Alert archive / Nebraska / Tornado Watches in 2001

Tornado Watch 172

April 22, 200114 counties in Iowa; 39 counties in Nebraska

The Storm Prediction Center issued this tornado watch at Apr 22, 2001, 3:45 PM CDT for 14 counties in Iowa; 39 counties in Nebraska. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued: Apr 22, 2001, 3:45 PM CDT (20:45 UTC)
Expired: Apr 22, 2001, 9:00 PM CDT
In force: 5 hr
Issued by: the Storm Prediction Center

All 53 counties

Audubon County, IA, Calhoun County, IA, Carroll County, IA, Crawford County, IA, Greene County, IA, Harrison County, IA, Ida County, IA, Mills County, IA, Monona County, IA, Pottawattamie County, IA, Sac County, IA, Shelby County, IA, Webster County, IA, Woodbury County, IA, Adams County, NE, Burt County, NE, Butler County, NE, Cass County, NE, Clay County, NE, Colfax County, NE, Cuming County, NE, Dakota County, NE, Dixon 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, Nuckolls County, NE, Otoe County, NE, Platte County, NE, Polk 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

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
Apr 22, 4:38 PM CDT	Severe Thunderstorm Warning	GID	Harlan	52 min
Apr 22, 4:39 PM CDT	Severe Thunderstorm Warning	FSD	Dixon	36 min
Apr 22, 5:25 PM CDT	Tornado Warning	OAX	Saline, Seward	35 min
Apr 22, 5:26 PM CDT	Severe Thunderstorm Warning	OAX	Lancaster, Saunders	34 min
Apr 22, 5:26 PM CDT	Severe Thunderstorm Warning	OAX	Gage, Saline	34 min
Apr 22, 5:58 PM CDT	Severe Thunderstorm Warning	OAX	Cass, Douglas, Sarpy, Saunders	32 min
Apr 22, 6:26 PM CDT	Tornado Warning	OAX	Gage, Saline	34 min
Apr 22, 6:37 PM CDT	Tornado Warning	OAX	Lancaster	38 min
Apr 22, 6:59 PM CDT	Severe Thunderstorm Warning	OAX	Harrison, Monona	31 min
Apr 22, 7:06 PM CDT	Tornado Warning	GID	Adams	24 min
Apr 22, 7:14 PM CDT	Severe Thunderstorm Warning	OAX	Saunders	31 min
Apr 22, 7:30 PM CDT	Tornado Warning	OAX	Saunders	30 min
Apr 22, 7:54 PM CDT	Tornado Warning	OAX	Washington	36 min
Apr 22, 7:59 PM CDT	Severe Thunderstorm Warning	FSD	Buena Vista, Ida	31 min
Apr 22, 8:05 PM CDT	Tornado Warning	OAX	Burt	25 min
Apr 22, 8:26 PM CDT	Tornado Warning	OAX	Monona	34 min
Apr 22, 8:41 PM CDT	Severe Thunderstorm Warning	FSD	Woodbury	34 min

The nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 8.8 hours before the alert went out and 89 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: 3 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 431 m above ground
0-6 km bulk shear: 55 kt
0-1 km storm-relative helicity: 75 m²/s²
0-3 km storm-relative helicity: 222 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.1

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WWUS9 KMKC 222031
SEL2  

SEL2  
MKC WW 222025
IAZ000-NEZ000-230200-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 172
STORM PREDICTION CENTER NORMAN OK
325 PM CDT SUN APR 22 2001

THE STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF

   WESTERN IOWA                               
   CENTRAL AND EASTERN NEBRASKA                           

EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 345 PM UNTIL 900
PM CDT.

TORNADOES...HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS
TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE TORNADO WATCH AREA IS ALONG AND 85 STATUTE MILES EAST AND WEST
OF A LINE FROM 45 MILES SOUTH SOUTHEAST OF HASTINGS NEBRASKA TO 50
MILES EAST NORTHEAST OF SIOUX CITY IOWA.

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 169...WW 170...WW 171...

DISCUSSION...SEVERE THUNDERSTORMS...INCLUDING SUPERCELLS...EXPECTED
TO DEVELOP/SPREAD NEWD ALONG INTENSIFYING SURFACE FRONT STALLING
NE/SW ACROSS REGION.  DEEP LAYER SHEAR/LARGE SCALE ASCENT WILL
CONTINUE TO INCREASE THROUGH THIS EVENING...ENHANCING POTENTIAL FOR 
CLUSTERS/BANDS OF STORMS WITH SMALL SCALE BOWS/ISOLATED TORNADOES. 

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2 INCHES.  EXTREME TURBULENCE AND SURFACE WIND
GUSTS TO 60 KNOTS.  A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450. 
MEAN STORM MOTION VECTOR 21050.

...CORFIDI4

;423,0934 395,0963 395,0994 423,0970;

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 22, 12:00 PM CDT	Tornado Watch	SPC	Adams, Clay, Fillmore, Franklin, Frontier, Furnas and 8 more	5 hr

Nearby

Tornado Watches in Nebraska, 2001 Tornado Watches in Iowa, 2001 Every 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.