Alert archive / Kansas / Severe Thunderstorm Watches in 2001

Severe Thunderstorm Watch 159

April 20, 20014 states

The Storm Prediction Center issued this severe thunderstorm watch at Apr 20, 2001, 8:15 PM CDT for 4 states. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued: Apr 20, 2001, 8:15 PM CDT (01:15 UTC)
Expired: Apr 21, 2001, 2:00 AM CDT
In force: 6 hr
Issued by: the Storm Prediction Center

All 81 counties

Adams County, IA, Clarke County, IA, Decatur County, IA, Fremont County, IA, Mills County, IA, Montgomery County, IA, Page County, IA, Ringgold County, IA, Taylor County, IA, Union County, IA, Atchison County, KS, Brown County, KS, Clay County, KS, Cloud County, KS, Dickinson County, KS, Doniphan County, KS, Douglas County, KS, Franklin County, KS, Geary County, KS, Jackson County, KS, Jefferson County, KS, Jewell County, KS, Johnson County, KS, Leavenworth County, KS, Lincoln County, KS, Lyon County, KS, Marion County, KS, Marshall County, KS, McPherson County, KS, Miami County, KS, Mitchell County, KS, Morris County, KS, Nemaha County, KS, Osage County, KS, Ottawa County, KS, Pottawatomie County, KS, Republic County, KS, Riley County, KS, Saline County, KS, Shawnee County, KS, Wabaunsee County, KS, Washington County, KS, Wyandotte County, KS, Andrew County, MO, Atchison County, MO, Buchanan County, MO, Caldwell County, MO, Carroll County, MO, Cass County, MO, Clay County, MO, Clinton County, MO, Daviess County, MO, DeKalb County, MO, Gentry County, MO, Harrison County, MO, Holt County, MO, Jackson County, MO, Johnson County, MO, Lafayette County, MO, Livingston County, MO, Nodaway County, MO, Platte County, MO, Ray County, MO, Worth County, MO, Cass County, NE, Clay County, NE, Fillmore County, NE, Gage County, NE, Hamilton County, NE, Jefferson County, NE, Johnson County, NE, Lancaster County, NE, Nemaha County, NE, Nuckolls County, NE, Otoe County, NE, Pawnee County, NE, Richardson County, NE, Saline County, NE, Seward County, NE, Thayer County, NE, York County, NE

The radar

The Topeka radar (KTWX), 108 km from the middle of the area, began a volume at 01:17 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.

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
Apr 20, 8:28 PM CDT	Severe Thunderstorm Warning	GID	Fillmore, Thayer	62 min
Apr 20, 8:39 PM CDT	Severe Thunderstorm Warning	TOP	Washington	51 min
Apr 20, 8:43 PM CDT	Severe Thunderstorm Warning	OAX	Jefferson, Saline	47 min
Apr 20, 8:44 PM CDT	Severe Thunderstorm Warning	GID	Hamilton, York	46 min
Apr 20, 8:51 PM CDT	Severe Thunderstorm Warning	TOP	Clay, Cloud, Ottawa	49 min
Apr 20, 8:52 PM CDT	Severe Thunderstorm Warning	ICT	Saline	53 min
Apr 20, 8:52 PM CDT	Severe Thunderstorm Warning	OAX	Seward	38 min
Apr 20, 8:58 PM CDT	Tornado Warning	GID	Fillmore	32 min
Apr 20, 9:17 PM CDT	Severe Thunderstorm Warning	OAX	Gage, Lancaster, Saline, Seward	38 min
Apr 20, 9:36 PM CDT	Tornado Warning	TOP	Dickinson	39 min
Apr 20, 9:39 PM CDT	Severe Thunderstorm Warning	OAX	Butler, Dodge, Lancaster, Saunders	36 min
Apr 20, 9:39 PM CDT	Severe Thunderstorm Warning	OAX	Cass, Otoe	36 min
Apr 20, 9:42 PM CDT	Severe Thunderstorm Warning	OAX	Johnson, Pawnee	33 min
Apr 20, 9:46 PM CDT	Severe Thunderstorm Warning	ICT	Saline	44 min
Apr 20, 9:48 PM CDT	Severe Thunderstorm Warning	OAX	Mills	37 min
Apr 20, 10:00 PM CDT	Severe Thunderstorm Warning	OAX	Nemaha	45 min
Apr 20, 10:06 PM CDT	Severe Thunderstorm Warning	TOP	Geary, Riley	39 min
Apr 20, 10:07 PM CDT	Severe Thunderstorm Warning	OAX	Mills, Pottawattamie	38 min
Apr 20, 10:12 PM CDT	Tornado Warning	TOP	Dickinson	33 min
Apr 20, 10:14 PM CDT	Severe Thunderstorm Warning	OAX	Pawnee	31 min
Apr 20, 10:34 PM CDT	Severe Thunderstorm Warning	OAX	Montgomery, Pottawattamie	41 min
Apr 20, 10:36 PM CDT	Tornado Warning	TOP	Geary	24 min
Apr 20, 10:53 PM CDT	Severe Thunderstorm Warning	TOP	Pottawatomie, Wabaunsee	37 min
Apr 20, 10:58 PM CDT	Tornado Warning	TOP	Geary	17 min
Apr 20, 11:08 PM CDT	Severe Thunderstorm Warning	DMX	Adair, Adams, Taylor	42 min
Apr 20, 11:08 PM CDT	Tornado Warning	TOP	Wabaunsee	37 min
Apr 20, 11:09 PM CDT	Severe Thunderstorm Warning	TOP	Jackson, Shawnee	36 min
Apr 20, 11:29 PM CDT	Severe Thunderstorm Warning	TOP	Pottawatomie, Riley	31 min
Apr 20, 11:35 PM CDT	Severe Thunderstorm Warning	TOP	Jefferson	40 min
Apr 20, 11:41 PM CDT	Tornado Warning	TOP	Shawnee	34 min
Apr 20, 11:43 PM CDT	Severe Thunderstorm Warning	ICT	Saline	47 min
Apr 20, 11:44 PM CDT	Severe Thunderstorm Warning	EAX	Andrew, DeKalb	46 min
Apr 20, 11:55 PM CDT	Severe Thunderstorm Warning	TOP	Clay, Dickinson, Ottawa	35 min
Apr 21, 12:04 AM CDT	Severe Thunderstorm Warning	EAX	Leavenworth	56 min
Apr 21, 12:08 AM CDT	Tornado Warning	TOP	Jefferson	22 min
Apr 21, 12:12 AM CDT	Severe Thunderstorm Warning	EAX	Platte	48 min
Apr 21, 12:26 AM CDT	Severe Thunderstorm Warning	EAX	Clay, Clinton	49 min
Apr 21, 12:28 AM CDT	Severe Thunderstorm Warning	TOP	Dickinson, Geary, Riley	32 min
Apr 21, 12:34 AM CDT	Severe Thunderstorm Warning	TOP	Brown, Nemaha	26 min
Apr 21, 12:40 AM CDT	Severe Thunderstorm Warning	ICT	Saline	65 min
Apr 21, 1:14 AM CDT	Severe Thunderstorm Warning	EAX	Clay, Clinton	46 min
Apr 21, 1:37 AM CDT	Severe Thunderstorm Warning	TOP	Shawnee, Wabaunsee	23 min
Apr 21, 1:43 AM CDT	Severe Thunderstorm Warning	TOP	Dickinson, Geary, Morris	32 min

The nearest sounding before it

Topeka, KS (KTOP), launched 00:00Z, 1.3 hours before the alert went out and 126 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: 2129 J/kg
Mixed-layer CIN: -27 J/kg
Mixed-layer LCL: 1308 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 204 m²/s²
0-3 km storm-relative helicity: 175 m²/s²
Significant tornado parameter: 1.3
Supercell composite: 8.9

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 20, 8:15 PM CDT	Severe Thunderstorm Watch	SPC	Adair, Adams, Audubon, Boone, Buena Vista, Calhoun and 29 more	6 hr
Apr 20, 11:15 PM CDT	Severe Thunderstorm Watch	SPC	Allamakee, Appanoose, Benton, Black Hawk, Boone, Bremer and 44 more	5 hr
Apr 21, 1:30 AM CDT	Severe Thunderstorm Watch	SPC	Atchison, Brown, Chase, Clay, Dickinson, Doniphan and 20 more	5 hr
Apr 21, 6:00 PM CDT	Severe Thunderstorm Watch	SPC	Audrain, Callaway, Crawford, Franklin, Gasconade, Jefferson and 14 more	5 hr

Nearby

Severe Thunderstorm Watches in Kansas, 2001 Severe Thunderstorm Watches in Missouri, 2001 Severe Thunderstorm Watches in Nebraska, 2001 Every severe thunderstorm watch in 2001

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.