Alert archive / Iowa / Severe Thunderstorm Watches in 2001

Severe Thunderstorm Watch 450

June 18, 20014 states

The Storm Prediction Center issued this severe thunderstorm watch at Jun 18, 2001, 8:45 PM CDT for 4 states. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued: Jun 18, 2001, 8:45 PM CDT (01:45 UTC)
Expired: Jun 19, 2001, 2:00 AM CDT
In force: 5 hr
Issued by: the Storm Prediction Center

All 65 counties

Adair County, IA, Adams County, IA, Allamakee County, IA, Audubon County, IA, Benton County, IA, Black Hawk County, IA, Boone County, IA, Bremer County, IA, Buchanan County, IA, Butler County, IA, Carroll County, IA, Cass County, IA, Cerro Gordo County, IA, Chickasaw County, IA, Clarke County, IA, Clayton County, IA, Dallas County, IA, Decatur County, IA, Fayette County, IA, Floyd County, IA, Franklin County, IA, Fremont County, IA, Greene County, IA, Grundy County, IA, Guthrie County, IA, Hamilton County, IA, Hancock County, IA, Hardin County, IA, Howard County, IA, Jasper County, IA, Lucas County, IA, Madison County, IA, Marion County, IA, Marshall County, IA, Mills County, IA, Mitchell County, IA, Montgomery County, IA, Page County, IA, Polk County, IA, Pottawattamie County, IA, Poweshiek County, IA, Ringgold County, IA, Shelby County, IA, Story County, IA, Tama County, IA, Taylor County, IA, Union County, IA, Warren County, IA, Webster County, IA, Winneshiek County, IA, Worth County, IA, Wright County, IA, Atchison County, MO, Gentry County, MO, Holt County, MO, Nodaway County, MO, Worth County, MO, Cass County, NE, Gage County, NE, Johnson County, NE, Nemaha County, NE, Otoe County, NE, Pawnee County, NE, Richardson County, NE, Crawford County, WI

The radar

The Des Moines radar (KDMX), 73 km from the middle of the area, began a volume at 01:48 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.

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
Jun 18, 8:51 PM CDT	Severe Thunderstorm Warning	OAX	Pottawattamie	39 min
Jun 18, 8:53 PM CDT	Severe Thunderstorm Warning	DMX	Audubon, Carroll, Crawford	42 min
Jun 18, 8:57 PM CDT	Severe Thunderstorm Warning	OAX	Pottawattamie	33 min
Jun 18, 8:59 PM CDT	Tornado Warning	DMX	Humboldt, Webster, Wright	31 min
Jun 18, 9:10 PM CDT	Severe Thunderstorm Warning	DMX	Worth	20 min
Jun 18, 9:15 PM CDT	Tornado Warning	DMX	Carroll	30 min
Jun 18, 9:20 PM CDT	Severe Thunderstorm Warning	ARX	Mitchell	55 min
Jun 18, 9:29 PM CDT	Severe Thunderstorm Warning	OAX	Mills, Pottawattamie	46 min
Jun 18, 9:43 PM CDT	Severe Thunderstorm Warning	ARX	Howard	47 min
Jun 18, 9:44 PM CDT	Severe Thunderstorm Warning	DMX	Hancock, Winnebago	31 min
Jun 18, 9:52 PM CDT	Severe Thunderstorm Warning	DMX	Hancock, Winnebago	23 min
Jun 18, 10:00 PM CDT	Severe Thunderstorm Warning	DMX	Cass	45 min
Jun 18, 10:04 PM CDT	Severe Thunderstorm Warning	DMX	Story	41 min
Jun 18, 10:07 PM CDT	Severe Thunderstorm Warning	DMX	Dallas, Guthrie	43 min
Jun 18, 10:10 PM CDT	Severe Thunderstorm Warning	DMX	Worth	30 min
Jun 18, 10:12 PM CDT	Severe Thunderstorm Warning	DMX	Grundy	28 min
Jun 18, 10:23 PM CDT	Severe Thunderstorm Warning	DMX	Marshall	42 min
Jun 18, 10:33 PM CDT	Severe Thunderstorm Warning	ARX	Mitchell	57 min
Jun 18, 10:34 PM CDT	Severe Thunderstorm Warning	OAX	Gage, Jefferson	41 min
Jun 18, 10:36 PM CDT	Severe Thunderstorm Warning	OAX	Shelby	24 min
Jun 18, 10:37 PM CDT	Severe Thunderstorm Warning	DMX	Worth	28 min
Jun 18, 10:44 PM CDT	Severe Thunderstorm Warning	ARX	Allamakee, Clayton, Fayette	61 min
Jun 18, 10:44 PM CDT	Severe Thunderstorm Warning	DMX	Jasper, Polk	46 min
Jun 18, 10:47 PM CDT	Severe Thunderstorm Warning	DMX	Tama	38 min
Jun 18, 10:49 PM CDT	Severe Thunderstorm Warning	DMX	Marion, Warren	46 min
Jun 18, 10:52 PM CDT	Severe Thunderstorm Warning	DMX	Black Hawk	23 min
Jun 18, 10:58 PM CDT	Severe Thunderstorm Warning	DMX	Clarke, Decatur, Ringgold	47 min
Jun 18, 11:00 PM CDT	Severe Thunderstorm Warning	DVN	Benton, Buchanan	45 min
Jun 18, 11:07 PM CDT	Severe Thunderstorm Warning	DMX	Audubon	28 min
Jun 18, 11:45 PM CDT	Severe Thunderstorm Warning	DMX	Decatur	40 min

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 1.8 hours before the alert went out and 156 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: 2637 J/kg
Mixed-layer CIN: -44 J/kg
Mixed-layer LCL: 2202 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 65 m²/s²
0-3 km storm-relative helicity: 346 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 16.5

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 18, 11:30 PM CDT	Severe Thunderstorm Watch	SPC	Appanoose, Benton, Cedar, Clinton, Davis, Delaware and 20 more	6 hr
Jun 18, 7:45 PM CDT	Tornado Watch	SPC	Buffalo, Chippewa, Clark, Dunn, Eau Claire, Jackson and 13 more	5 hr
Jun 18, 9:00 PM CDT	Tornado Watch	SPC	Ashland, Barron, Bayfield, Douglas, Forest, Iron and 6 more	5 hr

Nearby

Severe Thunderstorm Watches in Iowa, 2001 Severe Thunderstorm Watches in Nebraska, 2001 Severe Thunderstorm Watches in Missouri, 2001 Every severe thunderstorm watch in 2001

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.