Alert archive / Louisiana / Severe Thunderstorm Watches in 2010
Severe Thunderstorm Watch 710
The Storm Prediction Center issued this severe thunderstorm watch at Oct 24, 2010, 9:57 PM CDT for 17 parishes in Louisiana; 13 counties in Texas. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Oct 24, 2010, 9:57 PM CDT (02:57 UTC)
- Expired
- Oct 25, 2010, 4:00 AM CDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2.5 in
- Strongest gust expected
- 60 kt
All 30 counties
Bienville Parish, LA, Bossier Parish, LA, Caddo Parish, LA, Caldwell Parish, LA, Claiborne Parish, LA, De Soto Parish, LA, Grant Parish, LA, Jackson Parish, LA, LaSalle 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, Anderson County, TX, Cherokee County, TX, Gregg County, TX, Harrison County, TX, Henderson County, TX, Kaufman County, TX, Marion County, TX, Nacogdoches County, TX, Panola County, TX, Rusk County, TX, Shelby County, TX, Smith County, TX, Van Zandt County, TX
The radar
The Shreveport radar (KSHV), 46 km from the middle of the area, began a volume at 02:59 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
- 20%
- One or more EF2 to EF5 tornadoes
- 5%
- Ten or more severe wind reports
- 30%
- 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
- 30%
- Six or more combined severe hail and wind reports
- 70%
Warnings issued inside it
7 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 24, 10:07 PM CDT | Severe Thunderstorm Warning | SHV | Bossier, Caddo | 53 min |
| Oct 24, 10:33 PM CDT | Severe Thunderstorm Warning | SHV | Bossier, Claiborne, Webster | 57 min |
| Oct 24, 10:41 PM CDT | Severe Thunderstorm Warning | SHV | Cherokee, Rusk, Smith | 49 min |
| Oct 24, 10:44 PM CDT | Severe Thunderstorm Warning | SHV | Cherokee, Smith | 31 min |
| Oct 24, 10:58 PM CDT | Severe Thunderstorm Warning | SHV | Harrison | 32 min |
| Oct 25, 12:33 AM CDT | Severe Thunderstorm Warning | SHV | Bienville, Bossier, Claiborne, Lincoln, Webster | 57 min |
| Oct 25, 1:31 AM CDT | Severe Thunderstorm Warning | SHV | Bienville, Claiborne, Lincoln, Webster | 44 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 00:00Z, 3.0 hours before the alert went out and 39 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
- 968 J/kg
- Mixed-layer CIN
- -50 J/kg
- Mixed-layer LCL
- 1928 m above ground
- 0-6 km bulk shear
- 48 kt
- 0-1 km storm-relative helicity
- 102 m²/s²
- 0-3 km storm-relative helicity
- 228 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 6.9
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 24, 8:23 PM CDT | Mesoscale Discussion | SPC | East Carroll, Madison, Morehouse, West Carroll | 67 min |
| Oct 24, 8:46 PM CDT | Severe Thunderstorm Watch | SPC | East Carroll, Franklin, Madison, Morehouse, Richland, Tensas and 1 more | 7 hr |
| Oct 24, 11:35 PM CDT | Mesoscale Discussion | SPC | East Carroll, Franklin, Madison, West Carroll | 55 min |
| Oct 25, 1:44 AM CDT | Mesoscale Discussion | SPC | Bienville, Bossier, Caddo, Caldwell, Claiborne, De Soto and 9 more | 2 hr |
Nearby
Severe Thunderstorm Watches in Louisiana, 2010Severe Thunderstorm Watches in Texas, 2010Every severe thunderstorm 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.