACKSON
COUNTIES.

A SEVERE THUNDERSTORM WAS LOCATED 11 MILES WEST OF DUKE AT 655 PM
CDT...MOVING NORTH-NORTHEAST AT 35 MPH.

PEOPLE IN BECKHAM...GREER AND JACKSON COUNTIES...INCLUDING THE CITY
OF ALTUS...SHOULD MONITOR THIS STORM CLOSELY. LISTEN FOR WARNINGS
AND WATCH FOR THREATENING WEATHER CONDITIONS AS THIS STORM
APPROACHES.

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