Alert archive / Texas / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 97, NWS Houston/Galveston, TX

May 10, 1999Brazoria County, Texas

NWS Houston/Galveston, TX issued this severe thunderstorm warning at May 10, 1999, 6:25 PM CDT for Brazoria County, Texas. It was in force for 35 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
May 10, 1999, 6:25 PM CDT (23:25 UTC)
Expired
May 10, 1999, 7:00 PM CDT
In force
35 min
Issued by
NWS Houston/Galveston, TX
Area
Whole counties; the outline is the Mesonet’s reconstruction

County Brazoria County, TX

The radar

The Houston radar (KHGX), 48 km from the middle of the area, began a volume at 23:28 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 12:00Z, 11.4 hours before the alert went out and 240 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 12:00Z on 1999-05-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1626 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, Lake Charles Mun, LA at 12:00Z on 1999-05-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 40 square meters per square second.1939Sfc1 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
1626 J/kg
Mixed-layer CIN
-38 J/kg
Mixed-layer LCL
624 m above ground
0-6 km bulk shear
24 kt
0-1 km storm-relative helicity
40 m²/s²
0-3 km storm-relative helicity
129 m²/s²
Significant tornado parameter
0.6
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.

The office that day

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

IssuedProductOfficeCountiesLasted
May 10, 5:39 AM CDTSevere Thunderstorm WarningHGXHarris51 min
May 10, 5:49 AM CDTSevere Thunderstorm WarningHGXFort Bend41 min
May 10, 6:02 AM CDTSevere Thunderstorm WarningHGXMontgomery, San Jacinto63 min
May 10, 6:30 AM CDTSevere Thunderstorm WarningHGXBrazoria, Fort Bend, Harris60 min
May 10, 6:30 AM CDTSevere Thunderstorm WarningHGXChambers, Galveston60 min
May 10, 6:30 AM CDTSevere Thunderstorm WarningHGXLiberty60 min
May 10, 7:00 AM CDTTornado WarningHGXBrazoria, Galveston45 min
May 10, 7:08 AM CDTTornado WarningHGXPolk62 min
May 10, 7:13 AM CDTTornado WarningHGXChambers, Liberty62 min
May 10, 7:27 AM CDTTornado WarningHGXChambers, Liberty63 min
May 10, 7:45 AM CDTTornado WarningHGXGalveston60 min
May 10, 12:10 PM CDTSevere Thunderstorm WarningHGXGrimes35 min
May 10, 1:38 PM CDTSevere Thunderstorm WarningHGXMontgomery, San Jacinto37 min
May 10, 5:43 PM CDTSevere Thunderstorm WarningHGXBrazoria, Fort Bend47 min

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.