Alert archive / Louisiana / Tornado Watches in 2007
Tornado Watch 710
The Storm Prediction Center issued this tornado watch at Oct 17, 2007, 11:13 AM CDT for 7 counties in Arkansas; 33 parishes in Louisiana; 27 counties in Texas. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Oct 17, 2007, 11:13 AM CDT (16:13 UTC)
- Expired
- Oct 17, 2007, 6:00 PM CDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 60 kt
All 67 counties
Columbia County, AR, Hempstead County, AR, Lafayette County, AR, Little River County, AR, Miller County, AR, Nevada 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, Claiborne Parish, LA, De Soto Parish, LA, Evangeline Parish, LA, Grant Parish, LA, Iberia Parish, LA, Jackson Parish, LA, Jefferson Davis Parish, LA, Lafayette Parish, LA, LaSalle Parish, LA, Lincoln Parish, LA, Natchitoches Parish, LA, Ouachita Parish, LA, Rapides Parish, LA, Red River Parish, LA, Sabine Parish, LA, Saint Landry Parish, LA, Saint Martin Parish, LA, St. Mary Parish, LA, Union Parish, LA, Vermilion Parish, LA, Vernon Parish, LA, Webster Parish, LA, Winn Parish, LA, Angelina County, TX, Bowie County, TX, Camp County, TX, Cass County, TX, Cherokee County, TX, Franklin County, TX, Gregg County, TX, Hardin County, TX, Harrison County, TX, Jasper County, TX, Jefferson County, TX, Marion County, TX, Morris County, TX, Nacogdoches County, TX, Newton County, TX, Orange County, TX, Panola County, TX, Red River County, TX, Rusk County, TX, Sabine County, TX, San Augustine County, TX, Shelby County, TX, Smith County, TX, Titus County, TX, Tyler County, TX, Upshur County, TX, Wood County, TX
The radar
The Shreveport radar (KSHV), 63 km from the middle of the area, began a volume at 16:16 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
- 40%
- One or more EF2 to EF5 tornadoes
- 20%
- Ten or more severe wind reports
- 30%
- One or more gusts of 65 knots or more
- 20%
- Ten or more severe hail reports
- 20%
- One or more hailstones of 2 inches or more
- 10%
- Six or more combined severe hail and wind reports
- 70%
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 |
|---|---|---|---|---|
| Oct 17, 2:04 PM CDT | Severe Thunderstorm Warning | SHV | Bossier, Webster | 41 min |
| Oct 17, 2:10 PM CDT | Tornado Warning | SHV | Bossier, Webster | 50 min |
| Oct 17, 2:52 PM CDT | Tornado Warning | SHV | Columbia | 38 min |
| Oct 17, 3:27 PM CDT | Severe Thunderstorm Warning | SHV | Columbia, Union | 48 min |
| Oct 17, 3:59 PM CDT | Tornado Warning | SHV | Union | 31 min |
| Oct 17, 4:40 PM CDT | Severe Thunderstorm Warning | SHV | Cherokee, Nacogdoches, Rusk | 35 min |
| Oct 17, 4:58 PM CDT | Tornado Warning | SHV | Nacogdoches, Rusk | 32 min |
| Oct 17, 5:29 PM CDT | Tornado Warning | SHV | Nacogdoches, Panola, Rusk, Shelby | 25 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, 4.2 hours before the alert went out and 67 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
- 865 J/kg
- Mixed-layer CIN
- -37 J/kg
- Mixed-layer LCL
- 477 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 140 m²/s²
- 0-3 km storm-relative helicity
- 170 m²/s²
- Significant tornado parameter
- 0.6
- Supercell composite
- 4.6
The text
As transmitted, in the capitals the NWS used until 2016.
000
WWUS20 KWNS 171608
SEL0
SPC WW 171608
ARZ000-LAZ000-TXZ000-CWZ000-172300-
URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 710
NWS STORM PREDICTION CENTER NORMAN OK
1110 AM CDT WED OCT 17 2007
THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF
SOUTHWEST ARKANSAS
MUCH OF WESTERN AND NORTHERN LOUISIANA
PARTS OF EASTERN TEXAS
COASTAL WATERS
EFFECTIVE THIS WEDNESDAY MORNING AND EVENING FROM 1110 AM UNTIL
600 PM CDT.
TORNADOES...HAIL TO 1.5 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 85 STATUTE
MILES EAST AND WEST OF A LINE FROM 20 MILES NORTH OF TEXARKANA
ARKANSAS TO 65 MILES SOUTHWEST OF INTRACOASTAL CITY 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 708...WW 709...
DISCUSSION...VERY MOIST AIRMASS ALONG WITH FAVORABLE LOW LEVEL SHEAR
PROFILES WILL SUPPORT INCREASING TORNADIC SUPERCELL POTENTIAL
THROUGH THE AFTERNOON. STORMS WILL INCREASE NWD THRU WATCH AREA AS
AIR MASS CONTINUES TO DESTABILIZE.
AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
550. MEAN STORM MOTION VECTOR 23025.
...HALESSPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 17, 9:36 AM CDT | Mesoscale Discussion | SPC | Ashley, Bradley, Calhoun, Cleveland, Columbia, Dallas and 5 more | 114 min |
| Oct 17, 10:24 AM CDT | Mesoscale Discussion | SPC | Benton, Washington | 96 min |
| Oct 17, 10:43 AM CDT | Tornado Watch | SPC | Benton, Carroll, Crawford, Franklin, Madison, Sebastian and 1 more | 7 hr |
| Oct 17, 2:36 PM CDT | Mesoscale Discussion | SPC | Ashley, Bradley, Calhoun, Clark, Cleveland, Columbia and 14 more | 114 min |
| Oct 17, 4:31 PM CDT | Tornado Watch | SPC | Arkansas, Baxter, Benton, Boone, Bradley, Calhoun and 55 more | 7 hr |
| Oct 17, 5:15 PM CDT | Mesoscale Discussion | SPC | Arkansas, Ashley, Chicot, Crittenden, Cross, Desha and 7 more | 2 hr |
| Oct 16, 10:36 PM CDT | Mesoscale Discussion | SPC | Armstrong, Briscoe, Carson, Castro, Childress, Collingsworth and 27 more | 114 min |
| Oct 16, 11:45 PM CDT | Severe Thunderstorm Watch | SPC | Armstrong, Carson, Collingsworth, Donley, Gray, Hansford and 10 more | 2 hr |
| Oct 17, 1:12 AM CDT | Mesoscale Discussion | SPC | Armstrong, Briscoe, Carson, Castro, Childress, Collingsworth and 24 more | 93 min |
| Oct 17, 1:36 AM CDT | Tornado Watch | SPC | Armstrong, Briscoe, Carson, Childress, Collingsworth, Cottle and 18 more | 7 hr |
| Oct 17, 1:44 AM CDT | Severe Thunderstorm Watch | SPC | Hansford, Hutchinson, Lipscomb, Moore, Ochiltree, Potter and 3 more | 7 hr |
| Oct 17, 4:41 AM CDT | Mesoscale Discussion | SPC | Archer, Baylor, Borden, Brown, Callahan, Coke and 32 more | 2 hr |
| Oct 17, 6:07 AM CDT | Mesoscale Discussion | SPC | Armstrong, Briscoe, Childress, Collingsworth, Cottle, Crosby and 19 more | 113 min |
| Oct 17, 6:50 AM CDT | Mesoscale Discussion | SPC | Hansford, Hutchinson, Lipscomb, Moore, Ochiltree, Potter and 2 more | 100 min |
| Oct 17, 7:43 AM CDT | Tornado Watch | SPC | Archer, Baylor, Clay, Foard, Hardeman, Knox and 2 more | 7 hr |
| Oct 17, 1:20 PM CDT | Mesoscale Discussion | SPC | Collin, Delta, Fannin, Grayson, Hunt, Lamar and 1 more | 85 min |
Nearby
Tornado Watches in Louisiana, 2007Tornado Watches in Texas, 2007Tornado Watches in Arkansas, 2007Every tornado watch in 2007
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.