Flash Flood Warning 13, NWS Norman, OK

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE OKLAHOMA CITY OK
1030 AM CDT SAT MAY 8 1993

WL XTND FFA FOR THIS AFTN AND TNGT INTO RMNDR OF SWRN OK AND NRN TX THIS
UPDATE. MAIN FOCUS FOR SVR WX AND HVY RNS WL BE BNDRYS ESTABLISHED BY
CNVCTN OVRNGT. STRNG FLOW OF LOW LVL MSTR WL CONT INTO TNGT. WL LWR
TEMPS A FEW PLACES...ESP NRN OK WHERE RAIN COOLED AIR IS WDSPRD.

.OK...FFA CNTRL AND W THIS AFTN AND TNGT ZNS 5>7, 9>11, 13>16, 18
.TX...FFA THIS AFTN AND TNGT ZNS 76 77

OKZ004>021-TXZ076-TXZ077-081800-

THUNDERSTORM OUTLOOK
NATIONAL WEATHER SERVICE OKLAHOMA CITY OK
655 AM CDT SAT MAY 8 1993

SEVERE THUNDERSTORM WATCH NUMBER 226 IS IN EFFECT UNTIL NOON FOR MUCH OF
WESTERN AND CENTRAL OKLAHOMA AND THE WESTERN PART OF NORTH TEXAS.

THERE IS A MODERATE RISK OF SEVERE THUNDERSTORMS TODAY AND TONIGHT
ACROSS WESTERN AND CENTRAL OKLAHOMA AND THE WESTERN PART OF NORTH TEXAS.
THE GREATEST THREAT OF SEVERE THUNDERSTORMS IS WEST OF A LINE FROM PONCA
CITY TO ARDMORE...INCLUDING THE CITIES OF ENID...OKLAHOMA CITY...WICHITA
FALLS...LAWTON...WOODWARD...AND ALTUS.

THERE IS ALSO A SLIGHT RISK OF SEVERE THUNDERSTORMS LATE THIS AFTERNOON
AND TONIGHT OVER SOUTHEASTERN OKLAHOMA EAST OF THE MODERATE RISK AREA.

VERY MOIST AND UNSTABLE AIR WILL CONTINUE OVER MOST OF OKLAHOMA AND
NORTH TEXAS TODAY. THUNDERSTORMS WHICH DEVELOPED OVERNIGHT IN THE TEXAS
PANHANDLE IN ADVANCE OF AN UPPER LEVEL TROUGH WILL CONTINUE MOVING
EASTWARD ACROSS CENTRAL OKLAHOMA AND THE WESTERN PART OF NORTH TEXAS.
LOCALLY HEAVY RAINFALL...GUSTY WINDS...AND HAIL UP TO 1 INCH IN DIAMETER
MAY ACCOMPANY THE THUNDERSTORMS DURING THE EARLY MORNING HOURS. THE
THUNDERSTORMS GRADUALLY WILL WEAKEN DURING THE MORNING.

A PACIFIC COLD FRONT EXTENDED FROM CENTRAL NEBRASKA ACROSS THE EASTERN
OKLAHOMA PANHANDLE TO EASTERN NEW MEXICO ...AND A  DRYLINE EXTENDED
SOUTHWARD FROM SOUTHWESTERN KANSAS ACROSS THE EASTERN TEXAS PANHANDLE TO
THE SOUTHEASTERN CORNER OF NEW MEXICO EARLY THIS MORNING. A VIGOROUS
UPPER LEVEL TROUGH WILL DIG SOUTHEASTWARD FROM SOUTHERN IDAHO TO A LINE
FROM CENTRAL COLORADO TO SOUTHWESTERN NEW MEXICO BY EARLY THIS EVENING.
THE DRYLINE OVER THE TEXAS PANHANDLE WILL ADVANCE INTO WESTERN OKLAHOMA
AND THE WESTERN PART OF NORTH TEXAS LATE THIS MORNING...AND
THUNDERSTORMS ARE LIKELY TO REDEVELOP ALONG THE DRYLINE DURING THE
AFTERNOON. WIDESPREAD THUNDERSTORM ACTIVITY OVERNIGHT HAS MIXED THE
ATMOSPHERE AND HAS REDUCED INSTABILITY SOMEWHAT...AND THE
POTENTIAL FOR A MAJOR SEVERE WEATHER OUTBREAK HAS LESSENED.
HOWEVER...SOME OF THE THUNDERSTORMS LIKELY WILL BECOME SEVERE THIS
AFTERNOON AND TONIGHT WITH LARGE HAIL AND A FEW TORNADOES POSSIBLE.

OUTFLOW FROM THE THUNDERSTORMS MOVING THROUGH WESTERN OKLAHOMA AND NORTH
TEXAS EARLY THIS MORNING WILL ACT AS A FOCUSING MECHANISM FOR
THUNDERSTORM DEVELOPMENT THIS AFTERNOON ACROSS CENTRAL AND SOUTHERN
OKLAHOMA. VERY UNSTABLE AIR AND STRONG WINDS IN THE MID LEVELS OF THE
ATMOSPHERE SUGGEST THAT THESE THUNDERSTORMS ALSO MAY BECOME SEVERE.
THE UPPER LEVEL WIND FIELD IS FAVORABLE FOR TORNADO DEVELOPMENT WITH
THESE THUNDERSTORMS.

THE SEVERE WEATHER THREAT GRADUALLY WILL SHIFT EASTWARD TONIGHT.
HEAVY RAINFALL AND FLOODING IS POSSIBLE...ESPECIALLY ACROSS
CENTRAL AND NORTHERN OKLAHOMA AS STRONG WINDS CONTINUE TO CARRY VERY
MOIST AIR NORTHWARD INTO THE THUNDERSTORM COMPLEX DURING THE
NIGHTTIME HOURS.

STORM SPOTTERS SHOULD BE PREPARED FOR REACTIVATION LATER TODAY.$

OKZ005>009-081800-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE OKLAHOMA CITY OK
935 AM CDT SAT MAY 8 1993

A LINE OF THUNDERSTORMS WITH VERY HEAVY RAINFALL CONTINUES ACROSS
SOUTHWESTERN AND CENTRAL OKLAHOMA. THE THREAT OF SEVERE WEATHER HAS
ENDED FOR THIS MORNING OVER NORTHWESTERN OKLAHOMA. SEVERE THUNDERSTORM
WATCH NUMBER 226 HAS BEEN CANCELLED FOR THE FOLLOWING COUNTIES:

WOODS...ALFALFA...MAJOR...WOODWARD...ROGER MILLS...CUSTER...DEWEY
\...BLAINE...GRANT...GARFIELD...KAY...AND NOBLE.

STAY TUNED TO NOAA WEATHER RADIO FOR LATER UPDATES AND WARNINGS.

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE OKLAHOMA CITY OK
950 AM CDT SAT MAY 8 1993

TIME                COUNTY           EVENT

0755    AM          NOBLE            POWER LINES BLOWN DOWN,ROOF DAMAGE,
                                     MOBILE HOMES DAMAGED,MONUMENTS AT
                                     LOCAL CEMETARY BLOWN OVER, TREES
                                     UPROOTED
0830    AM          KAY              LARGE TREES UPROOTED AND BLOWN
                                     DOWN, POWER POLES DOWN, ROADS
                                     BLOCKED, WINDOWS BLOWN OUT, ROOF
                                     DAMAGE, WALL WESTSIDE OF PONCA CITY
                                     BLOWN DOWN

OKZ004>021-TXZ076-TXZ077-081930-

THUNDERSTORM OUTLOOK
NATIONAL WEATHER SERVICE OKLAHOMA CITY OK
1240 PM CDT SAT MAY 8 1993

SEVERE THUNDERSTORM WATCH NUMBER 228 IS IN EFFECT UNTIL 4 PM FOR MUCH
OF SOUTHWESTERN AND CENTRAL OKLAHOMA AND THE WESTERN PART OF NORTH
TEXAS.

THERE IS A MODERATE RISK OF SEVERE THUNDERSTORMS THIS AFTERNOON AND
TONIGHT ACROSS SOUTHERN AND CENTRAL OKLAHOMA AND THE WESTERN PART OF
NORTH TEXAS...GENERALLY SOUTHEAST OF A REYDON TO STILLWATER LINE.
SOME CITIES INCLUDED IN THE MODERATE RISK AREA ARE OKLAHOMA CITY...
LAWTON...ALTUS...ELK CITY...CLINTON....WEATHERFORD...ARDMORE...
DURANT...ADA...SEMINOLE AND HUGO IN OKLAHOMA AND WICHITA FALLS...
VERNON...CROWELL AND SEYMOUR IN THE WESTERN PART OF NORTH TEXAS.

THERE IS ALSO A SLIGHT RISK OF SEVERE THUNDERSTORMS THIS AFTERNOON
AND TONIGHT IN NORTHERN OKLAHOMA...TO THE NORTH OF THE MODERATE RISK
AREA.

VERY MOIST AND UNSTABLE AIR PREVAILED ACROSS SOUTHERN AND PORTIONS OF
CENTRAL OKLAHOMA AND NORTH TEXAS EARLY THIS AFTERNOON....TO THE SOUTH
OF AN NEARLY STATIONARY OUTFLOW BOUNDARY WHICH EXTENDED FROM NEAR
QUANAH TEXAS TO LAWTON TO MIDWEST CITY TO STROUD. TO THE NORTH OF THIS
BOUNDARY...SCATTERED TO NUMEROUS SHOWERS AND THUNDERSTORMS WERE
OCCURRING.

THUNDERSTORMS WILL CONTINUE TO DEVELOP THIS AFTERNOON AND TONIGHT ALONG
THE OUTFLOW BOUNDARY AND MOVE NORTHEASTWARD. OTHER THUNDERSTORMS
WILL LIKELY DEVELOP ALONG A DRYLINE IN WEST TEXAS AND MOVE INTO
SOUTHWEST OKLAHOMA AND THE WESTERN PORTIONS OF NORTH TEXAS LATE THIS
AFTERNOON AND TONIGHT. SOME THUNDERSTORMS ALONG AND SOUTH OF THE OUTFLOW
BOUNDARY WILL BECOME SEVERE...PRODUCING VERY LARGE HAIL AND STRONG
DAMAGING WINDS. SOME OF THESE STORMS COULD BECOME SUPERCELLS AND HAVE
THE POTENTIAL TO PRODUCE DAMAGING TORNADOES.

OTHER SEVERE THUNDERSTORMS ARE POSSIBLE NORTH OF THE OUTFLOW BOUNDRY
AS WARM MOIST UNSTABLE AIR IS LIFTED OVER THE BOUNDARY. LARGE HAIL AND
STRONG DAMAGING WINDS AND ISOLATED TORNADOES ARE POSSIBLE IN THIS AREA.
HOWEVER...THE MAIN THREAT NORTH OF THE OUTFLOW BOUNDARY IS FLASH
FLOODING WITH THE POSSIBILITY OF SEVERAL INCHES OF RAIN IN A SHORT
PERIOD OF TIME.

THE OUTFLOW BOUNDRY AND THE SIGNIFICANT FLASH FLOOD THREAT IS EXPECTED
TO SHIFT SLOWLY SOUTHWARD LATER THIS AFTERNOON OR TONIGHT.

STORM SPOTTERS SHOULD BE PREPARED FOR ACTIVATION THIS AFTERNOON AND
TONIGHT...ESPECIALLY IN THE MODERATE RISK AREA.