Severe Thunderstorm Warning 339, NWS Fort Worth, TX

AREA FORECAST DISCUSSION...UPDATED FOR AVIATION
NATIONAL WEATHER SERVICE FORT WORTH TX
1230 PM CDT SAT MAY 27 2000

AVIATION DISCUSSION...
THUNDERSTORMS HAVE BEGUN TO DEVELOP ON COOL FRONT/OUTFLOW BOUNDARY
FROM WICHITA FALLS TO THROCKMORTON.  EXPECT RAPID DEVELOPMENT AND
INTENSIFICATION DUE TO HIGH CAPE AND INSTABILITIES OVER NORTH
TEXAS.  STORMS MAY BECOME SEVERE 18-19Z WITH PRIMARY SEVERE THREAT
LARGE HAIL AND HIGH STRAIGHT LINE DAMAGING WINDS.  ISOLATED
TORNADOES POSSIBLE DURING PEAK HEATING HOURS THIS AFTERNOON AND
EVENING.  EXPECT THUNDERSTORMS IN THE DFW AREA AFTER 20Z...PROBABLY
IN THE FORM OF A BROKEN LINE OF STORMS.  TRANQUIL WEATHER TONIGHT
AFTER STORMS PASS THROUGH THE AREA WITH A WARMING TREND THROUGH MID
WEEK.

59

TXZ091>095-100>107-115>123-129>135-141>148-156>162-174-175-271700-

HAZARDOUS WEATHER OUTLOOK FOR NORTH TEXAS...UPDATED
NATIONAL WEATHER SERVICE FORT WORTH TX
835 AM CDT SAT MAY 27 2000

THERE IS A MODERATE RISK OF SEVERE THUNDERSTORMS THIS AFTERNOON AND
TONIGHT ACROSS THE NORTHERN THIRD OF NORTH TEXAS.  THE MODERATE RISK
AREA IS GENERALLY ALONG AND NORTH OF A SULPHUR SPRINGS...TO GLEN
ROSE...TO EASTLAND LINE.  INCLUDED IN THE MODERATE RISK AREA ARE
GAINESVILLE...SHERMAN...BONHAM...PARIS...BRECKENRIDGE...MINERAL
WELLS...GREENVILLE...AND THE DALLAS FORT WORTH METROPLEX. THERE IS A
SLIGHT RISK OF SEVERE THUNDERSTORMS THIS AFTERNOON AND EVENING ACROSS
THE REST OF NORTH TEXAS.  THE MAIN THREAT WILL BE FROM DAMAGING
DOWNBURST WINDS AND LARGE HAIL.

AROUND MID MORNING...A COLD FRONT THAT EXTENDED FROM CHILDRESS...
SOUTHWEST THROUGH INTO SOUTHEASTERN NEW MEXICO WAS MOVING SLOWLY
SOUTHEAST. AN OUTFLOW BOUNDARY OVER SOUTHERN OKLAHOMA...NEAR AN
MCALESTER...TO LAWTON LINE...WAS ALSO MOVING SOUTHEAST. THE
COMBINATION OF THE FRONT...OUTFLOW BOUNDARY...AND A MOIST AND
UNSTABLE AIR....WILL RESULT IN THE DEVELOPMENT OF SCATTERED STRONG TO
SEVERE THUNDERSTORMS. THE STRONGEST STORMS WILL BE CAPABLE OF
PRODUCING GOLFBALL OR LARGER HAIL AND STRONG DOWNBURST WINDS.

IN ADDITION...VERTICAL WIND PROFILES SUGGEST THAT AN ISOLATED TORNADO
OR TWO MAY OCCUR NEAR THE VICINITY OF THE FRONT AND OUTFLOW BOUNDARY
DURING MAXIMUM AFTERNOON HEATING...GENERALLY ALONG AND NORTH OF
INTERSTATE 20.

SPOTTERS NORTH AND WEST OF A STEPHENVILLE...FORT WORTH...BONHAM LINE
MAY BE ACTIVATED BETWEEN 2 AND 6 PM...AND EAST OF THIS LINE AFTER 6
PM.

FOR HAZARDOUS WEATHER/THUNDERSTORM OUTLOOKS FOR ADJACENT AREAS...SEE
OKCSPSOKC (NORTHWESTERN TEXAS...WESTERN AND CENTRAL OKLAHOMA)...
OKCSPSTUL (EASTERN OKLAHOMA AND NORTHWEST ARKANSAS)...NEWSPSSHV
(NORTHEAST TEXAS...NORTHWESTERN LOUISIANA...EXTREME SOUTHEASTERN
OKLAHOMA AND SOUTHWESTERN ARKANSAS)...SATSPSHOU (SOUTHEAST TEXAS)...
SATSPSSAT (SOUTH CENTRAL TEXAS)...AND LBBSPSSJT (WEST CENTRAL
TEXAS).

TXZ091>095-100>107-115>123-129>135-141>148-156>162-174-175-272100-

HAZARDOUS WEATHER OUTLOOK FOR NORTH TEXAS
NATIONAL WEATHER SERVICE FORT WORTH TX
1115 AM CDT SAT MAY 27 2000

THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS ALL OF NORTH
TEXAS THIS AFTERNOON AND TONIGHT.

LATE THIS MORNING MOISTURE AND INSTABILITY VALUES REMAIN VERY HIGH
ACROSS NORTH TEXAS.  A WEAK COOL FRONT/OUTFLOW BOUNDARY EXTENDED FROM
SOUTHEAST OKLAHOMA...WEST SOUTHWEST TO NEAR WICHITA FALLS...THEN
SOUTHWEST GENERALLY ALONG A SEYMOUR TO ROBY LINE.  WITH AFTERNOON
HEATING...THUNDERSTORMS ARE EXPECTED TO FORM ALONG THIS BOUNDARY
AS IT MOVES SOUTHEAST.

DUE TO THE AMOUNT OF MOISTURE AND INSTABILITY AVAILABLE...THE STORMS
THAT DO DEVELOP WILL QUICKLY BECOME SEVERE. THE MAIN SEVERE WEATHER
THREAT WILL BE LARGE HAIL AND STRONG DOWNBURST WINDS.  ISOLATED
TORNADOES ARE POSSIBLE DURING THE LATE AFTERNOON AND EVENING...
DURING PEAK HEATING HOURS.

PERSONS ACROSS NORTH TEXAS ENGAGED IN OUTDOOR ACTIVITIES THIS
AFTERNOON AND TONIGHT SHOULD STAY ABREAST OF THE LATEST WEATHER
DEVELOPMENTS.  AGAIN...STORMS THAT DO DEVELOP...WILL RAPIDLY
INTENSIFY AND BECOME SEVERE IN A SHORT PERIOD OF TIME.

SPOTTERS NORTH AND WEST OF A LAMPASAS...STEPHENVILLE...FORT WORTH...
SULPHUR SPRINGS LINE MAY BE ACTIVATED BETWEEN 2 AND 6 PM...AND EAST
AND SOUTH OF THIS LINE AFTER 6 PM.

FOR HAZARDOUS WEATHER/THUNDERSTORM OUTLOOKS FOR ADJACENT AREAS...SEE
OKCSPSOKC (NORTHWESTERN TEXAS...WESTERN AND CENTRAL OKLAHOMA)...
OKCSPSTUL (EASTERN OKLAHOMA AND NORTHWEST ARKANSAS)...NEWSPSSHV
(NORTHEAST TEXAS...NORTHWESTERN LOUISIANA...EXTREME SOUTHEASTERN
OKLAHOMA AND SOUTHWESTERN ARKANSAS)...SATSPSHOU (SOUTHEAST TEXAS)...
SATSPSSAT (SOUTH CENTRAL TEXAS)...AND LBBSPSSJT (WEST CENTRAL
TEXAS).