Alert archive / Louisiana / Severe Thunderstorm Watches in 2001

Severe Thunderstorm Watch 775

October 11, 200121 parishes in Louisiana; 7 counties in Mississippi

The Storm Prediction Center issued this severe thunderstorm watch at Oct 11, 2001, 3:00 PM CDT for 21 parishes in Louisiana; 7 counties in Mississippi. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
Oct 11, 2001, 3:00 PM CDT (20:00 UTC)
Expired
Oct 11, 2001, 8:00 PM CDT
In force
5 hr
Issued by
the Storm Prediction Center
All 28 counties

Acadia Parish, LA, Ascension Parish, LA, Assumption Parish, LA, East Baton Rouge Parish, LA, East Feliciana Parish, LA, Iberia Parish, LA, Iberville Parish, LA, Lafayette Parish, LA, Livingston Parish, LA, Pointe Coupee Parish, LA, Saint Helena Parish, LA, Saint James Parish, LA, Saint John the Baptist Parish, LA, Saint Landry Parish, LA, Saint Martin Parish, LA, St. Mary Parish, LA, Tangipahoa Parish, LA, Vermilion Parish, LA, Washington Parish, LA, West Baton Rouge Parish, LA, West Feliciana Parish, LA, Amite County, MS, Forrest County, MS, Lamar County, MS, Marion County, MS, Pike County, MS, Walthall County, MS, Wilkinson County, MS

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Oct 11, 4:16 PM CDTTornado WarningLIXLivingston, Tangipahoa29 min

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 12:00Z, 8.0 hours before the alert went out and 156 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, Lake Charles Mun, LA at 12:00Z on 2001-10-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1805 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, Lake Charles Mun, LA at 12:00Z on 2001-10-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 95 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
1805 J/kg
Mixed-layer CIN
-4 J/kg
Mixed-layer LCL
496 m above ground
0-6 km bulk shear
36 kt
0-1 km storm-relative helicity
95 m²/s²
0-3 km storm-relative helicity
120 m²/s²
Significant tornado parameter
1.2
Supercell composite
5.4

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.

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Oct 11, 10:00 AM CDTTornado WatchSPCAcadia, Allen, Avoyelles, Beauregard, Bienville, Bossier and 32 more5 hr
Oct 11, 6:00 PM CDTTornado WatchSPCOrleans, Saint Bernard, Saint Charles, Saint James, Saint John the Baptist, Saint Tammany and 2 more4 hr
Oct 11, 1:15 PM CDTTornado WatchSPCAttala, Calhoun, Carroll, Chickasaw, Choctaw, Claiborne and 46 more5 hr

Nearby

Severe Thunderstorm Watches in Louisiana, 2001Severe Thunderstorm Watches in Mississippi, 2001Every severe thunderstorm watch in 2001

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.