Alert archive / Missouri / Tornado Watches in 2010
Tornado Watch 746
The Storm Prediction Center issued this tornado watch at Nov 22, 2010, 4:50 PM CST for 32 counties in Illinois; 40 counties in Missouri. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Nov 22, 2010, 4:50 PM CST (22:50 UTC)
- Expired
- Nov 22, 2010, 11:24 PM CST
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 60 kt
All 72 counties
Bond County, IL, Calhoun County, IL, Champaign County, IL, Christian County, IL, Clark County, IL, Clay County, IL, Clinton County, IL, Coles County, IL, Crawford County, IL, Cumberland County, IL, DeWitt County, IL, Douglas County, IL, Edgar County, IL, Effingham County, IL, Fayette County, IL, Jasper County, IL, Jersey County, IL, Lawrence County, IL, Macon County, IL, Macoupin County, IL, Madison County, IL, Marion County, IL, Monroe County, IL, Montgomery County, IL, Moultrie County, IL, Piatt County, IL, Randolph County, IL, Richland County, IL, Saint Clair County, IL, Shelby County, IL, Vermilion County, IL, Washington County, IL, Barry County, MO, Camden County, MO, Christian County, MO, City of Saint Louis, 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, Lincoln County, MO, Madison County, MO, Maries County, MO, McDonald County, MO, Miller County, MO, Montgomery County, MO, Oregon County, MO, Osage County, MO, Ozark County, MO, Phelps 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, Stone County, MO, Taney County, MO, Texas County, MO, Warren County, MO, Washington County, MO, Webster County, MO, Wright County, MO
The radar
The St Louis radar (KLSX), 30 km from the middle of the area, began a volume at 22:51 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
- 50%
- One or more hailstones of 2 inches or more
- 30%
- Six or more combined severe hail and wind reports
- 90%
Warnings issued inside it
17 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Nov 22, 4:54 PM CST | Tornado Warning | SGF | Greene, Webster | 34 min |
| Nov 22, 5:17 PM CST | Severe Thunderstorm Warning | LSX | Lincoln, Saint Charles, Warren | 43 min |
| Nov 22, 5:21 PM CST | Severe Thunderstorm Warning | ILX | Christian, Macon | 28 min |
| Nov 22, 5:37 PM CST | Severe Thunderstorm Warning | LSX | Calhoun, Greene, Jersey, Macoupin, Madison | 38 min |
| Nov 22, 6:11 PM CST | Severe Thunderstorm Warning | LSX | Macoupin, Madison | 34 min |
| Nov 22, 6:12 PM CST | Severe Thunderstorm Warning | LSX | Franklin, Gasconade, Saint Charles | 38 min |
| Nov 22, 6:21 PM CST | Severe Thunderstorm Warning | SGF | Webster | 24 min |
| Nov 22, 6:35 PM CST | Severe Thunderstorm Warning | SGF | Wright | 40 min |
| Nov 22, 6:36 PM CST | Severe Thunderstorm Warning | SGF | Barry | 54 min |
| Nov 22, 6:43 PM CST | Severe Thunderstorm Warning | LSX | Franklin, Jefferson, Saint Charles, Saint Louis | 36 min |
| Nov 22, 7:04 PM CST | Severe Thunderstorm Warning | SGF | Texas | 23 min |
| Nov 22, 7:10 PM CST | Severe Thunderstorm Warning | LSX | Madison, Saint Clair | 40 min |
| Nov 22, 7:14 PM CST | Severe Thunderstorm Warning | SGF | Christian, Stone, Taney | 29 min |
| Nov 22, 7:49 PM CST | Severe Thunderstorm Warning | LSX | Crawford, Franklin, Washington | 56 min |
| Nov 22, 7:59 PM CST | Severe Thunderstorm Warning | SGF | Douglas, Ozark | 61 min |
| Nov 22, 8:28 PM CST | Severe Thunderstorm Warning | SGF | Dent, Shannon, Texas | 27 min |
| Nov 22, 10:00 PM CST | Severe Thunderstorm Warning | LSX | Randolph | 22 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
Lincoln, IL (KILX), launched 12:00Z, 10.8 hours before the alert went out and 211 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
- 333 J/kg
- Mixed-layer CIN
- -45 J/kg
- Mixed-layer LCL
- 591 m above ground
- 0-6 km bulk shear
- 60 kt
- 0-1 km storm-relative helicity
- 309 m²/s²
- 0-3 km storm-relative helicity
- 310 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 3.0
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Nov 22, 10:50 AM CST | Mesoscale Discussion | SPC | Adams, Brown, Bureau, Fulton, Hancock, Henderson and 14 more | 85 min |
| Nov 22, 11:23 AM CST | Tornado Watch | SPC | Adams, Boone, Brown, Bureau, Carroll, Cass and 45 more | 7 hr |
| Nov 22, 2:10 PM CST | Mesoscale Discussion | SPC | Adams, Boone, Brown, Bureau, Carroll, Cass and 38 more | 95 min |
| Nov 22, 5:13 PM CST | Tornado Watch | SPC | Ford, Iroquois, Kankakee, Livingston | 4 hr |
| Nov 22, 3:19 PM CST | Mesoscale Discussion | SPC | Barry, Christian, Dade, Dallas, Douglas, Greene and 11 more | 86 min |
Nearby
Tornado Watches in Missouri, 2010Tornado Watches in Illinois, 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.