Alert archive / Texas / Tornado Warnings in 1998

Tornado Warning 39, NWS Houston/Galveston, TX

September 11, 1998Galveston County, Harris County, Texas

NWS Houston/Galveston, TX issued this tornado warning at Sep 11, 1998, 1:29 AM CDT for Galveston County, Harris County, Texas. It was in force for 66 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
Sep 11, 1998, 1:29 AM CDT (06:29 UTC)
Expired
Sep 11, 1998, 2:35 AM CDT
In force
66 min
Issued by
NWS Houston/Galveston, TX
Area
Whole counties

Counties Galveston County, TX, Harris County, TX

The radar

The Houston radar (KHGX), 12 km from the middle of the area, began a volume at 06:29 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.

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 00:00Z, 6.5 hours before the alert went out and 193 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, Lake Charles Mun, LA at 00:00Z on 1998-09-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 26 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Lake Charles Mun, LA at 00:00Z on 1998-09-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 273 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
26 J/kg
Mixed-layer CIN
-67 J/kg
Mixed-layer LCL
452 m above ground
0-6 km bulk shear
17 kt
0-1 km storm-relative helicity
273 m²/s²
0-3 km storm-relative helicity
445 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.

000 
TTAA00 KHOU 110629 RRA
TORHOU
TXC167-201-110730-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
129 AM CDT FRI SEP 11 1998

THE NATIONAL WEATHER SERVICE IN HOUSTON/GALVESTON HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHWESTERN GALVESTON COUNTY IN SOUTHEASTERN TEXAS
  SOUTHERN HARRIS COUNTY IN SOUTHEASTERN TEXAS

* UNTIL 235 AM CDT

* AT 127 AM CDT... WEATHER RADAR INDICATED A TORNADIC THUNDERSTORM
  IN THE VICINITY OF TEXAS CITY MOVING NORTHWEST AT 30 MPH.

* THIS TORNADO IS EXPECTED TO BE NEAR...
  TEXAS CITY BY 127 AM CDT
  SAN LEON BY 130 AM CDT
  BACLIFF BY 140 AM CDT
  KEMAH BY 150 AM CDT
  LEAGUE CITY BY 150 AM CDT

 A SECOND TORNADIC STORM WAS INDICATE~D 1 NM NORTHEAST OF THE BOLIVAR
 PENINSULA...MOVING NORTHWEST AT 30 MPH

IF YOU ARE IN THESE AREAS... SEEK SAFETY IN A SMALL INTERIOR ROOM
AWAY FROM WINDOWS.

The office that day

Everything else NWS Houston/Galveston, TX issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Sep 10, 7:13 PM CDTFlash Flood WarningHGXGalveston4 hr
Sep 10, 8:02 PM CDTTornado WarningHGXBrazoria, Galveston63 min
Sep 10, 10:09 PM CDTFlash Flood WarningHGXBrazoria, Matagorda, Wharton4 hr
Sep 10, 10:09 PM CDTFlash Flood WarningHGXFort Bend4 hr
Sep 11, 12:09 AM CDTFlash Flood WarningHGXGalveston4 hr
Sep 11, 2:03 AM CDTFlash Flood WarningHGXBrazoria, Fort Bend, Harris4 hr
Sep 11, 3:31 AM CDTTornado WarningHGXGalveston64 min
Sep 11, 4:01 AM CDTFlash Flood WarningHGXGalveston4 hr
Sep 11, 4:31 AM CDTTornado WarningHGXHarris64 min
Sep 11, 4:39 AM CDTFlash Flood WarningHGXJackson4 hr
Sep 11, 5:32 AM CDTFlash Flood WarningHGXGrimes, Montgomery, Waller4 hr
Sep 11, 5:54 AM CDTFlash Flood WarningHGXHarris4 hr
Sep 11, 6:06 AM CDTTornado WarningHGXFort Bend64 min
Sep 11, 6:18 AM CDTTornado WarningHGXHarris62 min
Sep 11, 7:49 AM CDTFlash Flood WarningHGXBrazoria, Galveston4 hr
Sep 11, 7:49 AM CDTFlash Flood WarningHGXFort Bend4 hr
Sep 11, 8:58 AM CDTFlash Flood WarningHGXHarris6 hr

Nearby

Tornado Warnings in Texas, 1998Every tornado warning in 1998Tornadoes in 1998

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.