Alert archive / Louisiana / Flash Flood Warnings in 1999

Flash Flood Warning 9, NWS Shreveport, LA

January 28, 1999Bienville Parish, De Soto Parish, Red River Parish, Louisiana

NWS Shreveport, LA issued this flash flood warning at Jan 28, 1999, 11:21 PM CST for Bienville Parish, De Soto Parish, Red River Parish, Louisiana. It was in force for 2 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Jan 28, 1999, 11:21 PM CST (05:21 UTC)
Expired
Jan 29, 1999, 1:45 AM CST
In force
2 hr
Issued by
NWS Shreveport, LA
Area
Whole counties

Counties Bienville Parish, LA, De Soto Parish, LA, Red River Parish, LA

The radar

The Shreveport radar (KSHV), 54 km from the middle of the area, began a volume at 05:22 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

Shreveport, LA (KSHV), launched 00:00Z, 5.4 hours before the alert went out and 49 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, Shreveport, LA at 00:00Z on 1999-01-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Shreveport, LA at 00:00Z on 1999-01-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -61 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
672 m above ground
0-6 km bulk shear
19 kt
0-1 km storm-relative helicity
-61 m²/s²
0-3 km storm-relative helicity
183 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
TTAA00 KSHV 290523
FFWSHV
LAC013-027-031-081-290745-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SHREVEPORT LA
1121 PM CST THU JAN 28 1999

THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  WESTERN AND NORTHERN BIENVILLE PARISH IN NORTHWESTERN LOUISIANA
  CLAIBORNE PARISH IN NORTHWESTERN LOUISIANA
  DE SOTO PARISH IN NORTHWESTERN LOUISIANA
  WESTERN RED RIVER PARISH IN NORTHWESTERN LOUISIANA

* UNTIL 145 AM CST

* AT 1120 PM CST... THE SHREVEPORT NATIONAL WEATHER SERVICE DOPPLER
  RADAR INDICATED A BAND OF SHOWERS AND THUNDERSTORMS WITH VERY HEAVY
  RAIN EXTENDING FROM DE SOTO PARISH NORTHEASTWARD TO CLAIBORNE
  PARISH. MOVEMENT OF INDIVIDUAL STORMS WAS NORTHEAST AT 35 MPH WHILE
  THE OVERALL AREA OF RAIN WAS DRIFTING EAST AT 5 TO 10 MPH. AS A
  RESULT OF THIS MOTION...HEAVY RAIN HAS REPEATEDLY AFFECTED THE
  SAME AREAS. RAINFALL IN EXCESS OF ONE INCH AN HOUR IS LIKELY.


DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO
CROSS SAFELY AND THE ROAD BENEATH MAY BE WASHED OUT.

What forecasters said that day

The local office's own words before this flash flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Shreveport, LA wrote its last area forecast discussion before this flash flood warning went out at Jan 28, 9:12 PM CST, 2 hours 9 minutes earlier.

Area forecast discussion, Jan 28, 9:12 PM CST, 2 hours 9 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SHREVEPORT LA
912 PM CST THU JAN 28 1999

LOOKING AT SLOWLY PROPAGATING SYSTEM OVER EASTERN TEXAS. SHOWERS
STREAMING NORTH OUT OF GULF INTO SOUTHWEST LA AND SOUTHEAST TX. WILL
BE INTERESTED IN WATCHING THE MERGER OF THE ACTIVITY TO THE SOUTH
WITH THE LARGER AREA OF RAIN OVER US NOW. SYNOTPIC SITUATION HANDLED
WELL BY DAYSHIFTERS AND FORECASTS LOOK GOOD. RAIN WITH INTERMITTENT
BREAKS THROUGH FRIDAY NIGHT. CHANCE OF RAIN INTO SATURDAY. FLASH
FLOOD WATCH CONTINUES... 3-4 INCHES OF RAIN WIDESPREAD ACROSS AREA
ALREADY. HEAVIEST RAIN AREA SHIFTING TO DESOTO PARISH-CLAIBORNE PARISH
LINE WITH WARNINGS IN EFFECT UNTIL 1105 PM THERE. 17

The office that day

Everything else NWS Shreveport, LA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jan 28, 8:36 PM CSTFlash Flood WarningSHVBossier, Claiborne, Webster2 hr
Jan 28, 8:36 PM CSTFlash Flood WarningSHVCaddo, De Soto2 hr
Jan 28, 11:21 PM CSTFlash Flood WarningSHVClaiborne2 hr
Jan 29, 12:46 AM CSTFlash Flood WarningSHVSabine4 hr
Jan 29, 5:27 AM CSTFlash Flood WarningSHVNatchitoches, Sabine, Winn5 hr
Jan 29, 7:48 AM CSTFlash Flood WarningSHVCaddo, De Soto3 hr
Jan 29, 7:48 AM CSTFlash Flood WarningSHVBossier3 hr
Jan 29, 8:01 AM CSTFlash Flood WarningSHVJackson, Ouachita3 hr
Jan 29, 8:12 AM CSTFlash Flood WarningSHVBienville, Claiborne, Webster3 hr
Jan 29, 8:12 AM CSTFlash Flood WarningSHVRed River3 hr
Jan 29, 10:02 AM CSTFlash Flood WarningSHVNatchitoches, Sabine4 hr
Jan 29, 10:02 AM CSTFlash Flood WarningSHVWinn4 hr
Jan 29, 11:01 AM CSTFlash Flood WarningSHVJackson, Lincoln, Ouachita, Union3 hr
Jan 29, 11:01 AM CSTFlash Flood WarningSHVGrant3 hr
Jan 29, 11:01 AM CSTFlash Flood WarningSHVCaldwell3 hr
Jan 29, 2:01 PM CSTFlash Flood WarningSHVCaldwell, Grant, LaSalle, Natchitoches, Winn4 hr
Jan 29, 2:01 PM CSTFlash Flood WarningSHVSabine4 hr

Nearby

Flash Flood Warnings in Louisiana, 1999Every flash flood 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.