Alert archive / Louisiana / Tornado Warnings in 1990

Tornado Warning 9, NWS Shreveport, LA

April 27, 1990Bossier Parish, Caddo Parish, Louisiana

NWS Shreveport, LA issued this tornado warning at Apr 27, 1990, 7:23 PM CDT for Bossier Parish, Caddo Parish, Louisiana. It was in force for 67 min. 7 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: Apr 27, 1990, 7:23 PM CDT (00:23 UTC)
Expired: Apr 27, 1990, 8:30 PM CDT
In force: 67 min
Issued by: NWS Shreveport, LA
Area: Whole counties

Counties Bossier Parish, LA, Caddo Parish, LA

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

What was reported inside it

Time	Report	Where
Apr 27, 7:24 PM CDT	Tornado F1	Caddo, LA
Apr 27, 7:26 PM CDT	Tornado F1	Caddo, LA
Apr 27, 7:48 PM CDT	Tornado F1	Caddo, LA
Apr 27, 8:10 PM CDT	Hail 2.75	Caddo, LA
Apr 27, 8:25 PM CDT	Tornado F1	Bossier, LA
Apr 27, 8:28 PM CDT	Hail 1.75	Caddo, LA
Apr 27, 8:36 PM CDT	Tornado F1	Bossier, LA

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. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.

The nearest sounding before it

Longview/Gregg, TX (KGGG), launched 00:00Z, 0.4 hours before the alert went out and 86 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: 1368 J/kg
Mixed-layer CIN: -7 J/kg
Mixed-layer LCL: 1155 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 21 m²/s²
0-3 km storm-relative helicity: 83 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.1

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KSHV 280024 RRA
TORSHV
LAC015-017-280130-
 
BULLETIN - EBS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE SHREVEPORT LA
723 PM CDT FRI APR 27 1990
 
THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A
TORNADO WARNING EFFECTIVE UNTIL  830 PM CDT
FOR PEOPLE IN THE FOLLOWING LOCATIONS..
 
IN NORTHWEST LOUISIANA
 
   ...BOSSIER PARISH...CADDO PARISH
 
A VISUAL SIGHTING OF A TORNADO HAS BEEN REPORTED NEAR LATEX LOUISIANA
IN NORTHERN CADDO PARISH..LATEX IS ABOUT 7 MILES NORTHWEST OF
SHREVEPORT LOUISIANA. THE STORM CONTAINING THE TORNADO WAS MOVING
TO THE EAST 15 MPH.

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 27, 7:38 PM CDT	Tornado Warning	SHV	De Soto	97 min
Apr 27, 8:05 PM CDT	Tornado Warning	SHV	Sabine	85 min
Apr 27, 8:32 PM CDT	Tornado Warning	SHV	Bossier, Caddo	58 min
Apr 27, 8:42 PM CDT	Tornado Warning	SHV	Bienville, Red River, Webster	63 min
Apr 27, 8:51 PM CDT	Severe Thunderstorm Warning	SHV	Natchitoches	69 min
Apr 27, 9:20 PM CDT	Severe Thunderstorm Warning	SHV	Claiborne, Lincoln	55 min
Apr 27, 9:20 PM CDT	Severe Thunderstorm Warning	SHV	Jackson, Winn	55 min
Apr 27, 10:47 PM CDT	Severe Thunderstorm Warning	SHV	Franklin, Madison, Tensas	58 min

Nearby

Tornado Warnings in Louisiana, 1990 Every tornado warning in 1990 Tornadoes in 1990

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.