Alert archive / Iowa / Tornado Watches in 2024

Tornado Watch 116

April 16, 202434 counties in Iowa; 31 counties in Missouri

The Storm Prediction Center issued this tornado watch at Apr 16, 2024, 10:22 AM CDT for 34 counties in Iowa; 31 counties in Missouri. It was in force for 8 hr.

The area

The outline as issued.

The facts

Issued: Apr 16, 2024, 10:22 AM CDT (15:22 UTC)
Expired: Apr 16, 2024, 6:00 PM CDT
In force: 8 hr
Issued by: the Storm Prediction Center
Largest hail expected: 2 in
Strongest gust expected: 60 kt

All 65 counties

Adair County, IA, Adams County, IA, Appanoose County, IA, Black Hawk County, IA, Boone County, IA, Bremer County, IA, Butler County, IA, Cerro Gordo County, IA, Clarke County, IA, Dallas County, IA, Davis County, IA, Decatur County, IA, Franklin County, IA, Grundy County, IA, Hamilton County, IA, Hardin County, IA, Jasper County, IA, Lucas County, IA, Madison County, IA, Mahaska County, IA, Marion County, IA, Marshall County, IA, Monroe County, IA, Polk County, IA, Poweshiek County, IA, Ringgold County, IA, Story County, IA, Tama County, IA, Taylor County, IA, Union County, IA, Wapello County, IA, Warren County, IA, Wayne County, IA, Wright County, IA, Adair County, MO, Andrew County, MO, Caldwell County, MO, Carroll County, MO, Cass County, MO, Chariton 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, Howard County, MO, Jackson County, MO, Johnson County, MO, Lafayette County, MO, Linn County, MO, Livingston County, MO, Macon County, MO, Mercer County, MO, Nodaway County, MO, Pettis County, MO, Putnam County, MO, Randolph County, MO, Ray County, MO, Saline County, MO, Schuyler County, MO, Sullivan County, MO, Worth County, MO

The radar

The Des Moines radar (KDMX), 164 km from the middle of the area, began a volume at 15:25 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: 50%
One or more EF2 to EF5 tornadoes: 30%
Ten or more severe wind reports: 50%
One or more gusts of 65 knots or more: 20%
Ten or more severe hail reports: 40%
One or more hailstones of 2 inches or more: 30%
Six or more combined severe hail and wind reports: 90%

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
Apr 16, 10:31 AM CDT	Severe Thunderstorm Warning	EAX	Caldwell, Clay, Clinton, Daviess, DeKalb, Jackson and 1 more	29 min
Apr 16, 10:59 AM CDT	Severe Thunderstorm Warning	EAX	Caldwell, Carroll, Clinton, Daviess, DeKalb, Grundy and 3 more	46 min
Apr 16, 11:09 AM CDT	Tornado Warning	DMX	Boone, Dallas	36 min
Apr 16, 11:31 AM CDT	Severe Thunderstorm Warning	EAX	Adair, Macon, Schuyler	44 min
Apr 16, 11:33 AM CDT	Severe Thunderstorm Warning Considerable damage threat	EAX	Adair, Putnam, Schuyler, Sullivan	27 min
Apr 16, 11:37 AM CDT	Severe Thunderstorm Warning Considerable damage threat	EAX	Adair, Macon	23 min
Apr 16, 11:41 AM CDT	Severe Thunderstorm Warning	DMX	Boone, Franklin, Hamilton, Hardin, Humboldt, Marshall and 4 more	64 min
Apr 16, 11:44 AM CDT	Severe Thunderstorm Warning	EAX	Daviess, Grundy, Harrison, Mercer, Sullivan	31 min
Apr 16, 11:53 AM CDT	Severe Thunderstorm Warning	DMX	Appanoose, Davis, Wapello	37 min
Apr 16, 12:03 PM CDT	Severe Thunderstorm Warning	EAX	Mercer, Putnam	27 min
Apr 16, 12:18 PM CDT	Severe Thunderstorm Warning	DMX	Lucas, Wayne	45 min
Apr 16, 12:41 PM CDT	Severe Thunderstorm Warning	EAX	Grundy, Mercer, Putnam, Sullivan	34 min
Apr 16, 12:43 PM CDT	Severe Thunderstorm Warning	EAX	Jackson, Lafayette, Ray	32 min
Apr 16, 12:56 PM CDT	Severe Thunderstorm Warning	EAX	Bates, Cass, Johnson	34 min
Apr 16, 1:02 PM CDT	Severe Thunderstorm Warning	DMX	Jasper, Lucas, Mahaska, Marion, Monroe, Wayne	46 min
Apr 16, 1:09 PM CDT	Severe Thunderstorm Warning	EAX	Putnam, Sullivan	39 min
Apr 16, 1:15 PM CDT	Severe Thunderstorm Warning	EAX	Caldwell, Carroll, Jackson, Johnson, Lafayette, Livingston and 1 more	45 min
Apr 16, 1:35 PM CDT	Severe Thunderstorm Warning	DMX	Jasper, Mahaska, Marion, Poweshiek	40 min
Apr 16, 1:38 PM CDT	Severe Thunderstorm Warning	DMX	Appanoose, Monroe, Wapello, Wayne	23 min
Apr 16, 1:46 PM CDT	Severe Thunderstorm Warning	EAX	Carroll, Chariton, Grundy, Lafayette, Linn, Livingston and 3 more	29 min
Apr 16, 1:58 PM CDT	Severe Thunderstorm Warning	DMX	Davis, Mahaska, Monroe, Poweshiek, Wapello	47 min
Apr 16, 2:05 PM CDT	Severe Thunderstorm Warning	DMX	Black Hawk, Bremer, Butler, Grundy	40 min
Apr 16, 2:09 PM CDT	Severe Thunderstorm Warning	EAX	Adair, Carroll, Chariton, Linn, Livingston, Putnam and 1 more	36 min
Apr 16, 2:25 PM CDT	Severe Thunderstorm Warning	DMX	Appanoose, Davis	35 min
Apr 16, 2:31 PM CDT	Severe Thunderstorm Warning	EAX	Adair, Chariton, Linn, Macon, Putnam, Schuyler and 1 more	44 min
Apr 16, 2:54 PM CDT	Severe Thunderstorm Warning	DMX	Davis, Wapello	51 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, 3.4 hours before the alert went out and 276 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: 1439 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 392 m²/s²
0-3 km storm-relative helicity: 424 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.4

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 16, 2:14 AM CDT	Tornado Watch	SPC	Fremont, Harrison, Mills, Pottawattamie	6 hr
Apr 16, 6:00 AM CDT	Mesoscale Discussion	SPC	Fremont, Harrison, Mills, Montgomery, Page, Pottawattamie	2 hr
Apr 16, 8:50 AM CDT	Mesoscale Discussion	SPC	Adair, Adams, Appanoose, Audubon, Boone, Cass and 37 more	55 min
Apr 16, 11:04 AM CDT	Mesoscale Discussion	SPC	Henry, Jefferson, Lee, Van Buren	2 hr
Apr 16, 11:43 AM CDT	Mesoscale Discussion	SPC	Audubon, Buena Vista, Calhoun, Carroll, Cherokee, Clay and 13 more	92 min
Apr 16, 12:06 PM CDT	Tornado Watch	SPC	Benton, Buchanan, Cedar, Chickasaw, Clayton, Clinton and 19 more	10 hr
Apr 16, 12:23 PM CDT	Tornado Watch	SPC	Audubon, Buena Vista, Calhoun, Carroll, Cass, Cherokee and 25 more	7 hr
Apr 16, 1:56 PM CDT	Mesoscale Discussion	SPC	Appanoose, Benton, Black Hawk, Bremer, Buchanan, Butler and 34 more	64 min
Apr 16, 2:03 PM CDT	Mesoscale Discussion	SPC	Audubon, Buena Vista, Calhoun, Carroll, Cherokee, Clay and 16 more	87 min
Apr 16, 3:36 PM CDT	Mesoscale Discussion	SPC	Boone, Buena Vista, Calhoun, Carroll, Cherokee, Clay and 24 more	54 min
Apr 16, 4:47 PM CDT	Mesoscale Discussion	SPC	Cedar, Clinton, Des Moines, Henry, Jackson, Johnson and 6 more	88 min
Apr 16, 6:12 PM CDT	Mesoscale Discussion	SPC	Benton, Black Hawk, Bremer, Butler, Cerro Gordo, Chickasaw and 16 more	63 min
Apr 15, 9:07 PM CDT	Mesoscale Discussion	SPC	Atchison, Holt	2 hr
Apr 16, 3:16 PM CDT	Mesoscale Discussion	SPC	Dunklin	89 min
Apr 16, 3:21 PM CDT	Severe Thunderstorm Watch	SPC	Crawford, Franklin, Iron, Jefferson, Lincoln, Madison and 8 more	5 hr
Apr 16, 6:23 PM CDT	Mesoscale Discussion	SPC	Audrain, Boone, Callaway, Cole, Lincoln, Marion and 6 more	2 hr

Nearby

Tornado Watches in Iowa, 2024 Tornado Watches in Missouri, 2024 Every tornado watch in 2024

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.