Alert archive / Wyoming / Severe Thunderstorm Warnings in 1990
Severe Thunderstorm Warning 101, NWS Cheyenne, WY
NWS Cheyenne, WY issued this severe thunderstorm warning at Aug 20, 1990, 2:14 PM MDT for Albany County, Wyoming. It was in force for 61 min.
The area
The counties it named.
The facts
- Issued
- Aug 20, 1990, 2:14 PM MDT (20:14 UTC)
- Expired
- Aug 20, 1990, 3:15 PM MDT
- In force
- 61 min
- Issued by
- NWS Cheyenne, WY
- Area
- Whole counties
County Albany 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
Lander/Hunt Fiel, WY (KLND), launched 12:00Z, 8.2 hours before the alert went out and 277 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.
- Mixed-layer CAPE
- 88 J/kg
- Mixed-layer CIN
- -219 J/kg
- Mixed-layer LCL
- 953 m above ground
- 0-6 km bulk shear
- 44 kt
- 0-1 km storm-relative helicity
- -8 m²/s²
- 0-3 km storm-relative helicity
- 233 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000
TTAA00 KCYS 202015 RRA
SVRCYS
WYC001-202115-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE CHEYENNE WY
214 PM MDT MON AUG 20 1990
THE NATIONAL WEATHER SERVICE IN CHEYENNE HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 315 PM MDT
FOR PEOPLE IN THE FOLLOWING COUNTY...
IN SOUTHEAST WYOMING
...NORTHEASTERN ALBANY
RADAR INDICATED A SEVERE THUNDERSTORM 20 MILES EAST OF ROCK RIVER IN
EAST ALBANY COUNTY WYOMING. THIS IS APPROXIMATELY 30 MILES N OF
LARAMIE. RADAR INDICATED HAIL WITH THIS STORM.
THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH YOU SHOULD
PREPARE FOR DAMAGING WIND IN EXCESS OF 55 MPH...LARGE HAIL...AND
DEADLY LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING BUT STAY AWAY FROM WINDOWS.
LAUZEWhat 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 20, 1:03 PM MDT, 1 hour 11 minutes before
WYZ014-201050- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 100 PM MDT MON AUG 20 1990 ...SEVERE THUNDERSTORM WATCH NUMBER 664 IS IN EFFECT UNTIL 800 PM... SUNNY SKIES AND UNSTABLE AIR HAS BROUGHT A THREAT OF SEVERE THUNDER- STORMS TO EAST WYOMING. NO SEVERE WEATHER WAS DETECTED AS OF 100 PM BUT THUNDERSTORMS HAD BEGUN BUILDING ALONG THE LARAMIE RANGE NORTHWARD TO THE BIG HORN MOUNTAINS OF NORTHERN WYOMING. BY AROUND 200 PM THESE THUNDERSTORMS WILL BE STRONG ENOUGH TO PRODUCE SEVERE WEATHER. THEY ARE EXPECTED TO TAKE A MOVEMENT TO THE NORTHEAST AT 25 TO 30 MILES AN HOUR. KEEP A CLOSE EYE ON THE SKY FOR RAPIDLY DEVELOPING THUNDERSTORMS. SEEK INDOOR SHELTER IF THUNDER STORMS APPROACH. REMEMBER...LIGHTNING IS A LEADING KILLER. DO NOT TREAT THESE THUNDERSTORMS LIGHTLY. CAS
Special weather statement, Aug 20, 1:05 PM MDT, 1 hour 9 minutes before
WYZ004>006-011-012-015>017-202030- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 100 PM MDT MON AUG 20 1990 ...SEVERE THUNDERSTORM WATCH NUMBER 664 IS IN EFFECT UNTIL 800 PM... SUNNY SKIES AND UNSTABLE AIR HAS BROUGHT A THREAT OF SEVERE THUNDER- STORMS TO EAST WYOMING. NO SEVERE WEATHER WAS DETECTED AS OF 100 PM BUT THUNDERSTORMS HAD BEGUN BUILDING ALONG THE LARAMIE RANGE NORTHWARD TO THE BIG HORN MOUNTAINS OF NORTHERN WYOMING. BY AROUND 200 PM THESE THUNDERSTORMS WILL BE STRONG ENOUGH TO PRODUCE SEVERE WEATHER. THEY ARE EXPECTED TO TAKE A MOVEMENT TO THE NORTHEAST AT 25 TO 30 MILES AN HOUR. KEEP A CLOSE EYE ON THE SKY FOR RAPIDLY DEVELOPING THUNDERSTORMS. SEEK INDOO R SHELTER IF THUNDERSTORMS APPROACH. REMEMBER...LIGHTNING IS A LEADING KILLER. DO NOT TREAT THESE THUNDERSTORMS LIGHTLY. CAS
Special weather statement, Aug 20, 1:55 PM MDT, 19 minutes before
WYZ015>017-202100- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 155 PM MDT MON AUG 20 1990 ...SEVERAL THUNDERSTORMS HAVE DEVELOPED IN THE LARAMIE AREA... AT 155 PM MDT SEVERAL THUNDERSTORMS CONTINUED TO DEVELOP ALONG THE LARAMIE AND SNOW MOUNTAIN RANGES. THE STRONGEST THUNDERSTORMS WERE NORTH OF INTERSTATE 80 NEAR THE TOWNS OF HANNA...MEDICINE BOW... ALRINGTON...ROCK RIVER AND LARAMIE. NO REPORTS HAVE BEEN RECEIVED CONCERNING THESE STORMS. HOWEVER... THEY COULD LIKELY CONTAIN PEA-ZIZED HAIL...WIND GUSTS TO 45 MPH LOCALLY HEAVY RAIN AND FREQUENT LIGHTNING. THE STORMS WERE MOVING TO THE EAST-NORTHEAST AT 15 TO 20 MPH. THUNDERSTORMS WILL CONTINUE TO INCREASE IN NUpMBER OVER THE NEXT HOUR OR SO. BE PREPARED TO SEEK INDOOR SHELTER. IF DRIVING DO NOT HESTATE TO PULL OVER FOR THE FEW MINUTES THAT IT TAKES FOR THE STORMS TO PASS BY. BE WATCHFUL OF LOCALIZED FLOODING OF SECONDARY HIGHWAYS AND ROADS. CAS
Nearby
Severe Thunderstorm Warnings in Wyoming, 1990Every severe thunderstorm warning in 1990
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.