Alert archive / Louisiana / Flash Flood Warnings in 1998

Flash Flood Warning 48, NWS Lake Charles, LA

August 30, 1998Saint Landry Parish, Louisiana

NWS Lake Charles, LA issued this flash flood warning at Aug 30, 1998, 11:51 AM CDT for Saint Landry Parish, Louisiana. It was in force for 114 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Aug 30, 1998, 11:51 AM CDT (16:51 UTC)
Expired
Aug 30, 1998, 1:45 PM CDT
In force
114 min
Issued by
NWS Lake Charles, LA
Area
Whole counties

County Saint Landry Parish, LA

The radar

The Ft Polk radar (KPOE), 111 km from the middle of the area, began a volume at 16:50 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

Lake Charles Mun, LA (KLCH), launched 12:00Z, 4.9 hours before the alert went out and 126 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 12:00Z on 1998-08-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2927 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 12:00Z on 1998-08-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 9 square meters per square second.1939Sfc1 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
2927 J/kg
Mixed-layer CIN
-30 J/kg
Mixed-layer LCL
906 m above ground
0-6 km bulk shear
6 kt
0-1 km storm-relative helicity
9 m²/s²
0-3 km storm-relative helicity
18 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 KLCH 301659 COR
FFWLCH
LAC097-301845-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING...CORRECT PM TO AM 1ST PARAGRAPH...
NATIONAL WEATHER SERVICE LAKE CHARLES LA
1151 AM CDT SUN AUG 30 1998

THE NATIONAL WEATHER SERVICE IN LAKE CHARLES HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  ST. LANDRY PARISH IN SOUTH CENTRAL LOUISIANA

* UNTIL 145 PM CDT

* AT 1150 AM...NATIONAL WEATHER SERVICE DOPPLER RADAR ESTIMATED THAT
  3 TO 4 INCHES OF RAIN HAS FALLEN FROM WOODSIDE TO WASHINGTON
  DURING THE PAST 1 HOUR. 1 TO 2 INCHES OF ADDITIONAL RAINFALL IS
  EXPECTED ACROSS THE AREA OVER THE NEXT 1 1/2 HOURS. EXPECT THE
  THUNDERSTORM ACTIVITY TO SLOWLY MOVE EASTWARD ACROSS THE
  CENTRAL AND EASTERN PORTIONS OF THE PARISH AFFECTING THE TOWNS OF
  PALMETTO AND OPELOUSAS.

* EXPECT FLOODING OF CREEKS... BAYOUS AND AND LOW LYING AREAS

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE WATER COVERS
THE ROAD TO UNKNOWN DEPTHS. THE DEPTH OF THE WATER MAY BE
TOO GREAT TO ALLOW YOUR CAR TO CROSS SAFELY. REMEMBER...MOST
FLOOD RELATED DEATHS OCCUR IN AUTOMOBILES.

MOGGED

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 Lake Charles, LA wrote its last area forecast discussion before this flash flood warning went out at Aug 30, 9:43 AM CDT, 2 hours 8 minutes earlier.

Area forecast discussion, Aug 30, 9:43 AM CDT, 2 hours 8 minutes before
SOUTHEAST TEXAS..SOUTHWEST AND CENTRAL LOUISIANA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LAKE CHARLES LA
943 AM CDT SUN AUG 30 1998

12Z SURFACE ANALYSIS DEPICTS A WEAK SURFACE LOW JUST WEST OF TYLER
TEXAS...WITH A SURFACE TROUGH EXTENDING EASTWARD INTO NORTHERN LA.
A BROAD AREA OF LOW PRESSURE WAS ALSO NOTED OVER THE WESTERN GULF OF
MEXICO...ASSOCIATED WITH A WESTWARD MOVING TROPICAL WAVE. MAIN CONCERN
THIS MORNING IS WITH CONVECTIVE COMPLEX THAT DEVELOPED NORTH OF THE
LCH CWA EARLY THIS MORNING AND RESIDUAL OUTFLOWS PROPAGATING
SOUTHWARD. IN ADDITION...LCH 12Z SOUNDING HAS BECOME INCREASINGLY LESS
STABLE...WITH AN LI OF -7...K-INDEX OF 28...AND CAPE OF 3900 J/KG.
THIS COMBINED WITH A WEAK SHEAR AXIS AT 50H ACROSS NORTHEAST TEXAS AND
NORTHERN LA AND THE PROXIMITY OF THE SURFACE TROUGH WILL WARRANT THE
CURRENT POPS FORECAST. MAY BE A TAD OVERDONE IN THE SOUTHERN ZONES...
BUT BASED ON THE INSTABILITY WILL LEAVE FOR NOW. LASTLY...PRELFER
PREVAILING WINDS TO BE OUT OF THE EAST (5 TO 10 MPH) WITH THE TROUGH
TO THE NORTH AND A BROAD AREA OF LOW PRESSURE OVER THE GULF OF
MEXICO.

5

BPT 97/76/93 314
LCH 97/75/93 314
LFT 97/74/93 314
AEX 98/72/94 423

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 30, 3:22 PM CDTSevere Thunderstorm WarningLCHAvoyelles, Rapides63 min
Aug 30, 4:39 PM CDTSevere Thunderstorm WarningLCHCalcasieu61 min

Nearby

Flash Flood Warnings in Louisiana, 1998Every flash flood warning in 1998

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.