Alert archive / Nebraska / Tornado Watches in 2004

Tornado Watch 243

May 21, 20048 counties in Kansas; 39 counties in Nebraska; 14 counties in South Dakota

The Storm Prediction Center issued this tornado watch at May 21, 2004, 7:40 PM CDT for 8 counties in Kansas; 39 counties in Nebraska; 14 counties in South Dakota. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
May 21, 2004, 7:40 PM CDT (00:40 UTC)
Expired
May 22, 2004, 1:00 AM CDT
In force
5 hr
Issued by
the Storm Prediction Center
All 61 counties

Cloud County, KS, Jewell County, KS, Mitchell County, KS, Osborne County, KS, Phillips County, KS, Republic County, KS, Rooks County, KS, Smith County, KS, Adams County, NE, Antelope County, NE, Boone County, NE, Boyd County, NE, Buffalo County, NE, Butler County, NE, Cedar County, NE, Clay County, NE, Colfax County, NE, Fillmore County, NE, Franklin County, NE, Garfield County, NE, Greeley County, NE, Hall County, NE, Hamilton County, NE, Harlan County, NE, Holt County, NE, Howard County, NE, Kearney County, NE, Knox County, NE, Loup County, NE, Madison County, NE, Merrick County, NE, Nance County, NE, Nuckolls County, NE, Phelps County, NE, Pierce County, NE, Platte County, NE, Polk County, NE, Rock County, NE, Seward County, NE, Sherman County, NE, Stanton County, NE, Thayer County, NE, Valley County, NE, Wayne County, NE, Webster County, NE, Wheeler County, NE, York County, NE, Aurora County, SD, Bon Homme County, SD, Brule County, SD, Charles Mix County, SD, Clay County, SD, Davison County, SD, Douglas County, SD, Gregory County, SD, Hanson County, SD, Hutchinson County, SD, McCook County, SD, Minnehaha County, SD, Turner County, SD, Yankton County, SD

The radar

The Grand Island radar (KUEX), 91 km from the middle of the area, began a volume at 00:43 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

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

IssuedProductOfficeCountiesLasted
May 21, 7:48 PM CDTTornado WarningOAXKnox, Pierce27 min
May 21, 7:50 PM CDTSevere Thunderstorm WarningFSDClay, Union40 min
May 21, 7:59 PM CDTSevere Thunderstorm WarningGIDOsborne46 min
May 21, 8:02 PM CDTSevere Thunderstorm WarningGIDJewell, Mitchell58 min
May 21, 8:04 PM CDTTornado WarningOAXCedar41 min
May 21, 8:14 PM CDTTornado WarningOAXPierce31 min
May 21, 8:33 PM CDTTornado WarningOAXMadison, Stanton, Wayne42 min
May 21, 8:45 PM CDTTornado WarningOAXPierce30 min
May 21, 8:49 PM CDTSevere Thunderstorm WarningGIDWebster41 min
May 21, 8:57 PM CDTSevere Thunderstorm WarningTOPRepublic48 min
May 21, 8:57 PM CDTTornado WarningLBFLoup, Rock48 min
May 21, 8:59 PM CDTSevere Thunderstorm WarningGIDJewell46 min
May 21, 9:11 PM CDTTornado WarningOAXWayne34 min
May 21, 9:12 PM CDTSevere Thunderstorm WarningFSDClay, Yankton33 min
May 21, 9:16 PM CDTTornado WarningOAXCedar29 min
May 21, 9:19 PM CDTSevere Thunderstorm WarningGIDClay, Nuckolls61 min
May 21, 9:22 PM CDTTornado WarningFSDClay, Yankton23 min
May 21, 9:43 PM CDTTornado WarningOAXCuming, Stanton, Wayne32 min
May 21, 9:44 PM CDTTornado WarningLBFGarfield46 min
May 21, 9:45 PM CDTSevere Thunderstorm WarningTOPRepublic60 min
May 21, 9:47 PM CDTTornado WarningFSDClay, Union28 min
May 21, 10:15 PM CDTTornado WarningOAXCuming, Wayne45 min
May 21, 10:18 PM CDTTornado WarningLBFWheeler42 min
May 21, 10:26 PM CDTSevere Thunderstorm WarningGIDFranklin49 min
May 21, 10:28 PM CDTSevere Thunderstorm WarningFSDTurner32 min
May 21, 10:42 PM CDTSevere Thunderstorm WarningGIDAdams63 min
May 21, 10:45 PM CDTSevere Thunderstorm WarningOAXCedar45 min
May 21, 10:49 PM CDTSevere Thunderstorm WarningOAXPierce41 min
May 21, 10:52 PM CDTSevere Thunderstorm WarningOAXWayne23 min
May 21, 10:53 PM CDTSevere Thunderstorm WarningOAXBoone37 min
May 21, 10:54 PM CDTSevere Thunderstorm WarningGIDGreeley66 min
May 21, 11:01 PM CDTSevere Thunderstorm WarningLBFWheeler29 min
May 21, 11:02 PM CDTTornado WarningOAXBoone28 min
May 21, 11:03 PM CDTSevere Thunderstorm WarningGIDKearney57 min
May 21, 11:08 PM CDTSevere Thunderstorm WarningOAXAntelope, Madison52 min
May 21, 11:14 PM CDTSevere Thunderstorm WarningOAXWayne31 min
May 21, 11:24 PM CDTSevere Thunderstorm WarningFSDLincoln, Minnehaha36 min
May 21, 11:30 PM CDTFlash Flood WarningOAXThurston, Wayne6 hr
May 21, 11:31 PM CDTSevere Thunderstorm WarningGIDHall59 min
May 21, 11:35 PM CDTSevere Thunderstorm WarningOAXBoone, Platte40 min
May 22, 12:09 AM CDTSevere Thunderstorm WarningOAXMadison36 min
May 22, 12:13 AM CDTSevere Thunderstorm WarningOAXPlatte47 min
May 22, 12:14 AM CDTSevere Thunderstorm WarningGIDValley46 min
May 22, 12:27 AM CDTSevere Thunderstorm WarningGIDHall, Merrick63 min
May 22, 12:47 AM CDTSevere Thunderstorm WarningGIDHamilton, York58 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 00:00Z, 0.7 hours before the alert went out and 170 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-pSkew-T log-p diagram, N. Platte/Lee Bi, NE at 00:00Z on 2004-05-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2197 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, N. Platte/Lee Bi, NE at 00:00Z on 2004-05-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 99 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
2197 J/kg
Mixed-layer CIN
-41 J/kg
Mixed-layer LCL
1985 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
99 m²/s²
0-3 km storm-relative helicity
266 m²/s²
Significant tornado parameter
0.0
Supercell composite
19.7

Open this sounding in Storm Lab

The text

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

000 
WWUS20 KWNS 220039
SEL3  
SPC WW 220040
KSZ000-NEZ000-SDZ000-220600-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 243
NWS STORM PREDICTION CENTER NORMAN OK
740 PM CDT FRI MAY 21 2004

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

       NORTH CENTRAL KANSAS
       CENTRAL AND EASTERN NEBRASKA
       SOUTHEAST SOUTH DAKOTA

EFFECTIVE THIS FRIDAY NIGHT AND SATURDAY MORNING FROM 740 PM UNTIL
100 AM CDT.

TORNADOES...HAIL TO 3 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS
TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE TORNADO WATCH AREA IS ALONG AND 65 STATUTE MILES EAST AND WEST
OF A LINE FROM 10 MILES NORTH OF MITCHELL SOUTH DAKOTA TO 50 MILES
WEST SOUTHWEST OF CONCORDIA 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 235...WW 236...WW 237...WW
238...WW 239...WW 240...WW 241...WW 242...

DISCUSSION...EXTREMELY UNSTABLE AIR MASS ACROSS ERN HALF OF NE INTO
SERN SD. ADDITIONALLY FAVORABLE VEERING SHEAR PROFILES SUPPORT RAPID
DEVELOPMENT OF SUPERCELL STORMS.  IN ADDITION TO VERY LARGE HAIL
POTENTIAL...ISOLATED TORNADOES ARE LIKELY. STORMS COULD DEVELOP MOST
ANYWHERE IN THE INSTABILITY AXIS THROUGH THE EVENING.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 3 INCHES. EXTREME TURBULENCE AND SURFACE WIND
GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 600.
MEAN STORM MOTION VECTOR 24030.


...HALES

435,0964 391,0971 391,0994 435,0991

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 21, 8:40 PM CDTMesoscale DiscussionSPCClark, Edwards, Ellis, Ford, Gray, Hodgeman and 8 more95 min
May 21, 10:01 PM CDTMesoscale DiscussionSPCCloud, Jewell, Mitchell, Osborne, Phillips, Republic and 2 more89 min
May 22, 1:13 PM CDTMesoscale DiscussionSPCCheyenne2 hr
May 22, 2:00 PM CDTTornado WatchSPCCheyenne, Rawlins, Sherman, Thomas6 hr
May 22, 3:04 PM CDTMesoscale DiscussionSPCCheyenne86 min
May 22, 3:52 PM CDTMesoscale DiscussionSPCBarber, Barton, Clark, Clay, Cloud, Comanche and 20 more83 min
May 22, 5:50 PM CDTTornado WatchSPCBarton, Clay, Cloud, Dickinson, Ellsworth, Geary and 13 more5 hr
May 21, 9:55 PM CDTTornado WatchSPCBurt, Cuming, Dakota, Dixon, Dodge, Thurston and 1 more4 hr
May 22, 12:25 AM CDTMesoscale DiscussionSPCAdams, Antelope, Boone, Buffalo, Burt, Butler and 29 more2 hr
May 22, 12:55 AM CDTSevere Thunderstorm WatchSPCAdams, Boone, Buffalo, Burt, Butler, Cass and 31 more5 hr
May 22, 3:44 AM CDTMesoscale DiscussionSPCAdams, Buffalo, Burt, Butler, Cass, Clay and 20 more61 min
May 22, 3:02 PM CDTMesoscale DiscussionSPCAdams, Butler, Cass, Clay, Douglas, Fillmore and 22 more58 min
May 22, 3:45 PM CDTTornado WatchSPCAdams, Boone, Buffalo, Burt, Butler, Cass and 44 more7 hr

Nearby

Tornado Watches in Nebraska, 2004Tornado Watches in South Dakota, 2004Tornado Watches in Kansas, 2004Every tornado watch in 2004

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.