Alert archive / Iowa / Tornado Watches in 2023

Tornado Watch 370

June 24, 202359 counties in Iowa

The Storm Prediction Center issued this tornado watch at Jun 24, 2023, 1:35 PM CDT for 59 counties in Iowa. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued: Jun 24, 2023, 1:35 PM CDT (18:35 UTC)
Expired: Jun 24, 2023, 7:00 PM CDT
In force: 5 hr
Issued by: the Storm Prediction Center
Largest hail expected: 2.5 in
Strongest gust expected: 60 kt

All 59 counties

Adair County, IA, Adams County, IA, Appanoose County, IA, Benton County, IA, Black Hawk County, IA, Boone County, IA, Bremer County, IA, Buchanan County, IA, Butler County, IA, Calhoun County, IA, Carroll County, IA, Cerro Gordo County, IA, Chickasaw County, IA, Clarke County, IA, Dallas County, IA, Davis County, IA, Decatur County, IA, Fayette County, IA, Floyd County, IA, Franklin County, IA, Greene County, IA, Grundy County, IA, Guthrie County, IA, Hamilton County, IA, Hancock County, IA, Hardin County, IA, Howard County, IA, Humboldt County, IA, Iowa County, IA, Jasper County, IA, Jefferson County, IA, Johnson County, IA, Keokuk County, IA, Kossuth County, IA, Linn County, IA, Lucas County, IA, Madison County, IA, Mahaska County, IA, Marion County, IA, Marshall County, IA, Mitchell County, IA, Monroe County, IA, Pocahontas County, IA, Polk County, IA, Poweshiek County, IA, Ringgold County, IA, Story County, IA, Tama County, IA, Union County, IA, Van Buren County, IA, Wapello County, IA, Warren County, IA, Washington County, IA, Wayne County, IA, Webster County, IA, Winnebago County, IA, Winneshiek County, IA, Worth County, IA, Wright County, IA

The radar

The Des Moines radar (KDMX), 98 km from the middle of the area, began a volume at 18:37 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: 40%
One or more gusts of 65 knots or more: 20%
Ten or more severe hail reports: 60%
One or more hailstones of 2 inches or more: 60%
Six or more combined severe hail and wind reports: 90%

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
Jun 24, 2:12 PM CDT	Severe Thunderstorm Warning	DMX	Calhoun, Greene, Webster	48 min
Jun 24, 2:26 PM CDT	Severe Thunderstorm Warning	DMX	Marion, Warren	34 min
Jun 24, 2:58 PM CDT	Severe Thunderstorm Warning	DMX	Marion	32 min
Jun 24, 3:46 PM CDT	Severe Thunderstorm Warning	DMX	Butler, Franklin	44 min
Jun 24, 4:16 PM CDT	Severe Thunderstorm Warning	DMX	Mahaska, Marion, Monroe	29 min
Jun 24, 4:21 PM CDT	Severe Thunderstorm Warning	DMX	Black Hawk, Bremer, Butler, Grundy	39 min
Jun 24, 4:55 PM CDT	Severe Thunderstorm Warning	DMX	Monroe, Wapello	35 min
Jun 24, 4:58 PM CDT	Severe Thunderstorm Warning	DMX	Black Hawk, Bremer	37 min
Jun 24, 5:16 PM CDT	Severe Thunderstorm Warning	ARX	Fayette	59 min
Jun 24, 5:20 PM CDT	Severe Thunderstorm Warning	DVN	Buchanan	40 min
Jun 24, 5:26 PM CDT	Severe Thunderstorm Warning	DMX	Wapello	25 min
Jun 24, 5:31 PM CDT	Severe Thunderstorm Warning Considerable damage threat	DMX	Davis, Wapello	29 min
Jun 24, 5:37 PM CDT	Severe Thunderstorm Warning	DVN	Jefferson, Van Buren	38 min
Jun 24, 5:44 PM CDT	Severe Thunderstorm Warning	DMX	Adair, Cass	46 min
Jun 24, 5:50 PM CDT	Severe Thunderstorm Warning Considerable damage threat	DMX	Davis, Wapello	25 min
Jun 24, 6:08 PM CDT	Severe Thunderstorm Warning Considerable damage threat	DVN	Van Buren	52 min
Jun 24, 6:43 PM CDT	Severe Thunderstorm Warning	DVN	Henry, Lee, Van Buren	47 min
Jun 24, 6:46 PM CDT	Severe Thunderstorm Warning	DMX	Adair, Madison, Union	23 min
Jun 24, 6:56 PM CDT	Severe Thunderstorm Warning	DMX	Black Hawk, Tama	20 min
Jun 24, 7:00 PM CDT	Severe Thunderstorm Warning	DVN	Benton, Buchanan, Linn	45 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, 6.6 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.

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: 2269 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 3 m²/s²
0-3 km storm-relative helicity: 23 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 24, 2:43 AM CDT	Mesoscale Discussion	SPC	Harrison, Mills, Monona, Plymouth, Pottawattamie, Woodbury	2 hr
Jun 24, 3:10 AM CDT	Severe Thunderstorm Watch	SPC	Cherokee, Clay, Crawford, Dickinson, Harrison, Ida and 11 more	4 hr
Jun 24, 4:37 AM CDT	Mesoscale Discussion	SPC	Cherokee, Lyon, O'Brien, Osceola, Plymouth, Sioux	83 min
Jun 24, 1:27 PM CDT	Mesoscale Discussion	SPC	Adair, Appanoose, Audubon, Benton, Black Hawk, Boone and 45 more	2 hr
Jun 24, 3:01 PM CDT	Mesoscale Discussion	SPC	Lyon, Sioux	119 min
Jun 24, 3:39 PM CDT	Mesoscale Discussion	SPC	Benton, Black Hawk, Bremer, Buchanan, Butler, Cerro Gordo and 19 more	2 hr
Jun 24, 5:45 PM CDT	Mesoscale Discussion	SPC	Cedar, Clayton, Clinton, Delaware, Des Moines, Dubuque and 12 more	90 min
Jun 24, 6:28 PM CDT	Severe Thunderstorm Watch	SPC	Cedar, Clayton, Clinton, Delaware, Des Moines, Dubuque and 12 more	8 hr

Nearby

Tornado Watches in Iowa, 2023 Every tornado watch in 2023

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.