Alert archive / Nebraska / Severe Thunderstorm Watches in 2017

Severe Thunderstorm Watch 381

June 29, 201724 counties in Iowa; 44 counties in Nebraska; 9 counties in South Dakota

The Storm Prediction Center issued this severe thunderstorm watch at Jun 29, 2017, 3:42 PM CDT for 24 counties in Iowa; 44 counties in Nebraska; 9 counties in South Dakota. It was in force for 8 hr.

The area

The outline as issued.

The facts

Issued: Jun 29, 2017, 3:42 PM CDT (20:42 UTC)
Expired: Jun 30, 2017, 12:00 AM CDT
In force: 8 hr
Issued by: the Storm Prediction Center
Largest hail expected: 2.5 in
Strongest gust expected: 60 kt

All 77 counties

Audubon County, IA, Buena Vista County, IA, Calhoun County, IA, Carroll County, IA, Cass County, IA, Cherokee County, IA, Clay County, IA, Crawford County, IA, Fremont County, IA, Greene County, IA, Guthrie County, IA, Harrison County, IA, Ida County, IA, Mills County, IA, Monona County, IA, Montgomery County, IA, O'Brien County, IA, Plymouth County, IA, Pocahontas County, IA, Pottawattamie County, IA, Sac County, IA, Shelby County, IA, Sioux County, IA, Woodbury County, IA, Antelope County, NE, Boone County, NE, Boyd County, NE, Buffalo County, NE, Burt County, NE, Butler County, NE, Cass County, NE, Cedar County, NE, Colfax County, NE, Cuming County, NE, Custer County, NE, Dakota County, NE, Dawson County, NE, Dixon County, NE, Dodge County, NE, Douglas County, NE, Garfield County, NE, Gosper County, NE, Greeley County, NE, Hall County, NE, Hamilton County, NE, Holt County, NE, Howard County, NE, Knox County, NE, Lancaster County, NE, Madison County, NE, Merrick County, NE, Nance County, NE, Otoe County, NE, Phelps County, NE, Pierce County, NE, Platte County, NE, Polk County, NE, Sarpy County, NE, Saunders County, NE, Seward County, NE, Sherman County, NE, Stanton County, NE, Thurston County, NE, Valley County, NE, Washington County, NE, Wayne County, NE, Wheeler County, NE, York County, NE, Bon Homme County, SD, Charles Mix County, SD, Clay County, SD, Douglas County, SD, Hutchinson County, SD, Lincoln County, SD, Turner County, SD, Union County, SD, Yankton County, SD

The radar

The Omaha radar (KOAX), 142 km from the middle of the area, began a volume at 20:42 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: 20%
One or more EF2 to EF5 tornadoes: 10%
Ten or more severe wind reports: 40%
One or more gusts of 65 knots or more: 10%
Ten or more severe hail reports: 50%
One or more hailstones of 2 inches or more: 50%
Six or more combined severe hail and wind reports: 90%

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
Jun 29, 3:47 PM CDT	Severe Thunderstorm Warning	FSD	Aurora, Douglas	28 min
Jun 29, 3:48 PM CDT	Severe Thunderstorm Warning	FSD	Plymouth, Woodbury	42 min
Jun 29, 3:49 PM CDT	Severe Thunderstorm Warning	LBF	Holt	41 min
Jun 29, 3:57 PM CDT	Severe Thunderstorm Warning	FSD	Charles Mix, Douglas	33 min
Jun 29, 3:59 PM CDT	Severe Thunderstorm Warning	LBF	Holt, Wheeler	46 min
Jun 29, 4:06 PM CDT	Severe Thunderstorm Warning	OAX	Cedar, Pierce, Wayne	39 min
Jun 29, 4:06 PM CDT	Severe Thunderstorm Warning	FSD	Charles Mix, Douglas	24 min
Jun 29, 4:08 PM CDT	Severe Thunderstorm Warning	FSD	Plymouth	52 min
Jun 29, 4:15 PM CDT	Severe Thunderstorm Warning	FSD	Bon Homme, Charles Mix, Douglas, Hutchinson	30 min
Jun 29, 4:16 PM CDT	Severe Thunderstorm Warning	FSD	Bon Homme, Charles Mix	29 min
Jun 29, 4:23 PM CDT	Tornado Warning	FSD	Woodbury	37 min
Jun 29, 4:26 PM CDT	Severe Thunderstorm Warning	FSD	Woodbury	49 min
Jun 29, 4:30 PM CDT	Severe Thunderstorm Warning	OAX	Antelope, Madison, Pierce	30 min
Jun 29, 4:40 PM CDT	Severe Thunderstorm Warning	FSD	Bon Homme, Charles Mix, Douglas, Hutchinson	35 min
Jun 29, 4:46 PM CDT	Tornado Warning	FSD	Woodbury	29 min
Jun 29, 4:46 PM CDT	Severe Thunderstorm Warning	OAX	Cuming, Pierce, Stanton, Wayne	29 min
Jun 29, 4:47 PM CDT	Flash Flood Warning	FSD	Plymouth, Woodbury	3 hr
Jun 29, 4:54 PM CDT	Severe Thunderstorm Warning	FSD	Sioux	51 min
Jun 29, 4:56 PM CDT	Severe Thunderstorm Warning	LBF	Holt, Wheeler	29 min
Jun 29, 4:57 PM CDT	Severe Thunderstorm Warning	OAX	Madison, Pierce, Stanton, Wayne	18 min
Jun 29, 5:01 PM CDT	Severe Thunderstorm Warning	FSD	Bon Homme, Hutchinson, Yankton	29 min
Jun 29, 5:10 PM CDT	Severe Thunderstorm Warning	FSD	Woodbury	35 min
Jun 29, 5:10 PM CDT	Severe Thunderstorm Warning	OAX	Thurston, Wayne	35 min
Jun 29, 5:15 PM CDT	Severe Thunderstorm Warning	OAX	Cedar, Knox	30 min
Jun 29, 5:23 PM CDT	Severe Thunderstorm Warning	FSD	Bon Homme, Hutchinson, Turner, Yankton	37 min
Jun 29, 5:29 PM CDT	Severe Thunderstorm Warning	FSD	Clay	33 min
Jun 29, 5:30 PM CDT	Tornado Warning	FSD	Woodbury	30 min
Jun 29, 5:33 PM CDT	Tornado Warning	OAX	Monona	27 min
Jun 29, 5:39 PM CDT	Severe Thunderstorm Warning	FSD	Dixon	36 min
Jun 29, 5:39 PM CDT	Severe Thunderstorm Warning	OAX	Burt, Cuming, Thurston, Wayne	21 min
Jun 29, 5:40 PM CDT	Severe Thunderstorm Warning	OAX	Cedar, Knox	35 min
Jun 29, 5:43 PM CDT	Severe Thunderstorm Warning	FSD	Lyon, Sioux	18 min
Jun 29, 5:48 PM CDT	Tornado Warning Tornado observed	OAX	Cedar	27 min
Jun 29, 5:57 PM CDT	Tornado Warning	OAX	Monona	33 min
Jun 29, 5:59 PM CDT	Severe Thunderstorm Warning	FSD	Ida, Woodbury	22 min
Jun 29, 6:03 PM CDT	Severe Thunderstorm Warning	FSD	Dixon	27 min
Jun 29, 6:11 PM CDT	Tornado Warning Tornado observed	OAX	Cedar	18 min
Jun 29, 6:12 PM CDT	Tornado Warning	FSD	Dixon	18 min
Jun 29, 6:15 PM CDT	Severe Thunderstorm Warning	DMX	Crawford	45 min
Jun 29, 6:16 PM CDT	Severe Thunderstorm Warning	OAX	Harrison, Monona	29 min
Jun 29, 6:19 PM CDT	Severe Thunderstorm Warning	OAX	Cuming, Madison, Stanton	26 min
Jun 29, 6:27 PM CDT	Severe Thunderstorm Warning	FSD	Plymouth, Sioux	33 min
Jun 29, 6:39 PM CDT	Severe Thunderstorm Warning	OAX	Burt, Cuming, Thurston	36 min
Jun 29, 6:45 PM CDT	Severe Thunderstorm Warning	OAX	Harrison, Monona	30 min
Jun 29, 6:49 PM CDT	Severe Thunderstorm Warning	OAX	Madison, Stanton	26 min
Jun 29, 7:05 PM CDT	Severe Thunderstorm Warning	DMX	Carroll, Crawford	40 min
Jun 29, 7:11 PM CDT	Severe Thunderstorm Warning	OAX	Colfax, Cuming, Dodge, Stanton	34 min
Jun 29, 7:13 PM CDT	Severe Thunderstorm Warning	OAX	Harrison, Monona, Shelby	32 min
Jun 29, 7:23 PM CDT	Severe Thunderstorm Warning	OAX	Harrison, Pottawattamie	37 min
Jun 29, 7:31 PM CDT	Severe Thunderstorm Warning	DMX	Carroll	44 min
Jun 29, 7:39 PM CDT	Severe Thunderstorm Warning	OAX	Burt, Colfax, Cuming, Dodge, Stanton	36 min
Jun 29, 7:56 PM CDT	Severe Thunderstorm Warning	OAX	Harrison, Pottawattamie, Shelby	34 min
Jun 29, 8:04 PM CDT	Severe Thunderstorm Warning	OAX	Colfax, Dodge	26 min
Jun 29, 8:06 PM CDT	Severe Thunderstorm Warning	OAX	Burt, Colfax, Cuming, Dodge, Washington	24 min
Jun 29, 8:24 PM CDT	Severe Thunderstorm Warning	OAX	Harrison	36 min
Jun 29, 9:13 PM CDT	Severe Thunderstorm Warning	OAX	Dodge, Douglas, Saunders	32 min
Jun 29, 9:16 PM CDT	Severe Thunderstorm Warning	OAX	Harrison, Pottawattamie	29 min
Jun 29, 9:32 PM CDT	Severe Thunderstorm Warning	OAX	Mills, Pottawattamie	28 min
Jun 29, 9:42 PM CDT	Severe Thunderstorm Warning	OAX	Douglas, Sarpy, Saunders	33 min
Jun 29, 9:45 PM CDT	Severe Thunderstorm Warning	OAX	Harrison, Pottawattamie, Shelby	30 min
Jun 29, 9:46 PM CDT	Severe Thunderstorm Warning	OAX	Harrison, Pottawattamie, Shelby	29 min
Jun 29, 9:55 PM CDT	Severe Thunderstorm Warning	OAX	Mills, Pottawattamie	35 min
Jun 29, 10:26 PM CDT	Severe Thunderstorm Warning	OAX	Mills, Pottawattamie	34 min
Jun 29, 10:39 PM CDT	Severe Thunderstorm Warning	OAX	Montgomery, Pottawattamie	36 min
Jun 29, 10:42 PM CDT	Severe Thunderstorm Warning	OAX	Fremont, Mills	33 min
Jun 29, 10:52 PM CDT	Severe Thunderstorm Warning	OAX	Lancaster, Seward	38 min
Jun 29, 10:58 PM CDT	Severe Thunderstorm Warning	OAX	Fremont, Mills	32 min
Jun 29, 11:26 PM CDT	Severe Thunderstorm Warning	OAX	Fremont, Mills, Montgomery, Page	34 min
Jun 29, 11:29 PM CDT	Severe Thunderstorm Warning	OAX	Lancaster, Otoe	31 min
Jun 30, 12:00 AM CDT	Severe Thunderstorm Warning	OAX	Mills, Pottawattamie	17 min
Jun 30, 12:00 AM CDT	Severe Thunderstorm Warning	OAX	Johnson, Lancaster, Otoe	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

Omaha, NE (KOAX), launched 12:00Z, 8.7 hours before the alert went out and 142 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: 712 J/kg
Mixed-layer CIN: -119 J/kg
Mixed-layer LCL: 1324 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: -19 m²/s²
0-3 km storm-relative helicity: 9 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -0.1

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 28, 7:53 PM CDT	Mesoscale Discussion	SPC	Clinton, Dubuque, Jackson, Jones, Linn	97 min
Jun 28, 8:39 PM CDT	Mesoscale Discussion	SPC	Decatur, Ringgold, Taylor	96 min
Jun 29, 2:26 PM CDT	Mesoscale Discussion	SPC	Plymouth	94 min
Jun 29, 3:48 PM CDT	Mesoscale Discussion	SPC	Black Hawk, Bremer, Buchanan, Butler, Clayton, Delaware and 7 more	117 min
Jun 29, 6:08 PM CDT	Mesoscale Discussion	SPC	Audubon, Buena Vista, Carroll, Cass, Cherokee, Clay and 13 more	67 min
Jun 29, 12:47 AM CDT	Mesoscale Discussion	SPC	Franklin, Furnas, Harlan, Nuckolls, Webster	58 min
Jun 29, 1:22 AM CDT	Severe Thunderstorm Watch	SPC	Franklin, Harlan, Nuckolls, Thayer, Webster	8 hr

Nearby

Severe Thunderstorm Watches in Nebraska, 2017 Severe Thunderstorm Watches in Iowa, 2017 Severe Thunderstorm Watches in South Dakota, 2017 Every severe thunderstorm watch in 2017

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.