Alert archive / Texas / Tornado Warnings in 1991

Tornado Warning 11, NWS Houston/Galveston, TX

April 17, 1991Harris County, Texas

NWS Houston/Galveston, TX issued this tornado warning at Apr 17, 1991, 10:16 PM CDT for Harris County, Texas. It was in force for 59 min. 1 report came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued
Apr 17, 1991, 10:16 PM CDT (03:16 UTC)
Expired
Apr 17, 1991, 11:15 PM CDT
In force
59 min
Issued by
NWS Houston/Galveston, TX
Area
Whole counties

County Harris County, TX

What was reported inside it

TimeReportWhereRemark
Apr 17, 10:55 PM CDTThunderstorm Wind 70Harris, TX

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.

The nearest sounding before it

Longview/Gregg, TX (KGGG), launched 00:00Z, 3.3 hours before the alert went out and 287 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, Longview/Gregg, TX at 00:00Z on 1991-04-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1509 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, Longview/Gregg, TX at 00:00Z on 1991-04-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 60 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
1509 J/kg
Mixed-layer CIN
-2 J/kg
Mixed-layer LCL
653 m above ground
0-6 km bulk shear
24 kt
0-1 km storm-relative helicity
60 m²/s²
0-3 km storm-relative helicity
125 m²/s²
Significant tornado parameter
0.3
Supercell composite
1.8

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
Apr 17, 7:22 PM CDTSevere Thunderstorm WarningHGXAustin, Washington68 min
Apr 17, 8:51 PM CDTSevere Thunderstorm WarningHGXAustin, Fort Bend, Waller69 min
Apr 17, 9:43 PM CDTSevere Thunderstorm WarningHGXAustin, Colorado62 min
Apr 17, 9:48 PM CDTSevere Thunderstorm WarningHGXHarris57 min
Apr 17, 10:09 PM CDTFlash Flood WarningHGXMontgomery2 hr
Apr 17, 11:09 PM CDTSevere Thunderstorm WarningHGXPolk, San Jacinto66 min
Apr 17, 11:09 PM CDTSevere Thunderstorm WarningHGXColorado66 min
Apr 17, 11:15 PM CDTSevere Thunderstorm WarningHGXChambers60 min
Apr 17, 11:17 PM CDTSevere Thunderstorm WarningHGXGalveston58 min
Apr 17, 11:28 PM CDTSevere Thunderstorm WarningHGXHarris32 min

Nearby

Tornado Warnings in Texas, 1991Every tornado warning in 1991Tornadoes in 1991

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.