Alert archive / Nebraska / Tornado Watches in 2013

Tornado Watch 247

May 29, 20134 states

The Storm Prediction Center issued this tornado watch at May 29, 2013, 6:24 PM CDT for 4 states. It was in force for 4 hr.

The area

The outline as issued.

The facts

Issued: May 29, 2013, 6:24 PM CDT (23:24 UTC)
Expired: May 29, 2013, 10:25 PM CDT
In force: 4 hr
Issued by: the Storm Prediction Center
Largest hail expected: 2 in
Strongest gust expected: 70 kt

All 86 counties

Adams County, IA, Audubon County, IA, Buena Vista County, IA, Carroll County, IA, Cass County, IA, Cherokee County, IA, Clay County, IA, Crawford County, IA, Dickinson County, IA, Fremont County, IA, Harrison County, IA, Ida County, IA, Lyon County, IA, Mills County, IA, Monona County, IA, Montgomery County, IA, O'Brien County, IA, Osceola County, IA, Page County, IA, Plymouth County, IA, Pottawattamie County, IA, Sac County, IA, Shelby County, IA, Sioux County, IA, Taylor County, IA, Woodbury County, IA, Cottonwood County, MN, Jackson County, MN, Lincoln County, MN, Lyon County, MN, Murray County, MN, Nobles County, MN, Pipestone County, MN, Rock County, MN, Antelope County, NE, Boone County, NE, Burt County, NE, Butler County, NE, Cass County, NE, Cedar County, NE, Colfax County, NE, Cuming County, NE, Dakota County, NE, Dixon County, NE, Dodge County, NE, Douglas County, NE, Gage County, NE, Jefferson County, NE, Johnson County, NE, Knox County, NE, Lancaster County, NE, Madison County, NE, Nemaha County, NE, Otoe County, NE, Pawnee County, NE, Pierce County, NE, Platte County, NE, Richardson County, NE, Saline County, NE, Sarpy County, NE, Saunders County, NE, Seward County, NE, Stanton County, NE, Thurston County, NE, Washington County, NE, Wayne County, NE, Beadle County, SD, Bon Homme County, SD, Brookings County, SD, Charles Mix County, SD, Clay County, SD, Davison County, SD, Douglas County, SD, Hanson County, SD, Hutchinson County, SD, Kingsbury County, SD, Lake County, SD, Lincoln County, SD, McCook County, SD, Miner County, SD, Minnehaha County, SD, Moody County, SD, Sanborn County, SD, Turner County, SD, Union County, SD, Yankton County, SD

The radar

The Sioux Falls radar (KFSD), 92 km from the middle of the area, began a volume at 23:26 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: 20%
Ten or more severe wind reports: 70%
One or more gusts of 65 knots or more: 30%
Ten or more severe hail reports: 30%
One or more hailstones of 2 inches or more: 30%
Six or more combined severe hail and wind reports: 70%

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
May 29, 6:45 PM CDT	Tornado Warning	OAX	Saunders	30 min
May 29, 6:52 PM CDT	Severe Thunderstorm Warning	OAX	Knox	23 min
May 29, 6:54 PM CDT	Severe Thunderstorm Warning	FSD	Bon Homme, Charles Mix	36 min
May 29, 7:01 PM CDT	Tornado Warning	OAX	Dodge	29 min
May 29, 7:02 PM CDT	Severe Thunderstorm Warning	OAX	Antelope, Boone, Madison, Pierce	28 min
May 29, 7:09 PM CDT	Flash Flood Warning	OAX	Lancaster	3 hr
May 29, 7:12 PM CDT	Flash Flood Warning	OAX	Lancaster, Saunders	3 hr
May 29, 7:22 PM CDT	Severe Thunderstorm Warning	OAX	Antelope, Cedar, Pierce, Wayne	23 min
May 29, 7:27 PM CDT	Severe Thunderstorm Warning	OAX	Madison, Pierce, Stanton, Wayne	33 min
May 29, 8:19 PM CDT	Flash Flood Warning	OAX	Fremont, Mills, Montgomery, Page, Pottawattamie	5 hr
May 29, 8:22 PM CDT	Severe Thunderstorm Warning	DMX	Crawford, Sac	53 min
May 29, 8:28 PM CDT	Severe Thunderstorm Warning	FSD	Ida, Woodbury	47 min
May 29, 8:58 PM CDT	Severe Thunderstorm Warning	FSD	Cherokee, Plymouth	32 min
May 29, 9:13 PM CDT	Flash Flood Warning	FSD	Plymouth	107 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, 11.4 hours before the alert went out and 168 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: 1537 J/kg
Mixed-layer CIN: -93 J/kg
Mixed-layer LCL: 544 m above ground
0-6 km bulk shear: 11 kt
0-1 km storm-relative helicity: 124 m²/s²
0-3 km storm-relative helicity: 137 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
May 28, 9:20 PM CDT	Mesoscale Discussion	SPC	Adams, Appanoose, Clarke, Davis, Decatur, Fremont and 10 more	55 min
May 29, 8:54 AM CDT	Mesoscale Discussion	SPC	Adair, Adams, Audubon, Boone, Buena Vista, Calhoun and 33 more	2 hr
May 29, 2:39 PM CDT	Mesoscale Discussion	SPC	Allamakee, Benton, Black Hawk, Bremer, Buchanan, Chickasaw and 19 more	66 min
May 29, 2:56 PM CDT	Severe Thunderstorm Watch	SPC	Allamakee, Appanoose, Benton, Black Hawk, Bremer, Buchanan and 29 more	7 hr
May 29, 3:33 PM CDT	Tornado Watch	SPC	Fremont, Mills	7 hr
May 29, 5:54 PM CDT	Mesoscale Discussion	SPC	Allamakee, Appanoose, Benton, Black Hawk, Bremer, Buchanan and 32 more	66 min
May 28, 7:52 PM CDT	Mesoscale Discussion	SPC	Arthur, Banner, Blaine, Box Butte, Boyd, Brown and 40 more	113 min
May 29, 12:57 AM CDT	Severe Thunderstorm Watch	SPC	Blaine, Custer, Hooker, Lincoln, Logan, Loup and 2 more	3 hr
May 29, 12:52 PM CDT	Mesoscale Discussion	SPC	Buffalo, Chase, Custer, Dawson, Dundy, Franklin and 14 more	53 min
May 29, 1:04 PM CDT	Tornado Watch	SPC	Adams, Arthur, Blaine, Buffalo, Chase, Clay and 38 more	9 hr
May 29, 3:12 PM CDT	Mesoscale Discussion	SPC	Butler, Cass, Fillmore, Gage, Hamilton, Jefferson and 12 more	2 hr
May 29, 3:24 PM CDT	Mesoscale Discussion	SPC	Adams, Arthur, Boone, Buffalo, Chase, Clay and 27 more	66 min
May 29, 5:18 PM CDT	Mesoscale Discussion	SPC	Burt, Cedar, Colfax, Cuming, Dakota, Dixon and 10 more	87 min

Nearby

Tornado Watches in Nebraska, 2013 Tornado Watches in Iowa, 2013 Tornado Watches in South Dakota, 2013 Every tornado watch in 2013

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.