Public Information Statement
Issued by NWS Riverton, WY
Issued by NWS Riverton, WY
196 NOUS45 KRIW 191816 PNSRIW WYZ001>020-022>030-200556- Public Information Statement National Weather Service Riverton WY 1156 AM MDT Tue May 19 2026 ...SNOWFALL REPORTS... A late-season winter storm impacted central and southern Wyoming the night of May 17th through the day of May 18th. The heaviest snow fell between about 2am and 10am MDT. The largest totals were for upslope favored locations like the Lander Foothills, southern Casper and Casper Mountain, as well for locations between South Pass and Jeffrey City and south into eastern Sweetwater County, especially for Interstate 80 east of Rock Springs. Totals of 8 inches or more were seen in the mentioned locations, with around a foot of snow over South Pass and around 20 inches on Casper Mountain. Reports for Sinks Canyon Park near Lander were near 12 inches, with around 19 inches at the top of the switchbacks. Listed below are snowfall reports from this event. Location Amount Elevation (ft.) ...Wyoming... ...Fremont County... 5 SW Lander 16.0 in 5976 13 SW Lander 14.0 in 8725 6 SW Lander 13.8 in 6043 Sinks Canyon Park 12.0 in 10 NNW South Pass City 12.0 in 9659 9 S Lander 11.4 in 5996 11 WSW Burris 11.0 in 9903 2 SSE Lander 8.8 in 5517 14 SW Fort Washakie 8.0 in 10065 Jeffrey City 8.0 in 4 WSW Lander 7.0 in 5754 7 WNW Lander 6.3 in 6040 6 WSW Dubois 5.0 in 9411 2 NNW Lander 5.0 in 5340 15 W Fort Washakie 3.0 in 8444 1 WNW Dubois 3.0 in 6955 6 WNW Riverton 0.3 in 5570 2 W Riverton 0.1 in 5070 ...Hot Springs County... 18 ESE Lucerne 2.7 in 4874 ...Johnson County... 8 NNE Mayoworth 1.8 in 5058 3 SSW Mayoworth 0.8 in 5477 ...Lincoln County... Afton 1.8 in 6255 3 N Etna 1.6 in 5927 1 SE Thayne 1.3 in 6071 4 NNE Thayne 1.0 in 6248 Afton 0.2 in 6229 ...Natrona County... 7 S Casper 22.0 in 8070 12.8 SSE Milles 21.0 in 22 SE Casper 18.0 in 8402 Southern Casper 8.0 in 1 WSW Casper 7.0 in 5199 1 E Casper 6.1 in 5280 5 W Mills 3.0 in 5351 4 NW Mills 2.5 in 5278 ...Park County... Pahaska 3.0 in 6687 ...Sublette County... 5 SE Pinedale 1.5 in 7137 1 NNW Pinedale 1.2 in 7204 3 W Boulder 1.0 in 6944 ...Sweetwater County... 1 NNW Green River 3.5 in 6097 1 SSW Green River 2.5 in 6309 2 SSE Green River 1.6 in 6203 ...Teton County... Kelly 0.5 in 6652 3 SSW Wilson 0.2 in 6996 1 NNE Jackson Trace 6226 Observations are collected from a variety of sources with varying equipment and exposures. We thank all volunteer weather observers for their dedication. Not all data listed are considered official. $$