Alert archive / Louisiana / Tornado Watches in 2010
Tornado Watch 287
The Storm Prediction Center issued this tornado watch at Jun 9, 2010, 1:07 PM CDT for 9 counties in Arkansas; 14 parishes in Louisiana; 9 counties in Texas. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Jun 9, 2010, 1:07 PM CDT (18:07 UTC)
- Expired
- Jun 9, 2010, 7:00 PM CDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1 in
- Strongest gust expected
- 60 kt
All 32 counties
Columbia County, AR, Hempstead County, AR, Howard County, AR, Lafayette County, AR, Little River County, AR, Miller County, AR, Nevada County, AR, Sevier County, AR, Union County, AR, Bienville Parish, LA, Bossier Parish, LA, Caddo Parish, LA, Claiborne Parish, LA, De Soto Parish, LA, Jackson Parish, LA, Lincoln Parish, LA, Natchitoches Parish, LA, Ouachita Parish, LA, Red River Parish, LA, Sabine Parish, LA, Union Parish, LA, Webster Parish, LA, Winn Parish, LA, Bowie County, TX, Cass County, TX, Harrison County, TX, Marion County, TX, Morris County, TX, Red River County, TX, Sabine County, TX, San Augustine County, TX, Titus County, TX
The radar
The Shreveport radar (KSHV), 55 km from the middle of the area, began a volume at 18:09 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
- 10%
- Ten or more severe wind reports
- 40%
- 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
- 5%
- 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 |
|---|---|---|---|---|
| Jun 9, 1:33 PM CDT | Severe Thunderstorm Warning | SHV | Columbia, Hempstead, Lafayette, Little River, Miller | 57 min |
| Jun 9, 1:44 PM CDT | Severe Thunderstorm Warning | SHV | Bienville, Bossier, Caddo, Claiborne, De Soto, Red River and 1 more | 61 min |
| Jun 9, 3:04 PM CDT | Severe Thunderstorm Warning | SHV | De Soto, Red River | 26 min |
| Jun 9, 3:59 PM CDT | Severe Thunderstorm Warning | SHV | Union | 61 min |
| Jun 9, 5:02 PM CDT | Severe Thunderstorm Warning | SHV | Ouachita, Union | 58 min |
| Jun 9, 5:21 PM CDT | Severe Thunderstorm Warning | SHV | Bienville, Caldwell, Jackson, Natchitoches, Ouachita, Winn | 54 min |
| Jun 9, 5:32 PM CDT | Severe Thunderstorm Warning | SHV | Ouachita | 28 min |
| Jun 9, 5:45 PM CDT | Flash Flood Warning | SHV | Ouachita | 3 hr |
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, 6.1 hours before the alert went out and 321 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
- 3174 J/kg
- Mixed-layer CIN
- -12 J/kg
- Mixed-layer LCL
- 576 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- 87 m²/s²
- 0-3 km storm-relative helicity
- 88 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 3.8
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 9, 2:29 PM CDT | Mesoscale Discussion | SPC | Bradley, Calhoun, Columbia, Lafayette, Miller, Nevada and 2 more | 91 min |
| Jun 9, 5:58 PM CDT | Mesoscale Discussion | SPC | Ashley, Chicot, Desha, Drew | 62 min |
| Jun 9, 11:15 AM CDT | Mesoscale Discussion | SPC | De Soto | 90 min |
| Jun 8, 11:53 PM CDT | Mesoscale Discussion | SPC | Atascosa, Comal | 3 hr |
| Jun 9, 7:31 AM CDT | Mesoscale Discussion | SPC | Austin, Brazoria, Brazos, Chambers, Colorado, Fort Bend and 21 more | 59 min |
| Jun 9, 8:46 AM CDT | Tornado Watch | SPC | Anderson, Angelina, Austin, Brazos, Cherokee, Colorado and 30 more | 7 hr |
Nearby
Tornado Watches in Louisiana, 2010Tornado Watches in Arkansas, 2010Tornado Watches in Texas, 2010Every tornado watch in 2010
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.