Alert archive / Texas / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 352, NWS Shreveport, LA

December 4, 1999Morris County, Texas

NWS Shreveport, LA issued this severe thunderstorm warning at Dec 4, 1999, 1:12 PM CST for Morris County, Texas. It was in force for 33 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: Dec 4, 1999, 1:12 PM CST (19:12 UTC)
Expired: Dec 4, 1999, 1:45 PM CST
In force: 33 min
Issued by: NWS Shreveport, LA
Area: Whole counties

County Morris County, TX

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, 7.2 hours before the alert went out and 116 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

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 severe thunderstorm 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 severe thunderstorm warning went out at Dec 4, 10:30 AM CST, 2 hours 42 minutes earlier.

Area forecast discussion, Dec 4, 10:30 AM CST, 2 hours 42 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.

In the hours before

Special weather statement, Dec 4, 9:00 AM CST, 4 hours 12 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>167-041700-

THUNDERSTORM OUTLOOK
NATIONAL WEATHER SERVICE SHREVEPORT LA
900 AM CST SAT DEC 4 1999

...SLIGHT RISK OF SEVERE WEATHER ACROSS THE FOUR STATE AREA...

UNUSUALLY WARM AND MOIST AIR IS IN PLACE ACROSS THE FOUR STATE AREA.
OUT TO OUR WEST...A POTENT UPPER LEVEL STORM SYSTEM ENTERING WEST
TEXAS...AND A STRONG COLD FRONT DRAPED NORTH TO SOUTH ACROSS CENTRAL
TEXAS...WILL BOTH MOVE EASTWARD. A LINE OF THUNDERSTORMS...SOME
POSSIBLY SEVERE...WILL ACCOMPANY THE COLD FRONT AS IT MOVES THROUGH
OUR REGION TODAY. IN ADDITION...WIDELY SCATTERED SHOWERS AND
THUNDERSTORMS WILL BE POSSIBLE TODAY...WELL TO THE EAST OF THE COLD
FRONT.

NEAR THE FRONT...SURFACE WINDS WILL BLOW FROM THE SOUTHEAST WHILE
WINDS ABOVE THE SURFACE WILL HAVE AN INCREASINGLY SOUTHWEST
COMPONENT. THIS VEERING WIND PATTERN ALOFT...COMBINED WITH THE
STRONG FRONTAL LIFTING MECHANISM...PROVIDES THE RISK THAT SOME
THUNDERSTORMS TODAY AND THIS EVENING COULD BECOME SEVERE.

THE COLD FRONT WILL APPROACH TYLER TEXAS BY THE AFTERNOON...
SHREVEPORT BY SUNSET...AND MONROE LATER TONIGHT.

ACTIVATION OF STORM SPOTTER NETWORKS...HAM RADIO OPERATORS...AND
EMERGENCY MANAGERS SHOULD BE EXPECTED TODAY AND TONIGHT.

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, 1:30 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
Dec 4, 3:05 PM CST	Tornado Warning	SHV	Harrison	40 min
Dec 4, 3:11 PM CST	Severe Thunderstorm Warning	SHV	Hempstead, Howard	49 min

Nearby

Severe Thunderstorm Warnings in Texas, 1999 Every severe thunderstorm warning 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.