Alert archive / Nebraska / Tornado Warnings in 1986

Tornado Warning 15, NWS Cheyenne, WY

June 29, 1986Sioux County, Nebraska

NWS Cheyenne, WY issued this tornado warning at Jun 29, 1986, 8:58 PM MDT for Sioux County, Nebraska. It was in force for 32 min. 2 reports came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued: Jun 29, 1986, 8:58 PM MDT (02:58 UTC)
Expired: Jun 29, 1986, 9:30 PM MDT
In force: 32 min
Issued by: NWS Cheyenne, WY
Area: Whole counties

County Sioux County, NE

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

What was reported inside it

Time	Report	Where	Remark
Jun 29, 9:10 PM MDT	Tornado F1	Sioux, NE
Jun 29, 9:20 PM MDT	Hail 1.5	Sioux, NE

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.

The nearest sounding before it

Rapid City, SD (KRAP), launched 00:00Z, 3.0 hours before the alert went out and 190 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: 2168 J/kg
Mixed-layer CIN: -9 J/kg
Mixed-layer LCL: 1204 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: -66 m²/s²
0-3 km storm-relative helicity: -30 m²/s²
Significant tornado parameter: -0.7
Supercell composite: -8.2

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KBFF 300258
TORBFF
NEC165-300330-

BULLETIN - IMMEDIATE BROADCAST REQUESTED/EBS ACTIVATION REQUESTED 
TORNADO WARNING
NATIONAL WEATHER SERVICE SCOTTSBLUFF NE
858 PM MDT SUN JUN 29 1986

THE NATIONAL WEATHER SERVICE HAS ISSUED A TORNADO WARNING 
EFFECTIVE UNTIL 930 PM MDT FOR PEOPLE IN THE FOLLOWING COUNTY OF

PANHANDLE OF NEBRASKA...CENTRAL SIOUX

AT 9PM MDT A TORNADO WAS INDICATED BY RADAR 5 MILES SOUTHWEST OF
THE AGATE FOSSIL BEDS MOVING TO THE NORTHEAST AT 20 MPH.

IF YOU ARE IN THE PATH OF THIS TORNADO..YOU SHOULD GO TO A BASEMENT
SHELTER IF AVAILABLE. OTHERWISE GO TO A CENTRAL INTERIOR ROOM ON THE
LOWEST FLOOR POSSIBLE. CARS AND MOBILE HOMES SHOULD BE ABANDONED FOR
A REINFORCED BUILDING.
&
IN ADDITION TO THE THREAT OF TORNADOES..LARGE HAIL..DANGEROUS
LIGHTNING AND VERY HEAVY RAIN IS LIKELY WITH THIS STORM.

KOSEL

What forecasters said that day

The local office's own words before this tornado warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

In the hours before

Special weather statement, Jun 29, 5:20 PM MDT, 3 hours 38 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE VALENTINE NE
ISSUED BY SCOTTSBLUFF NE
520 PM MDT SUN JUN 29 1986

...A TORNADO WATCH REMAINS IN EFFECT FOR CHERRY COUNTY OF NORTH CENTRAL
NEBRASKA bUNTIL 10PM CDT TONIGHT...

AT 515PM MDT..NO THUNDERSTORMS WERE LOCATED IN CHERRY COUNTY NEBRASKA.
THUNDERSTORMS HAVE DEVELOPED OVER PORTIONS OF SOUTHWEST SOUTH DAKOTA
HOWEVER..THAT COULD MOVE INTO CHERRY COUNTY LATER THIS EVENING.
KOSEL

Special weather statement, Jun 29, 7:37 PM MDT, 1 hour 21 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
737 PM MDT SUN JUN 29 1986

...A SEVERE THUNDERSTORM WARNING CONTINUES FOR GOSHEN COUNTY
IN SOUTHEAST WYOMING UNTIL 745 PM..

AT 730 PM MDT RADAR INDICATED TWO STRONG THUNDERSTORMS IN CENTRAL
GOSHEN COUNTY IN SOUTHEAST WYOMING. ONE STORM WAS IN THE VICINITY
OF TORRINGTON WYOMING. THE OTHER STORM WAS IN WEST CENTRAL
GOSHEN COUNTY. BOTH STORMS WERE MOVING EAST AROUND 30 MPH.

ALTHOUGH NO SEVERE WEATHER HAS BEEN REPORTED WITH THESE STORMS..
AS THEY PASS THROUGH RURAL WYOMING..THEY ARE CAPABLE OF PRODUCING
LARGE HAIL AND DAMAGING WINDS. RESIDENTS SHOULD BE PREPARED TO
TAKE COVER WHEN THREATENING WEATHER APPROACHES.

RIZZO

Special weather statement, Jun 29, 7:49 PM MDT, 1 hour 9 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SCOTTSBLUFF NE
745PM MDT SUN JUN 29 1986

THUNDERSTORMS HAVE DEVELOPED IN EASTERN WYOMING BETWEEN TORRINGTON..
WHEATLAND..AND GUERNSEY. THIS SMALL AREA OF STORMS IS 28 TO 45 MILES
WEST AND NORTHWEST OF SCOTSBLUFF NEBRASKA AND MOVING TO THE EAST AT
20 MILES AN HOUR.

BRIEF HEAVY RAIN..STRONG GUSTY WIND AND SMALL HAIL IS POSSIBLE ACROSS
SOUTHERN SIOUX AND MOST OF SCOTTS BLUFF COUNTY UNTIL J930 PM MDT THIS
EVENING.
PFEIFFER

Special weather statement, Jun 29, 7:54 PM MDT, 1 hour 4 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
748 PM MDT SUN JUN 29 1986

...SEVERE THUNDERSTORM WARNING EXPIRES FOR GOSHEN COUNTY
IN SOUTHEAST WYOMING...

THE SEVERE THUNDERSTORM WARNING FOR GOSHEN COUNTY HAS EXPIRED.
SCATTERED THUNDERSTORMS CONTINUE IN GOSHEN COUNTY..BUT THE INTENSITY
OF THE STORMS HAS DIMINISHED. NO SEVERE WEATHER WAS REPORTED WITH
THESE STORMS. SCATTERED THUNDERSTORMS ARE EXPECTED TO CONTINUE
EARLY TONIGHT. RESIDENTS CAN STILL EXPECT BRIEF HEAVY RAIN..POSSIBLE
GUSTY WINDS AND SMALL HAIL WITH THESE THUNDERSTORMS.

RIZZO

Special weather statement, Jun 29, 8:30 PM MDT, 28 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
815 PM MDT SUN JUN 29 1986

...A SEVERE THUNDERSTORM WARNING CONTINUES FOR NORTHERN GOSHEN
COUNTY IN SOUTHEAST WYOMING UNTIL 830 PM..

AT 805 PM MDT RADAR INDICATED A STRONG THUNDERSTORM  IN CENTRAL
GOSHEN COUNTY IN SOUTHEAST WYOMING. THE STORM WAS CENTERED OVER
AN AREA JUST EAST OF GUERNSEY WYOMING THROUGH TORRINGTON WYOMING.
THE STORM WAS MOVING SLOWLY NORTHEAST AT AROUND 10 MILES AN HOUR.

ALTHOUGH NO SEVERE WEATHER HAS BEEN REPORTED WITH THIS STORM YET..
THEY ARE CAPABLE OF PRODUCING LARGE HAIL AND DAMAGING WEATHER.
RESIDENTS SHOULD BE PREPARED TO TAKE COVER WHEN THREATENING WEATHER
APPROACHES.

MICKELSON

Special weather statement, Jun 29, 8:51 PM MDT, 7 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
850 PM MDT SUN JUN 29 1986

...SEVERE THUNDERSTORM WATCH NUMBER 318 IS CANCELLED FOR
SHERIDAN...JOHNSON..AND CONVERSE COUNTIES...

...SEVERE THUNDERSTORM WATCH NUMBER 318 CONTINUES UNTIL 10 PM FOR
CAMPBELL...CROOK...WESTON AND NIOBRARA COUNTIES IN NORTHEAST WYOMING..

AT 850 PM THE POTENTIAL FOR SEVERE THUNDERSTORMS IS CONCENTRATED IN
EXTREME NORTHEAST WYOMING...THEREFORE THE SEVERE THUNDERSTORM WATCH
HAS BEEN CANCELLED FOR THE WESTERN PORTION OF THE SEVERE THUNDERSTORM
WATCH IN WYOMING.

RIZZO

The office that day

Everything else NWS Cheyenne, WY issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 29, 8:21 PM MDT	Severe Thunderstorm Warning	CYS	Sioux	54 min
Jun 29, 8:34 PM MDT	Tornado Warning	CYS	Sioux	26 min
Jun 29, 9:26 PM MDT	Severe Thunderstorm Warning	CYS	Box Butte, Dawes, Sioux	54 min
Jun 29, 10:24 PM MDT	Severe Thunderstorm Warning	CYS	Dawes, Sioux	51 min
Jun 30, 4:31 AM MDT	Severe Thunderstorm Warning	CYS	Dawes	59 min
Jun 30, 5:28 AM MDT	Severe Thunderstorm Warning	CYS	Sheridan	57 min
Jun 30, 4:44 PM MDT	Severe Thunderstorm Warning	CYS	Sioux	51 min
Jun 30, 5:10 PM MDT	Severe Thunderstorm Warning	CYS	Dawes, Sheridan	55 min

Nearby

Tornado Warnings in Nebraska, 1986 Every tornado warning in 1986 Tornadoes in 1986

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.