Alert archive / Nebraska / Tornado Watches in 2010

Tornado Watch 656

September 13, 20105 counties in Iowa; 20 counties in Kansas; 48 counties in Nebraska

The Storm Prediction Center issued this tornado watch at Sep 13, 2010, 2:38 PM CDT for 5 counties in Iowa; 20 counties in Kansas; 48 counties in Nebraska. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued: Sep 13, 2010, 2:38 PM CDT (19:38 UTC)
Expired: Sep 13, 2010, 9:58 PM CDT
In force: 7 hr
Issued by: the Storm Prediction Center
Largest hail expected: 2.5 in
Strongest gust expected: 60 kt

All 73 counties

Fremont County, IA, Mills County, IA, Montgomery County, IA, Page County, IA, Pottawattamie County, IA, Brown County, KS, Clay County, KS, Cloud County, KS, Decatur County, KS, Graham County, KS, Jackson County, KS, Jewell County, KS, Marshall County, KS, Mitchell County, KS, Nemaha County, KS, Norton County, KS, Osborne County, KS, Ottawa County, KS, Phillips County, KS, Pottawatomie County, KS, Republic County, KS, Riley County, KS, Rooks County, KS, Smith County, KS, Washington County, KS, Adams County, NE, Boone County, NE, Buffalo County, NE, Butler County, NE, Cass County, NE, Clay County, NE, Colfax County, NE, Custer County, NE, Dawson County, NE, Dodge County, NE, Douglas County, NE, Fillmore County, NE, Franklin County, NE, Frontier 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, Lincoln 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, Red Willow County, NE, Richardson County, NE, Saline County, NE, Sarpy County, NE, Saunders County, NE, Seward County, NE, Sherman County, NE, Thayer County, NE, Valley County, NE, Washington County, NE, Webster County, NE, York County, NE

The radar

The Grand Island radar (KUEX), 22 km from the middle of the area, began a volume at 19:38 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: 40%
One or more EF2 to EF5 tornadoes: 20%
Ten or more severe wind reports: 30%
One or more gusts of 65 knots or more: 30%
Ten or more severe hail reports: 40%
One or more hailstones of 2 inches or more: 50%
Six or more combined severe hail and wind reports: 70%

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
Sep 13, 2:45 PM CDT	Severe Thunderstorm Warning	GID	Thayer	30 min
Sep 13, 2:51 PM CDT	Severe Thunderstorm Warning	OAX	Jefferson, Saline	54 min
Sep 13, 3:12 PM CDT	Severe Thunderstorm Warning	GID	Thayer	18 min
Sep 13, 3:23 PM CDT	Severe Thunderstorm Warning	OAX	Colfax, Platte	52 min
Sep 13, 3:35 PM CDT	Severe Thunderstorm Warning	OAX	Gage, Jefferson	46 min
Sep 13, 3:38 PM CDT	Severe Thunderstorm Warning	OAX	Gage, Lancaster, Saline	37 min
Sep 13, 3:48 PM CDT	Severe Thunderstorm Warning	GID	Jewell, Mitchell	27 min
Sep 13, 3:53 PM CDT	Severe Thunderstorm Warning	TOP	Cloud, Republic	52 min
Sep 13, 4:00 PM CDT	Severe Thunderstorm Warning	OAX	Butler, Colfax, Dodge, Saunders	60 min
Sep 13, 4:03 PM CDT	Tornado Warning	OAX	Jefferson	42 min
Sep 13, 4:07 PM CDT	Tornado Warning	TOP	Washington	38 min
Sep 13, 4:29 PM CDT	Severe Thunderstorm Warning	OAX	Douglas, Sarpy, Saunders	46 min
Sep 13, 4:42 PM CDT	Severe Thunderstorm Warning	TOP	Cloud	48 min
Sep 13, 4:43 PM CDT	Tornado Warning	TOP	Marshall, Washington	47 min
Sep 13, 5:05 PM CDT	Severe Thunderstorm Warning	OAX	Cass, Lancaster, Sarpy, Saunders	40 min
Sep 13, 5:15 PM CDT	Severe Thunderstorm Warning	GLD	Norton	30 min
Sep 13, 5:18 PM CDT	Severe Thunderstorm Warning	GID	Phillips	27 min
Sep 13, 5:25 PM CDT	Severe Thunderstorm Warning	TOP	Marshall, Washington	50 min
Sep 13, 5:27 PM CDT	Tornado Warning	GLD	Norton	22 min
Sep 13, 5:28 PM CDT	Tornado Warning	GLD	Norton	14 min
Sep 13, 5:28 PM CDT	Severe Thunderstorm Warning	TOP	Cloud	29 min
Sep 13, 5:29 PM CDT	Severe Thunderstorm Warning	OAX	Cass, Lancaster, Otoe, Sarpy, Saunders	46 min
Sep 13, 5:34 PM CDT	Severe Thunderstorm Warning	OAX	Gage, Jefferson	41 min
Sep 13, 5:37 PM CDT	Tornado Warning	OAX	Cass, Otoe	38 min
Sep 13, 5:44 PM CDT	Severe Thunderstorm Warning	GID	Adams, Nuckolls, Webster	31 min
Sep 13, 6:00 PM CDT	Severe Thunderstorm Warning	OAX	Cass, Gage, Johnson, Lancaster, Nemaha, Otoe	45 min
Sep 13, 6:12 PM CDT	Severe Thunderstorm Warning	TOP	Marshall	48 min
Sep 13, 6:13 PM CDT	Severe Thunderstorm Warning	GID	Harlan, Phelps	32 min
Sep 13, 6:13 PM CDT	Severe Thunderstorm Warning	OAX	Gage, Jefferson	26 min
Sep 13, 6:16 PM CDT	Severe Thunderstorm Warning	TOP	Washington	44 min
Sep 13, 6:23 PM CDT	Severe Thunderstorm Warning	OAX	Fremont	52 min
Sep 13, 6:23 PM CDT	Severe Thunderstorm Warning	GID	Adams, Clay	24 min
Sep 13, 6:25 PM CDT	Flash Flood Warning	TOP	Marshall, Washington	2 hr
Sep 13, 6:28 PM CDT	Severe Thunderstorm Warning	OAX	Johnson, Nemaha, Pawnee, Richardson	62 min
Sep 13, 6:36 PM CDT	Severe Thunderstorm Warning	GID	Clay	24 min
Sep 13, 6:40 PM CDT	Tornado Warning	TOP	Marshall, Washington	35 min
Sep 13, 6:42 PM CDT	Severe Thunderstorm Warning	GID	Franklin, Harlan, Kearney, Phelps	33 min
Sep 13, 6:49 PM CDT	Severe Thunderstorm Warning	OAX	Nemaha, Richardson	41 min
Sep 13, 6:52 PM CDT	Tornado Warning	TOP	Marshall	23 min
Sep 13, 6:58 PM CDT	Severe Thunderstorm Warning	TOP	Marshall, Washington	47 min
Sep 13, 6:58 PM CDT	Severe Thunderstorm Warning	GID	Clay, Fillmore, Hamilton, York	47 min
Sep 13, 7:09 PM CDT	Severe Thunderstorm Warning	GID	Kearney	36 min
Sep 13, 7:14 PM CDT	Tornado Warning	TOP	Marshall, Pottawatomie, Riley, Washington	46 min
Sep 13, 7:17 PM CDT	Severe Thunderstorm Warning	OAX	Gage	19 min
Sep 13, 7:24 PM CDT	Severe Thunderstorm Warning	TOP	Brown, Nemaha	51 min
Sep 13, 7:26 PM CDT	Severe Thunderstorm Warning	OAX	Richardson	34 min
Sep 13, 7:59 PM CDT	Severe Thunderstorm Warning	TOP	Marshall, Pottawatomie, Riley	41 min
Sep 13, 8:32 PM CDT	Severe Thunderstorm Warning	GID	Hall, Hamilton, Merrick	21 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

N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 7.6 hours before the alert went out and 186 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: 70 J/kg
Mixed-layer CIN: -357 J/kg
Mixed-layer LCL: 1882 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 16 m²/s²
0-3 km storm-relative helicity: 11 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
Sep 13, 5:45 PM CDT	Mesoscale Discussion	SPC	Adams, Fremont, Montgomery, Page, Ringgold, Taylor	60 min
Sep 13, 6:09 PM CDT	Severe Thunderstorm Watch	SPC	Adams, Clarke, Decatur, Ringgold, Taylor, Union and 1 more	4 hr
Sep 13, 1:38 PM CDT	Mesoscale Discussion	SPC	Brown, Clay, Cloud, Dickinson, Ellsworth, Geary and 18 more	67 min
Sep 13, 5:07 PM CDT	Mesoscale Discussion	SPC	Barber, Barton, Clark, Comanche, Edwards, Ellis and 15 more	53 min
Sep 13, 6:30 PM CDT	Mesoscale Discussion	SPC	Cloud, Decatur, Jewell, Marshall, Norton, Phillips and 3 more	60 min

Nearby

Tornado Watches in Nebraska, 2010 Tornado Watches in Kansas, 2010 Tornado Watches in Iowa, 2010 Every tornado watch in 2010

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.