Alert archive / Louisiana / Severe Thunderstorm Watches in 2001
Severe Thunderstorm Watch 265
The Storm Prediction Center issued this severe thunderstorm watch at May 21, 2001, 1:45 PM CDT for 31 parishes in Louisiana; 10 counties in Texas. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- May 21, 2001, 1:45 PM CDT (18:45 UTC)
- Expired
- May 21, 2001, 7:00 PM CDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
All 41 counties
Acadia Parish, LA, Allen Parish, LA, Avoyelles Parish, LA, Beauregard Parish, LA, Bienville Parish, LA, Calcasieu Parish, LA, Caldwell Parish, LA, Cameron Parish, LA, Catahoula Parish, LA, Concordia Parish, LA, De Soto Parish, LA, Evangeline Parish, LA, Franklin Parish, LA, Grant Parish, LA, Iberville Parish, LA, Jackson Parish, LA, Jefferson Davis Parish, LA, Lafayette Parish, LA, LaSalle Parish, LA, Natchitoches Parish, LA, Pointe Coupee Parish, LA, Rapides Parish, LA, Red River Parish, LA, Richland Parish, LA, Sabine Parish, LA, Saint Landry Parish, LA, Saint Martin Parish, LA, Vermilion Parish, LA, Vernon Parish, LA, West Feliciana Parish, LA, Winn Parish, LA, Hardin County, TX, Jasper County, TX, Jefferson County, TX, Newton County, TX, Orange County, TX, Panola County, TX, Sabine County, TX, San Augustine County, TX, Shelby County, TX, Tyler County, TX
The radar
The Ft Polk radar (KPOE), 32 km from the middle of the area, began a volume at 18:46 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
8 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 21, 3:33 PM CDT | Severe Thunderstorm Warning | SHV | LaSalle | 27 min |
| May 21, 3:45 PM CDT | Severe Thunderstorm Warning | JAN | Catahoula | 45 min |
| May 21, 4:06 PM CDT | Severe Thunderstorm Warning | JAN | Concordia | 54 min |
| May 21, 5:55 PM CDT | Severe Thunderstorm Warning | LCH | Jasper | 65 min |
| May 21, 6:17 PM CDT | Severe Thunderstorm Warning | SHV | Grant | 58 min |
| May 21, 6:30 PM CDT | Severe Thunderstorm Warning | LCH | Newton | 60 min |
| May 21, 6:55 PM CDT | Severe Thunderstorm Warning | SHV | Caldwell | 65 min |
| May 21, 6:56 PM CDT | Severe Thunderstorm Warning | LCH | Vernon | 54 min |
The nearest sounding before it
Lake Charles Mun, LA (KLCH), launched 12:00Z, 6.8 hours before the alert went out and 133 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.
- Mixed-layer CAPE
- 1654 J/kg
- Mixed-layer CIN
- -13 J/kg
- Mixed-layer LCL
- 653 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- 118 m²/s²
- 0-3 km storm-relative helicity
- 89 m²/s²
- Significant tornado parameter
- 0.7
- Supercell composite
- 4.3
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.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 21, 12:30 PM CDT | Severe Thunderstorm Watch | SPC | East Baton Rouge, East Feliciana, Livingston, Saint Helena, Tangipahoa, Washington and 1 more | 5 hr |
| May 20, 11:15 PM CDT | Severe Thunderstorm Watch | SPC | Armstrong, Briscoe, Carson, Castro, Childress, Collingsworth and 20 more | 5 hr |
| May 21, 3:45 PM CDT | Severe Thunderstorm Watch | SPC | Aransas, Austin, Bee, Brazoria, Calhoun, Chambers and 18 more | 5 hr |
| May 21, 5:15 PM CDT | Severe Thunderstorm Watch | SPC | Brooks, Cameron, Duval, Hidalgo, Jim Hogg, Kenedy and 4 more | 5 hr |
Nearby
Severe Thunderstorm Watches in Louisiana, 2001Severe Thunderstorm Watches in Texas, 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; radar from the NEXRAD Level II archive.