Alert archive / Louisiana / Tornado Watches in 2005
Tornado Watch 150
The Storm Prediction Center issued this tornado watch at Apr 11, 2005, 10:15 AM CDT for 4 states. It was in force for 9 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 11, 2005, 10:15 AM CDT (15:15 UTC)
- Expired
- Apr 11, 2005, 7:00 PM CDT
- In force
- 9 hr
- Issued by
- the Storm Prediction Center
All 67 counties
Ashley County, AR, Chicot County, AR, Desha County, AR, Drew County, AR, 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, East Carroll Parish, LA, Evangeline Parish, LA, Franklin Parish, LA, Grant Parish, LA, Jackson Parish, LA, Jefferson Davis Parish, LA, LaSalle Parish, LA, Lincoln Parish, LA, Madison Parish, LA, Morehouse Parish, LA, Natchitoches Parish, LA, Ouachita Parish, LA, Rapides Parish, LA, Red River Parish, LA, Richland Parish, LA, Sabine Parish, LA, Tensas Parish, LA, Union Parish, LA, Vernon Parish, LA, West Carroll Parish, LA, Winn Parish, LA, Adams County, MS, Bolivar County, MS, Calhoun County, MS, Carroll County, MS, Chickasaw County, MS, Claiborne County, MS, Grenada County, MS, Holmes County, MS, Humphreys County, MS, Issaquena County, MS, Jefferson County, MS, Leflore County, MS, Montgomery County, MS, Sharkey County, MS, Sunflower County, MS, Tallahatchie County, MS, Warren County, MS, Washington County, MS, Webster County, MS, Yazoo County, MS, Brazoria County, TX, Chambers County, TX, Galveston County, TX, Hardin County, TX, Harris County, TX, Jasper County, TX, Jefferson County, TX, Liberty County, TX, Newton County, TX, Orange County, TX, Sabine County, TX, Tyler County, TX
Warnings issued inside it
24 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 11, 10:28 AM CDT | Severe Thunderstorm Warning | JAN | Carroll, Holmes, Leflore | 47 min |
| Apr 11, 10:36 AM CDT | Flash Flood Warning | JAN | Carroll | 3 hr |
| Apr 11, 11:11 AM CDT | Severe Thunderstorm Warning | JAN | Carroll, Grenada | 64 min |
| Apr 11, 11:20 AM CDT | Flash Flood Warning | JAN | Humphreys, Sunflower, Washington | 6 hr |
| Apr 11, 11:22 AM CDT | Severe Thunderstorm Warning | JAN | Leflore | 53 min |
| Apr 11, 11:25 AM CDT | Severe Thunderstorm Warning | LCH | Hardin, Jasper | 35 min |
| Apr 11, 11:28 AM CDT | Flash Flood Warning | JAN | Grenada | 6 hr |
| Apr 11, 11:37 AM CDT | Severe Thunderstorm Warning | SHV | Sabine | 53 min |
| Apr 11, 11:57 AM CDT | Severe Thunderstorm Warning | LCH | Jasper, Newton | 33 min |
| Apr 11, 12:09 PM CDT | Severe Thunderstorm Warning | JAN | Carroll, Grenada | 66 min |
| Apr 11, 12:10 PM CDT | Flash Flood Warning | MEG | Tallahatchie | 110 min |
| Apr 11, 12:24 PM CDT | Severe Thunderstorm Warning | LCH | Beauregard | 36 min |
| Apr 11, 2:05 PM CDT | Flash Flood Warning | MEG | Panola, Quitman, Tallahatchie, Tate | 115 min |
| Apr 11, 2:06 PM CDT | Severe Thunderstorm Warning | JAN | Washington | 39 min |
| Apr 11, 2:07 PM CDT | Severe Thunderstorm Warning | JAN | East Carroll | 53 min |
| Apr 11, 2:20 PM CDT | Tornado Warning | JAN | Issaquena, Sharkey | 40 min |
| Apr 11, 2:25 PM CDT | Flash Flood Warning | JAN | Carroll, Holmes, Leflore | 6 hr |
| Apr 11, 2:34 PM CDT | Severe Thunderstorm Warning | JAN | Catahoula, Concordia | 56 min |
| Apr 11, 2:38 PM CDT | Severe Thunderstorm Warning | JAN | Humphreys, Yazoo | 67 min |
| Apr 11, 2:52 PM CDT | Severe Thunderstorm Warning | JAN | Leflore | 68 min |
| Apr 11, 3:12 PM CDT | Severe Thunderstorm Warning | JAN | Tensas | 48 min |
| Apr 11, 3:56 PM CDT | Flash Flood Warning | JAN | Warren | 2 hr |
| Apr 11, 4:03 PM CDT | Severe Thunderstorm Warning | JAN | Warren | 42 min |
| Apr 11, 4:41 PM CDT | Severe Thunderstorm Warning | JAN | Clay, Webster | 64 min |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
Lake Charles Mun, LA (KLCH), launched 12:00Z, 3.3 hours before the alert went out and 89 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
- 1084 J/kg
- Mixed-layer CIN
- -143 J/kg
- Mixed-layer LCL
- 737 m above ground
- 0-6 km bulk shear
- 50 kt
- 0-1 km storm-relative helicity
- 285 m²/s²
- 0-3 km storm-relative helicity
- 342 m²/s²
- Significant tornado parameter
- 0.8
- Supercell composite
- 12.2
The text
As transmitted, in the capitals the NWS used until 2016.
000
WWUS20 KWNS 111519
SEL0
SPC WW 111519
ARZ000-LAZ000-MSZ000-TXZ000-CWZ000-120000-
URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 150
NWS STORM PREDICTION CENTER NORMAN OK
1015 AM CDT MON APR 11 2005
THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF
SOUTHEAST ARKANSAS
WESTERN AND NORTHERN LOUISIANA
WESTERN AND NORTHERN MISSISSIPPI
EXTREME SOUTHEAST TEXAS
COASTAL WATERS
EFFECTIVE THIS MONDAY MORNING AND EVENING FROM 1015 AM UNTIL 700
PM CDT.
...THIS IS A PARTICULARLY DANGEROUS SITUATION...
DESTRUCTIVE TORNADOES...LARGE HAIL TO 3 INCHES IN DIAMETER...
THUNDERSTORM WIND GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE
POSSIBLE IN THESE AREAS.
THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 80 STATUTE MILES
EAST AND WEST OF A LINE FROM 35 MILES NORTH NORTHWEST OF GREENWOOD
MISSISSIPPI TO 35 MILES SOUTH SOUTHWEST OF GALVESTON TEXAS. FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU0).
REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH AREA.
PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR THREATENING
WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS AND POSSIBLE
WARNINGS.
OTHER WATCH INFORMATION...THIS TORNADO WATCH REPLACES SEVERE
THUNDERSTORM WATCH NUMBER 149. WATCH NUMBER 149 WILL NOT BE IN
EFFECT AFTER 1015 AM CDT.
DISCUSSION...TORNADO THREAT EXPECTED TO INCREASE THROUGH THE
AFTERNOON OVER WW AREA AS SURFACE HEATING DESTABILIZES STRONGLY
SHEARED/INCREASINGLY MOIST ENVIRONMENT AHEAD OF EXISTING CONVECTIVE
BAND IN SE TX/WRN LA. OTHER STORMS MAY FORM AHEAD OF CONVECTIVE
BAND...IN ZONE OF GREATER HEATING/LOW LEVEL CONFLUENCE CLOSER TO
THE MS RIVER. 50-60 KT DEEP SSWLY SHEAR ABOVE MOIST...SELY LOW
LEVEL FLOW WILL BE SUPPORTIVE OF LOW LEVEL STORM ROTATION.
AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 3 INCHES. EXTREME TURBULENCE AND SURFACE WIND
GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500.
MEAN STORM MOTION VECTOR 22035.
...CORFIDI
335,0885 285,0933 285,0961 335,0914SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 10, 8:53 PM CDT | Mesoscale Discussion | SPC | Benton, Crawford, Sebastian, Washington | 2 hr |
| Apr 10, 9:15 PM CDT | Severe Thunderstorm Watch | SPC | Benton, Carroll, Clark, Crawford, Franklin, Howard and 10 more | 7 hr |
| Apr 11, 1:23 AM CDT | Mesoscale Discussion | SPC | Benton, Carroll, Clark, Crawford, Franklin, Howard and 11 more | 67 min |
| Apr 11, 3:12 AM CDT | Mesoscale Discussion | SPC | Columbia, Lafayette, Miller, Union | 63 min |
| Apr 11, 3:23 AM CDT | Mesoscale Discussion | SPC | Benton, Carroll, Clark, Crawford, Franklin, Howard and 11 more | 67 min |
| Apr 11, 3:45 AM CDT | Severe Thunderstorm Watch | SPC | Ashley, Bradley, Columbia, Lafayette, Miller, Union | 7 hr |
| Apr 11, 6:17 AM CDT | Mesoscale Discussion | SPC | Arkansas, Clay, Cleburne, Conway, Craighead, Crittenden and 27 more | 118 min |
| Apr 11, 6:53 AM CDT | Mesoscale Discussion | SPC | Ashley, Columbia, Lafayette, Miller, Union | 67 min |
| Apr 11, 9:41 AM CDT | Mesoscale Discussion | SPC | Ashley, Bradley, Chicot, Columbia, Union | 2 hr |
| Apr 11, 12:12 PM CDT | Mesoscale Discussion | SPC | Ashley, Bradley, Chicot, Columbia, Union | 2 hr |
| Apr 11, 2:01 PM CDT | Mesoscale Discussion | SPC | Benton, Carroll, Madison, Washington | 89 min |
| Apr 11, 3:56 AM CDT | Mesoscale Discussion | SPC | Franklin, Madison, Tensas | 64 min |
| Apr 11, 1:41 PM CDT | Mesoscale Discussion | SPC | Ascension, Assumption, East Baton Rouge, East Feliciana, Iberville, Lafourche and 14 more | 2 hr |
| Apr 11, 2:05 PM CDT | Tornado Watch | SPC | Ascension, Assumption, East Baton Rouge, East Feliciana, Iberia, Iberville and 14 more | 7 hr |
| Apr 11, 6:35 PM CDT | Tornado Watch | SPC | Jefferson, Lafourche, Orleans, Saint Bernard, Saint Charles, Saint Tammany and 1 more | 4 hr |
| Apr 11, 6:52 PM CDT | Mesoscale Discussion | SPC | Ascension, Assumption, East Baton Rouge, East Feliciana, Iberville, Livingston and 9 more | 83 min |
| Apr 11, 1:17 PM CDT | Mesoscale Discussion | SPC | Alcorn, Benton, Coahoma, Itawamba, Lafayette, Lee and 10 more | 58 min |
| Apr 11, 1:35 PM CDT | Tornado Watch | SPC | Alcorn, Benton, Calhoun, Chickasaw, Itawamba, Lafayette and 10 more | 5 hr |
| Apr 10, 7:39 PM CDT | Mesoscale Discussion | SPC | Bandera, Bastrop, Bell, Bexar, Blanco, Bosque and 45 more | 96 min |
| Apr 10, 10:45 PM CDT | Severe Thunderstorm Watch | SPC | Anderson, Bastrop, Bell, Bexar, Blanco, Brazos and 39 more | 6 hr |
Nearby
Tornado Watches in Louisiana, 2005Tornado Watches in Mississippi, 2005Tornado Watches in Texas, 2005Every tornado watch in 2005
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.