Alert archive / Arkansas / Tornado Watches in 2010
Tornado Watch 649
The Storm Prediction Center issued this tornado watch at Sep 8, 2010, 10:12 PM CDT for 17 counties in Arkansas. It was in force for 4 hr.
The area
The outline as issued.
The facts
- Issued
- Sep 8, 2010, 10:12 PM CDT (03:12 UTC)
- Expired
- Sep 9, 2010, 1:45 AM CDT
- In force
- 4 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1 in
- Strongest gust expected
- 60 kt
Counties Clark County, AR, Conway County, AR, Dallas County, AR, Faulkner County, AR, Garland County, AR, Grant County, AR, Hot Spring County, AR, Logan County, AR, Montgomery County, AR, Perry County, AR, Pike County, AR, Polk County, AR, Pope County, AR, Pulaski County, AR, Saline County, AR, Scott County, AR, Yell County, AR
The radar
The Western Arkansas radar (KSRX), 102 km from the middle of the area, began a volume at 03:15 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
- 10%
- One or more gusts of 65 knots or more
- 5%
- Ten or more severe hail reports
- 10%
- One or more hailstones of 2 inches or more
- 5%
- Six or more combined severe hail and wind reports
- 20%
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
Springfield, MO (KSGF), launched 00:00Z, 3.2 hours before the alert went out and 242 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
- 124 J/kg
- Mixed-layer CIN
- -41 J/kg
- Mixed-layer LCL
- 747 m above ground
- 0-6 km bulk shear
- 9 kt
- 0-1 km storm-relative helicity
- 17 m²/s²
- 0-3 km storm-relative helicity
- 64 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 8, 9:52 PM CDT | Mesoscale Discussion | SPC | Clark, Hempstead, Howard, Little River, Montgomery, Nevada and 4 more | 113 min |
| Sep 9, 3:05 PM CDT | Mesoscale Discussion | SPC | Cleburne, Independence, Newton, Searcy, Stone, Van Buren and 1 more | 55 min |
| Sep 9, 4:39 PM CDT | Mesoscale Discussion | SPC | Cleburne, Conway, Craighead, Crittenden, Cross, Faulkner and 13 more | 96 min |
| Sep 9, 6:26 PM CDT | Tornado Watch | SPC | Clay, Craighead, Crittenden, Cross, Greene, Lawrence and 4 more | 3 hr |
Nearby
Tornado Watches in Arkansas, 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.