Alert archive / Louisiana / Tornado Watches in 2009
Tornado Watch 762
The Storm Prediction Center issued this tornado watch at Oct 9, 2009, 8:36 AM CDT for 17 counties in Arkansas; 24 parishes in Louisiana; 11 counties in Mississippi. It was in force for 4 hr.
The area
The outline as issued.
The facts
- Issued
- Oct 9, 2009, 8:36 AM CDT (13:36 UTC)
- Expired
- Oct 9, 2009, 1:00 PM CDT
- In force
- 4 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 60 kt
All 52 counties
Arkansas County, AR, 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, Grant County, AR, Jefferson County, AR, Lincoln County, AR, Monroe County, AR, Ouachita County, AR, Phillips County, AR, Union County, AR, Bienville Parish, LA, Caldwell Parish, LA, Catahoula Parish, LA, Claiborne Parish, LA, Concordia Parish, LA, De Soto Parish, LA, East Carroll Parish, LA, Franklin Parish, LA, Grant Parish, LA, Jackson Parish, LA, LaSalle Parish, LA, Lincoln Parish, LA, Madison Parish, LA, Morehouse Parish, LA, Natchitoches Parish, LA, Ouachita Parish, LA, Red River Parish, LA, Richland Parish, LA, Sabine Parish, LA, Tensas Parish, LA, Union Parish, LA, Webster Parish, LA, West Carroll Parish, LA, Winn Parish, LA, Bolivar County, MS, Coahoma County, MS, Humphreys County, MS, Issaquena County, MS, Leflore County, MS, Quitman County, MS, Sharkey County, MS, Sunflower County, MS, Tallahatchie County, MS, Warren County, MS, Washington County, MS
The radar
The Shreveport radar (KSHV), 179 km from the middle of the area, began a volume at 13:37 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
- 30%
- One or more EF2 to EF5 tornadoes
- 40%
- Ten or more severe wind reports
- 50%
- One or more gusts of 65 knots or more
- 30%
- Ten or more severe hail reports
- 20%
- One or more hailstones of 2 inches or more
- 5%
- Six or more combined severe hail and wind reports
- 80%
Warnings issued inside it
23 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 9, 8:42 AM CDT | Severe Thunderstorm Warning | SHV | Union | 63 min |
| Oct 9, 8:48 AM CDT | Severe Thunderstorm Warning | SHV | Bienville, De Soto, Jackson, Natchitoches, Red River, Sabine and 1 more | 57 min |
| Oct 9, 8:50 AM CDT | Severe Thunderstorm Warning | LZK | Bradley, Calhoun, Cleveland, Dallas, Grant, Ouachita | 55 min |
| Oct 9, 9:07 AM CDT | Flash Flood Warning | LZK | Grant, Jackson, Jefferson, Lonoke, Monroe, Prairie and 4 more | 3 hr |
| Oct 9, 9:28 AM CDT | Severe Thunderstorm Warning | SHV | Union | 62 min |
| Oct 9, 9:40 AM CDT | Severe Thunderstorm Warning | JAN | Ashley | 80 min |
| Oct 9, 9:42 AM CDT | Severe Thunderstorm Warning | LZK | Bradley, Calhoun, Cleveland, Drew, Grant, Jefferson and 1 more | 63 min |
| Oct 9, 9:49 AM CDT | Severe Thunderstorm Warning | LZK | Arkansas, Jefferson, Lincoln, Monroe, Prairie | 41 min |
| Oct 9, 10:09 AM CDT | Severe Thunderstorm Warning | SHV | Jackson, Ouachita, Union | 51 min |
| Oct 9, 10:22 AM CDT | Severe Thunderstorm Warning | JAN | Franklin, Richland | 68 min |
| Oct 9, 10:26 AM CDT | Severe Thunderstorm Warning | LZK | Arkansas, Desha, Drew, Jefferson, Lincoln, Monroe | 64 min |
| Oct 9, 10:48 AM CDT | Severe Thunderstorm Warning | MEG | Phillips | 42 min |
| Oct 9, 10:49 AM CDT | Severe Thunderstorm Warning | JAN | Ashley, Chicot | 71 min |
| Oct 9, 10:54 AM CDT | Severe Thunderstorm Warning | JAN | Ashley, Chicot | 81 min |
| Oct 9, 11:17 AM CDT | Tornado Warning | JAN | Bolivar | 58 min |
| Oct 9, 11:27 AM CDT | Severe Thunderstorm Warning | MEG | Coahoma, Lafayette, Marshall, Panola, Quitman, Tallahatchie and 2 more | 63 min |
| Oct 9, 11:29 AM CDT | Tornado Warning | JAN | Chicot | 46 min |
| Oct 9, 11:31 AM CDT | Severe Thunderstorm Warning | LZK | Arkansas, Desha | 29 min |
| Oct 9, 11:35 AM CDT | Severe Thunderstorm Warning | JAN | East Carroll | 55 min |
| Oct 9, 12:00 PM CDT | Severe Thunderstorm Warning | JAN | Bolivar, Sunflower | 60 min |
| Oct 9, 12:03 PM CDT | Tornado Warning | JAN | Leflore, Sunflower | 57 min |
| Oct 9, 12:06 PM CDT | Tornado Warning | JAN | Bolivar, Sunflower | 37 min |
| Oct 9, 12:24 PM CDT | Severe Thunderstorm Warning | JAN | Carroll, Grenada, Holmes, Humphreys, Leflore, Sunflower and 1 more | 66 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, 1.6 hours before the alert went out and 170 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
- 1981 J/kg
- Mixed-layer CIN
- -4 J/kg
- Mixed-layer LCL
- 625 m above ground
- 0-6 km bulk shear
- 48 kt
- 0-1 km storm-relative helicity
- 377 m²/s²
- 0-3 km storm-relative helicity
- 416 m²/s²
- Significant tornado parameter
- 5.2
- Supercell composite
- 19.9
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 8, 7:35 PM CDT | Mesoscale Discussion | SPC | Baxter, Boone, Clay, Cleburne, Conway, Craighead and 15 more | 55 min |
| Oct 8, 8:00 PM CDT | Tornado Watch | SPC | Baxter, Boone, Clay, Cleburne, Conway, Craighead and 23 more | 7 hr |
| Oct 8, 11:06 PM CDT | Mesoscale Discussion | SPC | Baxter, Clay, Cleburne, Conway, Craighead, Faulkner and 17 more | 84 min |
| Oct 8, 11:40 PM CDT | Mesoscale Discussion | SPC | Crawford, Sebastian | 95 min |
| Oct 9, 2:38 AM CDT | Mesoscale Discussion | SPC | Clark, Cleburne, Craighead, Crittenden, Cross, Faulkner and 24 more | 52 min |
| Oct 9, 6:59 AM CDT | Mesoscale Discussion | SPC | Arkansas, Ashley, Bradley, Calhoun, Clark, Cleveland and 14 more | 3 hr |
| Oct 9, 8:24 AM CDT | Mesoscale Discussion | SPC | Arkansas, Ashley, Bradley, Calhoun, Chicot, Cleveland and 7 more | 66 min |
| Oct 9, 10:45 AM CDT | Mesoscale Discussion | SPC | Chicot, Desha | 90 min |
| Oct 9, 11:26 AM CDT | Tornado Watch | SPC | Alcorn, Attala, Benton, Calhoun, Carroll, Chickasaw and 27 more | 5 hr |
| Oct 9, 1:41 PM CDT | Mesoscale Discussion | SPC | Attala, Chickasaw, Choctaw, Clay, Itawamba, Kemper and 9 more | 94 min |
| Oct 8, 8:20 PM CDT | Mesoscale Discussion | SPC | Brown, Callahan, Coke, Coleman, Concho, Crockett and 25 more | 115 min |
| Oct 8, 11:53 PM CDT | Mesoscale Discussion | SPC | Brown, Coke, Coleman, Concho, Crockett, Glasscock and 14 more | 97 min |
Nearby
Tornado Watches in Louisiana, 2009Tornado Watches in Arkansas, 2009Tornado Watches in Mississippi, 2009Every tornado watch in 2009
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.