Alert archive / Nebraska / Severe Thunderstorm Watches in 2016

Severe Thunderstorm Watch 156

May 9, 201621 counties in Iowa; Atchison County, Holt County, Nodaway County, Missouri; 42 counties in Nebraska

The Storm Prediction Center issued this severe thunderstorm watch at May 9, 2016, 5:13 PM CDT for 21 counties in Iowa; Atchison County, Holt County, Nodaway County, Missouri; 42 counties in Nebraska. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued: May 9, 2016, 5:13 PM CDT (22:13 UTC)
Expired: May 9, 2016, 11:00 PM CDT
In force: 6 hr
Issued by: the Storm Prediction Center
Largest hail expected: 2 in
Strongest gust expected: 60 kt

All 66 counties

Adair County, IA, Adams County, IA, Audubon County, IA, Calhoun County, IA, Carroll County, IA, Cass County, IA, Crawford County, IA, Fremont County, IA, Greene County, IA, Guthrie County, IA, Harrison County, IA, Mills County, IA, Monona County, IA, Montgomery County, IA, Page County, IA, Pottawattamie County, IA, Ringgold County, IA, Sac County, IA, Shelby County, IA, Taylor County, IA, Union County, IA, Atchison County, MO, Holt County, MO, Nodaway County, MO, Adams County, NE, Buffalo County, NE, Burt County, NE, Butler County, NE, Cass County, NE, Clay County, NE, Colfax County, NE, Cuming County, NE, Dodge County, NE, Douglas County, NE, Fillmore County, NE, Franklin County, NE, Gage County, NE, Hall County, NE, Hamilton County, NE, Harlan 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, Platte County, NE, Polk County, NE, Richardson 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

The radar

The Omaha radar (KOAX), 62 km from the middle of the area, began a volume at 22:17 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: 2%
Ten or more severe wind reports: 30%
One or more gusts of 65 knots or more: 5%
Ten or more severe hail reports: 70%
One or more hailstones of 2 inches or more: 30%
Six or more combined severe hail and wind reports: 90%

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
May 9, 5:13 PM CDT	Severe Thunderstorm Warning	GID	Phelps	47 min
May 9, 5:13 PM CDT	Severe Thunderstorm Warning	GID	Phelps	47 min
May 9, 5:17 PM CDT	Tornado Warning	GID	Clay	28 min
May 9, 5:20 PM CDT	Severe Thunderstorm Warning	OAX	Lancaster	25 min
May 9, 5:23 PM CDT	Severe Thunderstorm Warning	GID	Fillmore	52 min
May 9, 5:24 PM CDT	Flash Flood Warning	OAX	Lancaster	3 hr
May 9, 5:29 PM CDT	Severe Thunderstorm Warning	GID	Clay	46 min
May 9, 5:36 PM CDT	Severe Thunderstorm Warning	OAX	Fremont, Mills	24 min
May 9, 5:39 PM CDT	Tornado Warning	OAX	Cass, Lancaster, Otoe	36 min
May 9, 5:42 PM CDT	Severe Thunderstorm Warning	GID	Fillmore, York	48 min
May 9, 5:43 PM CDT	Severe Thunderstorm Warning	OAX	Lancaster	32 min
May 9, 5:47 PM CDT	Severe Thunderstorm Warning	GID	Nuckolls	43 min
May 9, 5:49 PM CDT	Tornado Warning	OAX	Cass	26 min
May 9, 5:54 PM CDT	Severe Thunderstorm Warning	EAX	Atchison	51 min
May 9, 5:54 PM CDT	Severe Thunderstorm Warning	OAX	Lancaster, Saline, Seward	36 min
May 9, 5:59 PM CDT	Severe Thunderstorm Warning	OAX	Cass	31 min
May 9, 6:10 PM CDT	Severe Thunderstorm Warning	OAX	Cass, Lancaster, Otoe	35 min
May 9, 6:14 PM CDT	Severe Thunderstorm Warning	GID	Fillmore	28 min
May 9, 6:14 PM CDT	Severe Thunderstorm Warning	OAX	Gage, Lancaster, Saline	31 min
May 9, 6:14 PM CDT	Tornado Warning Tornado observed	OAX	Cass	16 min
May 9, 6:28 PM CDT	Severe Thunderstorm Warning	OAX	Cass	32 min
May 9, 6:41 PM CDT	Severe Thunderstorm Warning	OAX	Gage, Lancaster, Saline	34 min
May 9, 6:43 PM CDT	Severe Thunderstorm Warning	DMX	Audubon, Guthrie	32 min
May 9, 6:48 PM CDT	Severe Thunderstorm Warning	OAX	Cass, Lancaster, Otoe	42 min
May 9, 7:03 PM CDT	Severe Thunderstorm Warning	OAX	Cass, Otoe	27 min
May 9, 7:06 PM CDT	Severe Thunderstorm Warning	GID	Thayer	39 min
May 9, 7:09 PM CDT	Severe Thunderstorm Warning	OAX	Jefferson, Saline	36 min
May 9, 7:15 PM CDT	Severe Thunderstorm Warning	DMX	Audubon, Guthrie	45 min
May 9, 7:15 PM CDT	Severe Thunderstorm Warning	OAX	Fremont, Page	45 min
May 9, 7:19 PM CDT	Flash Flood Warning	OAX	Saline	4 hr
May 9, 7:25 PM CDT	Severe Thunderstorm Warning	OAX	Otoe	35 min
May 9, 7:35 PM CDT	Severe Thunderstorm Warning	OAX	Thurston, Wayne	25 min
May 9, 7:55 PM CDT	Severe Thunderstorm Warning	OAX	Otoe	35 min
May 9, 7:58 PM CDT	Severe Thunderstorm Warning	OAX	Cedar, Wayne	32 min
May 9, 8:00 PM CDT	Severe Thunderstorm Warning	DMX	Audubon, Carroll, Greene, Guthrie	45 min
May 9, 8:00 PM CDT	Severe Thunderstorm Warning	OAX	Montgomery, Page	30 min
May 9, 8:05 PM CDT	Tornado Warning Tornado observed	DMX	Guthrie	25 min
May 9, 8:30 PM CDT	Flash Flood Warning	OAX	Cass, Lancaster, Otoe	3 hr
May 9, 8:31 PM CDT	Severe Thunderstorm Warning	OAX	Wayne	29 min
May 9, 8:32 PM CDT	Flash Flood Warning	OAX	Wayne	3 hr
May 9, 8:37 PM CDT	Severe Thunderstorm Warning	DMX	Audubon, Carroll, Crawford	37 min
May 9, 9:06 PM CDT	Severe Thunderstorm Warning	OAX	Madison, Stanton	24 min
May 9, 10:26 PM CDT	Flash Flood Warning	DMX	Audubon, Carroll, Guthrie	6 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 12:00Z, 10.2 hours before the alert went out and 61 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1443 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: 240 m²/s²
0-3 km storm-relative helicity: 204 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 9, 2:26 PM CDT	Mesoscale Discussion	SPC	Cherokee, Clay, Lyon, O'Brien, Osceola, Plymouth and 2 more	94 min
May 9, 4:52 PM CDT	Mesoscale Discussion	SPC	Adams, Audubon, Cass, Crawford, Fremont, Harrison and 7 more	53 min
May 9, 1:46 PM CDT	Mesoscale Discussion	SPC	Atchison, Buchanan, Holt, Platte	59 min
May 9, 6:38 PM CDT	Mesoscale Discussion	SPC	Bollinger, Butler, Carter, Dunklin, Howell, Madison and 6 more	97 min
May 8, 7:48 PM CDT	Mesoscale Discussion	SPC	Adams, Blaine, Brown, Buffalo, Clay, Custer and 23 more	117 min
May 8, 9:08 PM CDT	Severe Thunderstorm Watch	SPC	Jefferson, Saline, Seward	3 hr
May 8, 11:17 PM CDT	Mesoscale Discussion	SPC	Gage, Jefferson, Johnson, Lancaster, Otoe, Saline and 2 more	88 min
May 9, 3:35 AM CDT	Mesoscale Discussion	SPC	Gage, Jefferson, Pawnee, Thayer	115 min

Nearby

Severe Thunderstorm Watches in Nebraska, 2016 Severe Thunderstorm Watches in Iowa, 2016 Severe Thunderstorm Watches in Missouri, 2016 Every severe thunderstorm watch in 2016

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.