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Weather Alert - Southeast Big Horn Basin
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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.

&&


WWUS85 KRIW 221501
SPSRIW

Special Weather Statement
National Weather Service Riverton WY
901 AM MDT Tue May 22 2018

WYZ002>011-014>020-022-230000-
Absaroka Mountains-Cody Foothills-North Big Horn Basin-
Southwest Big Horn Basin-Southeast Big Horn Basin-
Owl Creek and Bridger Mountains-Bighorn Mountains West-
Bighorn Mountains Southeast-Northeast Johnson County-
Southeast Johnson County-Wind River Mountains West-
Wind River Mountains East-Upper Wind River Basin-Wind River Basin-
Lander Foothills-Green Mountains and Rattlesnake Range-
Natrona County Lower Elevations-Casper Mountain-
Including the cities of Cody, Meeteetse, Thermopolis, Worland,
Buffalo, Kaycee, Dubois, Riverton, Shoshoni, Lander,
Jeffrey City, and Casper
901 AM MDT Tue May 22 2018

...Strong to Severe Thunderstorms Possible This Afternoon and
Evening...
...Very Heavy Rain Also Possible with the Potential for Flash
Flooding...

An approaching weather disturbance will help organize showers and
thunderstorms later this afternoon through the nighttime hours.
The disturbance will approach Fremont and Natrona Counties late
this afternoon and then lift northward through the night. Showers
and thunderstorms will be widespread as they lift northward across
the area. Some of the storms will be quite strong to possibly
severe with hail, strong wind and very heavy rain. The strongest
storms could produce one inch hail, very strong wind gusts and
intense rainfall of 1 to 2 inches. Flash flooding is also
possible where heavy rain persists, especially around the
foothills of the Absarokas, Bighorn Mountains and Owl Creeks. The
Upper Wind River Basin Foothills including Dubois could also see
some very heavy rain this evening.

Stay tuned for the latest update on this very active weather day
from your National Weather Service office in Riverton. If you
encounter any severe weather, please call us at 1 800 211 1448 or
your local law enforcement office.

FGUS75 KRIW 211513
ESFRIW
WYC003-013-029-039-043-222113-
Hydrologic Outlook
National Weather Service Riverton WY
913 AM MDT Mon May 21 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...

There is still 20 to 30 inches of snow water equivalents (SWEs)
at the 9,000 to 10,000 foot elevation. The snowpack has ripened
considerably in the last week to 10 days due to mild temperatures
and recent rainfall.

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

Any rainfall on Sunday and Memorial Day will greatly increase creek
and river levels due to a combination of rain and snowmelt runoff.

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



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