An area of low pressure moved out of the Rockies and onto the plains. A strong pressure gradient created high winds for several hours.
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.
An area of low pressure moved out of the Rockies and onto the plains. A strong pressure gradient created high winds for several hours. Most of the area observed winds gusting over 40 mph with some localized sites seeing winds in excess of 60 mph.
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 Oct 1, 8:57 AM MST, 1 hour 3 minutes earlier.
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</html>2 high wind. Local standard time, as filed.
Wyoming Department of Transportation equipment measured a wind gust of 60 mph 4 miles east southeast of Interstate 80 exit 345.
Wyoming Department of Transportation (Whitaker) equipment measured sustained winds of 40 mph or stronger for over an hour with a peak gust of 57 mph.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Wyoming in 2009Every state in 2009This day in weather historyWarnings in Wyoming, October 2009
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: 192637, 192638.