Alert archive / Wyoming / Severe Thunderstorm Warnings in 1986

Severe Thunderstorm Warning 41, NWS Cheyenne, WY

June 30, 1986Weston County, Wyoming

NWS Cheyenne, WY issued this severe thunderstorm warning at Jun 30, 1986, 12:01 AM MDT for Weston County, Wyoming. It was in force for 44 min.

The area

The counties it named.

The facts

Issued: Jun 30, 1986, 12:01 AM MDT (06:01 UTC)
Expired: Jun 30, 1986, 12:45 AM MDT
In force: 44 min
Issued by: NWS Cheyenne, WY
Area: Whole counties

County Weston County, WY

The radar

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

The nearest sounding before it

Rapid City, SD (KRAP), launched 00:00Z, 6.0 hours before the alert went out and 137 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 KCYS 300602
SVRCYS
WYC045-300645-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE CHEYENNE WY
1201 AM MDT MON JUN 30 1986

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING
EFFECTIVE UNTIL 1245 AM MDT FOR PEOPLE IN THE FOLLOWING COUNTY OF

NORTHEAST WYOMING..WESTON

AT MIDNIGHT RADAR INDICATED A SEVERE THUNDERSTORM 20 MILES WEST
OF NEWCASTLE WYOMING. THIS STORM WAS MOVING NORTHEAST AT 20 MILES
AN HOUR.

PEOPLE IN THE PATH OF THIS THUNDERSTORM SHOULD SEEK A REINFORCED
SHELTER IMMEDIATELY.  THIS STORM WILL PRODUCE STRONG DAMAGING WIND..
LARGE HAIL..HEAVY RAIN..AND DANGEROUS LIGHTNING.
RIZZO

What forecasters said that day

The local office's own words before this severe thunderstorm 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, 9:27 PM MDT, 2 hours 34 minutes before

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

...SEVERE THUNDERSTORM WATCH NUMBER 318 FOR NORTHEAST WYOMING
   HAS BEEN CANCELLED...

THUNDERSTORM ACTIVITY WAS BEGINNING TO DECREASE IN INTENSITY IN WYOMING.
HOWEVER...AT 920 PM RADAR INDICATED A STRONG THUNDERSTORM IN NORTH
CENTRAL GOSHEN COUNTY ABOUT 55 MILES NORTHWEST OF SCOTTSBLUFF NEBRASKA.
THIS STORM WAS MOVING TO THE NORTHEAST AT 20 MILES AN HOUR.

RESIDENTS OF NORTHERN GOSHEN COUNTY SHOULD BE WATCHFUL AS THIS STORM
MOVES TO THE EAST.  SMALL HAIL...STRONG GUSTY WINDS...AND DANGEROUS
LIGHTNING ARE ALL POSSIBLE.  IF ANY SEVERE WEATHER IS SPOTTED...TAKE
COVER...AND WHEN SAFE NOTIFY YOUR C5OUNTY SHERIFF.
GLANCY

Local storm report, Jun 29, 9:51 PM MDT, 2 hours 10 minutes before

STORM REPORT
NATIONAL WEATHER SERVICE CHEYENNE WY
945 PM MDT SUN JUNE 30 1985

ALL TIMES MOUNTAIN DAYLIGHT TIME..

858 PM... PATROL CAR DRIVING BACK FROM 25 MILES NORTH OF TORRINGTON
          IN GOSHENA COUNTY IN SOUTHEAST WY..BROUGHT BACK EGG AND
          BASEBALL SIZE HAIL TO TORRINGTION PD OFFICE ...APPROXIMATE
          TIME OF OCCURANCE 815 TO 830 PM MDT

RIZZO

Special weather statement, Jun 29, 10:17 PM MDT, 1 hour 44 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SCOTTSBLUFF NE
1015PM MDT SUN JUN 29 1986

...SEVERE THUNDERSTORM WARNING CANCELLED FOR NORTHERN NEBRASKA
   PANHANDLE...

THE SEVERE THUNDERSTORM WARNING ISSUED AT 920 PM MDT FOR NORTHERN
SIOUX...WESTERN DAWES...AND NORTHWEST BOX BUTTE COUNTIES IN THE
NORTHERN NEBRASKA PANHANDLE HAS BEEN CANCELLED.

THE THUNDERSTORMS WHICH PROMPTED THE WARNING HAVE WEAKENED GREATLY
AND ARE NO LONGER A THREAT TO THE AREA.

AT 1010 PM MDT...RADAR INDICATES A STRONG THUNDERSTORM 8 MILES WEST
OF HARRISON NEBRASKA ALONG THE NEBRASKA/WYOMING STATELINE MOVING
NORTHEAST AT 20 MILES AN HOUR. HEAVY RAIN AND HAIL ARE POSSIBLE WITH
THIS STORM AS IT MOVES NORTH OF HARRISON TOWARDS THE SOUTH DAKOTA LINE.
PFEIFFER

Special weather statement, Jun 29, 10:42 PM MDT, 1 hour 19 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SCOTTSBLUFF NE
1040PM MDT SUN JUN 29 1986

...SEVERE THUNDERSTORM WARNING CANCELLED FOR SIOUX AND DAWES COUNTIES...

THE SEVERE THUNDERSTORM WARNING ISSUED AT 1024 PM MDT FOR NORTHERN SIOUX
AND NORTHWEST DAWES COUNTIES OF THE NEBRASKA PANHANDLE HAS BEEN
CANCELLED.

THE THUNDERSTORM WHICH PROMPTED THE WARNING HAS WEAKENED GREATLY
AND IS NO LONGER A THREAT TO THE AREA.

AT 1040 PM MDT...RADAR INDICATES A THUNDERSTORM 25 MILES WEST OF
CHADRON NEBRASKA IN NORTHEASTERN SIOUX COUNTY MOVING NORTHEAST AT
20 MILES AN HOUR. LOCALLY HEAVY RAIN AND SMALL HAIL ARE STILL POSSIBLE
WITH THIS STORM AS IT MOVES TOWARD THE SOUTH DAKOTA LINE.
PFEIFFER

Local storm report, Jun 29, 11:30 PM MDT, 31 minutes before

STORM REPORT
NATIONAL WEATHER SERVICE SCOTTSBLUFF NE
1130 PM MDT SUN JUN 29 1986

SELS MKC OMA A BFF

TIME          EVENT
2 45 PM MDT   BRIEF HEAVY RAIN BUT NO WIND OR HAIL AT KIMBALL NEBRASKA
              FROM CIVIL DEFENSE DIR.

5 40 PM MDT   WIND GUSTS TO 53 MPH AT WSMO ALLIANCE. NO THUNDER.

9 10 PM MDT   TORNADO REPORTED BY PUBLIC 20 MILES NORTH OF SCOTTSBLUFF
              NEBRASKA IN SIOUX COUNTY.

9 20 PM MDT   GOLFBALL SIZE HAIL 7 MILES SOUTH OF HARRISON NEBRASKA IN
              SIOUX COUNTY. KNOCKED OUT WINDSHIELD OF SPOTTER'S CAR.

11 05 PM MDT  HOUSE STRUCK BY LIGHTNING IN CHADRON NEBRASKA CAUSED A
              COMPLETE POWER LOSS...IN DAWES COUNTY.
<
KOSEL/PFEIFFER

Local storm report, Jun 29, 11:35 PM MDT, 26 minutes before

STORM REPORT
NATIONAL WEATHER SERVICE SCOTTSBLUFF NE
1130 PM MDT SUN JUN 29 1986

SELS MKC OMA A BFF

TIME          EVENT
2 45 PM MDT   BRIEF HEAVY RAIN BUT NO WIND OR HAIL AT KIMBALL NEBRASKA
              FROM CIVIL DEFENSE DIR.

5 40 PM MDT   WIND GUSTS TO 53 MPH AT WSMO ALLIANCE. NO THUNDER.

9 10 PM MDT   TORNADO REPORTED BY PUBLIC 20 MILES NORTH OF SCOTTSBLUFF
              NEBRASKA IN SIOUX COUNTY.

9 20 PM MDT   GOLFBALL SIZE HAIL 7 MILES SOUTH OF HARRISON NEBRASKA IN
              SIOUX COUNTY. KNOCKED OUT WINDSHIELD OF SPOTTER'S CAR.

11 05 PM MDT  HOUSE STRUCK BY LIGHTNING IN CHADRON NEBRASKA CAUSED A
              COMPLETE POWER LOSS...IN DAWES COUNTY.
<
KOSEL/PFEIFFER

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 29, 7:15 PM MDT	Severe Thunderstorm Warning	CYS	Goshen	30 min
Jun 29, 8:06 PM MDT	Severe Thunderstorm Warning	CYS	Goshen	24 min
Jun 30, 12:50 AM MDT	Severe Thunderstorm Warning	CYS	Weston	40 min

Nearby

Severe Thunderstorm Warnings in Wyoming, 1986 Every severe thunderstorm warning 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; the sounding from the Mesonet's radiosonde archive.