Alert archive / Kansas / Severe Thunderstorm Watches in 2014

Severe Thunderstorm Watch 71

April 12, 20144 states

The Storm Prediction Center issued this severe thunderstorm watch at Apr 12, 2014, 6:26 PM CDT for 4 states. It was in force for 8 hr.

The area

The outline as issued.

The facts

Issued: Apr 12, 2014, 6:26 PM CDT (23:26 UTC)
Expired: Apr 13, 2014, 2:00 AM CDT
In force: 8 hr
Issued by: the Storm Prediction Center
Largest hail expected: 2 in
Strongest gust expected: 65 kt

All 61 counties

Adams County, IA, Appanoose County, IA, Clarke County, IA, Davis County, IA, Decatur County, IA, Fremont County, IA, Lucas County, IA, Mills County, IA, Monroe County, IA, Montgomery County, IA, Page County, IA, Ringgold County, IA, Taylor County, IA, Union County, IA, Wapello County, IA, Wayne County, IA, Atchison County, KS, Barton County, KS, Brown County, KS, Chase County, KS, Clay County, KS, Dickinson County, KS, Doniphan County, KS, Ellsworth County, KS, Geary County, KS, Harvey County, KS, Jackson County, KS, Jefferson County, KS, Lincoln County, KS, Lyon County, KS, Marion County, KS, Marshall County, KS, McPherson County, KS, Morris County, KS, Nemaha County, KS, Ottawa County, KS, Pottawatomie County, KS, Reno County, KS, Rice County, KS, Riley County, KS, Russell County, KS, Saline County, KS, Shawnee County, KS, Wabaunsee County, KS, Washington County, KS, Andrew County, MO, Atchison County, MO, Buchanan County, MO, DeKalb County, MO, Gentry County, MO, Harrison County, MO, Holt County, MO, Mercer County, MO, Nodaway County, MO, Worth County, MO, Gage County, NE, Johnson County, NE, Nemaha County, NE, Otoe County, NE, Pawnee County, NE, Richardson County, NE

The radar

The Topeka radar (KTWX), 40 km from the middle of the area, began a volume at 23:29 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: 30%
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

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

Issued	Product	Office	Counties	Lasted
Apr 12, 6:39 PM CDT	Severe Thunderstorm Warning	OAX	Fremont, Page	51 min
Apr 12, 6:42 PM CDT	Severe Thunderstorm Warning	OAX	Fremont, Mills, Montgomery	48 min
Apr 12, 6:45 PM CDT	Severe Thunderstorm Warning	TOP	Clay, Riley	45 min
Apr 12, 6:58 PM CDT	Severe Thunderstorm Warning	OAX	Mills, Montgomery, Pottawattamie	47 min
Apr 12, 7:13 PM CDT	Severe Thunderstorm Warning	TOP	Marshall, Pottawatomie, Riley, Washington	47 min
Apr 12, 7:26 PM CDT	Severe Thunderstorm Warning	TOP	Clay, Riley	49 min
Apr 12, 7:29 PM CDT	Severe Thunderstorm Warning	OAX	Fremont, Mills, Montgomery, Page	46 min
Apr 12, 7:43 PM CDT	Severe Thunderstorm Warning	OAX	Mills, Montgomery, Pottawattamie	47 min
Apr 12, 7:49 PM CDT	Severe Thunderstorm Warning	TOP	Marshall, Nemaha	41 min
Apr 12, 7:54 PM CDT	Severe Thunderstorm Warning	DMX	Adair, Adams, Cass	51 min
Apr 12, 7:55 PM CDT	Severe Thunderstorm Warning	TOP	Marshall, Riley, Washington	50 min
Apr 12, 7:58 PM CDT	Severe Thunderstorm Warning	ICT	McPherson, Rice	47 min
Apr 12, 8:13 PM CDT	Severe Thunderstorm Warning	OAX	Montgomery	47 min
Apr 12, 8:13 PM CDT	Severe Thunderstorm Warning	TOP	Marshall, Pottawatomie, Riley	47 min
Apr 12, 8:15 PM CDT	Severe Thunderstorm Warning	OAX	Richardson	30 min
Apr 12, 8:23 PM CDT	Severe Thunderstorm Warning	TOP	Riley	37 min
Apr 12, 8:29 PM CDT	Severe Thunderstorm Warning	OAX	Montgomery, Pottawattamie	31 min
Apr 12, 8:34 PM CDT	Severe Thunderstorm Warning	DMX	Adair, Adams, Cass	41 min
Apr 12, 8:34 PM CDT	Severe Thunderstorm Warning	TOP	Brown	26 min
Apr 12, 8:36 PM CDT	Severe Thunderstorm Warning	EAX	Andrew, Atchison, Holt, Nodaway	39 min
Apr 12, 8:39 PM CDT	Severe Thunderstorm Warning	OAX	Richardson	36 min
Apr 12, 8:44 PM CDT	Severe Thunderstorm Warning	TOP	Pottawatomie, Riley	46 min
Apr 12, 8:57 PM CDT	Severe Thunderstorm Warning	OAX	Montgomery	33 min
Apr 12, 8:58 PM CDT	Severe Thunderstorm Warning	TOP	Marshall, Pottawatomie, Riley	47 min
Apr 12, 9:12 PM CDT	Severe Thunderstorm Warning	DMX	Adair, Adams	33 min
Apr 12, 9:21 PM CDT	Severe Thunderstorm Warning	EAX	Atchison, Nodaway, Worth	39 min
Apr 12, 9:30 PM CDT	Severe Thunderstorm Warning	OAX	Page	45 min
Apr 12, 9:30 PM CDT	Severe Thunderstorm Warning	TOP	Jackson, Nemaha, Pottawatomie	45 min
Apr 12, 9:44 PM CDT	Severe Thunderstorm Warning	DMX	Adair, Adams, Madison, Union	46 min
Apr 12, 10:07 PM CDT	Severe Thunderstorm Warning	DMX	Clarke, Madison, Union, Warren	38 min
Apr 12, 10:15 PM CDT	Severe Thunderstorm Warning	DMX	Decatur, Ringgold	45 min
Apr 12, 10:26 PM CDT	Severe Thunderstorm Warning	DMX	Clarke, Madison, Union, Warren	34 min
Apr 12, 10:31 PM CDT	Severe Thunderstorm Warning	TOP	Brown, Marshall, Nemaha	44 min
Apr 12, 10:44 PM CDT	Severe Thunderstorm Warning	DMX	Clarke, Lucas, Marion, Monroe, Warren	46 min
Apr 12, 10:54 PM CDT	Severe Thunderstorm Warning	DMX	Wayne	36 min
Apr 12, 10:59 PM CDT	Severe Thunderstorm Warning	TOP	Nemaha	46 min
Apr 12, 11:20 PM CDT	Severe Thunderstorm Warning	DMX	Appanoose, Davis, Jasper, Mahaska, Marion, Monroe and 2 more	55 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

Topeka, KS (KFOE), launched 12:00Z, 11.4 hours before the alert went out and 88 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: 424 J/kg
Mixed-layer CIN: -339 J/kg
Mixed-layer LCL: 794 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 200 m²/s²
0-3 km storm-relative helicity: 178 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 12, 10:24 AM CDT	Mesoscale Discussion	SPC	Allamakee, Winneshiek	2 hr
Apr 12, 2:30 PM CDT	Mesoscale Discussion	SPC	Adair, Audubon, Benton, Black Hawk, Boone, Bremer and 44 more	2 hr
Apr 12, 3:15 PM CDT	Severe Thunderstorm Watch	SPC	Adair, Allamakee, Audubon, Benton, Black Hawk, Boone and 50 more	7 hr
Apr 12, 4:46 PM CDT	Mesoscale Discussion	SPC	Adams, Cass, Fremont, Mills, Montgomery, Page and 4 more	59 min
Apr 12, 6:20 PM CDT	Mesoscale Discussion	SPC	Adair, Adams, Allamakee, Audubon, Benton, Black Hawk and 46 more	55 min

Nearby

Severe Thunderstorm Watches in Kansas, 2014 Severe Thunderstorm Watches in Iowa, 2014 Severe Thunderstorm Watches in Missouri, 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.