Alert archive / Louisiana / Tornado Watches in 2011
Tornado Watch 210
The Storm Prediction Center issued this tornado watch at Apr 25, 2011, 10:47 PM CDT for 6 parishes in Louisiana; 4 counties in Texas. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 25, 2011, 10:47 PM CDT (03:47 UTC)
- Expired
- Apr 26, 2011, 4:00 AM CDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2.5 in
- Strongest gust expected
- 60 kt
Counties Allen Parish, LA, Beauregard Parish, LA, Evangeline Parish, LA, Rapides Parish, LA, Sabine Parish, LA, Vernon Parish, LA, Hardin County, TX, Jasper County, TX, Newton County, TX, Tyler County, TX
What SPC expected
The probabilities SPC published with the watch, for the watch area over its life.
- Two or more tornadoes
- 40%
- One or more EF2 to EF5 tornadoes
- 10%
- Ten or more severe wind reports
- 30%
- One or more gusts of 65 knots or more
- 20%
- Ten or more severe hail reports
- 50%
- One or more hailstones of 2 inches or more
- 30%
- Six or more combined severe hail and wind reports
- 70%
Warnings issued inside it
14 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 25, 11:20 PM CDT | Tornado Warning | LCH | Jasper | 25 min |
| Apr 25, 11:28 PM CDT | Severe Thunderstorm Warning | LCH | Jasper, Newton, Tyler | 62 min |
| Apr 25, 11:43 PM CDT | Tornado Warning | LCH | Jasper, Newton | 32 min |
| Apr 26, 12:14 AM CDT | Tornado Warning | LCH | Vernon | 31 min |
| Apr 26, 12:35 AM CDT | Severe Thunderstorm Warning | LCH | Jasper, Tyler | 55 min |
| Apr 26, 12:43 AM CDT | Tornado Warning | LCH | Vernon | 47 min |
| Apr 26, 1:13 AM CDT | Severe Thunderstorm Warning | LCH | Hardin, Jasper, Tyler | 62 min |
| Apr 26, 1:21 AM CDT | Severe Thunderstorm Warning | LCH | Rapides, Vernon | 39 min |
| Apr 26, 2:06 AM CDT | Severe Thunderstorm Warning | LCH | Beauregard, Calcasieu | 24 min |
| Apr 26, 2:17 AM CDT | Severe Thunderstorm Warning | LCH | Allen, Avoyelles, Evangeline, Rapides, Saint Landry | 58 min |
| Apr 26, 2:23 AM CDT | Severe Thunderstorm Warning | LCH | Hardin, Jasper, Tyler | 52 min |
| Apr 26, 2:35 AM CDT | Severe Thunderstorm Warning | LCH | Allen, Beauregard, Calcasieu, Jefferson Davis | 55 min |
| Apr 26, 2:56 AM CDT | Tornado Warning | LCH | Hardin | 34 min |
| Apr 26, 3:17 AM CDT | Severe Thunderstorm Warning | LCH | Hardin, Jasper, Jefferson, Newton, Orange | 58 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 00:00Z, 3.8 hours before the alert went out and 112 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
- 2759 J/kg
- Mixed-layer CIN
- 0 J/kg
- Mixed-layer LCL
- 581 m above ground
- 0-6 km bulk shear
- 44 kt
- 0-1 km storm-relative helicity
- 86 m²/s²
- 0-3 km storm-relative helicity
- 133 m²/s²
- Significant tornado parameter
- 1.5
- Supercell composite
- 8.4
The text
As transmitted, in the capitals the NWS used until 2016.
838
WWUS20 KWNS 260342
SEL0
SPC WW 260342
LAZ000-TXZ000-260900-
URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 210
NWS STORM PREDICTION CENTER NORMAN OK
1045 PM CDT MON APR 25 2011
THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF
PARTS OF WESTERN AND SOUTHWEST LOUISIANA
SMALL PART OF SOUTHEAST TEXAS
EFFECTIVE THIS MONDAY NIGHT AND TUESDAY MORNING FROM 1045 PM
UNTIL 400 AM CDT.
TORNADOES...HAIL TO 2.5 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 35 STATUTE
MILES NORTH AND SOUTH OF A LINE FROM 85 MILES WEST OF FORT POLK
LOUISIANA TO 55 MILES EAST SOUTHEAST OF FORT POLK LOUISIANA. 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...CONTINUE...WW 205...WW 206...WW 207...
DISCUSSION...LONG-LIVED SUPERCELL ECENTRAL TX WILL LIKELY CONTINUE
TO BE A THREAT FOR LARGE HAIL AND TORNADOS FOR A FEW MORE HOURS
GIVEN THE SHEAR AND INSTABILITY ENVIRONMENT ACROSS SWRN LA. THUS
EXPECT THE COMPLEX TO MOVE ESEWD INTO WRN LA.
AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
550. MEAN STORM MOTION VECTOR 29025.
...HALESSPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 25, 7:34 PM CDT | Mesoscale Discussion | SPC | Bossier, Claiborne, Lincoln, Union, Webster | 116 min |
| Apr 25, 9:23 PM CDT | Tornado Watch | SPC | Caldwell, East Carroll, Franklin, Madison, Morehouse, Ouachita and 2 more | 7 hr |
| Apr 25, 9:37 PM CDT | Mesoscale Discussion | SPC | De Soto, Sabine | 83 min |
| Apr 25, 11:05 PM CDT | Mesoscale Discussion | SPC | East Carroll, Morehouse, West Carroll | 115 min |
| Apr 26, 1:34 AM CDT | Mesoscale Discussion | SPC | Allen, Beauregard, Calcasieu, Evangeline, Jefferson Davis, Rapides and 1 more | 86 min |
| Apr 26, 1:52 AM CDT | Severe Thunderstorm Watch | SPC | Acadia, Allen, Avoyelles, Beauregard, Calcasieu, Cameron and 7 more | 5 hr |
| Apr 26, 1:11 PM CDT | Mesoscale Discussion | SPC | Bienville, Bossier, Caddo, Claiborne, De Soto, Jackson and 5 more | 2 hr |
| Apr 26, 1:44 PM CDT | Tornado Watch | SPC | Bossier, Caddo, Claiborne, Union, Webster | 10 hr |
| Apr 26, 3:59 PM CDT | Mesoscale Discussion | SPC | Bossier, Caddo, Claiborne, Union, Webster | 91 min |
| Apr 26, 4:56 PM CDT | Tornado Watch | SPC | Beauregard, Bienville, Caldwell, De Soto, Grant, Jackson and 9 more | 5 hr |
| Apr 26, 6:43 PM CDT | Mesoscale Discussion | SPC | Beauregard, Bienville, Bossier, Caddo, Caldwell, Claiborne and 13 more | 2 hr |
| Apr 26, 3:01 PM CDT | Mesoscale Discussion | SPC | Atascosa, Austin, Bastrop, Bee, Bexar, Blanco and 22 more | 89 min |
| Apr 26, 3:15 PM CDT | Mesoscale Discussion | SPC | Archer, Baylor, Childress, Clay, Collingsworth, Cottle and 16 more | 90 min |
| Apr 26, 3:43 PM CDT | Severe Thunderstorm Watch | SPC | Archer, Baylor, Clay, Foard, Hardeman, Knox and 2 more | 6 hr |
Nearby
Tornado Watches in Louisiana, 2011Tornado Watches in Texas, 2011Every tornado watch in 2011
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.