Alert archive / Texas / Flash Flood Warnings in 1991

Flash Flood Warning 21, NWS Shreveport, LA

April 12, 1991Harrison County, Texas

NWS Shreveport, LA issued this flash flood warning at Apr 12, 1991, 8:55 AM CDT for Harrison County, Texas. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued
Apr 12, 1991, 8:55 AM CDT (13:55 UTC)
Expired
Apr 12, 1991, 12:00 PM CDT
In force
3 hr
Issued by
NWS Shreveport, LA
Area
Whole counties

County Harrison County, TX

The nearest sounding before it

Longview/Gregg, TX (KGGG), launched 12:00Z, 1.9 hours before the alert went out and 31 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 12:00Z on 1991-04-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1212 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 12:00Z on 1991-04-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 222 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
1212 J/kg
Mixed-layer CIN
-12 J/kg
Mixed-layer LCL
562 m above ground
0-6 km bulk shear
32 kt
0-1 km storm-relative helicity
222 m²/s²
0-3 km storm-relative helicity
364 m²/s²
Significant tornado parameter
0.0
Supercell composite
7.5

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 Shreveport, LA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 12, 6:55 AM CDTFlash Flood WarningSHVBowie2 hr
Apr 12, 7:20 AM CDTFlash Flood WarningSHVHarrison115 min
Apr 12, 8:55 AM CDTFlash Flood WarningSHVPanola3 hr
Apr 12, 11:50 AM CDTFlash Flood WarningSHVHarrison, Marion, Panola3 hr

Nearby

Flash Flood Warnings in Texas, 1991Every flash flood warning 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; the sounding from the Mesonet's radiosonde archive.