Alert archive / Texas / Tornado Watches in 1999

Tornado Watch 1

January 1, 199913 parishes in Louisiana; 37 counties in Texas

The Storm Prediction Center issued this tornado watch at Jan 1, 1999, 4:30 PM CST for 13 parishes in Louisiana; 37 counties in Texas. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Jan 1, 1999, 4:30 PM CST (22:30 UTC)
Expired
Jan 1, 1999, 10:00 PM CST
In force
6 hr
Issued by
the Storm Prediction Center
All 50 counties

Allen Parish, LA, Beauregard Parish, LA, Bienville Parish, LA, Calcasieu Parish, LA, De Soto Parish, LA, Grant Parish, LA, Jefferson Davis Parish, LA, Natchitoches Parish, LA, Rapides Parish, LA, Red River Parish, LA, Sabine Parish, LA, Vernon Parish, LA, Winn Parish, LA, Anderson County, TX, Angelina County, TX, Brazos County, TX, Cherokee County, TX, Freestone County, TX, Gregg County, TX, Grimes County, TX, Hardin County, TX, Harrison County, TX, Henderson County, TX, Houston County, TX, Jasper County, TX, Kaufman County, TX, Leon County, TX, Limestone County, TX, Madison County, TX, Nacogdoches County, TX, Navarro County, TX, Newton County, TX, Orange County, TX, Panola County, TX, Polk County, TX, Rains County, TX, Robertson County, TX, Rockwall County, TX, Rusk County, TX, Sabine County, TX, San Augustine County, TX, San Jacinto County, TX, Shelby County, TX, Smith County, TX, Trinity County, TX, Tyler County, TX, Upshur County, TX, Van Zandt County, TX, Walker County, TX, Wood County, TX

Warnings issued inside it

20 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
Jan 1, 4:53 PM CSTTornado WarningHGXPolk, Trinity62 min
Jan 1, 5:39 PM CSTSevere Thunderstorm WarningSHVNacogdoches31 min
Jan 1, 6:13 PM CSTSevere Thunderstorm WarningFWDLimestone, Robertson47 min
Jan 1, 6:40 PM CSTSevere Thunderstorm WarningFWDFreestone, Leon50 min
Jan 1, 7:17 PM CSTFlash Flood WarningFWDFreestone, Limestone4 hr
Jan 1, 7:17 PM CSTFlash Flood WarningFWDAnderson4 hr
Jan 1, 7:30 PM CSTTornado WarningSHVSmith30 min
Jan 1, 7:34 PM CSTSevere Thunderstorm WarningFWDRobertson41 min
Jan 1, 7:41 PM CSTSevere Thunderstorm WarningHGXHouston59 min
Jan 1, 7:51 PM CSTTornado WarningHGXBrazos59 min
Jan 1, 8:20 PM CSTSevere Thunderstorm WarningSHVSmith30 min
Jan 1, 8:28 PM CSTTornado WarningSHVUpshur32 min
Jan 1, 8:35 PM CSTSevere Thunderstorm WarningSHVCherokee, Rusk45 min
Jan 1, 8:35 PM CSTSevere Thunderstorm WarningSHVGregg45 min
Jan 1, 8:37 PM CSTSevere Thunderstorm WarningHGXMadison48 min
Jan 1, 8:56 PM CSTSevere Thunderstorm WarningSHVHarrison44 min
Jan 1, 9:12 PM CSTSevere Thunderstorm WarningHGXGrimes, Washington63 min
Jan 1, 9:15 PM CSTSevere Thunderstorm WarningHGXHouston65 min
Jan 1, 9:50 PM CSTTornado WarningHGXSan Jacinto65 min
Jan 1, 9:53 PM CSTTornado WarningSHVPanola32 min

The nearest sounding before it

Shreveport, LA (KSHV), launched 12:00Z, 10.5 hours before the alert went out and 139 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 1999-01-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 1999-01-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 327 square meters per square second.19395878Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
561 m above ground
0-6 km bulk shear
46 kt
0-1 km storm-relative helicity
327 m²/s²
0-3 km storm-relative helicity
434 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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.

Nearby

Tornado Watches in Texas, 1999Tornado Watches in Louisiana, 1999Every tornado watch 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.