Alert archive / Missouri / Tornado Watches in 2010

Tornado Watch 767

December 31, 201037 counties in Arkansas; 16 counties in Illinois; 52 counties in Missouri

The Storm Prediction Center issued this tornado watch at Dec 31, 2010, 7:29 AM CST for 37 counties in Arkansas; 16 counties in Illinois; 52 counties in Missouri. It was in force for 8 hr.

The area

The outline as issued.

The facts

Issued: Dec 31, 2010, 7:29 AM CST (13:29 UTC)
Expired: Dec 31, 2010, 3:00 PM CST
In force: 8 hr
Issued by: the Storm Prediction Center
Largest hail expected: 1 in
Strongest gust expected: 60 kt

All 105 counties

Baxter County, AR, Benton County, AR, Boone County, AR, Carroll County, AR, Clark County, AR, Cleburne County, AR, Conway County, AR, Crawford County, AR, Faulkner County, AR, Franklin County, AR, Fulton County, AR, Garland County, AR, Hot Spring County, AR, Independence County, AR, Izard County, AR, Jackson County, AR, Johnson County, AR, Logan County, AR, Madison County, AR, Marion County, AR, Montgomery County, AR, Newton County, AR, Perry County, AR, Pike County, AR, Polk County, AR, Pope County, AR, Pulaski County, AR, Saline County, AR, Scott County, AR, Searcy County, AR, Sebastian County, AR, Sharp County, AR, Stone County, AR, Van Buren County, AR, Washington County, AR, White County, AR, Yell County, AR, Bond County, IL, Brown County, IL, Calhoun County, IL, Clinton County, IL, Fayette County, IL, Greene County, IL, Jersey County, IL, Macoupin County, IL, Madison County, IL, Marion County, IL, Monroe County, IL, Montgomery County, IL, Pike County, IL, Randolph County, IL, Saint Clair County, IL, Washington County, IL, Audrain County, MO, Barry County, MO, Benton County, MO, Boone County, MO, Callaway County, MO, Camden County, MO, Cedar County, MO, Christian County, MO, City of Saint Louis, MO, Cole County, MO, Crawford County, MO, Dade County, MO, Dallas County, MO, Dent County, MO, Douglas County, MO, Franklin County, MO, Gasconade County, MO, Greene County, MO, Hickory County, MO, Howell County, MO, Iron County, MO, Jefferson County, MO, Laclede County, MO, Lawrence County, MO, Lincoln County, MO, Madison County, MO, Maries County, MO, Miller County, MO, Moniteau County, MO, Montgomery County, MO, Morgan County, MO, Oregon County, MO, Osage County, MO, Ozark County, MO, Phelps County, MO, Pike County, MO, Polk County, MO, Pulaski County, MO, Reynolds County, MO, Saint Charles County, MO, Saint Francois County, MO, Saint Louis County, MO, Sainte Genevieve County, MO, Shannon County, MO, St. Clair County, MO, Stone County, MO, Taney County, MO, Texas County, MO, Warren County, MO, Washington County, MO, Webster County, MO, Wright County, MO

The radar

The Springfield radar (KSGF), 108 km from the middle of the area, began a volume at 13:32 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: 20%
Ten or more severe hail reports: 10%
One or more hailstones of 2 inches or more: 5%
Six or more combined severe hail and wind reports: 70%

Warnings issued inside it

56 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

Issued	Product	Office	Counties	Lasted
Dec 31, 7:33 AM CST	Tornado Warning	SGF	Barry, Christian, Stone	27 min
Dec 31, 7:34 AM CST	Tornado Warning	SGF	Barry, Stone, Taney	41 min
Dec 31, 7:36 AM CST	Tornado Warning	SGF	Hickory, Polk	39 min
Dec 31, 7:39 AM CST	Severe Thunderstorm Warning	TSA	Crawford, Madison, Washington	36 min
Dec 31, 7:41 AM CST	Tornado Warning	TSA	Carroll	19 min
Dec 31, 7:52 AM CST	Severe Thunderstorm Warning	TSA	Crawford, Sebastian	38 min
Dec 31, 7:56 AM CST	Severe Thunderstorm Warning	SGF	Christian, Greene, Webster	34 min
Dec 31, 7:57 AM CST	Tornado Warning	SGF	Benton, Hickory	12 min
Dec 31, 7:59 AM CST	Tornado Warning	TSA	Crawford, Madison, Washington	31 min
Dec 31, 8:05 AM CST	Tornado Warning	SGF	Christian, Taney	40 min
Dec 31, 8:12 AM CST	Tornado Warning	SGF	Dade, Polk	33 min
Dec 31, 8:23 AM CST	Tornado Warning	TSA	Madison, Washington	15 min
Dec 31, 8:27 AM CST	Severe Thunderstorm Warning	SGF	Webster, Wright	33 min
Dec 31, 8:32 AM CST	Tornado Warning	SGF	Christian, Douglas	28 min
Dec 31, 8:36 AM CST	Severe Thunderstorm Warning	TSA	Franklin, Sebastian	39 min
Dec 31, 8:45 AM CST	Severe Thunderstorm Warning	TSA	Franklin	30 min
Dec 31, 8:59 AM CST	Severe Thunderstorm Warning	LZK	Johnson, Newton	46 min
Dec 31, 8:59 AM CST	Severe Thunderstorm Warning	SGF	Laclede, Pulaski, Wright	46 min
Dec 31, 9:00 AM CST	Severe Thunderstorm Warning	SGF	Wright	21 min
Dec 31, 9:06 AM CST	Tornado Warning	SGF	Laclede, Wright	23 min
Dec 31, 9:13 AM CST	Tornado Warning	SGF	Texas, Wright	47 min
Dec 31, 9:22 AM CST	Tornado Warning	SGF	Laclede, Phelps, Pulaski, Texas	53 min
Dec 31, 9:23 AM CST	Severe Thunderstorm Warning	LZK	Boone, Newton	52 min
Dec 31, 9:41 AM CST	Severe Thunderstorm Warning	LZK	Johnson, Newton, Pope, Searcy, Van Buren	49 min
Dec 31, 9:41 AM CST	Severe Thunderstorm Warning	LSX	Callaway	34 min
Dec 31, 9:43 AM CST	Tornado Warning	LSX	Adams, Brown	32 min
Dec 31, 9:54 AM CST	Tornado Warning	SGF	Dent, Phelps, Texas	51 min
Dec 31, 10:03 AM CST	Severe Thunderstorm Warning	LZK	Boone, Marion, Newton, Searcy	42 min
Dec 31, 10:08 AM CST	Tornado Warning	LSX	Audrain, Callaway, Montgomery, Pike	37 min
Dec 31, 10:11 AM CST	Tornado Warning	LSX	Crawford, Franklin, Gasconade	64 min
Dec 31, 10:13 AM CST	Tornado Warning	LSX	Crawford, Franklin, Washington	62 min
Dec 31, 10:22 AM CST	Tornado Warning	LSX	Pike	38 min
Dec 31, 10:30 AM CST	Severe Thunderstorm Warning	LZK	Baxter, Izard, Marion, Searcy, Stone, Van Buren	45 min
Dec 31, 10:31 AM CST	Severe Thunderstorm Warning	SGF	Dent	44 min
Dec 31, 10:38 AM CST	Severe Thunderstorm Warning	SGF	Dent, Howell, Shannon, Texas	67 min
Dec 31, 10:47 AM CST	Tornado Warning	LSX	Montgomery, Pike	13 min
Dec 31, 10:52 AM CST	Tornado Warning	LZK	Baxter, Izard, Searcy, Stone	11 min
Dec 31, 10:56 AM CST	Tornado Warning	LSX	Crawford, Franklin, Jefferson, Saint Charles, Saint Louis, Warren and 1 more	64 min
Dec 31, 11:00 AM CST	Tornado Warning	LSX	Calhoun, Pike	60 min
Dec 31, 11:11 AM CST	Severe Thunderstorm Warning	LZK	Baxter, Fulton, Izard, Stone	49 min
Dec 31, 11:15 AM CST	Tornado Warning	LSX	Calhoun, Pike	45 min
Dec 31, 11:22 AM CST	Tornado Warning	LSX	Calhoun, Jersey, Madison, Monroe, Saint Clair	53 min
Dec 31, 11:54 AM CST	Tornado Warning	LSX	Calhoun, Greene, Pike	51 min
Dec 31, 11:58 AM CST	Severe Thunderstorm Warning	LZK	Fulton, Izard, Sharp	47 min
Dec 31, 11:59 AM CST	Tornado Warning	LSX	Bond, Clinton, Jersey, Macoupin, Madison, Monroe and 2 more	61 min
Dec 31, 12:27 PM CST	Severe Thunderstorm Warning	SGF	Oregon	33 min
Dec 31, 12:29 PM CST	Tornado Warning	LSX	Jefferson, Sainte Genevieve, Saint Francois	31 min
Dec 31, 12:32 PM CST	Severe Thunderstorm Warning	LZK	Cleburne, Independence, Jackson, Sharp, White	58 min
Dec 31, 12:38 PM CST	Tornado Warning	LSX	Bond, Clinton, Fayette, Marion, Montgomery	67 min
Dec 31, 12:57 PM CST	Tornado Warning	LSX	Bond, Clinton, Madison, Monroe, Randolph, Saint Clair and 1 more	48 min
Dec 31, 1:11 PM CST	Tornado Warning	LSX	Randolph	49 min
Dec 31, 1:39 PM CST	Severe Thunderstorm Warning	LZK	Grant, Saline	27 min
Dec 31, 1:40 PM CST	Tornado Warning	LSX	Bond, Clinton, Fayette, Marion, Washington	50 min
Dec 31, 1:44 PM CST	Tornado Warning	LSX	Clinton, Monroe, Randolph, Saint Clair, Washington	61 min
Dec 31, 2:00 PM CST	Tornado Warning	LSX	Randolph	60 min
Dec 31, 2:22 PM CST	Tornado Warning	LSX	Bond, Clinton, Fayette, Marion, Washington	53 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 12:00Z, 1.5 hours before the alert went out and 157 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 764 J/kg
Mixed-layer CIN: -39 J/kg
Mixed-layer LCL: 569 m above ground
0-6 km bulk shear: 69 kt
0-1 km storm-relative helicity: 535 m²/s²
0-3 km storm-relative helicity: 546 m²/s²
Significant tornado parameter: 2.9
Supercell composite: 10.7

Open this sounding in Storm Lab

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, 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, 11:42 AM CST	Tornado Watch	SPC	Clay, Craighead, Greene, Lawrence, Mississippi, Poinsett and 1 more	7 hr
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 Missouri, 2010 Tornado Watches in Arkansas, 2010 Tornado Watches in Illinois, 2010 Every 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.