Alert archive / Arkansas / Tornado Watches in 2009
Tornado Watch 783
The Storm Prediction Center issued this tornado watch at Oct 29, 2009, 1:51 PM CDT for 19 counties in Arkansas. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Oct 29, 2009, 1:51 PM CDT (18:51 UTC)
- Expired
- Oct 29, 2009, 8:48 PM CDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1 in
- Strongest gust expected
- 60 kt
Counties Bradley County, AR, Calhoun County, AR, Clark County, AR, Cleveland County, AR, Dallas County, AR, Garland County, AR, Grant County, AR, Hot Spring County, AR, Jefferson County, AR, Lonoke County, AR, Montgomery County, AR, Ouachita County, AR, Perry County, AR, Pike County, AR, Polk County, AR, Pulaski County, AR, Saline County, AR, Scott County, AR, Yell County, AR
The radar
The Little Rock radar (KLZK), 135 km from the middle of the area, began a volume at 18:53 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
- 20%
- Ten or more severe wind reports
- 30%
- One or more gusts of 65 knots or more
- 30%
- Ten or more severe hail reports
- 30%
- One or more hailstones of 2 inches or more
- 30%
- 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 |
|---|---|---|---|---|
| Oct 29, 2:08 PM CDT | Severe Thunderstorm Warning | LZK | Bradley, Calhoun, Cleveland, Dallas, Ouachita | 37 min |
| Oct 29, 3:10 PM CDT | Tornado Warning | LZK | Calhoun, Ouachita | 50 min |
| Oct 29, 3:45 PM CDT | Tornado Warning | LZK | Jefferson | 45 min |
| Oct 29, 3:52 PM CDT | Tornado Warning | LZK | Calhoun, Cleveland, Dallas, Grant, Ouachita | 38 min |
| Oct 29, 4:15 PM CDT | Severe Thunderstorm Warning | LZK | Polk, Scott | 45 min |
| Oct 29, 4:33 PM CDT | Severe Thunderstorm Warning | LZK | Cleveland, Dallas, Grant, Jefferson | 42 min |
| Oct 29, 5:26 PM CDT | Flash Flood Warning | LZK | Calhoun, Clark, Cleveland, Dallas, Grant, Hot Spring and 2 more | 4 hr |
| Oct 29, 5:26 PM CDT | Severe Thunderstorm Warning | LZK | Johnson, Logan, Scott, Yell | 49 min |
| Oct 29, 5:39 PM CDT | Severe Thunderstorm Warning | LZK | Grant, Jefferson, Lonoke, Prairie, Pulaski, Saline | 51 min |
| Oct 29, 5:53 PM CDT | Severe Thunderstorm Warning | LZK | Polk | 52 min |
| Oct 29, 6:00 PM CDT | Tornado Warning | LZK | Ouachita | 45 min |
| Oct 29, 6:02 PM CDT | Tornado Warning | LZK | Lonoke, Pulaski | 26 min |
| Oct 29, 6:18 PM CDT | Flash Flood Warning | LZK | Polk, Scott | 3 hr |
| Oct 29, 6:30 PM CDT | Severe Thunderstorm Warning | LZK | Logan, Polk, Scott, Yell | 45 min |
| Oct 29, 6:30 PM CDT | Severe Thunderstorm Warning | LZK | Lonoke, Prairie, White, Woodruff | 45 min |
| Oct 29, 6:35 PM CDT | Tornado Warning | LZK | Cleveland, Dallas, Ouachita | 40 min |
| Oct 29, 6:53 PM CDT | Severe Thunderstorm Warning | LZK | Ouachita | 37 min |
| Oct 29, 7:12 PM CDT | Flash Flood Warning | LZK | Calhoun, Clark, Cleburne, Cleveland, Conway, Dallas and 22 more | 6 hr |
| Oct 29, 8:39 PM CDT | Flash Flood Warning | LZK | Cleburne, Fulton, Independence, Izard, Jackson, Lonoke and 6 more | 10 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
Shreveport, LA (KSHV), launched 12:00Z, 6.9 hours before the alert went out and 194 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
- 387 J/kg
- Mixed-layer CIN
- -88 J/kg
- Mixed-layer LCL
- 453 m above ground
- 0-6 km bulk shear
- 35 kt
- 0-1 km storm-relative helicity
- 350 m²/s²
- 0-3 km storm-relative helicity
- 422 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 2.7
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 29, 1:14 PM CDT | Tornado Watch | SPC | Columbia, Hempstead, Howard, Lafayette, Little River, Miller and 3 more | 8 hr |
| Oct 29, 1:57 PM CDT | Mesoscale Discussion | SPC | Washington | 2 hr |
| Oct 29, 3:03 PM CDT | Mesoscale Discussion | SPC | Bradley, Calhoun, Clark, Cleveland, Columbia, Dallas and 23 more | 117 min |
| Oct 29, 5:24 PM CDT | Mesoscale Discussion | SPC | Columbia, Hempstead, Howard, Lafayette, Little River, Miller and 3 more | 66 min |
| Oct 29, 5:27 PM CDT | Tornado Watch | SPC | Baxter, Boone, Carroll, Cleburne, Conway, Crawford and 22 more | 3 hr |
Nearby
Tornado Watches in Arkansas, 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.