Alert archive / Nebraska / Tornado Watches in 2000

Tornado Watch 606

July 21, 20004 states

The Storm Prediction Center issued this tornado watch at Jul 21, 2000, 2:15 PM MDT for 4 states. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued
Jul 21, 2000, 2:15 PM MDT (20:15 UTC)
Expired
Jul 21, 2000, 9:00 PM MDT
In force
7 hr
Issued by
the Storm Prediction Center
All 23 counties

Logan County, CO, Morgan County, CO, Phillips County, CO, Sedgwick County, CO, Weld County, CO, Yuma County, CO, Banner County, NE, Box Butte County, NE, Cheyenne County, NE, Dawes County, NE, Deuel County, NE, Kimball County, NE, Morrill County, NE, Scotts Bluff County, NE, Sioux County, NE, Custer County, SD, Fall River County, SD, Converse County, WY, Goshen County, WY, Laramie County, WY, Niobrara County, WY, Platte County, WY, Weston County, WY

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Jul 21, 2:28 PM MDTSevere Thunderstorm WarningCYSDawes, Sioux47 min
Jul 21, 3:10 PM MDTSevere Thunderstorm WarningCYSLaramie50 min
Jul 21, 3:31 PM MDTSevere Thunderstorm WarningCYSKimball29 min
Jul 21, 3:58 PM MDTSevere Thunderstorm WarningCYSKimball32 min
Jul 21, 4:57 PM MDTSevere Thunderstorm WarningCYSKimball48 min
Jul 21, 4:59 PM MDTSevere Thunderstorm WarningCYSBox Butte, Morrill16 min
Jul 21, 5:00 PM MDTSevere Thunderstorm WarningUNRFall River45 min
Jul 21, 5:15 PM MDTSevere Thunderstorm WarningCYSBox Butte, Morrill30 min
Jul 21, 5:17 PM MDTSevere Thunderstorm WarningGLDYuma58 min
Jul 21, 5:23 PM MDTTornado WarningBOUWeld37 min
Jul 21, 5:43 PM MDTSevere Thunderstorm WarningCYSMorrill32 min
Jul 21, 5:52 PM MDTTornado WarningGLDYuma38 min
Jul 21, 6:01 PM MDTTornado WarningBOUMorgan, Weld44 min
Jul 21, 6:09 PM MDTSevere Thunderstorm WarningCYSMorrill36 min
Jul 21, 6:27 PM MDTTornado WarningBOUMorgan, Weld48 min
Jul 21, 6:29 PM MDTTornado WarningGLDYuma46 min
Jul 21, 6:33 PM MDTSevere Thunderstorm WarningCYSCheyenne27 min
Jul 21, 6:58 PM MDTSevere Thunderstorm WarningLBFDeuel47 min
Jul 21, 7:04 PM MDTSevere Thunderstorm WarningBOUAdams, Morgan41 min
Jul 21, 7:14 PM MDTSevere Thunderstorm WarningGLDYuma31 min
Jul 21, 7:21 PM MDTSevere Thunderstorm WarningBOUSedgwick39 min
Jul 21, 7:51 PM MDTSevere Thunderstorm WarningBOUPhillips, Sedgwick39 min

The nearest sounding before it

Rapid City, SD (KUNR), launched 12:00Z, 8.3 hours before the alert went out and 225 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, Rapid City, SD at 12:00Z on 2000-07-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 131 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, Rapid City, SD at 12:00Z on 2000-07-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 78 square meters per square second.193958Sfc1 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
131 J/kg
Mixed-layer CIN
-210 J/kg
Mixed-layer LCL
1456 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
78 m²/s²
0-3 km storm-relative helicity
124 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

Open this sounding in Storm Lab

The text

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

905 
WWUS9 KMKC 212010
SEL6  
MKC WW 212000
COZ000-NEZ000-SDZ000-WYZ000-220300-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 606
STORM PREDICTION CENTER NORMAN OK
200 PM MDT FRI JUL 21 2000

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

   NORTHEAST COLORADO                           
   WESTERN NEBRASKA                           
   SOUTHWEST SOUTH DAKOTA                       
   EASTERN WYOMING                            

EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 215 PM UNTIL 900
PM MDT.

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 70 STATUTE MILES EAST AND WEST
OF A LINE FROM 85 MILES NORTH NORTHEAST OF DOUGLAS WYOMING TO 20
MILES SOUTHEAST OF AKRON COLORADO.

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 605...

DISCUSSION...SCATTERED THUNDERSTORMS...INCLUDING SUPERCELLS...
EXPECTED TO STRENGTHEN OVER ERN WY/FAR WRN NEB THROUGH THE
AFTERNOON...WITH OTHER STORMS POSSIBLY FORMING SOMEWHAT LATER SWD
INTO CO.  STEEP MID LEVEL LAPSE RATES/AMPLE BOUNDARY LAYER MOISTURE
INFLOW AND MODERATE DIRECTIONAL SHEAR APPEAR SUPPORTIVE OF VERY
LARGE HAIL/HIGH WINDS AND ISOLATED TORNADOES.  

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 550. 
MEAN STORM MOTION VECTOR 31025.

...CORFIDI

435,1030 395,1013 395,1041 435,1055

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 21, 4:15 PM MDTTornado WatchSPCBaca, Bent, Cheyenne, Kiowa, Kit Carson, Lincoln and 1 more6 hr
Jul 21, 2:00 PM MDTSevere Thunderstorm WatchSPCAdams, Arthur, Blaine, Brown, Buffalo, Chase and 30 more6 hr

Nearby

Tornado Watches in Nebraska, 2000Tornado Watches in Colorado, 2000Tornado Watches in Wyoming, 2000Every tornado watch in 2000

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.