Alert archive / Texas / Tornado Warnings in 1999

Tornado Warning 49, NWS Shreveport, LA

May 4, 1999Franklin County, Red River County, Texas

NWS Shreveport, LA issued this tornado warning at May 4, 1999, 1:32 PM CDT for Franklin County, Red River County, Texas. It was in force for 48 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 4, 1999, 1:32 PM CDT (18:32 UTC)
Expired
May 4, 1999, 2:20 PM CDT
In force
48 min
Issued by
NWS Shreveport, LA
Area
Whole counties

Counties Franklin County, TX, Red River County, TX

The radar

The Shreveport radar (KSHV), 160 km from the middle of the area, began a volume at 18:33 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

TimeReportWhereRemark
May 4, 2:04 PM CDTTornado F3Mt Vernon, TXSupercells developed in unstable airmass ahead of strong upper low over central plains states. Damage confined to broken branches off trees and snapped twigs. This tornado moved into Titus county, TX.

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 watch it was issued in

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

IssuedProductOfficeLasted
May 4, 11:00 AM CDTTornado WatchSPC5 hr

The nearest sounding before it

Shreveport, LA (KSHV), launched 12:00Z, 6.5 hours before the alert went out and 165 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, Shreveport, LA at 12:00Z on 1999-05-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1116 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Shreveport, LA at 12:00Z on 1999-05-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 275 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
1116 J/kg
Mixed-layer CIN
-31 J/kg
Mixed-layer LCL
498 m above ground
0-6 km bulk shear
38 kt
0-1 km storm-relative helicity
275 m²/s²
0-3 km storm-relative helicity
392 m²/s²
Significant tornado parameter
2.0
Supercell composite
12.5

Open this sounding in Storm Lab

The text

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

999 
WFUS1 KSHV 041834 RRA
TORSHV
TXC159-387-041920-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE SHREVEPORT LA
132 PM CDT TUE MAY 4 1999

THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A

* TORNADO WARNING FOR...
  FRANKLIN COUNTY IN NORTHEASTERN TEXAS
  RED RIVER COUNTY IN NORTHEASTERN TEXAS

* UNTIL 220 PM CDT

* AT AT 135 PM CDT... THE SHREVEPORT NATIONAL WEATHER SERVICE DOPPLER
  RADAR INDICATED A TORNADO 10 MILES SOUTHWEST OF BOGOTA TEXAS.  THE
  THUNDERSTORM CONTAINING THIS TORNADO WAS MOVING NORTHEAST NEAR 35
  MPH.

* THE TORNADO IS EXPECTED TO BE NEAR...
  CLARKSVILLE AT 155 PM
  BOGOTA AT 145 PM


THIS THUNDERSTORM CAN PRODUCE A TORNADO THAT IS OBSCURED BY
RAIN AND DIFFICULT TO SEE.  GO TO AN INTERIOR ROOM ON THE LOWEST
FLOOR OF YOUR HOME OR BUSINESS.

What forecasters said that day

The local office's own words before this tornado 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 tornado warning went out at May 4, 10:00 AM CDT, 3 hours 32 minutes earlier.

Area forecast discussion, May 4, 10:00 AM CDT, 3 hours 32 minutes before
FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SHREVEPORT LA
1000 AM CDT TUE MAY 4 1999

CURRENT FORECAST STILL ON TRACK. LATEST ETA RUN SHOWS MID LEVEL JET
KICKING IN AROUND 18Z OVER CWA. ONLY SAVING GRACE AT THIS TIME IS
THE CLOUD COVER...WHICH IS HELPING TO HOLD STABILITY DOWN A TAD AS
WELL AS SURFACE WIND BELOW WIND ADVISORY THRESHOLD. THIS MAY CHANGE
IF LARGE UNANTICIPATED BREAKS OCCUR. BUT UNTIL ANY UNFORESEEN CHANGES
OCCUR..FORECAST CAN CONTINUE AS IS.

14

In the hours before

Special weather statement, May 4, 10:10 AM CDT, 3 hours 22 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>167-041630-

THUNDERSTORM OUTLOOK
NATIONAL WEATHER SERVICE SHREVEPORT LA
1010 AM CDT TUE MAY 4 1999

...AN OUTBREAK OF SEVERE WEATHER COULD AFFECT MOST OF THE THE
FOUR STATE REGION TODAY AND TONIGHT...

THERE IS HIGH RISK OF SEVERE THUNDERSTORMS TODAY AND TONIGHT FOR ALL
OF NORTHEAST TEXAS...NORTH LOUISIANA...SOUTHERN ARKANSAS AND
MC CURTAIN COUNTY IN SOUTHEAST OKLAHOMA.  THE AIRMASS ACROSS THE
AREA IS MOIST AND UNSTABLE.  A STRONG UPPER LEVEL STORM SYSTEM WILL
MOVE ACROSS THE CENTRAL PLAINS TODAY AND TONIGHT.  THUNDERSTORMS
WILL LIKELY DEVELOP ACROSS NORTHEAST TEXAS AND SOUTHERN OKLAHOMA BY
EARLY THIS AFTERNOON AND CONTINUE THROUGH THE EVENING HOURS.

WINDS IN THE LOWER LEVELS OF THE ATMOSPHERE REMAIN FAVORABLE FOR THE
DEVELOPMENT OF ROTATING STORMS. THEREFORE THE THREAT WILL EXIST FOR
A FEW TORNADOES IN ADDITION TO LARGE HAIL AND DAMAGING STRAIGHT LINE
WIND.

THIS IS A POTENTIALLY DANGEROUS WEATHER SITUATION. RESIDENTS IN THE
FOUR STATE REGION ARE URGED TO REVIEW SEVERE WEATHER SAFETY RULES AND
TO LISTEN TO RADIO...TELEVISION AND NOAA WEATHER RADIO FOR POSSIBLE
WATCHES...WARNINGS AND STATEMENTS LATER TODAY.

ACTIVATION OF STORM SPOTTERS...EMERGENCY MANAGEMENT OFFICIALS AND
HAM RADIO OPERATORS WILL LIKELY BE REQUIRED THIS AFTERNOON AND
TONIGHT.

14

The office that day

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

IssuedProductOfficeCountiesLasted
May 4, 2:35 AM CDTSevere Thunderstorm WarningSHVRed River45 min
May 4, 1:38 PM CDTTornado WarningSHVSmith47 min
May 4, 2:05 PM CDTTornado WarningSHVWood40 min
May 4, 2:05 PM CDTTornado WarningSHVTitus45 min
May 4, 2:20 PM CDTTornado WarningSHVUpshur40 min
May 4, 2:33 PM CDTTornado WarningSHVRed River47 min
May 4, 2:45 PM CDTTornado WarningSHVBowie45 min
May 4, 3:01 PM CDTTornado WarningSHVGregg, Rusk39 min
May 4, 3:29 PM CDTTornado WarningSHVHarrison61 min
May 4, 4:03 PM CDTTornado WarningSHVCass47 min
May 4, 4:48 PM CDTSevere Thunderstorm WarningSHVWood62 min
May 4, 5:06 PM CDTTornado WarningSHVWood49 min
May 4, 5:46 PM CDTSevere Thunderstorm WarningSHVSmith64 min
May 4, 6:26 PM CDTTornado WarningSHVSmith64 min

Nearby

Tornado Warnings in Texas, 1999Every tornado warning in 1999Tornadoes in 1999

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.