Powerful downslope winds developed in portions of the Front Range Mountains and Foothills on the evening of the 31st. Peak wind gusts included: 96 mph near Georgetown, 93 mph near Berthoud Pass, 81 mph near Georgetown, 80 mph near Aspen Springs and Blackhawk, 78 mph near Gold Hill, 76 mph near Floyd Hill, with 75 mph near Dumont.
Every event with a place to put it; 3 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 BOU wrote it up.
Powerful downslope winds developed in portions of the Front Range Mountains and Foothills on the evening of the 31st. Peak wind gusts included: 96 mph near Georgetown, 93 mph near Berthoud Pass, 81 mph near Georgetown, 80 mph near Aspen Springs and Blackhawk, 78 mph near Gold Hill, 76 mph near Floyd Hill, with 75 mph near Dumont.
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 Denver/Boulder, CO wrote its last area forecast discussion before the first event at Oct 31, 2:03 PM MST, 5 hours 17 minutes earlier.
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</html>Hazardous Weather Outlook National Weather Service Denver/Boulder CO 1127 AM MDT Tue Oct 31 2017 COZ030>051-011730- Jackson County Below 9000 Feet- West Jackson and West Grand Counties Above 9000 Feet- Grand and Summit Counties Below 9000 Feet- South and East Jackson/Larimer/North and Northeast Grand/ Northwest Boulder Counties Above 9000 Feet- South and Southeast Grand/West Central and Southwest Boulder/ Gilpin/Clear Creek/Summit/North and West Park Counties Above 9000 Feet-Larimer and Boulder Counties Between 6000 and 9000 Feet- Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear Creek/Northeast Park Counties Below 9000 Feet- Central and Southeast Park County- Larimer County Below 6000 Feet/Northwest Weld County- Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County- North Douglas County Below 6000 Feet/Denver/West Adams and Arapahoe Counties/East Broomfield County- Elbert/Central and East Douglas Counties Above 6000 Feet- Northeast Weld County-Central and South Weld County-Morgan County- Central and East Adams and Arapahoe Counties- North and Northeast Elbert County Below 6000 Feet/North Lincoln County- Southeast Elbert County Below 6000 Feet/South Lincoln County- Logan County-Washington County-Sedgwick County-Phillips County- 1127 AM MDT Tue Oct 31 2017 ...HIGH WIND WARNING FOR FRONT RANGE MOUNTAINS AND FOOTHILLS... This hazardous weather outlook is for northeast and north central Colorado. .DAY ONE...This Afternoon and Tonight Stronger winds will develop over the mountains and higher foothills late this evening, with peak gusts in wind prone areas possibly reaching 75 mph or greater. The strongest winds will occur in areas above timberline and along the Peak to Peak Highway. .DAYS TWO THROUGH SEVEN...Wednesday through Monday Strong and gusty downslope winds should continue in the mountains to the north of the I-70 corridor and the Front Range Foothills into early Wednesday evening. Peak wind gusts in wind prone areas may exceed 75 mph. Wednesday will also be warm and breezy on the plains. Fire danger will be elevated. Dry weather and seasonal temperatures will return Thursday and Friday. Some moisture will return to the mountains from late Saturday through Monday with some alpine showers. .SPOTTER INFORMATION STATEMENT... Spotter activation will not be needed today or tonight. However, any reports of strong, gusty winds will be appreciated. Hanson
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</html>The national radar mosaic for the moment the first event began.
3 high wind. Local standard time, as filed.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Colorado in 2017Every state in 2017This day in weather historyWarnings in Colorado, October 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 2026-10-01. Each event’s entry at NCEI: 723871, 723872, 723873.