Alert archive / Missouri / Severe Thunderstorm Watches in 2011
Severe Thunderstorm Watch 477
The Storm Prediction Center issued this severe thunderstorm watch at Jun 15, 2011, 1:09 AM CDT for 25 counties in Arkansas; Monroe County, Randolph County, Saint Clair County, Illinois; 41 counties in Missouri. It was in force for 4 hr.
The area
The outline as issued.
The facts
- Issued
- Jun 15, 2011, 1:09 AM CDT (06:09 UTC)
- Expired
- Jun 15, 2011, 5:20 AM CDT
- In force
- 4 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
All 69 counties
Baxter County, AR, Boone County, AR, Clay County, AR, Cleburne County, AR, Conway County, AR, Craighead County, AR, Cross County, AR, Faulkner County, AR, Fulton County, AR, Greene County, AR, Independence County, AR, Izard County, AR, Jackson County, AR, Lawrence County, AR, Marion County, AR, Newton County, AR, Poinsett County, AR, Pope County, AR, Randolph County, AR, Searcy County, AR, Sharp County, AR, Stone County, AR, Van Buren County, AR, White County, AR, Woodruff County, AR, Monroe County, IL, Randolph County, IL, Saint Clair County, IL, Barry County, MO, Bollinger County, MO, Butler County, MO, Camden County, MO, Carter County, MO, Christian County, MO, Cole County, MO, Crawford County, MO, Dallas County, MO, Dent County, MO, Douglas County, MO, Franklin County, MO, Gasconade County, MO, Greene County, MO, Howell County, MO, Iron County, MO, Jefferson County, MO, Laclede County, MO, Lawrence County, MO, Madison County, MO, Maries County, MO, Miller County, MO, Oregon County, MO, Osage County, MO, Ozark County, MO, Perry County, MO, Phelps County, MO, Polk County, MO, Pulaski County, MO, Reynolds County, MO, Ripley County, MO, Saint Francois County, MO, Sainte Genevieve County, MO, Shannon County, MO, Stone County, MO, Taney County, MO, Texas County, MO, Washington County, MO, Wayne County, MO, Webster County, MO, Wright County, MO
The radar
The Springfield radar (KSGF), 146 km from the middle of the area, began a volume at 06:12 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
- 20%
- One or more EF2 to EF5 tornadoes
- 5%
- 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
- 20%
- Six or more combined severe hail and wind reports
- 70%
Warnings issued inside it
4 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 15, 1:43 AM CDT | Severe Thunderstorm Warning | SGF | Camden, Maries, Miller, Pulaski | 33 min |
| Jun 15, 1:55 AM CDT | Severe Thunderstorm Warning | LZK | Baxter, Cleburne, Conway, Pope, Searcy, Stone and 1 more | 50 min |
| Jun 15, 3:43 AM CDT | Severe Thunderstorm Warning | MEG | Clay, Randolph | 32 min |
| Jun 15, 3:59 AM CDT | Severe Thunderstorm Warning | PAH | Ripley | 21 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, 6.2 hours before the alert went out and 161 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
- 2959 J/kg
- Mixed-layer CIN
- -37 J/kg
- Mixed-layer LCL
- 1347 m above ground
- 0-6 km bulk shear
- 26 kt
- 0-1 km storm-relative helicity
- 205 m²/s²
- 0-3 km storm-relative helicity
- 240 m²/s²
- Significant tornado parameter
- 1.7
- Supercell composite
- 14.6
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 15, 12:29 AM CDT | Mesoscale Discussion | SPC | Baxter, Boone, Carroll, Clay, Cleburne, Fulton and 13 more | 2 hr |
| Jun 15, 4:24 AM CDT | Mesoscale Discussion | SPC | Clay | 96 min |
| Jun 15, 10:54 AM CDT | Mesoscale Discussion | SPC | Arkansas, Crittenden, Desha, Lee, Mississippi, Monroe and 2 more | 2 hr |
| Jun 15, 1:57 PM CDT | Mesoscale Discussion | SPC | Clark, Garland, Hempstead, Hot Spring, Howard, Little River and 9 more | 63 min |
| Jun 15, 1:55 AM CDT | Mesoscale Discussion | SPC | Adams, Brown, Calhoun, Cass, Christian, DeWitt and 22 more | 3 hr |
| Jun 15, 2:13 PM CDT | Mesoscale Discussion | SPC | Alexander, Clay, Clinton, Cumberland, DeWitt, Edwards and 27 more | 2 hr |
| Jun 14, 7:47 PM CDT | Mesoscale Discussion | SPC | Adair, Andrew, Audrain, Bates, Benton, Boone and 43 more | 58 min |
| Jun 14, 8:54 PM CDT | Mesoscale Discussion | SPC | Newton | 66 min |
| Jun 14, 9:11 PM CDT | Mesoscale Discussion | SPC | Barry, Barton, Camden, Cedar, Christian, Dade and 23 more | 64 min |
Nearby
Severe Thunderstorm Watches in Missouri, 2011Severe Thunderstorm Watches in Arkansas, 2011Severe Thunderstorm Watches in Illinois, 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.