Alert archive / Louisiana / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 328, NWS Shreveport, LA

August 5, 1998Caddo Parish, Louisiana

NWS Shreveport, LA issued this severe thunderstorm warning at Aug 5, 1998, 4:38 PM CDT for Caddo Parish, Louisiana. It was in force for 47 min. 5 reports came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued: Aug 5, 1998, 4:38 PM CDT (21:38 UTC)
Expired: Aug 5, 1998, 5:25 PM CDT
In force: 47 min
Issued by: NWS Shreveport, LA
Area: Whole counties

County Caddo Parish, LA

The radar

The Shreveport radar (KSHV), 15 km from the middle of the area, began a volume at 21:40 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.

What was reported inside it

Time	Report	Where	Remark
Aug 5, 4:44 PM CDT	Thunderstorm Wind 61	Shreveport, LA	Six power poles were toppled at I-49 and Bert Kouns road. I-49 was closed due to hot powerlines across the roads. Numerous trees were also toppled along I-49 and Linwood Ave.
Aug 5, 4:45 PM CDT	Hail 0.75	Shreveport, LA
Aug 5, 4:45 PM CDT	Hail 0.88	Shreveport, LA
Aug 5, 4:52 PM CDT	Thunderstorm Wind 52	Shreveport, LA
Aug 5, 5:05 PM CDT	Thunderstorm Wind 57	Shreveport, LA	Several large trees down.

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

The nearest sounding before it

Shreveport, LA (KSHV), launched 12:00Z, 9.6 hours before the alert went out and 17 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: 304 J/kg
Mixed-layer CIN: -124 J/kg
Mixed-layer LCL: 1280 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: 41 m²/s²
0-3 km storm-relative helicity: 24 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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.

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 Aug 5, 2:30 PM CDT, 2 hours 8 minutes earlier.

Area forecast discussion, Aug 5, 2:30 PM CDT, 2 hours 8 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SHREVEPORT LA
230 PM CDT WED AUG 5 1998

UPPER TROF OVER UPPER MISSISSIPPI RIVER VALLEY PROGGED TO SHARPEN
THRU THE PERIOD. THIS WILL ENABLE FRONTAL BOUNDARY ACROSS NW AR/SE OK
TO AROUND FTW TO LOCK INTO PLACE...AS WELL AS PROVIDE ADDITIONAL ENERGY
TO AREA AS 30-40 KT NORTHERLY WINDS FILTER DOWN BACKSIDE OF TROF.
ALTHOUGH MAIN BOUNDARY TO NORTH AND WEST OF AREA...NORTHERLY FLOW ALOFT
SHOULD STEER OUTFLOW BOUNDARIES TOWARDS AREA...ADDING TO LEFTOVER
BOUNDARIES FROM ONGOING CONVECTION. ETA SHOWS LIFT THIS AFTERNOON ENDING
THIS EVENING...BUT DEEPER LIFT THU AFTERNOON REMAIN ONGOING THRU THE
NIGHT. FAN/FWC BOTH RUNNING 30-50% POPS 2ND-4TH PERIOD WITH LOWERING
DAYTIME TEMPS...GOOD SIGN FOR RELIEF FROM HOT AND DRY. FWC TEMPS BETTER
WHILE FAN POPS MAY BE CLOSER.

SHV 73/92/73/90  2434          MLU 72/91/72/89  1323    07

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 5, 3:30 PM CDT	Severe Thunderstorm Warning	SHV	Cass	50 min
Aug 5, 3:44 PM CDT	Severe Thunderstorm Warning	SHV	Smith	51 min
Aug 5, 4:25 PM CDT	Severe Thunderstorm Warning	SHV	Cass	35 min
Aug 5, 4:54 PM CDT	Severe Thunderstorm Warning	SHV	Panola	51 min
Aug 5, 4:45 PM CDT	Severe Thunderstorm Warning	SHV	Bossier	50 min
Aug 5, 4:50 PM CDT	Severe Thunderstorm Warning	SHV	Webster	50 min
Aug 5, 5:28 PM CDT	Severe Thunderstorm Warning	SHV	Caddo	47 min
Aug 5, 5:34 PM CDT	Severe Thunderstorm Warning	SHV	De Soto	66 min

Nearby

Severe Thunderstorm Warnings in Louisiana, 1998 Every severe thunderstorm 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.