Alert archive / Missouri / Severe Thunderstorm Watches in 2011
Severe Thunderstorm Watch 183
The Storm Prediction Center issued this severe thunderstorm watch at Apr 22, 2011, 11:04 PM CDT for 4 states. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 22, 2011, 11:04 PM CDT (04:04 UTC)
- Expired
- Apr 23, 2011, 6:00 AM CDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 3 in
- Strongest gust expected
- 60 kt
All 47 counties
Baxter County, AR, Benton County, AR, Boone County, AR, Carroll County, AR, Madison County, AR, Marion County, AR, Newton County, AR, Searcy County, AR, Washington County, AR, Cherokee County, KS, Barry County, MO, Barton County, MO, Camden County, MO, Cedar County, MO, Christian County, MO, Dade County, MO, Dallas County, MO, Dent County, MO, Douglas County, MO, Greene County, MO, Howell County, MO, Jasper County, MO, Laclede County, MO, Lawrence County, MO, Maries County, MO, McDonald County, MO, Newton County, MO, Oregon County, MO, Ozark County, MO, Phelps County, MO, Polk County, MO, Pulaski County, MO, Shannon County, MO, Stone County, MO, Taney County, MO, Texas County, MO, Webster County, MO, Wright County, MO, Adair County, OK, Cherokee County, OK, Craig County, OK, Delaware County, OK, Mayes County, OK, Nowata County, OK, Ottawa County, OK, Rogers County, OK, Wagoner County, OK
The radar
The Springfield radar (KSGF), 45 km from the middle of the area, began a volume at 04:04 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
- 2%
- Ten or more severe wind reports
- 30%
- One or more gusts of 65 knots or more
- 30%
- Ten or more severe hail reports
- 60%
- One or more hailstones of 2 inches or more
- 30%
- Six or more combined severe hail and wind reports
- 80%
Warnings issued inside it
15 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 22, 11:18 PM CDT | Severe Thunderstorm Warning | SGF | Dent, Texas | 31 min |
| Apr 23, 12:29 AM CDT | Severe Thunderstorm Warning | SGF | Dent, Shannon, Texas | 42 min |
| Apr 23, 12:39 AM CDT | Severe Thunderstorm Warning | TSA | Benton, Carroll, Madison | 52 min |
| Apr 23, 12:40 AM CDT | Severe Thunderstorm Warning | SGF | Shannon | 35 min |
| Apr 23, 1:19 AM CDT | Severe Thunderstorm Warning | SGF | Barry, Stone, Taney | 56 min |
| Apr 23, 3:29 AM CDT | Flash Flood Warning | SGF | Dade, Dallas, Polk | 6 hr |
| Apr 23, 3:34 AM CDT | Severe Thunderstorm Warning | SGF | Dallas, Greene, Laclede, Webster | 45 min |
| Apr 23, 3:48 AM CDT | Severe Thunderstorm Warning | SGF | Laclede, Pulaski | 49 min |
| Apr 23, 3:54 AM CDT | Flash Flood Warning | SGF | Laclede, Pulaski | 5 hr |
| Apr 23, 4:01 AM CDT | Severe Thunderstorm Warning | SGF | Laclede, Wright | 35 min |
| Apr 23, 4:11 AM CDT | Severe Thunderstorm Warning | SGF | Dent, Phelps, Pulaski, Texas | 27 min |
| Apr 23, 4:16 AM CDT | Severe Thunderstorm Warning | TSA | Cherokee, Mayes, Wagoner | 29 min |
| Apr 23, 4:52 AM CDT | Severe Thunderstorm Warning | TSA | Adair, Cherokee, Delaware, Mayes | 38 min |
| Apr 23, 5:26 AM CDT | Severe Thunderstorm Warning | TSA | Benton | 34 min |
| Apr 23, 5:56 AM CDT | Severe Thunderstorm Warning | SGF | McDonald | 64 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
Springfield, MO (KSGF), launched 00:00Z, 4.1 hours before the alert went out and 84 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
- 2835 J/kg
- Mixed-layer CIN
- -10 J/kg
- Mixed-layer LCL
- 640 m above ground
- 0-6 km bulk shear
- 60 kt
- 0-1 km storm-relative helicity
- 231 m²/s²
- 0-3 km storm-relative helicity
- 254 m²/s²
- Significant tornado parameter
- 4.7
- Supercell composite
- 18.1
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 22, 7:29 PM CDT | Mesoscale Discussion | SPC | Baxter, Boone, Clay, Fulton, Greene, Izard and 7 more | 91 min |
| Apr 22, 8:09 PM CDT | Mesoscale Discussion | SPC | Benton, Carroll, Crawford, Madison, Washington | 96 min |
| Apr 22, 9:39 PM CDT | Mesoscale Discussion | SPC | Carroll, Crawford, Franklin, Madison, Sebastian, Washington | 66 min |
| Apr 22, 11:10 PM CDT | Mesoscale Discussion | SPC | Baxter, Benton, Boone, Carroll, Crawford, Franklin and 4 more | 2 hr |
| Apr 23, 2:33 AM CDT | Mesoscale Discussion | SPC | Benton, Boone, Carroll, Madison, Marion, Washington | 87 min |
| Apr 23, 5:06 AM CDT | Mesoscale Discussion | SPC | Benton, Boone, Carroll, Madison, Marion, Newton and 1 more | 24 min |
| Apr 23, 1:04 PM CDT | Mesoscale Discussion | SPC | Clay, Craighead, Mississippi | 86 min |
| Apr 23, 5:02 PM CDT | Mesoscale Discussion | SPC | Baxter, Clay, Cleburne, Conway, Craighead, Crawford and 21 more | 58 min |
| Apr 23, 5:09 PM CDT | Mesoscale Discussion | SPC | Baxter, Clay, Fulton, Randolph | 2 hr |
| Apr 23, 5:38 PM CDT | Severe Thunderstorm Watch | SPC | Baxter, Benton, Boone, Carroll, Clay, Cleburne and 30 more | 6 hr |
| Apr 22, 9:20 PM CDT | Mesoscale Discussion | SPC | Bollinger, Cape Girardeau, Iron, Jefferson, Madison, Mississippi and 9 more | 55 min |
| Apr 23, 1:04 AM CDT | Tornado Watch | SPC | Bollinger, Butler, Cape Girardeau, Carter, Crawford, Iron and 11 more | 4 hr |
| Apr 23, 3:41 AM CDT | Mesoscale Discussion | SPC | Bollinger, Cape Girardeau, Madison, Mississippi, Perry, Sainte Genevieve and 3 more | 94 min |
| Apr 22, 11:35 PM CDT | Severe Thunderstorm Watch | SPC | Atoka, Carter, Cleveland, Coal, Comanche, Cotton and 19 more | 4 hr |
| Apr 23, 2:08 AM CDT | Mesoscale Discussion | SPC | Latimer, LeFlore, Pittsburg, Pushmataha | 67 min |
| Apr 23, 12:56 PM CDT | Mesoscale Discussion | SPC | Bryan, Carter, Choctaw, Jefferson, Johnston, Love and 2 more | 64 min |
| Apr 23, 3:05 PM CDT | Severe Thunderstorm Watch | SPC | Atoka, Bryan, Carter, Choctaw, Coal, Cotton and 11 more | 9 hr |
Nearby
Severe Thunderstorm Watches in Missouri, 2011Severe Thunderstorm Watches in Arkansas, 2011Severe Thunderstorm Watches in Oklahoma, 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.