Alert archive / Illinois / Tornado Watches in 2010
Tornado Watch 770
The Storm Prediction Center issued this tornado watch at Dec 31, 2010, 11:42 AM CST for 5 states. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Dec 31, 2010, 11:42 AM CST (17:42 UTC)
- Expired
- Dec 31, 2010, 7:00 PM CST
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1 in
- Strongest gust expected
- 60 kt
All 48 counties
Clay County, AR, Craighead County, AR, Greene County, AR, Lawrence County, AR, Mississippi County, AR, Poinsett County, AR, Randolph County, AR, Alexander County, IL, Edwards County, IL, Franklin County, IL, Gallatin County, IL, Hamilton County, IL, Hardin County, IL, Jackson County, IL, Jefferson County, IL, Johnson County, IL, Massac County, IL, Perry County, IL, Pope County, IL, Pulaski County, IL, Saline County, IL, Union County, IL, Wabash County, IL, Wayne County, IL, White County, IL, Williamson County, IL, Ballard County, KY, Carlisle County, KY, Fulton County, KY, Hickman County, KY, McCracken County, KY, Bollinger County, MO, Butler County, MO, Cape Girardeau County, MO, Carter County, MO, Dunklin County, MO, Mississippi County, MO, New Madrid County, MO, Pemiscot County, MO, Perry County, MO, Ripley County, MO, Scott County, MO, Stoddard County, MO, Wayne County, MO, Dyer County, TN, Lake County, TN, Lauderdale County, TN, Obion County, TN
The radar
The Paducah radar (KPAH), 93 km from the middle of the area, began a volume at 17:43 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
- 40%
- 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
- 5%
- Six or more combined severe hail and wind reports
- 70%
Warnings issued inside it
21 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 31, 12:16 PM CST | Severe Thunderstorm Warning | MEG | Lawrence, Randolph | 59 min |
| Dec 31, 12:39 PM CST | Severe Thunderstorm Warning | PAH | Ripley | 51 min |
| Dec 31, 12:47 PM CST | Severe Thunderstorm Warning | PAH | Carter, Ripley | 28 min |
| Dec 31, 12:56 PM CST | Severe Thunderstorm Warning | MEG | Lawrence | 64 min |
| Dec 31, 1:09 PM CST | Severe Thunderstorm Warning | MEG | Lawrence, Randolph | 51 min |
| Dec 31, 1:39 PM CST | Severe Thunderstorm Warning | MEG | Clay, Greene, Lawrence, Randolph | 66 min |
| Dec 31, 1:42 PM CST | Severe Thunderstorm Warning | PAH | Butler, Carter, Ripley, Wayne | 33 min |
| Dec 31, 1:57 PM CST | Tornado Warning | PAH | Wayne | 33 min |
| Dec 31, 2:02 PM CST | Severe Thunderstorm Warning | MEG | Craighead, Poinsett | 41 min |
| Dec 31, 2:16 PM CST | Severe Thunderstorm Warning | PAH | Bollinger, Butler, Ripley, Stoddard, Wayne | 44 min |
| Dec 31, 2:21 PM CST | Tornado Warning | PAH | Bollinger, Butler, Stoddard, Wayne | 10 min |
| Dec 31, 2:29 PM CST | Tornado Warning | PAH | Butler, Stoddard, Wayne | 31 min |
| Dec 31, 2:34 PM CST | Severe Thunderstorm Warning | PAH | Bollinger, Wayne | 41 min |
| Dec 31, 2:38 PM CST | Severe Thunderstorm Warning | MEG | Clay, Greene | 52 min |
| Dec 31, 2:42 PM CST | Tornado Warning | PAH | Butler, Stoddard, Wayne | 33 min |
| Dec 31, 3:02 PM CST | Severe Thunderstorm Warning | PAH | Bollinger, Butler, Cape Girardeau, Stoddard | 28 min |
| Dec 31, 3:05 PM CST | Severe Thunderstorm Warning | MEG | Clay | 40 min |
| Dec 31, 4:26 PM CST | Severe Thunderstorm Warning | MEG | Clay | 49 min |
| Dec 31, 4:33 PM CST | Severe Thunderstorm Warning | PAH | New Madrid, Stoddard | 27 min |
| Dec 31, 4:59 PM CST | Severe Thunderstorm Warning | PAH | Fulton | 31 min |
| Dec 31, 5:12 PM CST | Severe Thunderstorm Warning | MEG | Crittenden, Cross, Poinsett, St. Francis | 48 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, 5.7 hours before the alert went out and 301 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
- 874 J/kg
- Mixed-layer CIN
- 0 J/kg
- Mixed-layer LCL
- 481 m above ground
- 0-6 km bulk shear
- 56 kt
- 0-1 km storm-relative helicity
- 322 m²/s²
- 0-3 km storm-relative helicity
- 360 m²/s²
- Significant tornado parameter
- 1.8
- Supercell composite
- 8.0
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 30, 8:52 PM CST | Mesoscale Discussion | SPC | Crawford, Franklin, Hempstead, Howard, Little River, Logan and 8 more | 113 min |
| Dec 31, 12:44 AM CST | Mesoscale Discussion | SPC | Benton, Boone, Carroll, Madison, Marion, Washington | 61 min |
| Dec 31, 1:03 AM CST | Tornado Watch | SPC | Benton, Carroll, Crawford, Madison, Washington | 7 hr |
| Dec 31, 3:27 AM CST | Mesoscale Discussion | SPC | Benton, Carroll | 2 hr |
| Dec 31, 4:56 AM CST | Mesoscale Discussion | SPC | Arkansas, Clay, Cleburne, Cleveland, Craighead, Cross and 25 more | 2 hr |
| Dec 31, 5:45 AM CST | Mesoscale Discussion | SPC | Baxter, Benton, Boone, Carroll, Cleburne, Conway and 25 more | 2 hr |
| Dec 31, 7:29 AM CST | Tornado Watch | SPC | Baxter, Benton, Boone, Carroll, Clark, Cleburne and 31 more | 8 hr |
| Dec 31, 10:36 AM CST | Mesoscale Discussion | SPC | Columbia, Hempstead, Lafayette, Miller, Nevada | 114 min |
| Dec 31, 11:04 AM CST | Mesoscale Discussion | SPC | Clay, Craighead, Greene | 56 min |
| Dec 31, 1:34 PM CST | Tornado Watch | SPC | Ashley, Chicot | 6 hr |
| Dec 31, 3:58 PM CST | Tornado Watch | SPC | Ashley, Chicot, Crittenden, Cross, Lee, Phillips and 1 more | 7 hr |
| Dec 31, 5:35 PM CST | Mesoscale Discussion | SPC | Arkansas, Crittenden, Desha, Lee, Mississippi, Phillips and 1 more | 115 min |
| Dec 31, 2:25 AM CST | Severe Thunderstorm Watch | SPC | Madison, Monroe, Saint Clair | 2 hr |
| Dec 31, 4:05 AM CST | Mesoscale Discussion | SPC | Bond, Calhoun, Greene, Jersey, Macoupin, Madison and 3 more | 115 min |
| Dec 31, 10:34 AM CST | Tornado Watch | SPC | Cass, Christian, DeWitt, Fulton, Logan, McLean and 13 more | 3 hr |
| Dec 31, 1:16 PM CST | Tornado Watch | SPC | Champaign, Christian, Clark, Clay, Coles, Crawford and 22 more | 6 hr |
| Dec 31, 2:12 PM CST | Mesoscale Discussion | SPC | Alexander, Champaign, Clark, Clay, Coles, Crawford and 30 more | 93 min |
| Dec 31, 3:56 AM CST | Mesoscale Discussion | SPC | Andrew, Buchanan, Caldwell, Clay, Clinton, Daviess and 3 more | 3 hr |
Nearby
Tornado Watches in Illinois, 2010Tornado Watches in Missouri, 2010Tornado Watches in Arkansas, 2010Every tornado watch in 2010
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.