Alert archive / Iowa / Severe Thunderstorm Watches in 2001

Severe Thunderstorm Watch 214

May 9, 200146 counties in Iowa; 16 counties in Nebraska

The Storm Prediction Center issued this severe thunderstorm watch at May 9, 2001, 4:30 PM CDT for 46 counties in Iowa; 16 counties in Nebraska. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued: May 9, 2001, 4:30 PM CDT (21:30 UTC)
Expired: May 9, 2001, 10:00 PM CDT
In force: 6 hr
Issued by: the Storm Prediction Center

All 62 counties

Adair County, IA, Adams County, IA, Audubon County, IA, Boone County, IA, Buena Vista County, IA, Butler County, IA, Calhoun County, IA, Carroll County, IA, Cass County, IA, Cerro Gordo County, IA, Cherokee County, IA, Chickasaw County, IA, Clay County, IA, Crawford County, IA, Dallas County, IA, Emmet County, IA, Floyd County, IA, Franklin County, IA, Fremont County, IA, Greene County, IA, Guthrie County, IA, Hamilton County, IA, Hancock County, IA, Hardin County, IA, Harrison County, IA, Howard County, IA, Humboldt County, IA, Ida County, IA, Kossuth County, IA, Mills County, IA, Mitchell County, IA, Monona County, IA, Montgomery County, IA, Page County, IA, Palo Alto County, IA, Pocahontas County, IA, Pottawattamie County, IA, Sac County, IA, Shelby County, IA, Story County, IA, Webster County, IA, Winnebago County, IA, Winneshiek County, IA, Woodbury County, IA, Worth County, IA, Wright County, IA, Burt County, NE, Butler County, NE, Cass County, NE, Colfax County, NE, Cuming County, NE, Dodge County, NE, Douglas County, NE, Hamilton County, NE, Lancaster County, NE, Otoe County, NE, Polk County, NE, Sarpy County, NE, Saunders County, NE, Seward County, NE, Washington County, NE, York County, NE

The radar

The Omaha radar (KOAX), 78 km from the middle of the area, began a volume at 21:32 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

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

Issued	Product	Office	Counties	Lasted
May 9, 5:22 PM CDT	Severe Thunderstorm Warning	FSD	Cherokee	23 min
May 9, 6:11 PM CDT	Severe Thunderstorm Warning	OAX	Cuming	49 min
May 9, 6:23 PM CDT	Severe Thunderstorm Warning	FSD	Buena Vista	37 min
May 9, 6:25 PM CDT	Severe Thunderstorm Warning	OAX	Monona	65 min
May 9, 6:31 PM CDT	Severe Thunderstorm Warning	FSD	Woodbury	29 min
May 9, 6:45 PM CDT	Severe Thunderstorm Warning	OAX	Colfax, Stanton	45 min
May 9, 6:48 PM CDT	Severe Thunderstorm Warning	FSD	Ida	27 min
May 9, 6:58 PM CDT	Severe Thunderstorm Warning	OAX	Cuming, Dodge	62 min
May 9, 7:06 PM CDT	Severe Thunderstorm Warning	DMX	Sac	29 min
May 9, 7:10 PM CDT	Severe Thunderstorm Warning	OAX	Harrison	50 min
May 9, 7:12 PM CDT	Tornado Warning	OAX	Cuming, Dodge	48 min
May 9, 7:25 PM CDT	Severe Thunderstorm Warning	FSD	Buena Vista	20 min
May 9, 7:27 PM CDT	Tornado Warning	OAX	Colfax, Platte	33 min
May 9, 7:28 PM CDT	Tornado Warning	OAX	Colfax	62 min
May 9, 7:31 PM CDT	Severe Thunderstorm Warning	DMX	Palo Alto, Pocahontas	39 min
May 9, 7:33 PM CDT	Severe Thunderstorm Warning	OAX	Monona	42 min
May 9, 7:40 PM CDT	Severe Thunderstorm Warning	OAX	Burt, Washington	65 min
May 9, 7:52 PM CDT	Severe Thunderstorm Warning	OAX	Dodge	53 min
May 9, 7:56 PM CDT	Severe Thunderstorm Warning	OAX	Harrison	64 min
May 9, 8:05 PM CDT	Severe Thunderstorm Warning	OAX	Butler, Saunders	55 min
May 9, 8:12 PM CDT	Severe Thunderstorm Warning	DMX	Pocahontas	18 min
May 9, 8:24 PM CDT	Tornado Warning	OAX	Dodge	36 min
May 9, 8:30 PM CDT	Severe Thunderstorm Warning	OAX	Colfax	30 min
May 9, 8:32 PM CDT	Severe Thunderstorm Warning	DMX	Audubon	38 min
May 9, 8:39 PM CDT	Severe Thunderstorm Warning	GID	Polk	51 min
May 9, 8:45 PM CDT	Severe Thunderstorm Warning	OAX	Washington	45 min
May 9, 8:57 PM CDT	Severe Thunderstorm Warning	DMX	Guthrie	28 min
May 9, 8:57 PM CDT	Severe Thunderstorm Warning	OAX	Douglas	63 min
May 9, 9:00 PM CDT	Severe Thunderstorm Warning	OAX	Shelby	45 min
May 9, 9:11 PM CDT	Severe Thunderstorm Warning	GID	Hamilton, Merrick	49 min
May 9, 9:14 PM CDT	Severe Thunderstorm Warning	DMX	Hamilton	31 min
May 9, 9:17 PM CDT	Severe Thunderstorm Warning	OAX	Pottawattamie	58 min
May 9, 9:23 PM CDT	Severe Thunderstorm Warning	OAX	Dodge	52 min
May 9, 9:26 PM CDT	Severe Thunderstorm Warning	OAX	Washington	34 min
May 9, 9:29 PM CDT	Severe Thunderstorm Warning	GID	Polk, York	46 min
May 9, 9:32 PM CDT	Severe Thunderstorm Warning	OAX	Colfax	43 min
May 9, 9:51 PM CDT	Severe Thunderstorm Warning	OAX	Mills	54 min

The nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 9.5 hours before the alert went out and 79 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: 23 J/kg
Mixed-layer CIN: -338 J/kg
Mixed-layer LCL: 1809 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 106 m²/s²
0-3 km storm-relative helicity: 132 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

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
May 9, 5:15 PM CDT	Severe Thunderstorm Watch	SPC	Adams, Buffalo, Dawson, Franklin, Frontier, Furnas and 8 more	4 hr

Nearby

Severe Thunderstorm Watches in Iowa, 2001 Severe Thunderstorm Watches in Nebraska, 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.