Alert archive / Nebraska / Tornado Watches in 1999

Tornado Watch 480

June 27, 19999 counties in Nebraska; 4 counties in South Dakota; 8 counties in Wyoming

The Storm Prediction Center issued this tornado watch at Jun 27, 1999, 2:30 PM MDT for 9 counties in Nebraska; 4 counties in South Dakota; 8 counties in Wyoming. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Jun 27, 1999, 2:30 PM MDT (20:30 UTC)
Expired
Jun 27, 1999, 8:00 PM MDT
In force
6 hr
Issued by
the Storm Prediction Center
All 21 counties

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, Butte County, SD, Custer County, SD, Fall River County, SD, Lawrence County, SD, Campbell County, WY, Converse County, WY, Crook County, WY, Goshen County, WY, Laramie County, WY, Niobrara County, WY, Platte County, WY, Weston County, WY

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Jun 27, 2:59 PM MDTSevere Thunderstorm WarningCYSPlatte36 min
Jun 27, 3:14 PM MDTTornado WarningCYSNiobrara31 min
Jun 27, 3:31 PM MDTSevere Thunderstorm WarningCYSPlatte29 min
Jun 27, 3:34 PM MDTSevere Thunderstorm WarningUNRFall River31 min
Jun 27, 3:37 PM MDTTornado WarningCYSPlatte33 min
Jun 27, 3:51 PM MDTSevere Thunderstorm WarningCYSGoshen49 min
Jun 27, 4:06 PM MDTSevere Thunderstorm WarningUNRFall River34 min
Jun 27, 4:24 PM MDTSevere Thunderstorm WarningUNRCampbell31 min
Jun 27, 4:34 PM MDTTornado WarningCYSGoshen21 min
Jun 27, 4:42 PM MDTTornado WarningCYSScotts Bluff, Sioux33 min
Jun 27, 4:52 PM MDTSevere Thunderstorm WarningUNRCrook, Weston33 min
Jun 27, 5:32 PM MDTSevere Thunderstorm WarningUNRCrook33 min
Jun 27, 5:39 PM MDTTornado WarningCYSScotts Bluff16 min
Jun 27, 5:41 PM MDTSevere Thunderstorm WarningCYSMorrill34 min
Jun 27, 5:58 PM MDTTornado WarningUNRButte, Lawrence32 min
Jun 27, 6:18 PM MDTSevere Thunderstorm WarningUNRButte47 min
Jun 27, 6:24 PM MDTTornado WarningUNRLawrence31 min
Jun 27, 6:27 PM MDTSevere Thunderstorm WarningUNRWeston48 min
Jun 27, 6:40 PM MDTTornado WarningCYSMorrill15 min
Jun 27, 7:15 PM MDTSevere Thunderstorm WarningUNRWeston50 min
Jun 27, 7:55 PM MDTTornado WarningLBFDeuel35 min

The nearest sounding before it

Rapid City, SD (KUNR), launched 12:00Z, 8.5 hours before the alert went out and 121 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 1999-06-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 1999-06-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -11 square meters per square second.1939587897Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1202 m above ground
0-6 km bulk shear
51 kt
0-1 km storm-relative helicity
-11 m²/s²
0-3 km storm-relative helicity
283 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 26, 6:00 PM MDTTornado WatchSPCArthur, Blaine, Chase, Custer, Dawson, Deuel and 16 more6 hr
Jun 26, 10:45 PM MDTSevere Thunderstorm WatchSPCBuffalo, Chase, Custer, Dawson, Deuel, Dundy and 14 more5 hr
Jun 27, 2:15 AM MDTSevere Thunderstorm WatchSPCAdams, Boone, Buffalo, Butler, Cass, Clay and 34 more6 hr
Jun 27, 5:00 AM MDTSevere Thunderstorm WatchSPCRichardson5 hr
Jun 27, 4:30 PM MDTSevere Thunderstorm WatchSPCBlaine, Boyd, Brown, Cherry, Garfield, Grant and 8 more7 hr

Nearby

Tornado Watches in Nebraska, 1999Tornado Watches in Wyoming, 1999Tornado Watches in South Dakota, 1999Every tornado watch in 1999

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.