Alert archive / Nebraska / Severe Thunderstorm Watches in 2012

Severe Thunderstorm Watch 304

May 27, 20124 states

The Storm Prediction Center issued this severe thunderstorm watch at May 27, 2012, 3:42 PM CDT for 4 states. It was in force for 8 hr.

The area

The outline as issued.

The facts

Issued: May 27, 2012, 3:42 PM CDT (20:42 UTC)
Expired: May 28, 2012, 12:00 AM CDT
In force: 8 hr
Issued by: the Storm Prediction Center
Largest hail expected: 2 in
Strongest gust expected: 70 kt

All 87 counties

Buena Vista County, IA, Cherokee County, IA, Clay County, IA, Crawford County, IA, Dickinson County, IA, Emmet County, IA, Harrison County, IA, Ida County, IA, Lyon County, IA, Monona County, IA, O'Brien County, IA, Osceola County, IA, Palo Alto County, IA, Plymouth County, IA, Sac County, IA, Shelby County, IA, Sioux County, IA, Woodbury County, IA, Brown County, MN, Cottonwood County, MN, Jackson County, MN, Lincoln County, MN, Lyon County, MN, Martin County, MN, Murray County, MN, Nobles County, MN, Pipestone County, MN, Redwood County, MN, Rock County, MN, Watonwan County, MN, Adams County, NE, Antelope County, NE, Boone County, NE, Buffalo County, NE, Burt County, NE, Butler County, NE, Cedar County, NE, Clay County, NE, Colfax County, NE, Cuming County, NE, Dakota County, NE, Dixon County, NE, Dodge County, NE, Douglas County, NE, Fillmore County, NE, Franklin County, NE, Furnas County, NE, Gosper County, NE, Greeley County, NE, Hall County, NE, Hamilton County, NE, Harlan County, NE, Howard County, NE, Kearney County, NE, Knox County, NE, Lancaster County, NE, Madison County, NE, Merrick County, NE, Nance County, NE, Nuckolls County, NE, Phelps County, NE, Pierce County, NE, Platte County, NE, Polk County, NE, Saline County, NE, Sarpy County, NE, Saunders County, NE, Seward County, NE, Stanton County, NE, Thayer County, NE, Thurston County, NE, Washington County, NE, Wayne County, NE, Webster County, NE, York County, NE, Bon Homme County, SD, Brookings County, SD, Clay County, SD, Hutchinson County, SD, Lake County, SD, Lincoln County, SD, McCook County, SD, Minnehaha County, SD, Moody County, SD, Turner County, SD, Union County, SD, Yankton County, SD

The radar

The Sioux Falls radar (KFSD), 97 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: 5%
Ten or more severe wind reports: 70%
One or more gusts of 65 knots or more: 50%
Ten or more severe hail reports: 30%
One or more hailstones of 2 inches or more: 40%
Six or more combined severe hail and wind reports: 90%

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
May 27, 4:22 PM CDT	Severe Thunderstorm Warning	GID	Greeley	23 min
May 27, 4:39 PM CDT	Severe Thunderstorm Warning	OAX	Cuming, Stanton, Thurston, Wayne	47 min
May 27, 4:41 PM CDT	Severe Thunderstorm Warning	OAX	Antelope, Boone	34 min
May 27, 4:47 PM CDT	Severe Thunderstorm Warning	GID	Greeley, Howard, Sherman, Valley	43 min
May 27, 5:00 PM CDT	Severe Thunderstorm Warning	GID	Buffalo, Hall, Howard, Sherman	30 min
May 27, 5:06 PM CDT	Severe Thunderstorm Warning	GID	Thayer	24 min
May 27, 5:10 PM CDT	Severe Thunderstorm Warning	GID	Greeley, Howard	50 min
May 27, 5:13 PM CDT	Tornado Warning	OAX	Antelope, Pierce	29 min
May 27, 5:16 PM CDT	Severe Thunderstorm Warning	OAX	Cedar	44 min
May 27, 5:24 PM CDT	Severe Thunderstorm Warning	OAX	Cedar, Knox, Madison, Pierce, Wayne	51 min
May 27, 5:27 PM CDT	Severe Thunderstorm Warning	FSD	Plymouth, Sioux	33 min
May 27, 5:27 PM CDT	Severe Thunderstorm Warning	GID	Howard, Sherman	18 min
May 27, 5:27 PM CDT	Tornado Warning	GID	Greeley	33 min
May 27, 5:30 PM CDT	Severe Thunderstorm Warning	GID	Fillmore, Thayer	45 min
May 27, 5:30 PM CDT	Tornado Warning	OAX	Antelope, Pierce	30 min
May 27, 5:36 PM CDT	Tornado Warning	OAX	Boone	39 min
May 27, 5:43 PM CDT	Severe Thunderstorm Warning	OAX	Saline, Seward	47 min
May 27, 5:46 PM CDT	Severe Thunderstorm Warning	GID	Fillmore, Nuckolls, Thayer	29 min
May 27, 5:47 PM CDT	Flash Flood Warning	OAX	Antelope, Boone, Pierce	3 hr
May 27, 5:55 PM CDT	Severe Thunderstorm Warning	GID	Greeley, Howard, Merrick, Nance	50 min
May 27, 5:57 PM CDT	Severe Thunderstorm Warning	OAX	Jefferson, Saline, Seward	48 min
May 27, 5:58 PM CDT	Severe Thunderstorm Warning	FSD	Lyon, Sioux	32 min
May 27, 6:00 PM CDT	Tornado Warning	OAX	Boone, Madison, Platte	30 min
May 27, 6:04 PM CDT	Severe Thunderstorm Warning	OAX	Antelope, Boone, Madison, Pierce	26 min
May 27, 6:06 PM CDT	Severe Thunderstorm Warning	OAX	Cedar, Pierce, Wayne	39 min
May 27, 6:11 PM CDT	Severe Thunderstorm Warning	FSD	Lyon	34 min
May 27, 6:11 PM CDT	Severe Thunderstorm Warning	GID	Buffalo, Hall, Howard, Sherman	34 min
May 27, 6:14 PM CDT	Severe Thunderstorm Warning	GID	Fillmore, York	31 min
May 27, 6:19 PM CDT	Severe Thunderstorm Warning	OAX	Butler, Seward	26 min
May 27, 6:19 PM CDT	Severe Thunderstorm Warning	OAX	Boone, Platte	26 min
May 27, 6:24 PM CDT	Severe Thunderstorm Warning	FSD	Lyon	36 min
May 27, 6:27 PM CDT	Severe Thunderstorm Warning	GID	Franklin, Webster	33 min
May 27, 6:28 PM CDT	Tornado Warning	OAX	Madison, Pierce, Stanton	32 min
May 27, 6:31 PM CDT	Severe Thunderstorm Warning	FSD	Dixon	44 min
May 27, 6:32 PM CDT	Severe Thunderstorm Warning	OAX	Madison, Pierce	28 min
May 27, 6:35 PM CDT	Severe Thunderstorm Warning	FSD	Lyon	40 min
May 27, 6:38 PM CDT	Severe Thunderstorm Warning	FSD	Jackson, Murray, Nobles	37 min
May 27, 6:42 PM CDT	Severe Thunderstorm Warning	OAX	Antelope, Boone, Madison, Platte	33 min
May 27, 6:45 PM CDT	Severe Thunderstorm Warning	GID	Greeley, Howard	45 min
May 27, 6:45 PM CDT	Severe Thunderstorm Warning	GID	Fillmore, York	15 min
May 27, 6:46 PM CDT	Severe Thunderstorm Warning	OAX	Butler, Colfax, Dodge, Saunders	33 min
May 27, 6:48 PM CDT	Severe Thunderstorm Warning	OAX	Butler, Lancaster, Saline, Saunders, Seward	57 min
May 27, 6:50 PM CDT	Severe Thunderstorm Warning	GID	Adams, Franklin, Kearney, Webster	40 min
May 27, 6:53 PM CDT	Severe Thunderstorm Warning	OAX	Cedar, Pierce, Stanton, Thurston, Wayne	37 min
May 27, 6:54 PM CDT	Severe Thunderstorm Warning	GID	Adams, Kearney	36 min
May 27, 7:00 PM CDT	Severe Thunderstorm Warning	GID	Buffalo, Hall, Howard	30 min
May 27, 7:05 PM CDT	Severe Thunderstorm Warning	OAX	Butler, Lancaster, Saunders, Seward	40 min
May 27, 7:11 PM CDT	Severe Thunderstorm Warning	FSD	Plymouth, Sioux	34 min
May 27, 7:22 PM CDT	Flash Flood Warning	FSD	Lyon, Plymouth, Sioux	7 hr
May 27, 7:27 PM CDT	Severe Thunderstorm Warning	GID	Adams, Franklin, Kearney, Webster	48 min
May 27, 7:30 PM CDT	Severe Thunderstorm Warning	MPX	Blue Earth, Brown, Nicollet, Sibley, Watonwan	60 min
May 27, 7:31 PM CDT	Severe Thunderstorm Warning	FSD	Lyon, Plymouth, Sioux	29 min
May 27, 7:33 PM CDT	Severe Thunderstorm Warning	GID	Franklin	21 min
May 27, 7:33 PM CDT	Severe Thunderstorm Warning	GID	Hall, Hamilton, Howard, Merrick, Nance	42 min
May 27, 7:36 PM CDT	Severe Thunderstorm Warning	GID	Buffalo, Hall, Kearney	24 min
May 27, 7:54 PM CDT	Severe Thunderstorm Warning	FSD	Lyon, O'Brien, Osceola, Sioux	36 min
May 27, 7:57 PM CDT	Severe Thunderstorm Warning	GID	Franklin, Harlan, Kearney, Phelps	18 min
May 27, 8:13 PM CDT	Severe Thunderstorm Warning	GID	Merrick, Nance	32 min
May 27, 8:19 PM CDT	Flash Flood Warning	FSD	Lyon, Osceola	7 hr
May 27, 8:22 PM CDT	Severe Thunderstorm Warning	OAX	Madison, Platte, Stanton	23 min
May 27, 8:23 PM CDT	Severe Thunderstorm Warning	GID	Adams, Franklin, Kearney, Webster	37 min
May 27, 8:26 PM CDT	Flash Flood Warning	OAX	Cedar, Madison, Pierce, Stanton, Wayne	4 hr
May 27, 8:31 PM CDT	Severe Thunderstorm Warning	GID	Hamilton, Merrick, Polk, York	29 min
May 27, 8:34 PM CDT	Flash Flood Warning	OAX	Boone, Madison, Platte, Stanton	4 hr
May 27, 8:38 PM CDT	Tornado Warning	OAX	Cuming, Stanton, Wayne	22 min
May 27, 8:45 PM CDT	Severe Thunderstorm Warning	GID	Greeley, Howard	30 min
May 27, 8:49 PM CDT	Severe Thunderstorm Warning	OAX	Colfax, Platte, Stanton	29 min
May 27, 8:50 PM CDT	Severe Thunderstorm Warning	GID	Adams, Franklin, Harlan, Kearney, Webster	40 min
May 27, 8:54 PM CDT	Severe Thunderstorm Warning	FSD	Dickinson	36 min
May 27, 8:57 PM CDT	Severe Thunderstorm Warning	GID	Harlan	33 min
May 27, 8:59 PM CDT	Severe Thunderstorm Warning	OAX	Cedar, Wayne	16 min
May 27, 9:10 PM CDT	Severe Thunderstorm Warning	GID	Adams, Franklin, Kearney, Webster	35 min
May 27, 9:12 PM CDT	Severe Thunderstorm Warning	GID	Hamilton, Merrick, Polk, York	33 min
May 27, 9:18 PM CDT	Severe Thunderstorm Warning	FSD	Plymouth	27 min
May 27, 9:21 PM CDT	Flash Flood Warning	OAX	Platte	4 hr
May 27, 9:27 PM CDT	Flash Flood Warning	MPX	Blue Earth, Brown, Hennepin, McLeod, Meeker, Nicollet and 4 more	6 hr
May 27, 9:29 PM CDT	Severe Thunderstorm Warning	OAX	Butler, Colfax, Platte	12 min
May 27, 9:30 PM CDT	Severe Thunderstorm Warning	GID	Adams, Clay, Nuckolls, Webster	30 min
May 27, 9:32 PM CDT	Flash Flood Warning	FSD	Dixon	4 hr
May 27, 9:42 PM CDT	Severe Thunderstorm Warning	FSD	Plymouth, Woodbury	10 min
May 27, 9:52 PM CDT	Severe Thunderstorm Warning	GID	Adams, Clay, Fillmore, Franklin, Hamilton, Kearney and 3 more	38 min
May 27, 10:15 PM CDT	Severe Thunderstorm Warning	GID	Fillmore, Polk, York	45 min
May 27, 10:19 PM CDT	Severe Thunderstorm Warning	GID	Fillmore, Thayer	26 min
May 27, 10:29 PM CDT	Severe Thunderstorm Warning	GID	Franklin, Kearney	31 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 158 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: 1034 J/kg
Mixed-layer CIN: -295 J/kg
Mixed-layer LCL: 1208 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 222 m²/s²
0-3 km storm-relative helicity: 245 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 27, 2:58 PM CDT	Mesoscale Discussion	SPC	Buena Vista, Cherokee, Clay, Crawford, Dickinson, Emmet and 13 more	62 min
May 27, 6:55 PM CDT	Mesoscale Discussion	SPC	Cherokee, Clay, Dickinson, Emmet, Ida, Lyon and 6 more	2 hr
May 26, 7:56 PM CDT	Mesoscale Discussion	SPC	Aitkin, Carlton, Crow Wing, Itasca, Pine	2 hr
May 26, 11:57 PM CDT	Mesoscale Discussion	SPC	Becker, Benton, Clay, Crow Wing, Douglas, Grant and 12 more	93 min
May 27, 3:49 PM CDT	Mesoscale Discussion	SPC	Anoka, Benton, Chisago, Crow Wing, Douglas, Grant and 19 more	56 min
May 27, 6:08 PM CDT	Severe Thunderstorm Watch	SPC	Aitkin, Anoka, Benton, Blue Earth, Brown, Carver and 40 more	7 hr
May 26, 9:07 PM CDT	Mesoscale Discussion	SPC	Cherry, Keya Paha	53 min

Nearby

Severe Thunderstorm Watches in Nebraska, 2012 Severe Thunderstorm Watches in Iowa, 2012 Severe Thunderstorm Watches in Minnesota, 2012 Every severe thunderstorm watch in 2012

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.