Alert archive / Texas / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 21, NWS Lubbock, TX

April 28, 1999Hockley County, Lamb County, Texas

NWS Lubbock, TX issued this severe thunderstorm warning at Apr 28, 1999, 6:05 PM CDT for Hockley County, Lamb County, Texas. It was in force for 40 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties.

The facts

Issued
Apr 28, 1999, 6:05 PM CDT (23:05 UTC)
Expired
Apr 28, 1999, 6:45 PM CDT
In force
40 min
Issued by
NWS Lubbock, TX
Area
Whole counties; the outline is the Mesonet’s reconstruction

Counties Hockley County, TX, Lamb County, TX

The radar

The Lubbock radar (KLBB), 51 km from the middle of the area, began a volume at 23:06 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 28, 5:30 PM CDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Amarillo Airport, TX (KAMA), launched 12:00Z, 11.1 hours before the alert went out and 173 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, Amarillo Airport, TX at 12:00Z on 1999-04-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 70 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, Amarillo Airport, TX at 12:00Z on 1999-04-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 179 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
70 J/kg
Mixed-layer CIN
-359 J/kg
Mixed-layer LCL
1995 m above ground
0-6 km bulk shear
14 kt
0-1 km storm-relative helicity
179 m²/s²
0-3 km storm-relative helicity
245 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

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

999 
WUUS1 KLBB 282307 RRA
SVRLBB
TXC219-279-282345-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE LUBBOCK TX
605 PM CDT WED APR 28 1999

THE NATIONAL WEATHER SERVICE IN LUBBOCK HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN HOCKLEY COUNTY IN NORTHWEST TEXAS  
  SOUTHEASTERN LAMB COUNTY IN NORTHWEST TEXAS

* UNTIL 645 PM CDT

* AT 601 PM CDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM OVER
  LEVELLAND...MOVING NORTH AT 30 MPH.

* THE SEVERE THUNDERSTORM COULD AFFECT THE FOLLOWING COMMUNITIES...
  WHITHARRAL...LITTLEFIELD...AMHERST...FIELDTON 

IF SEVERE WEATHER APPROACHES YOUR AREA...GO INSIDE A STURDY SHELTER.
REMEMBER...A SEVERE THUNDERSTORM CAN PRODUCE LARGE HAIL...DAMAGING
WINDS...DEADLY LIGHTNING...AND HEAVY RAIN.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1100 PM CDT 
WEDNESDAY EVENING FOR NORTHWESTERN TEXAS.  

LAT...LON 3355 10248 3352 10226 3409 10212 3413 10242

Nearby

Severe Thunderstorm Warnings in Texas, 1999Every severe thunderstorm warning 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.