Alert archive / Arkansas / Severe Thunderstorm Watches in 2007
Severe Thunderstorm Watch 122
The Storm Prediction Center issued this severe thunderstorm watch at Apr 10, 2007, 11:45 PM CDT for 29 counties in Arkansas. It was in force for 4 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 10, 2007, 11:45 PM CDT (04:45 UTC)
- Expired
- Apr 11, 2007, 4:12 AM CDT
- In force
- 4 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
All 29 counties
Arkansas County, AR, Bradley County, AR, Calhoun County, AR, Clark County, AR, Cleveland County, AR, Dallas County, AR, Desha County, AR, Drew County, AR, Faulkner County, AR, Garland County, AR, Grant County, AR, Hempstead County, AR, Hot Spring County, AR, Howard County, AR, Jefferson County, AR, Lincoln County, AR, Lonoke County, AR, Monroe County, AR, Montgomery County, AR, Nevada County, AR, Ouachita County, AR, Perry County, AR, Pike County, AR, Polk County, AR, Prairie County, AR, Pulaski County, AR, Saline County, AR, White County, AR, Woodruff County, AR
The radar
The Little Rock radar (KLZK), 64 km from the middle of the area, began a volume at 04:46 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
- 10%
- One or more EF2 to EF5 tornadoes
- 5%
- Ten or more severe wind reports
- 30%
- One or more gusts of 65 knots or more
- 20%
- Ten or more severe hail reports
- 50%
- One or more hailstones of 2 inches or more
- 20%
- Six or more combined severe hail and wind reports
- 70%
Warnings issued inside it
19 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 10, 11:51 PM CDT | Severe Thunderstorm Warning | LZK | Perry, Saline | 39 min |
| Apr 10, 11:53 PM CDT | Severe Thunderstorm Warning | LZK | Garland | 52 min |
| Apr 10, 11:58 PM CDT | Severe Thunderstorm Warning | LZK | Pike | 47 min |
| Apr 11, 12:01 AM CDT | Severe Thunderstorm Warning | LZK | Polk | 44 min |
| Apr 11, 12:01 AM CDT | Severe Thunderstorm Warning | SHV | Hempstead | 59 min |
| Apr 11, 12:16 AM CDT | Severe Thunderstorm Warning | LZK | Pulaski | 44 min |
| Apr 11, 12:20 AM CDT | Severe Thunderstorm Warning | LZK | Hot Spring, Saline | 55 min |
| Apr 11, 12:22 AM CDT | Severe Thunderstorm Warning | SHV | Nevada | 38 min |
| Apr 11, 12:30 AM CDT | Severe Thunderstorm Warning | SHV | Howard | 45 min |
| Apr 11, 12:33 AM CDT | Severe Thunderstorm Warning | LZK | Clark | 42 min |
| Apr 11, 12:38 AM CDT | Severe Thunderstorm Warning | LZK | Montgomery, Pike | 52 min |
| Apr 11, 12:58 AM CDT | Severe Thunderstorm Warning | LZK | Pulaski | 47 min |
| Apr 11, 1:06 AM CDT | Severe Thunderstorm Warning | LZK | Clark | 54 min |
| Apr 11, 1:17 AM CDT | Severe Thunderstorm Warning | LZK | Hot Spring | 43 min |
| Apr 11, 1:45 AM CDT | Severe Thunderstorm Warning | LZK | Dallas | 60 min |
| Apr 11, 1:52 AM CDT | Tornado Warning | LZK | Dallas | 38 min |
| Apr 11, 1:58 AM CDT | Severe Thunderstorm Warning | LZK | Grant | 47 min |
| Apr 11, 2:15 AM CDT | Tornado Warning | LZK | Cleveland | 45 min |
| Apr 11, 2:48 AM CDT | Severe Thunderstorm Warning | LZK | Lincoln | 42 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, 4.8 hours before the alert went out and 249 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
- 200 J/kg
- Mixed-layer CIN
- -180 J/kg
- Mixed-layer LCL
- 623 m above ground
- 0-6 km bulk shear
- 51 kt
- 0-1 km storm-relative helicity
- 417 m²/s²
- 0-3 km storm-relative helicity
- 552 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 10, 9:19 PM CDT | Mesoscale Discussion | SPC | Howard, Little River, Polk, Scott, Sebastian, Sevier | 56 min |
| Apr 10, 11:24 PM CDT | Mesoscale Discussion | SPC | Arkansas, Ashley, Bradley, Calhoun, Clark, Cleburne and 42 more | 96 min |
| Apr 11, 2:19 AM CDT | Mesoscale Discussion | SPC | Arkansas, Ashley, Bradley, Calhoun, Chicot, Cleveland and 14 more | 116 min |
| Apr 11, 2:56 AM CDT | Severe Thunderstorm Watch | SPC | Ashley, Chicot, Lee, Phillips | 5 hr |
Nearby
Severe Thunderstorm Watches in Arkansas, 2007Every severe thunderstorm 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.