Alert archive / Louisiana / Flash Flood Warnings in 1991

Flash Flood Warning 101, NWS Shreveport, LA

April 28, 1991Natchitoches Parish, Winn Parish, Louisiana

NWS Shreveport, LA issued this flash flood warning at Apr 28, 1991, 9:47 PM CDT for Natchitoches Parish, Winn Parish, Louisiana. It was in force for 4 hr.

The area

The counties it named.

The facts

Issued
Apr 28, 1991, 9:47 PM CDT (02:47 UTC)
Expired
Apr 29, 1991, 1:45 AM CDT
In force
4 hr
Issued by
NWS Shreveport, LA
Area
Whole counties

Counties Natchitoches Parish, LA, Winn Parish, LA

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 00:00Z, 2.8 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 1991-04-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2308 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 00:00Z on 1991-04-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 190 square meters per square second.19395878Sfc1 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
2308 J/kg
Mixed-layer CIN
-72 J/kg
Mixed-layer LCL
581 m above ground
0-6 km bulk shear
52 kt
0-1 km storm-relative helicity
190 m²/s²
0-3 km storm-relative helicity
195 m²/s²
Significant tornado parameter
2.4
Supercell composite
7.8

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 Shreveport, LA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 28, 7:03 PM CDTSevere Thunderstorm WarningSHVBienville, Claiborne, Lincoln, Union117 min
Apr 28, 7:03 PM CDTSevere Thunderstorm WarningSHVJackson117 min
Apr 28, 7:03 PM CDTSevere Thunderstorm WarningSHVNatchitoches, Sabine117 min
Apr 28, 7:32 PM CDTFlash Flood WarningSHVMorehouse, Ouachita, Union4 hr
Apr 28, 7:32 PM CDTFlash Flood WarningSHVBienville, Claiborne, Lincoln4 hr
Apr 28, 7:32 PM CDTFlash Flood WarningSHVJackson4 hr
Apr 28, 8:44 PM CDTSevere Thunderstorm WarningSHVMorehouse, Ouachita, Richland106 min
Apr 28, 8:44 PM CDTSevere Thunderstorm WarningSHVWest Carroll106 min
Apr 28, 9:20 PM CDTSevere Thunderstorm WarningSHVEast Carroll85 min
Apr 28, 9:47 PM CDTFlash Flood WarningSHVEast Carroll4 hr
Apr 28, 9:47 PM CDTFlash Flood WarningSHVRed River4 hr
Apr 28, 9:47 PM CDTFlash Flood WarningSHVBienville, Claiborne, Jackson, Lincoln, Ouachita, Union4 hr
Apr 28, 9:47 PM CDTFlash Flood WarningSHVDe Soto, Sabine4 hr
Apr 28, 9:47 PM CDTFlash Flood WarningSHVWebster4 hr
Apr 28, 9:47 PM CDTFlash Flood WarningSHVMorehouse, Richland, West Carroll4 hr
Apr 28, 10:12 PM CDTSevere Thunderstorm WarningSHVDe Soto, Red River, Sabine78 min
Apr 29, 1:08 AM CDTSevere Thunderstorm WarningSHVEast Carroll, Franklin, Madison, Tensas2 hr
Apr 29, 1:43 AM CDTFlash Flood WarningSHVBienville, Claiborne, Lincoln, Union7 hr
Apr 29, 1:43 AM CDTFlash Flood WarningSHVMorehouse, Ouachita, Richland, West Carroll7 hr
Apr 29, 1:43 AM CDTFlash Flood WarningSHVEast Carroll, Franklin, Madison, Tensas7 hr
Apr 29, 1:43 AM CDTFlash Flood WarningSHVCaldwell, Jackson, Winn7 hr
Apr 29, 1:43 AM CDTFlash Flood WarningSHVNatchitoches, Sabine7 hr

Nearby

Flash Flood Warnings in Louisiana, 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.