Alert archive / Texas / Tornado Warnings in 1999

Tornado Warning 80, NWS Shreveport, LA

December 4, 1999Harrison County, Texas

NWS Shreveport, LA issued this tornado warning at Dec 4, 1999, 3:05 PM CST for Harrison County, Texas. It was in force for 40 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: Dec 4, 1999, 3:05 PM CST (21:05 UTC)
Expired: Dec 4, 1999, 3:45 PM CST
In force: 40 min
Issued by: NWS Shreveport, LA
Area: Whole counties

County Harrison County, TX

What was reported inside it

Time	Report	Where	Remark
Dec 4, 3:20 PM CST	Tornado F1	Marshall, TX	In southwest Marshall from just southeast of West Pinecrest Drive (hwy 43) and just east of West End Blvd to South Washington Ave to just west of East End Blvd (Hwy 59). Eyewitnesses indicated tornado was heavily rain wrapped, fast moving and very difficult t

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.

Issued	Product	Office	Lasted
Dec 4, 11:00 AM CST	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Shreveport, LA (KSHV), launched 12:00Z, 9.1 hours before the alert went out and 59 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: 143 J/kg
Mixed-layer CIN: -25 J/kg
Mixed-layer LCL: 602 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 348 m²/s²
0-3 km storm-relative helicity: 374 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.1

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KSHV 042104 RRA
TORSHV
TXC203-042145-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE SHREVEPORT LA
305 PM CST SAT DEC 4 1999

THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A

* TORNADO WARNING FOR...
  HARRISON COUNTY IN NORTHEASTERN TEXAS

* UNTIL 345 PM CST

* AT 300 PM CST... THE SHREVEPORT NATIONAL WEATHER SERVICE DOPPLER
  RADAR INDICATED A TORNADO JUST SOUTH OF MARSHALL.  THE
  THUNDERSTORM CONTAINING THIS TORNADO WAS MOV8ING NORTHEAST AT 40
  MPH.

* PEOPLE IN MARSHALL TAKE IMMEDIATE SHELTER...

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 Dec 4, 10:30 AM CST, 4 hours 35 minutes earlier.

Area forecast discussion, Dec 4, 10:30 AM CST, 4 hours 35 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SHREVEPORT LA
1030 AM CST SAT DEC 4 1999

PRETTY GOOD MORNING FORECAST HAS THINGS HANDLED WELL...I HAVE
OFFERED SOME SLIGHT MODIFICATIONS. REMOVED MORNING PERIOD...RAISED
TEMPS TO 75 TO 80 RANGE EAST AND SOUTH TODAY...LOWERED THE UPPER 70S
OUT WEST TO MID 70S. ALTERED POPS SLIGHTLY. REARRANGED ZONES TO THE
FOLLOWING ORDER... NW..N..NE..SW..S..SE..FAR S. SLIGHT RISK STILL IN
EFFECT. LETS GET READY TO RUMBLE.   17

.SHV...CAUTION ON AREA LAKES ALL ZONES THROUGH PERIOD.

The office that day

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

Issued	Product	Office	Counties	Lasted
Dec 4, 11:45 AM CST	Severe Thunderstorm Warning	SHV	Wood	30 min
Dec 4, 12:47 PM CST	Severe Thunderstorm Warning	SHV	Camp, Titus	33 min
Dec 4, 1:12 PM CST	Severe Thunderstorm Warning	SHV	Morris	33 min
Dec 4, 1:30 PM CST	Severe Thunderstorm Warning	SHV	Cass	60 min
Dec 4, 1:36 PM CST	Tornado Warning	SHV	Bowie, Cass	64 min
Dec 4, 2:08 PM CST	Severe Thunderstorm Warning	SHV	Bowie	47 min
Dec 4, 2:51 PM CST	Severe Thunderstorm Warning	SHV	Harrison	44 min

Nearby

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