A fast moving upper level disturbance produced brief heavy snow showers along and just east of the Laramie Range. Snow accumulations ranged from three to nine inches, heaviest over the northern Laramie Range.
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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 produced brief heavy snow showers along and just east of the Laramie Range. Snow accumulations ranged from three to nine inches, heaviest over the northern Laramie Range.
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 Apr 12, 4:06 AM MST, 1 hour 54 minutes earlier.
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</html>The national radar mosaic for the moment the first event began.
3 winter weather. Local standard time, as filed.
The Windy Peak SNOTEL site (elevation 7900 ft) estimated five inches of snow.
The Laprele Creek SNOTEL site (elevation 8375 ft) estimated eight inches of snow.
Three inches of snow was reported eight miles southwest of Wheatland.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Wyoming in 2013Every state in 2013This day in weather historyWarnings in Wyoming, April 2013
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: 436789, 436790, 436787.