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Weather Alert - Upper Wind River Basin
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FGUS75 KRIW 221607
ESFRIW
WYC003-013-023-029-039-240406-
Hydrologic Outlook
National Weather Service Riverton WY
1006 AM MDT Tue May 22 2018

...Accelerated snowmelt at the 9,000 to 10,000 foot elevation
Friday through Sunday...

...Significant rises in creeks and streams during the
Memorial Day Weekend...

The snowpack at the 9,000 to 10,000 foot elevation has ripened
considerably in the last week to 10 days due to mild temperatures
and recent rainfall. Rainfall today and Wednesday will only
further ripen or increase the water content of the current snowpack.

Afternoon mountain temperatures at the 9,000 foot elevation are
expected to warm to near 60 for Thursday--and into the lower to
middle 60s Friday through Sunday. Morning low temperatures are
forecasted to be at or above the frost temperature of 37 degrees
Thursday through Sunday.

Increased snowmelt at the 9,000 to 10,000 foot elevation Friday
through Sunday will cause significant rises in creeks and streams
during the Memorial Day Weekend.

Rain showers are in the forecast for Sunday afternoon through and Memorial
Day. The combination of rain and snowmelt runoff will greatly increase
river levels.

The Wind River and the South Fork of the Shoshone River should see flows
high enough to cause flooding by Monday and Tuesday of next week.
Tributary streams that feed into the Big Horn and Snake Rivers may
see the highest flows of the season early next week.

During active snowmelt runoff, mountain creeks and streams are
at their highest levels during the late afternoon/early evening
hours. Crossing creeks and streams during that time is highly
hazardous.

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



jtfahey


WGUS65 KRIW 221516
FFARIW

URGENT - IMMEDIATE BROADCAST REQUESTED
Flood Watch
National Weather Service Riverton WY
916 AM MDT Tue May 22 2018

...Rapid rises along mountain streams and creeks expected tonight
through early Wednesday morning...

.Three quarters to one inch of rain is expected across the
upper Wind River Basin and Absaroka Mountains tonight through
early Wednesday morning; while one inch to an inch and a half
inch of rain is forecasted across the Big Horn Mountains tonight
through early Wednesday morning. Locally higher amounts of
precipitation is possible with thunderstorms. Rapid rises of
streams and creeks will cause flooding of low lying areas tonight
through Wednesday morning.


WYZ002-004-006-008-009-015-016-231530-


Absaroka Mountains-North Big Horn Basin-Southeast Big Horn Basin-
Bighorn Mountains West-Bighorn Mountains Southeast-
Wind River Mountains East-Upper Wind River Basin-
Including the cities of Worland and Dubois
916 AM MDT Tue May 22 2018

...FLOOD WATCH IN EFFECT FROM 6 PM MDT THIS EVENING THROUGH
WEDNESDAY MORNING...

The National Weather Service in Riverton has issued a

* Flood Watch for portions of central Wyoming, north central
Wyoming, and northwest Wyoming, including the following areas,
in central Wyoming, Upper Wind River Basin and Wind River
Mountains East. In north central Wyoming, Bighorn Mountains
Southeast, Bighorn Mountains West, and Southeast Big Horn
Basin. In northwest Wyoming, Absaroka Mountains and North Big
Horn Basin.

* From 6 PM MDT this evening through Wednesday morning

* Three quarters to one inch of rain is expected across the upper
Wind River Basin and Absaroka Mountains tonight through early
Wednesday morning; while one inch to an inch and a half inch of
rain is forecasted across the Big Horn Mountains tonight through
early Wednesday morning. Locally higher amounts of
precipitation is possible with thunderstorms.

* Rapid rises of streams and creeks will cause flooding of low
lying areas tonight through Wednesday morning.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Flood Watch means there is a potential for flooding based on
current forecasts.

You should monitor later forecasts and be alert for possible
Flood Warnings. Those living in areas prone to flooding should be
prepared to take action should flooding develop. Crossing creeks
and streams will be very hazardous tonight through early
Wednesday morning.

&&



Atlantic
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