Alert archive / Missouri / Tornado Watches in 2010

Tornado Watch 45

April 4, 20104 states

The Storm Prediction Center issued this tornado watch at Apr 4, 2010, 3:34 PM CDT for 4 states. It was in force for 8 hr.

The area

The outline as issued.

The facts

Issued: Apr 4, 2010, 3:34 PM CDT (20:34 UTC)
Expired: Apr 4, 2010, 11:44 PM CDT
In force: 8 hr
Issued by: the Storm Prediction Center
Largest hail expected: 2.5 in
Strongest gust expected: 60 kt

All 94 counties

Appanoose County, IA, Cedar County, IA, Clinton County, IA, Davis County, IA, Des Moines County, IA, Henry County, IA, Jefferson County, IA, Lee County, IA, Louisa County, IA, Muscatine County, IA, Scott County, IA, Van Buren County, IA, Wapello County, IA, Washington County, IA, Wayne County, IA, Adams County, IL, Brown County, IL, Bureau County, IL, Calhoun County, IL, Carroll County, IL, Cass County, IL, Fulton County, IL, Greene County, IL, Hancock County, IL, Henderson County, IL, Henry County, IL, Knox County, IL, Marshall County, IL, Mason County, IL, McDonough County, IL, McLean County, IL, Menard County, IL, Mercer County, IL, Morgan County, IL, Peoria County, IL, Pike County, IL, Putnam County, IL, Rock Island County, IL, Schuyler County, IL, Scott County, IL, Stark County, IL, Tazewell County, IL, Warren County, IL, Whiteside County, IL, Woodford County, IL, Johnson County, KS, Leavenworth County, KS, Linn County, KS, Miami County, KS, Wyandotte County, KS, Adair County, MO, Audrain County, MO, Bates County, MO, Boone County, MO, Buchanan County, MO, Caldwell County, MO, Carroll County, MO, Cass County, MO, Chariton County, MO, Clark County, MO, Clay County, MO, Clinton County, MO, Cooper County, MO, Daviess County, MO, DeKalb County, MO, Gentry County, MO, Grundy County, MO, Harrison County, MO, Henry County, MO, Howard County, MO, Jackson County, MO, Johnson County, MO, Knox County, MO, Lafayette County, MO, Lewis County, MO, Linn County, MO, Livingston County, MO, Macon County, MO, Marion County, MO, Mercer County, MO, Moniteau County, MO, Monroe County, MO, Pettis County, MO, Pike County, MO, Platte County, MO, Putnam County, MO, Ralls County, MO, Randolph County, MO, Ray County, MO, Saline County, MO, Schuyler County, MO, Scotland County, MO, Shelby County, MO, Sullivan County, MO

The radar

The Quad Cities radar (KDVN), 162 km from the middle of the area, began a volume at 20:35 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: 70%
One or more gusts of 65 knots or more: 30%
Ten or more severe hail reports: 95%
One or more hailstones of 2 inches or more: 50%
Six or more combined severe hail and wind reports: 95%

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
Apr 4, 4:49 PM CDT	Severe Thunderstorm Warning	DMX	Wapello	26 min
Apr 4, 4:53 PM CDT	Severe Thunderstorm Warning	EAX	Caldwell, Clay, Clinton, Ray	37 min
Apr 4, 5:00 PM CDT	Severe Thunderstorm Warning	DVN	Lee, Van Buren	44 min
Apr 4, 5:05 PM CDT	Severe Thunderstorm Warning	DVN	Jefferson, Keokuk, Washington	40 min
Apr 4, 5:21 PM CDT	Severe Thunderstorm Warning	DVN	Clark, Scotland	37 min
Apr 4, 5:25 PM CDT	Severe Thunderstorm Warning	EAX	Caldwell, Carroll, Ray	35 min
Apr 4, 5:39 PM CDT	Severe Thunderstorm Warning	DVN	Hancock	56 min
Apr 4, 5:57 PM CDT	Severe Thunderstorm Warning	EAX	Carroll, Chariton, Saline	33 min
Apr 4, 6:06 PM CDT	Severe Thunderstorm Warning	DVN	Rock Island, Whiteside	54 min
Apr 4, 6:15 PM CDT	Severe Thunderstorm Warning	DVN	Henry, Mercer, Rock Island	39 min
Apr 4, 6:18 PM CDT	Severe Thunderstorm Warning	DVN	Hancock, McDonough	57 min
Apr 4, 6:30 PM CDT	Severe Thunderstorm Warning	EAX	Carroll, Chariton, Howard, Macon, Randolph, Saline	30 min
Apr 4, 6:54 PM CDT	Severe Thunderstorm Warning	ILX	Fulton, Knox, Peoria	51 min
Apr 4, 7:00 PM CDT	Severe Thunderstorm Warning	EAX	Chariton, Howard, Randolph	30 min
Apr 4, 7:03 PM CDT	Tornado Warning	EAX	Randolph	27 min
Apr 4, 7:16 PM CDT	Severe Thunderstorm Warning	ILX	Fulton, Mason, Tazewell	44 min
Apr 4, 7:16 PM CDT	Tornado Warning	LSX	Audrain, Boone, Monroe	44 min
Apr 4, 7:26 PM CDT	Tornado Warning	ILX	Fulton, Mason, Tazewell	34 min
Apr 4, 7:27 PM CDT	Severe Thunderstorm Warning	EAX	Randolph	15 min
Apr 4, 7:32 PM CDT	Severe Thunderstorm Warning	DVN	Johnson, Louisa, Muscatine	47 min
Apr 4, 7:44 PM CDT	Severe Thunderstorm Warning	ILX	Logan, Mason, Tazewell	46 min
Apr 4, 7:50 PM CDT	Severe Thunderstorm Warning	ILX	Logan, Mason, Menard	30 min
Apr 4, 7:52 PM CDT	Severe Thunderstorm Warning	DVN	Rock Island	44 min
Apr 4, 7:53 PM CDT	Severe Thunderstorm Warning	ILX	McLean, Tazewell, Woodford	67 min
Apr 4, 7:55 PM CDT	Tornado Warning	LSX	Audrain, Monroe, Ralls	35 min
Apr 4, 8:06 PM CDT	Severe Thunderstorm Warning	EAX	Howard, Randolph	24 min
Apr 4, 8:19 PM CDT	Tornado Warning	LSX	Lincoln, Pike	41 min
Apr 4, 8:23 PM CDT	Severe Thunderstorm Warning	LSX	Audrain, Boone	37 min
Apr 4, 8:34 PM CDT	Severe Thunderstorm Warning	LSX	Adams, Brown, Pike	26 min
Apr 4, 8:38 PM CDT	Severe Thunderstorm Warning	EAX	Cooper, Howard	20 min
Apr 4, 8:43 PM CDT	Severe Thunderstorm Warning	LSX	Audrain, Boone, Callaway	47 min
Apr 4, 8:45 PM CDT	Severe Thunderstorm Warning	ILX	DeWitt, McLean, Piatt	45 min
Apr 4, 8:55 PM CDT	Tornado Warning	LSX	Calhoun	35 min
Apr 4, 8:57 PM CDT	Tornado Warning	LSX	Audrain, Montgomery	33 min
Apr 4, 8:58 PM CDT	Severe Thunderstorm Warning	LSX	Pike	32 min
Apr 4, 9:03 PM CDT	Severe Thunderstorm Warning	ILX	Cass, Morgan, Sangamon, Scott	42 min
Apr 4, 9:05 PM CDT	Severe Thunderstorm Warning	EAX	Cooper	25 min
Apr 4, 9:22 PM CDT	Severe Thunderstorm Warning	LSX	Greene, Jersey	38 min
Apr 4, 9:29 PM CDT	Severe Thunderstorm Warning	LSX	Audrain, Boone, Callaway	46 min
Apr 4, 9:38 PM CDT	Tornado Warning	LSX	Greene, Jersey	26 min
Apr 4, 9:50 PM CDT	Severe Thunderstorm Warning	LSX	Greene, Pike	40 min
Apr 4, 9:56 PM CDT	Severe Thunderstorm Warning	LSX	Boone, Callaway	34 min
Apr 4, 10:16 PM CDT	Tornado Warning	LSX	Greene, Macoupin	29 min
Apr 4, 10:41 PM CDT	Severe Thunderstorm Warning	LSX	Calhoun	34 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

Davenport, (KDVN), launched 12:00Z, 8.6 hours before the alert went out and 167 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1716 m above ground
0-6 km bulk shear: 75 kt
0-1 km storm-relative helicity: 262 m²/s²
0-3 km storm-relative helicity: 301 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 4, 11:02 AM CDT	Mesoscale Discussion	SPC	Adams, Brown, Bureau, Calhoun, Cass, DeWitt and 31 more	88 min
Apr 4, 2:22 PM CDT	Mesoscale Discussion	SPC	Adams, Brown, Calhoun, Hancock, Pike, Schuyler and 1 more	113 min
Apr 4, 6:23 PM CDT	Mesoscale Discussion	SPC	Adams, Brown, Cass, Fulton, Hancock, Henderson and 12 more	67 min

Nearby

Tornado Watches in Missouri, 2010 Tornado Watches in Illinois, 2010 Tornado Watches in Iowa, 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.