Wyoming Water Supply Outlook--Feb 12, 2019

HIGHLIGHTS

…Wyoming January 2019 precipitation was 110 to 115 percent of average...

...Current water year precipitation is averaging 95 to 105 percent of normal across Wyoming…

…Mountain snowpack across Wyoming is 85 to 95 percent of median...

…Wyoming reservoirs are averaging 70 to 75 percent of capacity in early February…

…Below normal snowmelt streamflow volumes are expected across several major basins in Wyoming…

QUICK SYNOPSIS

January 2019 precipitation totals across Wyoming were 110 to 115 percent of average. Precipitation numbers varied between 150 percent of normal over the Belle Fourche River Drainage (northeast Wyoming) to near 70 percent of average over the Big Horn River Basin (north central Wyoming). Current water year (October 2018 - January 2019) precipitation across Wyoming was 95 to 105 percent of average.

Mountain snowpack across Wyoming was 85 to 95 percent of median by early February. Snowpack "water" numbers and/or SWEs were the highest across basins in southeast Wyoming—varying between 100 to 125 percent of median. SWEs across basins in western Wyoming were 75 to 85 percent of median.

Below normal (75 to 90 percent) snowmelt streamflow volumes are expected across several major basins across Wyoming. Above average snowmelt streamflow volumes are expected across the Upper North Platte and Laramie Watersheds. The Wind, Big Horn, and Upper Green Basins are forecasted to have below normal streamflow volumes during the upcoming snowmelt season.

Wyoming reservoirs are averaging 70 to 75 percent of capacity in early February. Reservoirs storages across Wyoming remain above average at 105 to 115 percent for February.

The latest Wyoming water supply outlook graphic:

Back-to-Back Pacific Storms to Impact the West Coast; Heavy Snow in the Central Appalachians