Alert archive / Texas / Severe Thunderstorm Watches in 1999

Severe Thunderstorm Watch 252

May 11, 1999Little River County, Arkansas; 39 counties in Texas

The Storm Prediction Center issued this severe thunderstorm watch at May 11, 1999, 9:15 PM CDT for Little River County, Arkansas; 39 counties in Texas. It was in force for 4 hr.

The area

The outline as issued.

The facts

Issued
May 11, 1999, 9:15 PM CDT (02:15 UTC)
Expired
May 12, 1999, 1:00 AM CDT
In force
4 hr
Issued by
the Storm Prediction Center
All 40 counties

Little River County, AR, Bowie County, TX, Camp County, TX, Cass County, TX, Collin County, TX, Cooke County, TX, Dallas County, TX, Delta County, TX, Denton County, TX, Ellis County, TX, Erath County, TX, Fannin County, TX, Franklin County, TX, Grayson County, TX, Gregg County, TX, Harrison County, TX, Henderson County, TX, Hood County, TX, Hopkins County, TX, Hunt County, TX, Johnson County, TX, Kaufman County, TX, Lamar County, TX, Marion County, TX, Montague County, TX, Morris County, TX, Panola County, TX, Parker County, TX, Rains County, TX, Red River County, TX, Rockwall County, TX, Rusk County, TX, Smith County, TX, Somervell County, TX, Tarrant County, TX, Titus County, TX, Upshur County, TX, Van Zandt County, TX, Wise County, TX, Wood County, TX

Warnings issued inside it

8 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
May 11, 9:15 PM CDTSevere Thunderstorm WarningFWDAnderson, Henderson, Navarro60 min
May 11, 9:19 PM CDTSevere Thunderstorm WarningFWDErath, Hood56 min
May 11, 9:27 PM CDTSevere Thunderstorm WarningFWDDelta, Lamar63 min
May 11, 9:51 PM CDTSevere Thunderstorm WarningFWDCollin54 min
May 11, 9:55 PM CDTSevere Thunderstorm WarningFWDKaufman, Van Zandt65 min
May 11, 10:22 PM CDTSevere Thunderstorm WarningFWDHunt53 min
May 11, 10:40 PM CDTSevere Thunderstorm WarningFWDFannin65 min
May 11, 11:04 PM CDTSevere Thunderstorm WarningFWDHopkins56 min

The nearest sounding before it

Fort Worth, TX (KFWD), launched 00:00Z, 2.3 hours before the alert went out and 74 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Fort Worth, TX at 00:00Z on 1999-05-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2666 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Fort Worth, TX at 00:00Z on 1999-05-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 31 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
2666 J/kg
Mixed-layer CIN
-27 J/kg
Mixed-layer LCL
881 m above ground
0-6 km bulk shear
35 kt
0-1 km storm-relative helicity
31 m²/s²
0-3 km storm-relative helicity
86 m²/s²
Significant tornado parameter
0.7
Supercell composite
5.7

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

999 
WWUS9 KMKC 120146
SEL2  
MKC WW 120146
TXZ000-120600-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 252
STORM PREDICTION CENTER NORMAN OK
846 PM CDT TUE MAY 11 1999

THE STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

   NORTHERN AND EASTERN TEXAS                              

EFFECTIVE THIS TUESDAY NIGHT AND WEDNESDAY MORNING FROM 915 PM
UNTIL 100 AM CDT.

HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE SEVERE THUNDERSTORM WATCH AREA IS ALONG AND 120 STATUTE MILES
EAST AND WEST OF A LINE FROM 50 MILES WEST SOUTHWEST OF TYLER TEXAS
TO 30 MILES WEST NORTHWEST OF PARIS TEXAS.

REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
FAVORABLE FOR SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH AREA. 
PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR THREATENING
WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS AND POSSIBLE
WARNINGS.

OTHER WATCH INFORMATION...THIS SEVERE THUNDERSTORM WATCH REPLACES
TORNADO WATCH NUMBER 249.  WATCH NUMBER 249 WILL NOT BE IN EFFECT
AFTER 915 PM CDT.  CONTINUE...WW 250...WW 251...

DISCUSSION...SCATTERED STORMS...INCLUDING A FEW SUPERCELLS...WITH
LARGE HAIL/DAMAGING WINDS POSSIBLE ACROSS WATCH AREA THIS EVENING
AS INCREASING MID/UPPER LEVEL FLOW CONTINUES TO OVERSPREAD SURFACE-
BASED INSTABILITY AXIS BENEATH MID-LEVEL STEEP LAPSE RATES.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2 INCHES.  EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS.  A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500.  MEAN STORM
MOTION VECTOR 28025.

...CORFIDI

320,0981 334,0980 334,0935 320,0940

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 11, 10:45 PM CDTSevere Thunderstorm WatchSPCCalhoun, Clark, Columbia, Dallas, Garland, Hempstead and 14 more5 hr
May 11, 8:30 PM CDTTornado WatchSPCAnderson, Atascosa, Bandera, Bastrop, Bell, Bexar and 37 more4 hr
May 12, 12:00 AM CDTSevere Thunderstorm WatchSPCAngelina, Grimes, Hardin, Jasper, Liberty, Montgomery and 12 more4 hr
May 12, 12:00 AM CDTSevere Thunderstorm WatchSPCAtascosa, Dimmit, Duval, Frio, Jim Wells, Kinney and 9 more5 hr
May 12, 4:30 AM CDTSevere Thunderstorm WatchSPCAransas, Bee, Calhoun, DeWitt, Duval, Goliad and 13 more6 hr

Nearby

Severe Thunderstorm Watches in Texas, 1999Severe Thunderstorm Watches in Arkansas, 1999Every severe thunderstorm watch in 1999

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive.