A well forecast storm dumped recording setting precipitation on the Riverton and Lander areas Thursday and Friday. Star Valley was totally missed by this storm as the strong east winds on the north side of the deep upper low over the 4-corners resulted in drying winds as they came downslope across the mountains of western Wyoming.
Following is the detailed summary of the storm from Riverton Forecast Office.
SYNOPSIS: A strong slow-moving upper level low pressure system moved across the Great Basin and Four Corners area Thursday and Friday. The storm brought 20 to over 30 inches of snowfall to the eastern Wind River Mountains, and widespread precipitation amounts over 2.50" to the Wind River Basin. A top rainfall amount (with some snow mixed in) of 4.65 inches at a weather station in Arapahoe on the Wind River Indian Reservation. The Riverton Airport set an all-time daily record precipitation record with 2.64 inches of precipitation measured on March 31st. Lander had their 6th highest all-time daily precipitation total on 127 years of record, measuring 2.71 inches on March 31st. South Pass remained closed early Saturday morning due to a sustained period of blizzard conditions with around 20 inches of snowfall since Thursday evening. The Wyoming Department of Transportation expects to open the road sometime after 8 am Saturday morning.