Alert archive / Louisiana / Tornado Warnings in 1990

Tornado Warning 21, NWS Shreveport, LA

May 16, 1990Union Parish, Louisiana

NWS Shreveport, LA issued this tornado warning at May 16, 1990, 7:37 PM CDT for Union Parish, Louisiana. It was in force for 83 min. 1 report 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: May 16, 1990, 7:37 PM CDT (00:37 UTC)
Expired: May 16, 1990, 9:00 PM CDT
In force: 83 min
Issued by: NWS Shreveport, LA
Area: Whole counties

County Union 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	Remark
May 16, 7:45 PM CDT	Tornado F1	Union, 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, 0.6 hours before the alert went out and 215 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: 2570 J/kg
Mixed-layer CIN: -8 J/kg
Mixed-layer LCL: 1057 m above ground
0-6 km bulk shear: 48 kt
0-1 km storm-relative helicity: 169 m²/s²
0-3 km storm-relative helicity: 303 m²/s²
Significant tornado parameter: 4.1
Supercell composite: 18.0

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KSHV 170039
TORSHV
LAC111-170200-
 
BULLETIN - EBS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE SHREVEPORT LA
737 PM CDT WED MAY 16 1990
 
THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A
TORNADO WARNING EFFECTIVE UNTIL  900 PM CDT
FOR PEOPLE IN THE FOLLOWING LOCATIONS..
 
IN NORTHEAST LOUISIANA
 
   ...NORTHERN UNION PARISH
 
AT 737 PM CDT WEATHER SERVICE RADAR IN SHREVEPORT SHOWED A POSSIBLE
TORNADO ALONG THE ARKANSAS/LOUISIANA STATE LINE NORTH OF SPEARSVILLE
LOUISIANA IN NORTH UNION PARISH. MOVEMENT WAS TO THE EAST SOUTHEAST
AT 35 MPH.
 
 
IF YOU ARE CAUGHT OUTSIDE...SEEK SHELTER IN A NEARBY REINFORCED
BUILDING.  AS A LAST RESORT...SEEK SHELTER IN A CULVERT...DITCH
OR #LOW SPOT AND COVER YOUR HEAD WITH YOUR HANDS.

The office that day

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

Issued	Product	Office	Counties	Lasted
May 16, 10:11 PM CDT	Severe Thunderstorm Warning	SHV	Caddo	94 min
May 16, 10:11 PM CDT	Severe Thunderstorm Warning	SHV	Bossier	94 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.