Alert archive / Wyoming / Severe Thunderstorm Warnings in 1986

Severe Thunderstorm Warning 71, NWS Cheyenne, WY

August 3, 1986Platte County, Wyoming

NWS Cheyenne, WY issued this severe thunderstorm warning at Aug 3, 1986, 5:15 PM MDT for Platte County, Wyoming. It was in force for 40 min.

The area

The counties it named.

The facts

Issued
Aug 3, 1986, 5:15 PM MDT (23:15 UTC)
Expired
Aug 3, 1986, 5:55 PM MDT
In force
40 min
Issued by
NWS Cheyenne, WY
Area
Whole counties

County Platte 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 12:00Z, 11.3 hours before the alert went out and 274 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 1986-08-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 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 1986-08-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 54 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1367 m above ground
0-6 km bulk shear
40 kt
0-1 km storm-relative helicity
54 m²/s²
0-3 km storm-relative helicity
104 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.2

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KCYS 032319
SVRCYS
WYC031-032355-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE CHEYENNE WY
515 PM MDT SUN AUG 3 1986

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING
EFFECTIVE UNTIL 555 PM MDT FOR PEOPLE IN THE FOLLOWING COUNTIES OF

SOUTHEAST WYOMING..NORTHERN PLATTE.

AT 510 PM RADAR INDICATED A SEVERE THUNDERSTORM NEAR THE TOWN OF
GLENDO WYOMING OR ABOUT 100 MILES NORTH OF CHEYENNE.  HAIL UP TO ONE
INCH IN DIAMETER WAS REPORTED IN THE TOWN OF GLENDO AT 510 PM.

PEOPLE IN NORTHERN PLATTE COUNTY WYOMING SHOULD SEEK A REINFORCED
SHELTER AND BE PREPARED FOR LARGE HAIL...DAMAGING WINDS...DEADLY
LIGHTNING AND HEAVY RAINS.  MINOR URBAN FLOODING WILL ALSO OCCUR.

HATTEN

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, Aug 3, 1:48 PM MDT, 3 hours 27 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
145 PM MDT SUN AUG 3 1986

A SEVERE THUNDERSTORM WATCH HAS BEEN ISSUED FOR MUCH OF EASTERN WYOMING
UNTIL 9 PM MDT THIS SUNDAY EVENING. TOWNS INCLUDED IN THIS WATCH ARE
CHEYENNE...WHEATLAND...TORRINGTON....LUSK...AND NEWCASTLE.

AT 130 PM THIS AFTERNOON...WEATHER RADAR INDICATED THAT THUNDERSHOWERS
HAD ALREADY BEGUN TO DEVELOP OVER THE SOUTHEAST CORNER OF WYOMING.
THESE SHOWERS WERE MOVING TOWARD THE SOUTHEAST AT 25 MILES PER HOUR.

MOIST UPSLOPE LOW LEVEL FLOW COMBINED WITH SURFACE HEATING WILL
CONTINUE TO TRIGGER THUNDERSHOWERS THROUGH THIS AFTERNOON AND EVENING.
SOME OF THESE THUNDERSHOWERS WILL CONTAIN LARGE HAIL...DAMAGING WINDS...
AND BRIEF HEAVY RAIN. REMEMBER...LIGHTNING ALSO IS VERY DANGEROUS.

IF YOU SEE THREATENING WEATHER...SEEK SHELTER IMMEDIATELY. PLEASE INFORM
YOUR LOCAL LAW ENFORCEMENT AGENCY OR THE NATIONAL WEATHER SERVICE OF ANY
SEVERE WEATHER AFTER THE DANGER HAS PASSED.

MENTZER
Special weather statement, Aug 3, 2:34 PM MDT, 2 hours 41 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SCOTTSBLUFF NE
230 PM MDT SUN AUG 3 1986

...SEVERE THUNDERSTORMS WATCH IN EFFECT UNTIL 9PM MDT FOR ENTIRE
NEBRASKA PANHANDLE...

AT 230 PM MDT...RADAR INDICATED A STRONG THUNDERSTORM 45 MILES
NORTHWEST OF CHADRON NEBRASKA...NEAR HOT SPRINGS SOUTH DAKOTA...MOVING
SOUTHEAST AT 25 MILES AN HOUR.

THIS STORM WILL MOVE INTO THE NORTHERN PORTIONS OF DAWES AND SHERIDAN
COUNTIES OF THE PANHANDLE AROUND 4PM MDT THIS AFTERNOON.

LOCALLY HEAVY RAIN..STRONG GUSTY WIND AND HAIL ARE POSSIBLE WITH
THIS THUNDERSTORM.

THE SEVERE THUNDERSTORM WATCH NUMBER 463 REMAINS IN EFFECT FOR ALL OF
THE NEBRASKA PANHANDLE UNTIL 9PM MDT SUNDAY EVENING.
PFEIFFER
Special weather statement, Aug 3, 3:44 PM MDT, 1 hour 31 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SCOTTSBLUFF NE
343 PM MDT SUN AUG 3 1986

...SEVERE THUNDERSTORM WATCH IN EFFECT UNTIL 9PM MDT FOR ENTIRE
NEBRASKA PANHANDLE...

AT 340 PM MDT...RADAR INDICATED THUNDERSTORMS DEVELOPING ALONG THE
FRONT RANGE OF THE ROCKIES...FROM NEAR FORT COLLINS COLORADO NORTHWARD
TO EAST OF CASPER AND NEAR NEWCASTLE WYOMING. THESE STORMS WERE MOVING
SLOWLY SOUTHEAST AT 10 TO 15 MILES AN HOUR AND ARE NOT EXPECTED TO
ENTER THE NEBRASKA PANHANDLE UNTIL AFTER 5PM MDT THIS AFTERNOON.

ISOLATED THUNDERSHOWERS IN THE SOUTHERN BLACK HILLS NEAR HOT SPRINGS
SOUTH DAKOTA WERE MOVING TO THE SOUTH AT 10 MILES AN HOUR.

THE SEVERE THUNDERSTORM WATCH NUMBER n463 REMAINS IN EFFECT FOR ALL OF
THE NEBRASKA PANHANDLE UNTIL 9PM MDT SUNDAY EVENING.
PFEIFFER
Special weather statement, Aug 3, 4:40 PM MDT, 35 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SCOTTSBLUFF NE
440 PM MDT SUN AUG 3 1986

...SEVERE THUNDERSTORM WATCH IN EFFECT UNTIL 9PM MDT FOR ENTIRE
NEBRASKA PANHANDLE...

AT 435 PM MDT...THUNDERSTORMS CONTINUED TO DEVELOP ALONG THE FRONT
RANGE OF THE ROCKIES...FROM EAST OF FORT COLLINS COLORADO NORTHWARD TO
DOUGLAS AND NEAR NEWCASTLE WYOMING. THESE STORMS WERE MOVING SLOWLY
SOUTHEAST AT 15 TO 20 MILES AN HOUR AND ARE NOT EXPECTED TO ENTER THE
NEBRASKA PANHANDLE UNTIL AFTER 6PM MDT THIS AFTERNOON.

ISOLATED THUNDERSHOWERS IN THE BLACK HILLS NEAR RAPID CITY SOUTH DAKOTA
WERE MOVING TO THE SOUTH AT 10 MILES AN HOUR. OTHER THUNDERSHOWERS WERE
DEVELOPING ALONG THE PINE RIDGE IN THE NEBRASKA PANHANDLE NEAR CRAWFORD.

THE SEVERE THUNDERSTORM WATCH NUMBER 463 REMAINS IN EFFECT FOR ALL OF
THE NEBRASKA PANHANDLE UNTIL 9PM MDT SUNDAY EVENING.
PFEIFFER

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 2, 6:45 PM MDTSevere Thunderstorm WarningCYSLaramie45 min
Aug 3, 3:05 PM MDTSevere Thunderstorm WarningCYSLaramie25 min
Aug 3, 3:30 PM MDTSevere Thunderstorm WarningCYSLaramie60 min

Nearby

Severe Thunderstorm Warnings in Wyoming, 1986Every 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.