Alert archive / Louisiana / Tornado Watches in 1999

Tornado Watch 215

May 5, 199926 parishes in Louisiana; 6 counties in Texas

The Storm Prediction Center issued this tornado watch at May 5, 1999, 2:45 PM CDT for 26 parishes in Louisiana; 6 counties in Texas. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
May 5, 1999, 2:45 PM CDT (19:45 UTC)
Expired
May 5, 1999, 9:00 PM CDT
In force
6 hr
Issued by
the Storm Prediction Center
All 32 counties

Avoyelles Parish, LA, Bienville Parish, LA, Bossier Parish, LA, Caddo Parish, LA, Caldwell Parish, LA, Catahoula Parish, LA, Claiborne Parish, LA, De Soto Parish, LA, East Carroll Parish, LA, Franklin Parish, LA, Grant Parish, LA, Jackson Parish, LA, LaSalle Parish, LA, Lincoln Parish, LA, Morehouse Parish, LA, Natchitoches Parish, LA, Ouachita Parish, LA, Rapides Parish, LA, Red River Parish, LA, Richland Parish, LA, Sabine Parish, LA, Union Parish, LA, Vernon Parish, LA, Webster Parish, LA, West Carroll Parish, LA, Winn Parish, LA, Angelina County, TX, Nacogdoches County, TX, Panola County, TX, Sabine County, TX, San Augustine County, TX, Shelby County, TX

The radar

The Ft Polk radar (KPOE), 72 km from the middle of the area, began a volume at 19:45 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.

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
May 5, 2:50 PM CDTSevere Thunderstorm WarningSHVBossier, Caddo50 min
May 5, 2:50 PM CDTSevere Thunderstorm WarningSHVPanola, Shelby50 min
May 5, 3:28 PM CDTSevere Thunderstorm WarningSHVWebster47 min
May 5, 3:40 PM CDTSevere Thunderstorm WarningSHVDe Soto50 min
May 5, 3:40 PM CDTSevere Thunderstorm WarningSHVBossier, Caddo50 min
May 5, 4:18 PM CDTSevere Thunderstorm WarningSHVClaiborne47 min
May 5, 4:38 PM CDTSevere Thunderstorm WarningSHVBienville, Webster47 min
May 5, 4:50 PM CDTSevere Thunderstorm WarningJANMorehouse35 min
May 5, 5:32 PM CDTSevere Thunderstorm WarningSHVCaldwell, Winn48 min
May 5, 5:54 PM CDTSevere Thunderstorm WarningJANEast Carroll51 min
May 5, 5:57 PM CDTSevere Thunderstorm WarningJANRichland48 min
May 5, 6:37 PM CDTSevere Thunderstorm WarningSHVOuachita48 min
May 5, 6:42 PM CDTTornado WarningJANEast Carroll, Richland, West Carroll48 min
May 5, 6:54 PM CDTSevere Thunderstorm WarningJANRichland51 min
May 5, 7:12 PM CDTSevere Thunderstorm WarningSHVSabine48 min
May 5, 7:37 PM CDTSevere Thunderstorm WarningSHVCaldwell48 min
May 5, 7:43 PM CDTSevere Thunderstorm WarningJANEast Carroll, West Carroll47 min
May 5, 7:45 PM CDTSevere Thunderstorm WarningJANRichland50 min
May 5, 8:22 PM CDTSevere Thunderstorm WarningJANFranklin48 min
May 5, 8:35 PM CDTSevere Thunderstorm WarningJANEast Carroll, Madison50 min
May 5, 8:35 PM CDTSevere Thunderstorm WarningJANWest Carroll50 min
May 5, 8:51 PM CDTFlash Flood WarningJANEast Carroll119 min

The nearest sounding before it

Shreveport, LA (KSHV), launched 12:00Z, 7.8 hours before the alert went out and 93 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 1999-05-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2215 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 1999-05-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 208 square meters per square second.1939587897Sfc1 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
2215 J/kg
Mixed-layer CIN
-32 J/kg
Mixed-layer LCL
624 m above ground
0-6 km bulk shear
59 kt
0-1 km storm-relative helicity
208 m²/s²
0-3 km storm-relative helicity
255 m²/s²
Significant tornado parameter
0.0
Supercell composite
9.7

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 Louisiana, 1999Tornado Watches in Texas, 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; radar from the NEXRAD Level II archive.