Alert archive / Nebraska / Severe Thunderstorm Watches in 2000

Severe Thunderstorm Watch 486

June 23, 200013 counties in Nebraska; 9 counties in South Dakota

The Storm Prediction Center issued this severe thunderstorm watch at Jun 23, 2000, 5:30 PM MDT for 13 counties in Nebraska; 9 counties in South Dakota. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued: Jun 23, 2000, 5:30 PM MDT (23:30 UTC)
Expired: Jun 23, 2000, 10:00 PM MDT
In force: 5 hr
Issued by: the Storm Prediction Center

All 22 counties

Arthur County, NE, Banner County, NE, Box Butte County, NE, Cheyenne County, NE, Dawes County, NE, Deuel County, NE, Garden County, NE, Grant County, NE, Keith County, NE, Morrill County, NE, Scotts Bluff County, NE, Sheridan County, NE, Sioux County, NE, Butte County, SD, Custer County, SD, Fall River County, SD, Harding County, SD, Lawrence County, SD, Meade County, SD, Oglala Lakota County, SD, Pennington County, SD, Perkins County, SD

The radar

The Rapid City radar (KUDX), 39 km from the middle of the area, began a volume at 23:32 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

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

Issued	Product	Office	Counties	Lasted
Jun 23, 5:39 PM MDT	Severe Thunderstorm Warning	UNR	Butte	61 min
Jun 23, 6:16 PM MDT	Severe Thunderstorm Warning	UNR	Butte	44 min
Jun 23, 6:39 PM MDT	Severe Thunderstorm Warning	LBF	Sheridan	66 min
Jun 23, 6:57 PM MDT	Severe Thunderstorm Warning	UNR	Butte, Lawrence, Meade	63 min
Jun 23, 7:39 PM MDT	Severe Thunderstorm Warning	LBF	Arthur	51 min
Jun 23, 7:56 PM MDT	Severe Thunderstorm Warning	UNR	Lawrence, Meade, Pennington	59 min
Jun 23, 8:46 PM MDT	Severe Thunderstorm Warning	UNR	Meade, Pennington	54 min
Jun 23, 9:35 PM MDT	Severe Thunderstorm Warning	UNR	Pennington	30 min

The nearest sounding before it

Rapid City, SD (KUNR), launched 12:00Z, 11.5 hours before the alert went out and 32 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1632 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: -42 m²/s²
0-3 km storm-relative helicity: 91 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

310 
WWUS9 KMKC 232313
SEL6  
MKC WW 232308
NEZ000-SDZ000-240400-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 486
STORM PREDICTION CENTER NORMAN OK
508 PM MDT FRI JUN 23 2000

THE STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

   WESTERN NEBRASKA                           
   WESTERN SOUTH DAKOTA                       

EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 530 PM UNTIL 1000
PM MDT.

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

THE SEVERE THUNDERSTORM WATCH AREA IS ALONG AND 55 STATUTE MILES
EAST AND WEST OF A LINE FROM 40 MILES NORTHEAST OF REDIG SOUTH
DAKOTA TO 20 MILES EAST SOUTHEAST OF SIDNEY NEBRASKA.

REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
FAVORABLE FOR 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 482...WW 483...WW
484...WW 485...

DISCUSSION...CLUSTERS OF STRONG THUNDERSTORMS HAVE DEVELOPED FROM
EXTREME SERN MT INTO THE WRN NEB PANHANDLE.  AIR MASS IS MODERATELY
UNSTABLE WITH MUCAPE OF 2000-3000 J/KG...AND DEEP LAYER SHEAR IS
SUFFICIENT FOR SEVERE STORMS INCLUDING ISOLATED SUPERCELLS. 
ACTIVITY SHOULD SPREAD ESEWD THROUGH THE EVENING WITH THREAT FOR
DAMAGING WIND GUSTS AND HAIL.

AVIATION...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 27025.


...WEISS

405,1034 454,1040 454,1014 405,1013

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 23, 4:15 PM MDT	Severe Thunderstorm Watch	SPC	Cass, Douglas, Johnson, Lancaster, Nemaha, Otoe and 3 more	6 hr
Jun 23, 5:00 PM MDT	Severe Thunderstorm Watch	SPC	Adams, Butler, Clay, Dodge, Fillmore, Franklin and 20 more	5 hr

Nearby

Severe Thunderstorm Watches in Nebraska, 2000 Severe Thunderstorm Watches in South Dakota, 2000 Every severe thunderstorm 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; radar from the NEXRAD Level II archive.