Strong winds were reported over the I-80 Summit and near Arlington 20 November.
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The episode as NWS CYS wrote it up.
Strong winds were reported over the I-80 Summit and near Arlington 20 November.
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 19, 10:35 PM MST, 3 hours 11 minutes earlier. Its key messages:
Area Forecast Discussion National Weather Service Cheyenne WY 1035 PM MST Tue Nov 19 2024 .KEY MESSAGES... - High Wind Warnings remain in effect until 5 PM this afternoon for Dawes County Nebraska, and from 8 PM this evening to 5 PM Wednesday for Arlington and the I-80 Summit. - Warming trend anticipated for Wednesday and Thursday with less wind for Thursday. && .SHORT TERM /THROUGH WEDNESDAY NIGHT/... Issued at 140 PM MST Tue Nov 19 2024 Tonight...Strong winds have been occurring at Chadron Nebraska with sustained winds of 30 to 40 mph and gusts near 65 mph, thus we have issued a High Wind Warning there until 5 PM as the gradients are expected to lessen by early this evening. Visible satellite imagery and WSR-88D radar indicating snow showers over and near the Snowy and Sierra Madre Ranges, though low levels are quite dry. Will continue with scattered snow showers through the early evening over and near the aforementioned mountains. 700 mb winds increase to 50 to 60 knots by morning, while the Craig-Casper 700 mb and 850 mb height gradients also increase, and our local wind model also suggests increasing winds, thus we will upgrade our High Wind Watches to Warnings for Arlington and the I-80 Summit starting at 8 PM and continuing through Wednesday afternoon. Another cold night on tap with minimums in the teens to lower 20s. Wednesday...Northwest flow aloft continues with heights aloft rising significantly. With 700 mb temperatures near -4 Celsius, maximum temperatures will be warmer, in the 40s. Again, low and mid level gradients suggest another windy day with the High Wind Warning continuing for Arlington and the I-80 Summit areas until 5 PM. Wednesday night...As ridging aloft moves overhead, the low levels will moderate with warmer overnight minimum temperatures. Thursday...A rather pleasant day weatherwise with ridging aloft, and 700 mb temperatures near 2 Celsius yielding maximum temperatures from the upper 40s to upper 50s. Low and mid level gradients suggest breezy conditions along and west of I-25. && .LONG TERM /THURSDAY NIGHT THROUGH MONDAY/... Issued at 140 PM MST Tue Nov 19 2024 Ridging will be present over the central Rockies and high plains region through the first portion of the long range forecast. Underneath this ridge, mid-level temperatures will continue to warm on Friday resulting in afternoon high temperatures 10 to as much as 15 degrees above average, especially in locations east of the Laramie Range. By Saturday, heights will begin to fall somewhat as a broad trough/Pacific jet approach from the west. However, as flow aloft increases, a strong downslope wind pattern will develop in areas east of the mountains. This will result in one more day of well-above-normal temperatures on Saturday. Along and to the west of the Laramie range, surface winds will increase dramatically as this jet moves overhead and strong subsidence develops. High wind products are possible on Saturday afternoon, but forecast guidance is still mixed as to whether winds will exceed 50 knots in the typical wind-prone corridors given increasing cloud cover by this time. Several pieces of energy look to rotate around the broad western trough moving into the Rockies this weekend, each of which will make an attempt at bringing precipitation to southeast Wyoming and western Nebraska. Forecast guidance is still quite dispersive with regard to the timing and placement of these features, and the only really confident element in the forecast from Sunday onward is with regard to a general cool-down in temperatures over the region. One wave of energy will likely eject northward in the form of a weak trough in the northern high plains on Saturday evening into Sunday morning. Some guidance, especially the GFS, supports the idea of a bit farther south system with some light snow in the higher terrain, totaling no more than 2-3 inches. Other guidance including the ECMWF/EPS take this wave of energy too far north to bring any precipitation to our CWA and a dry forecast is favored. Current grids reflect more of an EPS flavor with this system this afternoon. On Sunday night into Monday, a more potent vort max rotates through the central Rockies. This system will bring a Pacific moisture connection with it and a much better chance of accumulating snowfall in southeast Wyoming and possibly the Nebraska panhandle as well. Today's ensemble guidance has certainly trended to a wetter solution with better dynamics and lift over the mountains of southern Wyoming and northern Colorado in the 6z to 18z timeframe on Monday. This solution would bring at least an inch of QPF to the mountains, with some precipitation likely east of I-25 as well. A surface cold front looks to move southward along the high plains sometime on Monday. Precipitation east of I-25 will likely depend on how fast this front moves through - a quicker passage would result in a more favorable surface flow pattern for snow in the high plains. We will continue to monitor forecast trends in the coming days with regard to this potential snow event. && .AVIATION /06Z TAFS THROUGH 06Z THURSDAY/... Issued at 1035 PM MST Tue Nov 19 2024 A weak disturbance aloft will push east into the central plains tonight. Periods of Windy conditions will continue, especially for the southeast Wyoming terminals. HAZARDS/WEATHER TRENDS: VFR conditions expected over the next 24 hours through Wednesday night. Windy conditions with west winds gusting up to 35 knots at times through Wednesday. LLWS will develop at most terminals through 14z as surface winds slowly subside below 15 knots. Winds are forecast to increase shortly after sunrise Wednesday. && .CYS WATCHES/WARNINGS/ADVISORIES... WY...High Wind Warning until 500 PM Wednesday for WYZ110-116. NE...None. && UPDATE...RUBIN SHORT TERM...RUBIN LONG TERM...MAC AVIATION...TJT
Hazardous Weather Outlook National Weather Service Cheyenne WY 201 PM MST Tue Nov 19 2024 NEZ003-019>021-054-055-095-096-WYZ101>109-111>115-117>119-202115- Box Butte County-Scotts Bluff County-Banner County-Morrill County- Kimball County-Cheyenne County-Northern Sioux County- Southern Sioux County-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- Southwest Carbon County-Sierra Madre Range- Upper North Platte River Basin-Snowy Range-Laramie Valley- South Laramie Range Foothills-Central Laramie County- East Laramie County- 201 PM MST Tue Nov 19 2024 This hazardous weather outlook is for portions of panhandle Nebraska...east central Wyoming...south central Wyoming and southeast Wyoming. .DAY ONE...THIS AFTERNOON AND TONIGHT It will remain windy through this afternoon, with scattered snow showers over and near the Snowy, Sierra Madre and Northern Laramie Ranges through early this evening. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY The probability for widespread hazardous weather is low. .Spotter information statement... Spotter activation will not be needed. NEZ002-WYZ110-116-202115- Dawes County-North Snowy Range Foothills-South Laramie Range- 201 PM MST Tue Nov 19 2024 This hazardous weather outlook is for portions of panhandle Nebraska...south central Wyoming and southeast Wyoming. .DAY ONE...THIS AFTERNOON AND TONIGHT A High Wind Warning is in effect until 5 PM today for Dawes County Nebraska, with a High Wind Warning for the North Snowy Range Foothills and South Laramie Range from 8 PM this evening to 5 pm Wednesday. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY A High Wind Warning is in effect until 5 PM Wednesday for the North Snowy Range Foothills and South Laramie Range. .Spotter information statement... Spotter activation will not be needed. Rubin
The national radar mosaic for the moment the first event began.
2 high wind. Local standard time, as filed.
WYDOT sensor at Halleck Ridge, 7 miles northwest of Elk Mountain reported this peak wind gust. Several other WYDOT sensors reported wind gusts in excess of 58 mph during this timeframe.
WYDOT sensor Lone Tree (WY36), located 2 miles west of Buford reported this peak wind gust. Several sensors in WY116 reported wind gusts in excess of 58 mph during this time.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Wyoming in 2024Every state in 2024This day in weather historyWarnings in Wyoming, November 2024
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: 1217280, 1217281.