Alert archive / Iowa / Severe Thunderstorm Watches in 1997

Severe Thunderstorm Watch 261

May 7, 19974 states

The Storm Prediction Center issued this severe thunderstorm watch at May 7, 1997, 2:00 PM CDT for 4 states. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued: May 7, 1997, 2:00 PM CDT (19:00 UTC)
Expired: May 7, 1997, 7:00 PM CDT
In force: 5 hr
Issued by: the Storm Prediction Center

All 81 counties

Adair County, IA, Adams County, IA, Audubon County, IA, Boone County, IA, Carroll County, IA, Cass County, IA, Clarke County, IA, Crawford County, IA, Dallas County, IA, Decatur County, IA, Fremont County, IA, Greene County, IA, Guthrie County, IA, Harrison County, IA, Madison County, IA, Marshall County, IA, Mills County, IA, Monona County, IA, Montgomery County, IA, Page County, IA, Polk County, IA, Pottawattamie County, IA, Ringgold County, IA, Shelby County, IA, Story County, IA, Taylor County, IA, Union County, IA, Warren County, IA, Atchison County, KS, Brown County, KS, Clay County, KS, Cloud County, KS, Dickinson County, KS, Doniphan County, KS, Douglas County, KS, Ellsworth County, KS, Geary County, KS, Jackson County, KS, Jefferson County, KS, Leavenworth County, KS, Lincoln County, KS, Marshall County, KS, Mitchell County, KS, Morris County, KS, Nemaha County, KS, Osage County, KS, Ottawa County, KS, Pottawatomie County, KS, Republic County, KS, Riley County, KS, Saline County, KS, Shawnee County, KS, Wabaunsee County, KS, Washington County, KS, Andrew County, MO, Atchison County, MO, Buchanan County, MO, DeKalb County, MO, Gentry County, MO, Holt County, MO, Nodaway County, MO, Platte County, MO, Worth County, MO, Burt County, NE, Cass County, NE, Dodge County, NE, Douglas County, NE, Gage County, NE, Jefferson County, NE, Johnson County, NE, Lancaster County, NE, Nemaha County, NE, Otoe County, NE, Pawnee County, NE, Richardson County, NE, Saline County, NE, Sarpy County, NE, Saunders County, NE, Seward County, NE, Thayer County, NE, Washington County, NE

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
May 7, 3:01 PM CDT	Severe Thunderstorm Warning	OAX	Pottawattamie	64 min
May 7, 3:18 PM CDT	Severe Thunderstorm Warning	DMX	Crawford	32 min
May 7, 3:36 PM CDT	Severe Thunderstorm Warning	OAX	Shelby	64 min
May 7, 3:48 PM CDT	Severe Thunderstorm Warning	DMX	Crawford	17 min
May 7, 3:58 PM CDT	Severe Thunderstorm Warning	OAX	Sarpy	47 min
May 7, 4:04 PM CDT	Severe Thunderstorm Warning	DMX	Carroll	31 min
May 7, 4:04 PM CDT	Severe Thunderstorm Warning	OAX	Gage, Pawnee	61 min
May 7, 4:06 PM CDT	Severe Thunderstorm Warning	OAX	Nemaha	49 min
May 7, 4:09 PM CDT	Severe Thunderstorm Warning	TOP	Cloud, Republic	46 min
May 7, 4:09 PM CDT	Severe Thunderstorm Warning	OAX	Lancaster	66 min
May 7, 4:11 PM CDT	Severe Thunderstorm Warning	EAX	Atchison	49 min
May 7, 4:13 PM CDT	Tornado Warning	OAX	Lancaster	47 min
May 7, 4:16 PM CDT	Severe Thunderstorm Warning	OAX	Mills, Pottawattamie	64 min
May 7, 4:20 PM CDT	Severe Thunderstorm Warning	TOP	Ottawa	50 min
May 7, 4:21 PM CDT	Tornado Warning	OAX	Gage	39 min
May 7, 4:29 PM CDT	Severe Thunderstorm Warning	DMX	Audubon	31 min
May 7, 4:29 PM CDT	Severe Thunderstorm Warning	OAX	Richardson	61 min
May 7, 4:37 PM CDT	Severe Thunderstorm Warning	TOP	Clay, Riley	48 min
May 7, 4:40 PM CDT	Tornado Warning	OAX	Johnson, Otoe	65 min
May 7, 4:47 PM CDT	Severe Thunderstorm Warning	DMX	Adams	33 min
May 7, 4:49 PM CDT	Tornado Warning	OAX	Mills	66 min
May 7, 4:58 PM CDT	Tornado Warning	TOP	Ottawa	32 min
May 7, 4:59 PM CDT	Severe Thunderstorm Warning	DMX	Audubon	36 min
May 7, 5:01 PM CDT	Severe Thunderstorm Warning	EAX	Atchison	44 min
May 7, 5:10 PM CDT	Severe Thunderstorm Warning	TOP	Nemaha	45 min
May 7, 5:17 PM CDT	Severe Thunderstorm Warning	EAX	Holt	58 min
May 7, 5:19 PM CDT	Severe Thunderstorm Warning	TOP	Marshall	31 min
May 7, 5:26 PM CDT	Tornado Warning	TOP	Dickinson	44 min
May 7, 5:31 PM CDT	Severe Thunderstorm Warning	TOP	Ottawa	34 min
May 7, 5:41 PM CDT	Severe Thunderstorm Warning	DMX	Marion, Warren	34 min
May 7, 5:47 PM CDT	Severe Thunderstorm Warning	TOP	Brown	48 min
May 7, 5:50 PM CDT	Severe Thunderstorm Warning	ICT	McPherson, Saline	60 min
May 7, 5:52 PM CDT	Severe Thunderstorm Warning	DMX	Dallas, Guthrie	33 min
May 7, 5:58 PM CDT	Severe Thunderstorm Warning	OAX	Montgomery, Page	62 min
May 7, 6:07 PM CDT	Tornado Warning	TOP	Dickinson	48 min
May 7, 6:19 PM CDT	Severe Thunderstorm Warning	EAX	Doniphan	41 min
May 7, 6:43 PM CDT	Severe Thunderstorm Warning	TOP	Morris	47 min
May 7, 6:52 PM CDT	Severe Thunderstorm Warning	ICT	McPherson, Saline	63 min

The nearest sounding before it

Topeka, KS (KTOP), launched 12:00Z, 7.0 hours before the alert went out and 133 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: 463 J/kg
Mixed-layer CIN: -188 J/kg
Mixed-layer LCL: 833 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 310 m²/s²
0-3 km storm-relative helicity: 415 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 5.6

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 7, 6:15 PM CDT	Severe Thunderstorm Watch	SPC	Appanoose, Clarke, Davis, Decatur, Des Moines, Henry and 22 more	6 hr
May 7, 4:30 PM CDT	Tornado Watch	SPC	Barber, Butler, Chase, Comanche, Harper, Harvey and 11 more	6 hr
May 7, 6:45 PM CDT	Tornado Watch	SPC	Allen, Anderson, Bourbon, Chautauqua, Cherokee, Coffey and 14 more	6 hr

Nearby

Severe Thunderstorm Watches in Iowa, 1997 Severe Thunderstorm Watches in Kansas, 1997 Severe Thunderstorm Watches in Nebraska, 1997 Every severe thunderstorm watch in 1997

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.