503
FGUS75 KRIW 211850
ESFRIW
WYC003-017-019-029-043-222300-

Hydrologic Outlook
National Weather Service Riverton WY
1150 AM MST Fri Feb 21 2025

...Warm Temperatures this Weekend increasing Snowmelt and Ice Jam
Flooding Potential in North-central WY...

Low elevation snowpack of around 6 to 12 inches exists across much
of the northern portion of the Bighorn Basin including Greybull,
Lovell, Powell, and Cody. This snowpack contains an estimated 2 to 4
inches of Snow Water Equivalent (SWE). Temperatures beginning Sunday
are expected to climb into the mid 40s to low 50s. The warm
temperatures are expected to persist through at least the middle of
next week.

The warm temperatures, combined with the significant low elevation
snowpack, could result in significant melting and injection into
local rivers and streams. Ice break up on the Bighorn and Nowood
Rivers is possible as well, and could lead to ice jamming and
potential resultant flooding.

Similar snowpack also exists across portions of northern Johnson
County. Although the risk for ice jams is lower, ponding of water
and overland runoff could fill culverts and other low-lying areas.

Now would be the time to clear snow, ice, and debris from culverts
and other flow paths to allow runoff to flow away from buildings and
other vulnerable infrastructure. This could include moving deep snow
away from the foundations of buildings, relocating equipment to
higher ground, and moving livestock out of poorly drained or low-
lying areas.

Stay tuned for the latest river forecasts.

$$

Wittmann