Flood Potential Outlook
Issued by NWS Riverton, WY

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Hydrologic Outlook
National Weather Service Riverton WY
1008 AM MDT Fri May 26 2017

...Warm mountain temperatures Wednesday through Friday of
next week will accelerate snowmelt runoff...

...Rain on melting snowpack Friday through Sunday of next
week will greatly increase the flood threat...

The snowpack at 8,500 to 9,500 foot elevation is very ripe or water
laden and is ready to melt off.  There is still 30 to 35 inches of
snow water equivalents (SWEs) at several SNOTEL locations at the
9,000 to 10,000 foot elevation across the Wind, Green, Shoshone,
and Upper Yellowstone Basins.

Afternoon temperatures at the 9,000 foot elevation are expected to
warm into the lower to middle 60s Wednesday through Friday of
next week.  Morning low temperatures will also be above the frost
temperature of 37 degrees Wednesday through Saturday of next week.
Windy conditions over the mountains are expected Wednesday and again
on Friday. Cold front will move through central Wyoming Friday evening.
Widespread rainshowers are expected Friday evening through Saturday
morning.  Scattered rainshowers are forecasted continue through the rest
of the weekend.

Accelerated snowmelt runoff will cause sharp increases in stream and
river levels Thursday morning through Saturday morning. Rain on a melting
snowpack next weekend will cause additional significant rises to creeks
and rivers. Flooding is expected along main stem rivers like the Green,
Little Wind, Wind, Sweetwater, and Shoshone by next weekend.

People living near flood prone areas along streams and rivers should make
final preparations for high water late next week through next weekend.
Mountain streams run the highest in the late afternoon through early evening.
Do not attempt to cross streams at that time as the swift water will easily
carry you downstream.

Graphical forecasts are available at:
http://water.weather.gov/ahps2/index.php?wfo=riw
Visit weather.gov/riverton and select the rivers & lakes tab for
graphical forecasts and additional information.

$$
jtfahey






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