Alert archive / Texas / Tornado Warnings in 1999

Tornado Warning 51, NWS Shreveport, LA

May 4, 1999Wood County, Texas

NWS Shreveport, LA issued this tornado warning at May 4, 1999, 2:05 PM CDT for Wood County, Texas. It was in force for 40 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
May 4, 1999, 2:05 PM CDT (19:05 UTC)
Expired
May 4, 1999, 2:45 PM CDT
In force
40 min
Issued by
NWS Shreveport, LA
Area
Whole counties

County Wood County, TX

The radar

The Shreveport radar (KSHV), 149 km from the middle of the area, began a volume at 19:05 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.

IssuedProductOfficeLasted
May 4, 11:00 AM CDTTornado WatchSPC5 hr

The nearest sounding before it

Shreveport, LA (KSHV), launched 12:00Z, 7.1 hours before the alert went out and 157 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°0°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

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 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, 4 hours 5 minutes earlier.

Area forecast discussion, May 4, 10:00 AM CDT, 4 hours 5 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 55 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, 1:32 PM CDTTornado WarningSHVFranklin, Red River48 min
May 4, 1:38 PM CDTTornado WarningSHVSmith47 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
May 4, 4:41 PM CDTSevere Thunderstorm WarningSHVCaddo49 min
May 4, 5:04 PM CDTTornado WarningSHVCaddo46 min
May 4, 5:21 PM CDTTornado WarningSHVBossier49 min
May 4, 3:14 PM CDTTornado WarningSHVLittle River46 min
May 4, 3:47 PM CDTTornado WarningSHVSevier63 min
May 4, 3:59 PM CDTTornado WarningSHVHoward61 min
May 4, 4:37 PM CDTSevere Thunderstorm WarningSHVHempstead, Lafayette63 min
May 4, 5:00 PM CDTTornado WarningSHVHempstead, Nevada50 min
May 4, 5:43 PM CDTTornado WarningSHVLafayette47 min
May 4, 6:03 PM CDTTornado WarningSHVColumbia47 min
May 4, 6:56 PM CDTTornado WarningSHVColumbia49 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.