Alert archive / Arkansas / Severe Thunderstorm Watches in 2011
Severe Thunderstorm Watch 321
The Storm Prediction Center issued this severe thunderstorm watch at May 22, 2011, 7:03 AM CDT for 36 counties in Arkansas; 17 counties in Mississippi; 13 counties in Tennessee. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- May 22, 2011, 7:03 AM CDT (12:03 UTC)
- Expired
- May 22, 2011, 2:00 PM CDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
All 66 counties
Arkansas County, AR, Bradley County, AR, Calhoun County, AR, Clark County, AR, Cleveland County, AR, Conway County, AR, Craighead County, AR, Crittenden County, AR, Cross County, AR, Dallas County, AR, Desha County, AR, Drew County, AR, Faulkner County, AR, Garland County, AR, Grant County, AR, Hot Spring County, AR, Jackson County, AR, Jefferson County, AR, Lee County, AR, Lincoln County, AR, Lonoke County, AR, Mississippi County, AR, Monroe County, AR, Montgomery County, AR, Ouachita County, AR, Perry County, AR, Phillips County, AR, Pike County, AR, Poinsett County, AR, Prairie County, AR, Pulaski County, AR, Saline County, AR, St. Francis County, AR, White County, AR, Woodruff County, AR, Yell County, AR, Alcorn County, MS, Benton County, MS, Coahoma County, MS, DeSoto County, MS, Itawamba County, MS, Lafayette County, MS, Lee County, MS, Marshall County, MS, Panola County, MS, Pontotoc County, MS, Prentiss County, MS, Quitman County, MS, Tate County, MS, Tippah County, MS, Tishomingo County, MS, Tunica County, MS, Union County, MS, Chester County, TN, Crockett County, TN, Decatur County, TN, Fayette County, TN, Hardeman County, TN, Hardin County, TN, Haywood County, TN, Henderson County, TN, Lauderdale County, TN, Madison County, TN, McNairy County, TN, Shelby County, TN, Tipton County, TN
The radar
The Little Rock radar (KLZK), 66 km from the middle of the area, began a volume at 12:04 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
- 20%
- One or more gusts of 65 knots or more
- 10%
- 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
- 80%
Warnings issued inside it
20 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 22, 7:09 AM CDT | Severe Thunderstorm Warning | LZK | Garland, Montgomery | 51 min |
| May 22, 7:11 AM CDT | Severe Thunderstorm Warning | LZK | Arkansas, Monroe | 31 min |
| May 22, 7:15 AM CDT | Severe Thunderstorm Warning | LZK | Cleveland, Jefferson, Lincoln | 45 min |
| May 22, 7:38 AM CDT | Severe Thunderstorm Warning | LZK | Hot Spring, Pulaski, Saline | 37 min |
| May 22, 8:34 AM CDT | Severe Thunderstorm Warning | LZK | Faulkner, White | 17 min |
| May 22, 9:15 AM CDT | Flash Flood Warning | MEG | DeSoto, Marshall, Tate | 7 hr |
| May 22, 9:29 AM CDT | Severe Thunderstorm Warning | LZK | Garland, Hot Spring, Saline | 46 min |
| May 22, 9:54 AM CDT | Severe Thunderstorm Warning | LZK | Clark, Dallas, Hot Spring | 27 min |
| May 22, 10:02 AM CDT | Flash Flood Warning | MEG | Crittenden, Lee, Phillips, St. Francis | 5 hr |
| May 22, 10:17 AM CDT | Severe Thunderstorm Warning | LZK | Pulaski, Saline | 33 min |
| May 22, 10:36 AM CDT | Severe Thunderstorm Warning | LZK | Woodruff | 39 min |
| May 22, 10:44 AM CDT | Severe Thunderstorm Warning | MEG | Crittenden, Cross, Poinsett, St. Francis | 46 min |
| May 22, 10:45 AM CDT | Severe Thunderstorm Warning | LZK | Lonoke, Pulaski, Saline | 45 min |
| May 22, 11:23 AM CDT | Flash Flood Warning | LZK | Pulaski, Saline | 3 hr |
| May 22, 11:29 AM CDT | Severe Thunderstorm Warning | MEG | Craighead, Crittenden, Cross, Mississippi, Poinsett | 46 min |
| May 22, 11:33 AM CDT | Severe Thunderstorm Warning | LZK | Lonoke, Prairie, Pulaski | 42 min |
| May 22, 12:14 PM CDT | Flash Flood Warning | MEG | Crittenden, Cross, St. Francis | 3 hr |
| May 22, 12:32 PM CDT | Flash Flood Warning | MEG | Crittenden | 2 hr |
| May 22, 12:43 PM CDT | Severe Thunderstorm Warning | LZK | Grant, Lonoke, Pulaski, Saline | 47 min |
| May 22, 12:49 PM CDT | Severe Thunderstorm Warning | LZK | Arkansas, Monroe, Prairie | 41 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
Little Rock, AR (KLZK), launched 12:00Z, 0.1 hours before the alert went out and 151 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
- 1953 J/kg
- Mixed-layer CIN
- -164 J/kg
- Mixed-layer LCL
- 768 m above ground
- 0-6 km bulk shear
- 37 kt
- 0-1 km storm-relative helicity
- 142 m²/s²
- 0-3 km storm-relative helicity
- 154 m²/s²
- Significant tornado parameter
- 0.3
- Supercell composite
- 5.2
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 21, 8:31 PM CDT | Mesoscale Discussion | SPC | Arkansas, Ashley, Bradley, Calhoun, Clark, Cleburne and 45 more | 89 min |
| May 22, 5:18 AM CDT | Mesoscale Discussion | SPC | Arkansas, Calhoun, Clark, Cleburne, Cleveland, Conway and 32 more | 57 min |
| May 22, 11:15 AM CDT | Mesoscale Discussion | SPC | Arkansas, Bradley, Calhoun, Clark, Cleveland, Conway and 26 more | 90 min |
| May 22, 1:06 PM CDT | Mesoscale Discussion | SPC | Baxter, Benton, Boone, Carroll, Fulton, Marion | 114 min |
| May 22, 1:09 PM CDT | Mesoscale Discussion | SPC | Arkansas, Crittenden, Cross, Grant, Jefferson, Lee and 7 more | 66 min |
| May 22, 1:27 PM CDT | Tornado Watch | SPC | Benton, Carroll, Crawford, Franklin, Madison, Sebastian and 1 more | 8 hr |
| May 22, 3:10 PM CDT | Mesoscale Discussion | SPC | Baxter, Boone, Cleburne, Independence, Izard, Jackson and 9 more | 65 min |
| May 22, 3:24 PM CDT | Tornado Watch | SPC | Baxter, Boone, Clay, Cleburne, Conway, Craighead and 22 more | 6 hr |
| May 22, 3:48 PM CDT | Mesoscale Discussion | SPC | Benton, Carroll, Crawford, Franklin, Madison, Washington | 117 min |
| May 22, 5:21 PM CDT | Mesoscale Discussion | SPC | Baxter, Boone, Carroll, Clay, Cleburne, Conway and 22 more | 54 min |
| May 22, 6:10 PM CDT | Mesoscale Discussion | SPC | Benton, Carroll, Crawford, Franklin, Madison, Washington | 65 min |
| May 22, 12:55 PM CDT | Mesoscale Discussion | SPC | Anderson, Bedford, Bledsoe, Blount, Bradley, Campbell and 51 more | 65 min |
| May 22, 1:18 PM CDT | Severe Thunderstorm Watch | SPC | Anderson, Bedford, Bledsoe, Blount, Bradley, Campbell and 64 more | 7 hr |
| May 22, 3:44 PM CDT | Mesoscale Discussion | SPC | Anderson, Blount, Campbell, Carter, Claiborne, Cocke and 17 more | 61 min |
| May 22, 6:26 PM CDT | Mesoscale Discussion | SPC | Carter, Cocke, Greene, Hamblen, Hawkins, Johnson and 3 more | 2 hr |
Nearby
Severe Thunderstorm Watches in Arkansas, 2011Severe Thunderstorm Watches in Mississippi, 2011Severe Thunderstorm Watches in Tennessee, 2011Every severe thunderstorm watch in 2011
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.