So far, Wyoming's water supply is looking fairly good this winter.
December 2016 precipitation totals across Wyoming were 170 to 180 percent of average, according to Jim Fahey, Wyoming hydrologist with the National Oceanic and Atmospheric Administration.
Fahey sent out an email on Monday detailing the month's water outlook. In it he wrote, "Precipitation numbers varied between 255 percent of normal over the Wind River drainage to near 120 percent of normal over the Little Snake Watershed (south-central Wyoming). Current water year (October-December 2016) precipitation across Wyoming is 110 to 115 percent of average."
Mountain snowpack across Wyoming was 105 to 110 percent of median by early January. Snow water equivalents were the highest across basins in central through western Wyoming —varying between 115 to 145 percent of median. SWEs across basins in southeastern Wyoming were near to 100 percent of median. SWEs across the Powder River Basin were 80 percent of median.
Although it's still early, the forecast is for above normal (110 to 115 percent) snowmelt streamflow volumes expected across most major basins in Wyoming. Above average streamflow volumes are expected across the Wind, Shoshone, Upper Yellowstone, Upper Green, and Sweetwater watersheds. The Powder, Tongue, Upper Yellowstone, and Little Snake basins are forecasted to have below to near normal streamflow volumes during the upcoming snowmelt season.
Reservoirs storages across Wyoming are above average at 115 to 125 percent for January.