Alert archive / Texas / Tornado Warnings in 1999

Tornado Warning 6, NWS Lubbock, TX

April 30, 1999Yoakum County, Texas

NWS Lubbock, TX issued this tornado warning at Apr 30, 1999, 6:40 PM CDT for Yoakum County, Texas. It was in force for 30 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Apr 30, 1999, 6:40 PM CDT (23:40 UTC)
Expired
Apr 30, 1999, 7:10 PM CDT
In force
30 min
Issued by
NWS Lubbock, TX
Area
Whole counties

County Yoakum County, TX

The radar

The Lubbock radar (KLBB), 108 km from the middle of the area, began a volume at 23:41 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.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Apr 30, 5:00 PM CDTTornado WatchSPC6 hr

The nearest sounding before it

Midland Regional, TX (KMAF), launched 12:00Z, 11.7 hours before the alert went out and 148 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, Midland Regional, TX at 12:00Z on 1999-04-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 21 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, Midland Regional, TX at 12:00Z on 1999-04-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 216 square meters per square second.19395878Sfc1 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
21 J/kg
Mixed-layer CIN
-289 J/kg
Mixed-layer LCL
1062 m above ground
0-6 km bulk shear
41 kt
0-1 km storm-relative helicity
216 m²/s²
0-3 km storm-relative helicity
296 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.8

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KLBB 302340 RRA
TORLBB
TXC501-010010-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE LUBBOCK TX
640 PM CDT FRI APR 30 1999

THE NATIONAL WEATHER SERVICE IN LUBBOCK HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHERN YOAKUM COUNTY IN NORTHWESTERN TEXAS

* UNTIL 710 PM CDT

* AT 638 PM CDT... SKYWARN SPOTTERS REPORTED A TORNADO 8 MILES
NORTHEAST OF PLAINS... MOVING NORTH AT 10 MPH.

THIS TORNADIC THUNDERSTORM IS EXPECTED TO REMAIN OVER RUTRAL AREAS.

GO TO A SMALL INTERIOR ROOM AWAY FROM WINDOWS.




&

The office that day

Everything else NWS Lubbock, TX issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 30, 4:42 PM CDTTornado WarningLUBYoakum33 min
Apr 30, 5:27 PM CDTSevere Thunderstorm WarningLUBYoakum48 min
Apr 30, 5:43 PM CDTFlash Flood WarningLUBYoakum3 hr
Apr 30, 6:07 PM CDTTornado WarningLUBYoakum33 min
Apr 30, 6:23 PM CDTFlash Flood WarningLUBCastro4 hr
Apr 30, 6:48 PM CDTFlash Flood WarningLUBCochran, Lamb4 hr

Nearby

Tornado Warnings in Texas, 1999Every tornado warning in 1999Tornadoes 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.