Alert archive / Louisiana / Tornado Watches in 2008
Tornado Watch 91
The Storm Prediction Center issued this tornado watch at Mar 3, 2008, 10:36 AM CST for 14 counties in Arkansas; 39 parishes in Louisiana; 9 counties in Texas. It was in force for 9 hr.
The area
The outline as issued.
The facts
- Issued
- Mar 3, 2008, 10:36 AM CST (16:36 UTC)
- Expired
- Mar 3, 2008, 8:00 PM CST
- In force
- 9 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 70 kt
All 62 counties
Ashley County, AR, Bradley County, AR, Calhoun County, AR, Chicot County, AR, Cleveland County, AR, Columbia County, AR, Dallas County, AR, Desha County, AR, Drew County, AR, Lafayette County, AR, Lincoln County, AR, Nevada County, AR, Ouachita County, AR, Union County, AR, Acadia Parish, LA, Allen Parish, LA, Avoyelles Parish, LA, Beauregard Parish, LA, Bienville Parish, LA, Bossier Parish, LA, Caddo Parish, LA, Calcasieu Parish, LA, Caldwell Parish, LA, Cameron Parish, LA, Catahoula Parish, LA, Claiborne Parish, LA, Concordia Parish, LA, De Soto Parish, LA, East Carroll Parish, LA, Evangeline Parish, LA, Franklin Parish, LA, Grant Parish, LA, Jackson Parish, LA, Jefferson Davis Parish, LA, Lafayette 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, Saint Landry Parish, LA, Tensas Parish, LA, Union Parish, LA, Vermilion Parish, LA, Vernon Parish, LA, Webster Parish, LA, West Carroll Parish, LA, Winn Parish, LA, Hardin County, TX, Jasper County, TX, Jefferson County, TX, Newton County, TX, Orange County, TX, Sabine County, TX, San Augustine County, TX, Shelby County, TX, Tyler County, TX
The radar
The Shreveport radar (KSHV), 95 km from the middle of the area, began a volume at 16:40 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.
What SPC expected
The probabilities SPC published with the watch, for the watch area over its life.
- Two or more tornadoes
- 50%
- One or more EF2 to EF5 tornadoes
- 20%
- Ten or more severe wind reports
- 60%
- One or more gusts of 65 knots or more
- 30%
- Ten or more severe hail reports
- 40%
- One or more hailstones of 2 inches or more
- 10%
- Six or more combined severe hail and wind reports
- 90%
Warnings issued inside it
9 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 3, 11:03 AM CST | Severe Thunderstorm Warning | SHV | Caddo, De Soto | 42 min |
| Mar 3, 1:51 PM CST | Severe Thunderstorm Warning | LCH | Beauregard, Vernon | 54 min |
| Mar 3, 2:31 PM CST | Severe Thunderstorm Warning | JAN | Ashley | 64 min |
| Mar 3, 2:39 PM CST | Severe Thunderstorm Warning | SHV | Natchitoches, Sabine | 51 min |
| Mar 3, 2:40 PM CST | Severe Thunderstorm Warning | LCH | Allen, Beauregard, Calcasieu, Rapides, Vernon | 50 min |
| Mar 3, 2:58 PM CST | Tornado Warning | LCH | Rapides, Vernon | 21 min |
| Mar 3, 4:55 PM CST | Severe Thunderstorm Warning | JAN | East Carroll, Madison | 50 min |
| Mar 3, 5:23 PM CST | Severe Thunderstorm Warning | JAN | Catahoula, Concordia | 52 min |
| Mar 3, 5:56 PM CST | Severe Thunderstorm Warning | LCH | Saint Landry | 34 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
Shreveport, LA (KSHV), launched 12:00Z, 4.6 hours before the alert went out and 88 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
- 77 J/kg
- Mixed-layer CIN
- -167 J/kg
- Mixed-layer LCL
- 667 m above ground
- 0-6 km bulk shear
- 42 kt
- 0-1 km storm-relative helicity
- 350 m²/s²
- 0-3 km storm-relative helicity
- 489 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted, in the capitals the NWS used until 2016.
000
WWUS20 KWNS 031636
SEL1
SPC WW 031636
ARZ000-LAZ000-TXZ000-CWZ000-040000-
URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 91
NWS STORM PREDICTION CENTER NORMAN OK
1035 AM CST MON MAR 3 2008
THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF
PARTS OF SOUTHERN ARKANSAS
MUCH OF NORTHERN AND WESTERN LOUISIANA
PARTS OF SOUTHEASTERN TEXAS
COASTAL WATERS
EFFECTIVE THIS MONDAY MORNING AND EVENING FROM 1035 AM UNTIL 600
PM CST.
TORNADOES...HAIL TO 1.5 INCHES IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 80 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.
THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 75 STATUTE
MILES EAST AND WEST OF A LINE FROM 25 MILES NORTHWEST OF
MONTICELLO ARKANSAS TO 35 MILES SOUTH SOUTHWEST OF LAKE CHARLES
LOUISIANA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU1).
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 90...
DISCUSSION...INCREASING THREAT OF SUPERCELL DEVELOPMENT ASSOCIATED
WITH SQUALL LINE MOVING FROM ERN TX INTO LA. STRONG SHEAR PROFILES
AND INCREASING INSTABILITY COUPLED WITH APPROACH OF STRONG
TROUGH/WIND MAX FROM WRN TX WILL LEAD TO POTENTIAL FOR TORNADOES
BOTH WITH THE SQUALL LINE AND LATER THIS AFTERNOON FOR DISCRETE
STORMS AHEAD OF THE LINE.
AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 70 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
500. MEAN STORM MOTION VECTOR 24045.
...HALESSPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 2, 8:23 PM CST | Tornado Watch | SPC | Crawford, Franklin, Howard, Little River, Miller, Polk and 3 more | 8 hr |
| Mar 3, 1:36 AM CST | Mesoscale Discussion | SPC | Howard, Little River, Logan, Montgomery, Pike, Polk and 3 more | 54 min |
| Mar 3, 3:01 AM CST | Mesoscale Discussion | SPC | Clark, Cleburne, Conway, Dallas, Faulkner, Garland and 20 more | 89 min |
| Mar 3, 5:21 AM CST | Mesoscale Discussion | SPC | Lafayette, Miller | 84 min |
| Mar 3, 6:47 AM CST | Severe Thunderstorm Watch | SPC | Columbia, Hempstead, Howard, Lafayette, Little River, Miller and 3 more | 6 hr |
| Mar 3, 10:18 AM CST | Mesoscale Discussion | SPC | Columbia, Hempstead, Howard, Lafayette, Little River, Miller and 3 more | 87 min |
| Mar 3, 1:25 PM CST | Mesoscale Discussion | SPC | Ashley, Chicot, Desha, Drew | 95 min |
| Mar 3, 2:25 PM CST | Tornado Watch | SPC | Ascension, Assumption, East Baton Rouge, East Feliciana, Iberia, Iberville and 19 more | 11 hr |
| Mar 3, 5:58 PM CST | Mesoscale Discussion | SPC | Ascension, Assumption, East Baton Rouge, East Feliciana, Iberia, Iberville and 19 more | 62 min |
| Mar 2, 6:05 PM CST | Tornado Watch | SPC | Bosque, Callahan, Collin, Comanche, Cooke, Dallas and 28 more | 8 hr |
| Mar 2, 8:01 PM CST | Mesoscale Discussion | SPC | Collin, Delta, Fannin, Franklin, Grayson, Hopkins and 4 more | 59 min |
| Mar 2, 11:04 PM CST | Mesoscale Discussion | SPC | Brown, Callahan, Coke, Coleman, Comanche, Concho and 12 more | 56 min |
| Mar 2, 11:27 PM CST | Severe Thunderstorm Watch | SPC | Brown, Coke, Coleman, Concho, Crockett, Irion and 13 more | 5 hr |
| Mar 3, 1:57 AM CST | Tornado Watch | SPC | Anderson, Bell, Bosque, Collin, Comanche, Coryell and 26 more | 6 hr |
| Mar 3, 3:24 AM CST | Mesoscale Discussion | SPC | Bastrop, Blanco, Brazos, Burleson, Burnet, Grimes and 9 more | 96 min |
Nearby
Tornado Watches in Louisiana, 2008Tornado Watches in Arkansas, 2008Tornado Watches in Texas, 2008Every tornado watch in 2008
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.