A fast moving upper level disturbance across northern Wyoming produced a brief period of high winds across portions of south central Wyoming.
Every event with a place to put it; 7 filed by county or forecast zone are drawn at its center, in a lighter ring. Tap one for its entry below.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS CYS wrote it up.
A fast moving upper level disturbance across northern Wyoming produced a brief period of high winds across portions of south central Wyoming.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Cheyenne, WY wrote its last area forecast discussion before the first event at Nov 15, 10:15 PM MST, 3 hours earlier.
Area Forecast Discussion
National Weather Service Cheyenne WY
1015 PM MST Wed Nov 15 2017
.SHORT TERM...(This evening through Thursday)
Issued at 248 PM MST Wed Nov 15 2017
Dry and mild conditions expected to prevail over the CWA this
period. Attention will be focused on some strong winds which look
likely around the Arlington area later tonight through Thursday...
expanding into possible western Converse county by Thursday
afternoon as lee troughing develops along the Laramie Range in
response to a shortwave ejecting ENE across the northern Rockys
into Canada. Pattern not favorable for the Bordeaux area due to
the expected nearness of the sfc trough. Stronger mid-level winds
also farther north with high wind threat looking lower for
northern Carbon county so opted to drop that area from the high
wind watch, but still some gusty winds expected during the day in
that area.
.LONG TERM...(Thursday night through Wednesday)
Issued at 248 PM MST Wed Nov 15 2017
Main focus this period will be late Thursday night through most of
Friday with a pretty good snowfall event expected over the higher
mtns. An upper trough will move into the Pacific northwest
Thursday evening and sweep east and across the area Friday
evening. Moisture will increase ahead of this system and ride up
the west-facing slopes of the Sierra Madre/Snowy Ranges later
Thursday night and continue on Friday producing some good snows.
Should see in the neighborhood of a foot of snow there before the
upper trough swings across early Friday evening bringing snow to
an end. Will keep the Winter Storm Watch going but trimmed it a
bit due to the expected ending of snow early Friday evening.
Other concern will be for a potential Bora event for a time late
Friday afternoon and evening as a cold front sweep across the CWA.
NAM depicting some 40-50kt winds with some downward omega
spreading into the far se Wy plains so will have to watch.
Saturday looking breezy and cool. Milder and dry weather returns
Sunday into early next week but may have some strong winds in
favored areas later Monday as lee troughing deepens over the high
plains. Next cold front due about Wednesday.
&&
.AVIATION...(For the 06Z TAFS through 06Z Thursday evening)
Issued at 1015 PM MST Wed Nov 15 2017
VFR. SCT high clouds tonight, increasing and lowering Thursday.
Strong southwest surface winds and mountain wave turbulence will
impact aviation operations along and west of the Laramie Range
through Thursday. Gusts of 35-45 KT are forecast for terminals west
of the Laramie range, and 20-30 KT to the east. Introduced VCNTY SHRA
and 5000 FT CIGS at Rawlins Thursday evening ahead of cold front.
&&
.FIRE WEATHER...
Issued at 248 PM MST Wed Nov 15 2017
Fire weather concerns expected to be low for the rest of the week
through the weekend as a trend towards cooler temperatures sets in
and keeps weather factors mostly non-critical. The will be some
stronger winds Thursday around the mtns then a cold front will
sweep across the area later Thursday with a period of gusty winds
behind it. Snow will fall mainly over the mtns Thursday night and
Friday.
&&
.CYS WATCHES/WARNINGS/ADVISORIES...
WY...Winter Storm Watch from Thursday evening through Friday
afternoon for WYZ112-114.
High Wind Warning from midnight tonight to 6 PM MST Thursday for
WYZ110.
High Wind Watch from Thursday morning through Thursday afternoon
for WYZ101.
NE...None.
&&
SHORT TERM...RE
LONG TERM...RE
AVIATION...MAJ
FIRE WEATHER...REHazardous Weather Outlook National Weather Service Cheyenne WY 542 PM MST Wed Nov 15 2017 WYZ101>119-170045- Converse County Lower Elevations-Niobrara County- North Laramie Range-Ferris/Seminoe/Shirley Mountains- Shirley Basin-Central Laramie Range and Southwest Platte County- East Platte County-Goshen County-Central Carbon County- North Snowy Range Foothills-Southwest Carbon County- Sierra Madre Range-Upper North Platte River Basin-Snowy Range- Laramie Valley-South Laramie Range-South Laramie Range Foothills- Central Laramie County-East Laramie County- 542 PM MST Wed Nov 15 2017 This hazardous weather outlook is for portions of east central Wyoming...south central Wyoming and southeast Wyoming. .DAY ONE...TONIGHT Southwest winds will increase later tonight, especially for the wind prone areas along Interstate 80 between Laramie and Rawlins. Gusts of 45 to 55 mph are expected. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY Strong southwest winds wil occur Thursday as a cold front approaches from the northwest. Wind gusts in excess of 60 mph are expected along and west of a line from Douglas to Arlington to Rawlins Thursday. This will create an increased blowoff and blowover risk for lightweight and high profile vehicles on Interstate 80 from Rawlins to Laramie and Interstate 25 from Douglas to Casper Thursday. High Wind Watches and Warnings are in effect for these locations Thursday. As the cold front moves through Carbon and Albany counties Thursday evening, heavy snow and blowing and drifting snow will develop across the Snowy and Sierra Madre Ranges. A Winter Storm Watch is in effect for the Snowy and Sierra Madre Ranges Thursday night through Friday night. .Spotter information statement... Spotter activation will not be required at this time. NEZ002-003-019>021-054-055-095-096-170045- Dawes-Box Butte-Scotts Bluff-Banner-Morrill-Kimball-Cheyenne- North Sioux-South Sioux- 542 PM MST Wed Nov 15 2017 This hazardous weather outlook is for portions of western Nebraska. .DAY ONE...TONIGHT No hazardous weather is expected at this time. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY The probability for widespread hazardous weather is low. .Spotter information statement... Spotter activation will not be required at this time.
The national radar mosaic for the moment the first event began.
7 high wind. Local standard time, as filed.
The wind sensor at the Elk Mountain Airport measured a peak gust of 59 mph.
The WYDOT sensor at Elk Mountain measured peak wind gusts of 58 mph.
The WYDOT sensor at Cooper Cove measured sustained winds of 40 mph or higher, with a peak gust of 60 mph at 16/0425 MST.
A RAWS sensor near Muddy Gap measured wind gusts of 58 mph or higher, with a peak gust of 63 mph at 16/1050 MST.
The WYDOT sensor at Halleck Ridge measured sustained winds of 40 mph or higher.
The WYDOT sensor at County Road 402 measured peak wind gusts of 58 mph.
The WYDOT sensor at Dana Ridge measured peak wind gusts of 58 mph.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Wyoming in 2017Every state in 2017This day in weather historyWarnings in Wyoming, November 2017
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 726982, 726981, 726978, 726975, 726983, 726979, 726980.