Alert archive / Texas / Tornado Watches in 1999

Tornado Watch 248

May 11, 199935 counties in Texas

The Storm Prediction Center issued this tornado watch at May 11, 1999, 3:30 PM CDT for 35 counties in Texas. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued
May 11, 1999, 3:30 PM CDT (20:30 UTC)
Expired
May 11, 1999, 10:00 PM CDT
In force
7 hr
Issued by
the Storm Prediction Center
All 35 counties

Bandera County, TX, Bastrop County, TX, Bell County, TX, Bexar County, TX, Blanco County, TX, Brown County, TX, Burnet County, TX, Caldwell County, TX, Comal County, TX, Coryell County, TX, DeWitt County, TX, Falls County, TX, Gillespie County, TX, Gonzales County, TX, Guadalupe County, TX, Hamilton County, TX, Hays County, TX, Kendall County, TX, Kerr County, TX, Kimble County, TX, Lampasas County, TX, Lee County, TX, Llano County, TX, Mason County, TX, McCulloch County, TX, McLennan County, TX, Medina County, TX, Milam County, TX, Mills County, TX, Real County, TX, San Saba County, TX, Travis County, TX, Uvalde County, TX, Williamson County, TX, Wilson County, TX

The radar

The Austin/San Antonio radar (KEWX), 85 km from the middle of the area, began a volume at 20:29 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
May 11, 3:35 PM CDTSevere Thunderstorm WarningSJTBrown65 min
May 11, 3:44 PM CDTSevere Thunderstorm WarningFWDMills61 min
May 11, 3:55 PM CDTTornado WarningSJTBrown, McCulloch50 min
May 11, 4:08 PM CDTTornado WarningSJTSan Saba67 min
May 11, 4:24 PM CDTFlash Flood WarningFWDMills3 hr
May 11, 4:39 PM CDTSevere Thunderstorm WarningFWDMills66 min
May 11, 4:59 PM CDTSevere Thunderstorm WarningSJTBrown51 min
May 11, 5:06 PM CDTSevere Thunderstorm WarningEWXLlano54 min
May 11, 5:12 PM CDTTornado WarningSJTSan Saba63 min
May 11, 5:14 PM CDTFlash Flood WarningSJTSan Saba3 hr
May 11, 5:45 PM CDTSevere Thunderstorm WarningSJTMcCulloch65 min
May 11, 5:49 PM CDTSevere Thunderstorm WarningSJTMason66 min
May 11, 5:49 PM CDTSevere Thunderstorm WarningSJTBrown41 min
May 11, 5:55 PM CDTSevere Thunderstorm WarningEWXLlano60 min
May 11, 6:03 PM CDTTornado WarningEWXLlano62 min
May 11, 6:08 PM CDTTornado WarningSJTMason47 min
May 11, 6:18 PM CDTFlash Flood WarningEWXLlano3 hr
May 11, 6:49 PM CDTSevere Thunderstorm WarningFWDLampasas56 min
May 11, 6:50 PM CDTTornado WarningSJTMason65 min
May 11, 6:53 PM CDTFlash Flood WarningSJTMason3 hr
May 11, 7:03 PM CDTTornado WarningEWXLlano62 min
May 11, 7:22 PM CDTSevere Thunderstorm WarningEWXGillespie63 min
May 11, 7:28 PM CDTTornado WarningEWXGillespie62 min
May 11, 7:28 PM CDTSevere Thunderstorm WarningFWDCoryell42 min
May 11, 7:34 PM CDTSevere Thunderstorm WarningFWDMcLennan56 min
May 11, 8:14 PM CDTFlash Flood WarningEWXGillespie3 hr
May 11, 8:14 PM CDTFlash Flood WarningEWXBurnet3 hr
May 11, 8:26 PM CDTTornado WarningEWXGillespie64 min
May 11, 8:29 PM CDTTornado WarningEWXBurnet61 min
May 11, 8:34 PM CDTSevere Thunderstorm WarningEWXKerr61 min
May 11, 8:50 PM CDTSevere Thunderstorm WarningEWXWilliamson60 min
May 11, 9:16 PM CDTFlash Flood WarningEWXWilliamson3 hr
May 11, 9:35 PM CDTSevere Thunderstorm WarningEWXKerr60 min
May 11, 9:39 PM CDTSevere Thunderstorm WarningEWXReal2 hr
May 11, 9:41 PM CDTSevere Thunderstorm WarningFWDMilam64 min

The nearest sounding before it

Del Rio, TX (KDRT), launched 12:00Z, 8.5 hours before the alert went out and 216 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, Del Rio, TX at 12:00Z on 1999-05-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2571 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, Del Rio, TX at 12:00Z on 1999-05-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 126 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
2571 J/kg
Mixed-layer CIN
-131 J/kg
Mixed-layer LCL
553 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
126 m²/s²
0-3 km storm-relative helicity
186 m²/s²
Significant tornado parameter
0.0
Supercell composite
3.8

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 10, 8:45 PM CDTSevere Thunderstorm WatchSPCBrooks, Cameron, Hidalgo, Jim Hogg, Kenedy, Kleberg and 2 more4 hr
May 11, 5:45 PM CDTTornado WatchSPCBosque, Brown, Clay, Coleman, Collin, Comanche and 27 more4 hr

Nearby

Tornado Watches in Texas, 1999Every tornado 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; radar from the NEXRAD Level II archive.