WYOMING – A Hydrologic Outlook has been issued by the National Weather Service for all of western Wyoming. A realtime map has also been made available by the NWS in recognition of the advisory.
A marked warming trend beginning midweek and last through the weekend will cause steady rises in small creeks and streams Friday afternoon through Sunday afternoon. Snowmelt runoff into small streams and creeks will drastically increase due to warm basin temperatures across western and central Wyoming Thursday through Saturday.
Afternoon temperatures at the 9,000-foot elevation are forecasted to be into the middle 50s Thursday and near 60 by Friday and Saturday. Isolated rain showers are also expected over central and western Wyoming Saturday and Sunday afternoons.
Tributary creeks and streams may reach bankfull by Saturday evening through Sunday morning due to excess snowmelt runoff. Minor flooding of low-lying areas is possible due to the elevated stream levels. Main stem rivers will see noticeable rises by Sunday morning with continued rises possible on Monday.
Main stem rivers are expected to remain below flood levels through Monday, however.