Alert archive / Louisiana / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 86, NWS Shreveport, LA

April 4, 1997Webster Parish, Louisiana

NWS Shreveport, LA issued this severe thunderstorm warning at Apr 4, 1997, 4:48 PM CST for Webster Parish, Louisiana. It was in force for 27 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: Apr 4, 1997, 4:48 PM CST (22:48 UTC)
Expired: Apr 4, 1997, 5:15 PM CST
In force: 27 min
Issued by: NWS Shreveport, LA
Area: Whole counties

County Webster Parish, LA

The radar

The Shreveport radar (KSHV), 56 km from the middle of the area, began a volume at 22:51 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Apr 4, 4:00 PM CST	Tornado Watch	SPC	6 hr

The nearest sounding before it

Shreveport, LA (KSHV), launched 12:00Z, 10.8 hours before the alert went out and 47 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 533 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 154 m²/s²
0-3 km storm-relative helicity: 237 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KSHV 042248 RRA
SVRSHV
LAC119-042315-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SHREVEPORT LA
448 PM CST FRI APR 4 1997
 
THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  515 PM CST
FOR THE FOLLOWING AREA...
 
IN NORTHWEST LOUISIANA
 
   ...NORTHERN WEBSTER PARISH
 
AT 445 PM...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM WITH WINDS OF
UP TO 70 MPH JUST SOUTH OF SPRING HILL. THIS THUNDERSTORM WAS MOVING
NORTH NORTHEAST AT 40 MPH.
 
A TORNADO WATCH IS ALSO IN EFFECT FOR THE WARNED AREA.  REMEMBER
SEVERE THUNDERSTORMS CAN AND SOMETIMES DO PRODUCE TORNADOES
WITH LITTLE OR NO ADVANCE WARNING.
 
3
 
 
 &

What forecasters said that day

The local office's own words before this severe thunderstorm 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 severe thunderstorm warning went out at Apr 4, 2:30 PM CST, 2 hours 18 minutes earlier.

Area forecast discussion, Apr 4, 2:30 PM CST, 2 hours 18 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SHREVEPORT LA
230 PM CST FRI APR 4 1997

NOT MUCH TIME THIS AFTERNOON WITH ACTIVITY STARTING TO POP ACROSS W
HALF OF CWA. COORD WITH NEW AND THE POSSIBILITY OF PRE-FRONTAL
HEAVY RAINFALL TONIGHT AND HEAVY RAINFALL IN ASSOCIATION WITH SQUALL
LINE DURING THE EARLY MORNING HOURS SAT...WILL ISSUE FLASH FLOOD WATCH
FOR NW HALF OF LA WEST OF A LINE FROM JUNCTION CITY TO CYPRESS LA.
HAVE DECIDED NOT TO INCLUDE NORTHEAST LOUISIANA IN FFA DUE TO EXPECTED
ACCELERATION OF THE LINE AS IT MOVES FURTHER EAST. WOULD LIKE TO SEE
AT LEAST CHANCE POPS ACROSS NW HALF OF LA FOR SECOND PERIOD AND
WORD IT MAINLY TOWARDS MORNING BECAUSE OF UNCERTAINITY OF SQUALL
LINE PLACEMENT. MOS NUMBERS LOOK GOOD...MY NUMBERS TO FOLLOW...

SHV 64/76/53/72  +510     MLU 65/73/52/72  +630

13

In the hours before

Local storm report, Apr 4, 3:35 PM CST, 1 hour 13 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE OFFICE SHREVEPORT LA
335 PM CST FRI APR 4 1997

TIME(CST)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....

245 PM     2 W LUFKIN                TX   WIND DAMAGE
04/04/97   ANGELINA                       TREES DOWN ACROSS HWY 103

247 PM     2 NW LUFKIN               TX   WIND DAMAGE
04/04/97   ANGELINA                       TREES DOWN ACROSS I-69.

245 PM     POLLOCK                   TX   WIND DAMAGE
04/04/97   ANGELINA                       TREES DOWN ACROSS HWY 7.

305 PM     NACOGDOCHES               TX   WIND DAMAGE
04/04/97   NACODGOCHES                    SATELLITE DISH BLOWN OFF A
                                          LOCAL RADIO STATIONS BUILDING.
13

Special weather statement, Apr 4, 4:40 PM CST, 8 minutes before

ARZ050-051-059>061-070>073-LAZ001>006-010>014-017>022-OKZ077-TXZ096-
097-108>112-124>126-136>138-149>153-165>167-042340-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
440 PM CST FRI APR 4 1997

...A TORNADO WATCH IN EFFECT UNTIL 800 PM CST FOR PARTS OF NORTHEAST
TEXAS...
...A TORNADO WATCH IN EFFECT UNTIL 1000 PM CST FOR NORTH LOUISIANA
AND SOUTHWEST ARKANSAS...
...A FLASH FLOOD WATCH CONTINUED IN EFFECT THROUGH TONIGHT FOR
NORTHEAST TEXAS...
...A FLASH FLOOD WATCH CONTINUED IN EFFECT THROUGH TONIGHT FOR THE
WESTERN HALF OF NORTH LOUISIANA...
...A FLASH FLOOD WARNING CONTINUED IN EFFECT UNTIL 730 PM CST FOR
CADDO AND BOSSIER PARISHES IN NORTHWEST LOUISIANA...
...THE SEVERE THUNDERSTORM WARNING FOR DESOTO PARISH IN NORTHWEST
LOUISIANA HAS BEEN CANCELLED...
...A SEVERE THUNDERSTORM WARNING IN EFFECT UNTIL 500 PM CST FOR
CADDO AND BOSSIER PARISH IN NORTHWEST LOUISIANA...

AT 440 PM CST DOPPLER RADAR IN SHREVEPORT SHOWED AN AREA OF SHOWERS
AND THUNDERSTORMS OVER NORTHEAST TEXAS...SOUTHWEST ARKANSAS...AND
NORTH LOUISIANA GENERALLY EAST OF A LINE FROM NEAR DE QUEEN ARKANSAS
SOUTH TO NEAR LONGVIEW AND LUFKIN TEXAS. VERY HEAVY RAINFALL IN
THUNDERSTORMS OVER NORTHWEST LOUISIANA AND SOUTHWEST ARKANSAS
CONTINUED TO PRODUCE RAINFALL AMOUNTS IN EXCESS OF  1 1/2 TO 2 INCHES
PER HOUR WHICH HAS RESULTED IN FLOODING IN THE SHREVEPORT/BOSSIER
CITY METRO AREA.

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 4, 3:55 PM CST	Severe Thunderstorm Warning	SHV	De Soto	50 min
Apr 4, 4:11 PM CST	Severe Thunderstorm Warning	SHV	Bossier, Caddo	49 min
Apr 4, 4:23 PM CST	Flash Flood Warning	SHV	Bossier, Caddo	3 hr
Apr 4, 4:52 PM CST	Tornado Warning	SHV	Webster	38 min
Apr 4, 5:10 PM CST	Severe Thunderstorm Warning	SHV	Claiborne	50 min

Nearby

Severe Thunderstorm Warnings in Louisiana, 1997 Every severe thunderstorm warning in 1997

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.