Alert archive / Nebraska / Tornado Watches in 2001
Tornado Watch 126
The Storm Prediction Center issued this tornado watch at Apr 11, 2001, 2:00 AM CDT for 4 states. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 11, 2001, 2:00 AM CDT (07:00 UTC)
- Expired
- Apr 11, 2001, 7:00 AM CDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
All 49 counties
Crawford County, IA, Fremont County, IA, Harrison County, IA, Mills County, IA, Monona County, IA, Pottawattamie County, IA, Shelby County, IA, Atchison County, KS, Brown County, KS, Clay County, KS, Dickinson County, KS, Douglas County, KS, Franklin County, KS, Geary County, KS, Jackson County, KS, Jefferson County, KS, Marshall County, KS, Morris County, KS, Nemaha County, KS, Osage County, KS, Pottawatomie County, KS, Riley County, KS, Shawnee County, KS, Wabaunsee County, KS, Washington County, KS, Atchison County, MO, Burt County, NE, Butler County, NE, Cass County, NE, Colfax County, NE, Cuming County, NE, Dodge County, NE, Douglas County, NE, Gage County, NE, Jefferson County, NE, Johnson County, NE, Lancaster County, NE, Nemaha County, NE, Otoe County, NE, Pawnee County, NE, Platte County, NE, Richardson County, NE, Saline County, NE, Sarpy County, NE, Saunders County, NE, Seward County, NE, Stanton County, NE, Thurston County, NE, Washington County, NE
The radar
The Omaha radar (KOAX), 70 km from the middle of the area, began a volume at 07:00 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
11 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 11, 2:12 AM CDT | Severe Thunderstorm Warning | OAX | Gage | 63 min |
| Apr 11, 2:28 AM CDT | Severe Thunderstorm Warning | OAX | Burt, Cuming, Dodge | 32 min |
| Apr 11, 2:34 AM CDT | Severe Thunderstorm Warning | OAX | Lancaster | 56 min |
| Apr 11, 2:38 AM CDT | Severe Thunderstorm Warning | OAX | Johnson, Pawnee | 52 min |
| Apr 11, 2:51 AM CDT | Severe Thunderstorm Warning | OAX | Otoe | 54 min |
| Apr 11, 2:58 AM CDT | Severe Thunderstorm Warning | OAX | Nemaha, Richardson | 62 min |
| Apr 11, 3:10 AM CDT | Severe Thunderstorm Warning | EAX | Atchison | 50 min |
| Apr 11, 3:10 AM CDT | Severe Thunderstorm Warning | OAX | Cass | 50 min |
| Apr 11, 3:21 AM CDT | Severe Thunderstorm Warning | OAX | Fremont | 39 min |
| Apr 11, 3:34 AM CDT | Severe Thunderstorm Warning | OAX | Mills | 41 min |
| Apr 11, 3:57 AM CDT | Severe Thunderstorm Warning | OAX | Pottawattamie | 48 min |
The nearest sounding before it
Omaha, NE (KOAX), launched 00:00Z, 7.0 hours before the alert went out and 70 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.
- Mixed-layer CAPE
- 18 J/kg
- Mixed-layer CIN
- -145 J/kg
- Mixed-layer LCL
- 493 m above ground
- 0-6 km bulk shear
- 55 kt
- 0-1 km storm-relative helicity
- 84 m²/s²
- 0-3 km storm-relative helicity
- 131 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.6
The text
As transmitted, in the capitals the NWS used until 2016.
000 WWUS9 KMKC 110632 SEL6 SEL6 MKC WW 110625 IAZ000-KSZ000-MOZ000-NEZ000-111200- URGENT - IMMEDIATE BROADCAST REQUESTED TORNADO WATCH NUMBER 126 STORM PREDICTION CENTER NORMAN OK 125 AM CDT WED APR 11 2001 THE STORM PREDICTION CENTER HAS ISSUED A TORNADO WATCH FOR PORTIONS OF WEST CENTRAL AND SOUTHWEST IOWA NORTHEAST KANSAS EXTREME NORTHWEST MISSOURI EASTERN NEBRASKA EFFECTIVE THIS WEDNESDAY MORNING FROM 200 AM UNTIL 700 AM CDT. TORNADOES...HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 80 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS. THE TORNADO WATCH AREA IS ALONG AND 60 STATUTE MILES EAST AND WEST OF A LINE FROM 65 MILES NORTH NORTHWEST OF OMAHA NEBRASKA TO 45 MILES SOUTH SOUTHEAST OF MANHATTAN KANSAS. REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR TORNADOES AND SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS AND POSSIBLE WARNINGS. OTHER WATCH INFORMATION... CONTINUE...WW 123...WW 124...WW 125... DISCUSSION...INTENSE BOW ECHO IS MOVING RAPIDLY ENEWD ACROSS NORTH CENTRAL KANSAS TOWARD NORTHEAST KANSAS AND SOUTHEAST NEBRASKA... WHILE OTHER CELLS CONTINUE TO DEVELOP AND INTENSIFY IN WARM ADVECTION ZONE OVER EASTERN NEBRASKA TO THE NORTH OF THE WARM FRONT. WINDS ALOFT ARE EXPECTED TO CONTINUE STRENGTHENING THIS MORNING AS UPPER TROUGH LIFTS NEWD TOWARD THE HIGH PLAINS...WITH VERY STRONG LOW LEVEL SHEAR SPREADING ACROSS THE AREA. SEVERE STORMS WITH DAMAGING WINDS...HAIL AND ISOLATED TORNADOES WILL BE POSSIBLE THROUGH THE EARLY MORNING HOURS. AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 70 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450. MEAN STORM MOTION VECTOR 23050. ...WEISS ;383,0972 420,0973 420,0951 383,0951;
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 11, 4:00 AM CDT | Severe Thunderstorm Watch | SPC | Adair, Adams, Appanoose, Audubon, Boone, Carroll and 21 more | 5 hr |
| Apr 11, 10:45 AM CDT | Tornado Watch | SPC | Adams, Cass, Crawford, Fremont, Harrison, Mills and 8 more | 5 hr |
| Apr 11, 12:00 PM CDT | Tornado Watch | SPC | Adair, Appanoose, Audubon, Benton, Black Hawk, Boone and 46 more | 5 hr |
| Apr 11, 4:00 PM CDT | Tornado Watch | SPC | Allamakee, Benton, Black Hawk, Bremer, Buchanan, Butler and 40 more | 6 hr |
| Apr 10, 8:30 PM CDT | Severe Thunderstorm Watch | SPC | Cheyenne, Decatur, Finney, Gove, Grant, Gray and 18 more | 5 hr |
| Apr 10, 10:15 PM CDT | Severe Thunderstorm Watch | SPC | Ellis, Graham, Hodgeman, Jewell, Mitchell, Ness and 9 more | 6 hr |
| Apr 11, 12:00 AM CDT | Tornado Watch | SPC | Barber, Barton, Clark, Cloud, Comanche, Edwards and 20 more | 4 hr |
| Apr 11, 3:15 AM CDT | Tornado Watch | SPC | Allen, Anderson, Butler, Chase, Chautauqua, Coffey and 13 more | 5 hr |
| Apr 11, 9:30 AM CDT | Tornado Watch | SPC | Doniphan, Johnson, Leavenworth, Miami, Wyandotte | 6 hr |
| Apr 10, 7:00 PM CDT | Severe Thunderstorm Watch | SPC | Audrain, Franklin, Jefferson, Lincoln, Montgomery, Saint Charles and 4 more | 5 hr |
| Apr 11, 6:15 AM CDT | Tornado Watch | SPC | Barry, McDonald, Newton, Stone | 6 hr |
| Apr 11, 10:00 AM CDT | Severe Thunderstorm Watch | SPC | Butler, Carter, Douglas, Howell, Oregon, Ozark and 2 more | 5 hr |
| Apr 11, 1:00 PM CDT | Tornado Watch | SPC | Adair, Audrain, Boone, Callaway, Clark, Cole and 20 more | 6 hr |
Nearby
Tornado Watches in Nebraska, 2001Tornado Watches in Kansas, 2001Tornado Watches in Iowa, 2001Every tornado 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.