Alert archive / Louisiana / Flash Flood Warnings in 1998

Flash Flood Warning 1, NWS Lake Charles, LA

January 4, 1998Avoyelles Parish, Saint Landry Parish, Louisiana

NWS Lake Charles, LA issued this flash flood warning at Jan 4, 1998, 9:30 PM CST for Avoyelles Parish, Saint Landry Parish, Louisiana. It was in force for 3 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 4, 1998, 9:30 PM CST (03:30 UTC)
Expired
Jan 5, 1998, 12:00 AM CST
In force
3 hr
Issued by
NWS Lake Charles, LA
Area
Whole counties

Counties Avoyelles Parish, LA, Saint Landry Parish, LA

The radar

The Ft Polk radar (KPOE), 99 km from the middle of the area, began a volume at 03:31 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

Slidell Radar S, LA (KSIL), launched 00:00Z, 3.5 hours before the alert went out and 230 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, Slidell Radar S, LA at 00:00Z on 1998-01-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 51 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, Slidell Radar S, LA at 00:00Z on 1998-01-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 42 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
51 J/kg
Mixed-layer CIN
-45 J/kg
Mixed-layer LCL
519 m above ground
0-6 km bulk shear
16 kt
0-1 km storm-relative helicity
42 m²/s²
0-3 km storm-relative helicity
102 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 050332
FFWLCH
LAC009-097-050625-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LAKE CHARLES LA
930 PM CST SUN JAN 4 1998

THE NATIONAL WEATHER SERVICE IN LAKE CHARLES LA HAS ISSUED A
FLASH FLOOD WARNING EFFECTIVE UNTIL MIDNIGHT
FOR PEOPLE IN THE FOLLOWING LOCATIONS...

IN EAST CENTRAL LOUISIANA

   ...EASTERN AVOYELLES PARISH

IN SOUTH CENTRAL LOUISIANA

   ...EASTERN ST. LANDRY PARISH

AT 925 PM DOPPLER RADAR ESTIMATES INDICATE UP TO 4 INCHES OF RAIN
HAD ALREADY FALLEN IN EASTERN AVOYELLES AND EASTERN ST LANDRY
PARISHES. THESE AREAS CAN EXPECT ADDITIONAL AMOUNTS OF 1 TO
3 INCHES OF RAIN BEFORE MIDNIGHT. HIGHWAYS 107...115 AND 114
WERE REPORTED TO HAVE WATER COVERING THE ROADWAY.



BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE
THE DANGERS OF FLOODS. IF FLASH FLOODING IS OBSERVED...ACT QUICKLY.
DO NOT STAY IN AREAS SUBJECT TO FLOODING WHEN WATER BEGINS RISING.
IT IS VERY DIFFICULT AT NIGHT TO TELL HOW MUCH WATER IS ON ROADS.
MOTORISTS SHOULD NOT DRIVE THROUGH WATER OF UNKNOWN DEPTH.

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 Jan 4, 7:38 PM CST, 1 hour 52 minutes earlier.

Area forecast discussion, Jan 4, 7:38 PM CST, 1 hour 52 minutes before
SOUTHEAST TEXAS..SOUTHWEST AND CENTRAL LOUISIANA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LAKE CHARLES LA
738 PM CST SUN JAN 4 1998

IR STLT LOOP SHOWING S/WV ROTATING THRU SE TX ATTM. SHOULD SEE A DECR
IN RAIN COVERAGE AND INTENSITY FOR SE TX AND SW LA SO BLV WE CAN LWR
POPS A BIT AND TAKE OUT THE HVY RAIN FOR THOSE LOCATIONS TNITE. CAN
DROP HVY RAIN FM CEN LA ZNS AFT 9 PM...LOOKING AT RECEDING EDGE OF
THE HVY PCPN ON 88-D. CAN KEEP POPS UP FOR CEN LA AS IT LKS LIKE
S/WV WL PASS ARND MIDNITE. SINCE S/WV LKS TO PASS LFT AFT 2 AM...
AND 88-D SHOWING MORE HVY SHOWERS COMING ONSHORE TO VERMILION PARISH
...CAN KEEP POPS AND HVY RAIN FOR S CEN LA. COULD MENTION DIMINISHING
LATE. TEMPS LOOK OK.
11

BPT 61/69/60/68 5555
LCH 61/69/60/68 5555
LFT 61/70/60/68 7555 (LOCALLY HVY RAIN TNITE)
AEX 59/66/60/67 7555 (LOCALLY HVY RAIN TNITE)

The office that day

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

IssuedProductOfficeCountiesLasted
Jan 5, 2:17 AM CSTFlash Flood WarningLCHLafayette, Vermilion2 hr
Jan 5, 2:17 AM CSTFlash Flood WarningLCHSaint Martin2 hr

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.