Alert archive / Nebraska / Severe Thunderstorm Watches in 2014

Severe Thunderstorm Watch 339

June 20, 20144 states

The Storm Prediction Center issued this severe thunderstorm watch at Jun 20, 2014, 8:51 PM CDT for 4 states. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued: Jun 20, 2014, 8:51 PM CDT (01:51 UTC)
Expired: Jun 21, 2014, 3:00 AM CDT
In force: 6 hr
Issued by: the Storm Prediction Center
Largest hail expected: 2 in
Strongest gust expected: 60 kt

All 74 counties

Adair County, IA, Adams County, IA, Cass County, IA, Fremont County, IA, Mills County, IA, Montgomery County, IA, Page County, IA, Ringgold County, IA, Taylor County, IA, Union County, IA, Brown County, KS, Doniphan County, KS, Jewell County, KS, Marshall County, KS, Nemaha County, KS, Phillips County, KS, Republic County, KS, Smith County, KS, Washington County, KS, Andrew County, MO, Atchison County, MO, DeKalb County, MO, Gentry County, MO, Harrison County, MO, Holt County, MO, Nodaway County, MO, Worth County, MO, Adams County, NE, Antelope County, NE, Boone County, NE, Buffalo County, NE, Butler County, NE, Cass County, NE, Clay County, NE, Colfax County, NE, Dawson County, NE, Dodge County, NE, Douglas County, NE, Fillmore County, NE, Franklin County, NE, Furnas County, NE, Gage County, NE, Gosper County, NE, Greeley County, NE, Hall County, NE, Hamilton County, NE, Harlan County, NE, Howard County, NE, Jefferson County, NE, Johnson County, NE, Kearney County, NE, Lancaster County, NE, Madison County, NE, Merrick County, NE, Nance County, NE, Nemaha County, NE, Nuckolls County, NE, Otoe County, NE, Pawnee County, NE, Phelps County, NE, Pierce County, NE, Platte County, NE, Polk County, NE, Richardson County, NE, Saline County, NE, Sarpy County, NE, Saunders County, NE, Seward County, NE, Sherman County, NE, Stanton County, NE, Thayer County, NE, Valley County, NE, Webster County, NE, York County, NE

The radar

The Grand Island radar (KUEX), 100 km from the middle of the area, began a volume at 01:53 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: 5%
One or more EF2 to EF5 tornadoes: 2%
Ten or more severe wind reports: 50%
One or more gusts of 65 knots or more: 10%
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: 90%

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
Jun 20, 8:56 PM CDT	Severe Thunderstorm Warning	GID	Buffalo, Howard, Sherman	49 min
Jun 20, 9:02 PM CDT	Severe Thunderstorm Warning	OAX	Antelope, Madison, Pierce	43 min
Jun 20, 9:08 PM CDT	Severe Thunderstorm Warning	GID	Buffalo, Dawson, Gosper, Phelps	52 min
Jun 20, 9:11 PM CDT	Severe Thunderstorm Warning	OAX	Butler, Colfax, Dodge, Saunders	34 min
Jun 20, 9:12 PM CDT	Severe Thunderstorm Warning	OAX	Cass, Sarpy, Saunders	33 min
Jun 20, 9:23 PM CDT	Severe Thunderstorm Warning	GID	Buffalo, Hall, Howard	52 min
Jun 20, 9:41 PM CDT	Flash Flood Warning	OAX	Douglas, Sarpy	6 hr
Jun 20, 9:45 PM CDT	Severe Thunderstorm Warning	OAX	Cass, Sarpy, Saunders	45 min
Jun 20, 9:47 PM CDT	Severe Thunderstorm Warning	GID	Buffalo, Dawson, Gosper, Phelps	27 min
Jun 20, 9:48 PM CDT	Severe Thunderstorm Warning	GID	Adams, Buffalo, Clay, Hall, Kearney	42 min
Jun 20, 9:50 PM CDT	Severe Thunderstorm Warning	OAX	Colfax, Dodge	40 min
Jun 20, 10:23 PM CDT	Severe Thunderstorm Warning	GID	Adams, Clay, Franklin, Hall, Hamilton, Kearney and 2 more	52 min
Jun 20, 10:26 PM CDT	Severe Thunderstorm Warning	OAX	Douglas, Sarpy	34 min
Jun 20, 11:20 PM CDT	Flash Flood Warning	OAX	Douglas, Sarpy	6 hr
Jun 20, 11:23 PM CDT	Flash Flood Warning	OAX	Dodge, Washington	6 hr
Jun 20, 11:46 PM CDT	Flash Flood Warning	OAX	Colfax	6 hr
Jun 21, 12:08 AM CDT	Severe Thunderstorm Warning	OAX	Dodge, Douglas, Sarpy, Saunders	37 min
Jun 21, 12:12 AM CDT	Flash Flood Warning	OAX	Mills, Pottawattamie	6 hr
Jun 21, 12:15 AM CDT	Severe Thunderstorm Warning	OAX	Cass, Lancaster, Otoe	30 min
Jun 21, 12:33 AM CDT	Flash Flood Warning	EAX	Atchison	4 hr

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 00:00Z, 1.9 hours before the alert went out and 107 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: 2575 J/kg
Mixed-layer CIN: -8 J/kg
Mixed-layer LCL: 1837 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 94 m²/s²
0-3 km storm-relative helicity: 211 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
Jun 20, 8:29 PM CDT	Mesoscale Discussion	SPC	Adair, Adams, Audubon, Calhoun, Carroll, Cass and 15 more	91 min
Jun 20, 11:28 PM CDT	Mesoscale Discussion	SPC	Adair, Adams, Cass, Decatur, Fremont, Harrison and 8 more	92 min
Jun 21, 1:57 AM CDT	Mesoscale Discussion	SPC	Adams, Fremont, Mills, Montgomery, Page, Ringgold and 2 more	63 min
Jun 21, 12:41 PM CDT	Mesoscale Discussion	SPC	Cedar, Clinton, Des Moines, Henry, Jackson, Lee and 3 more	2 hr
Jun 20, 7:05 PM CDT	Mesoscale Discussion	SPC	Cheyenne, Decatur, Norton, Phillips, Rawlins, Sheridan and 2 more	85 min
Jun 21, 3:43 PM CDT	Mesoscale Discussion	SPC	Cheyenne, Greeley, Hamilton, Kearny, Logan, Sherman and 3 more	2 hr
Jun 21, 1:33 PM CDT	Severe Thunderstorm Watch	SPC	Audrain, Boone, Callaway, Knox, Lewis, Lincoln and 7 more	7 hr
Jun 21, 3:41 PM CDT	Mesoscale Discussion	SPC	Lewis, Marion, Monroe, Pike, Ralls, Shelby	64 min
Jun 21, 6:16 PM CDT	Mesoscale Discussion	SPC	Audrain, Boone, Callaway, Lincoln, Marion, Monroe and 10 more	89 min
Jun 21, 2:23 PM CDT	Mesoscale Discussion	SPC	Box Butte, Dawes, Garden, Morrill, Scotts Bluff, Sheridan and 1 more	67 min
Jun 21, 2:56 PM CDT	Severe Thunderstorm Watch	SPC	Arthur, Banner, Box Butte, Brown, Cherry, Cheyenne and 14 more	7 hr
Jun 21, 5:49 PM CDT	Mesoscale Discussion	SPC	Cherry, Grant, Hooker	86 min

Nearby

Severe Thunderstorm Watches in Nebraska, 2014 Severe Thunderstorm Watches in Iowa, 2014 Severe Thunderstorm Watches in Kansas, 2014 Every severe thunderstorm watch in 2014

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.