Alert archive / Louisiana / Flash Flood Warnings in 1991

Flash Flood Warning 99, NWS Shreveport, LA

April 28, 1991Morehouse Parish, Richland Parish, West Carroll Parish, Louisiana

NWS Shreveport, LA issued this flash flood warning at Apr 28, 1991, 9:47 PM CDT for Morehouse Parish, Richland Parish, West Carroll 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 Morehouse Parish, LA, Richland Parish, LA, West Carroll Parish, LA

The nearest sounding before it

Jackson, MS (KJAN), launched 00:00Z, 2.8 hours before the alert went out and 155 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, Jackson, MS at 00:00Z on 1991-04-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 515 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Jackson, MS at 00:00Z on 1991-04-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 134 square meters per square second.193958Sfc1 km3 km6 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
515 J/kg
Mixed-layer CIN
-38 J/kg
Mixed-layer LCL
606 m above ground
0-6 km bulk shear
36 kt
0-1 km storm-relative helicity
134 m²/s²
0-3 km storm-relative helicity
111 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.9

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 WarningSHVNatchitoches, Winn4 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, 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.