FLOOD WATCH
NATIONAL WEATHER SERVICE RIVERTON WY
904 AM MDT MON SEP 2 2013
...FLASH FLOOD WATCH IN EFFECT FROM MONDAY MORNING THROUGH MONDAY
EVENING...
.A RELATIVELY DEEP AND MOIST ATMOSPHERE ASSOCIATED WITH AN UPPER
LEVEL DISTURBANCE MOVING INTO THE WESTERN MOUNTAINS OF WYOMING FROM
THE SOUTHWEST...WILL PRODUCE NUMEROUS SHOWERS WITH EMBEDDED
THUNDERSTORMS ACROSS THE WESTERN MOUNTAINS AND JACKSON VALLEY
THROUGH THIS EVENING. UPPER LEVEL FLOW WILL BE MODEST AT BEST...SO
STORMS WILL MOVE RATHER SLOWLY FROM SOUTH TO NORTH WITH SEVERAL
STORMS TRAINING OVER THE SAME AREAS WHICH MAY PRODUCE FLASH
FLOODING CONDITIONS...ESPECIALLY IN AREAS ABOVE 7500 FEET IN
ELEVATION. DEBRIS FLOWS ON STEEP SLOPES OF RECENT WILDFIRES...AND
KNOWN SLIDE AREAS SUCH AS SYLVAN PASS HAVE INCREASED FLASH FLOOD
POTENTIAL.
YELLOWSTONE NATIONAL PARK-ABSAROKA MOUNTAINS-
INCLUDING THE CITIES OF...LAKE...MAMMOTH...OLD FAITHFUL
904 AM MDT MON SEP 2 2013
...FLASH FLOOD WATCH IN EFFECT FROM 1 PM MDT THIS AFTERNOON
THROUGH LATE TONIGHT...
THE NATIONAL WEATHER SERVICE IN RIVERTON HAS EXPANDED THE
* FLASH FLOOD WATCH TO INCLUDE A PORTION OF NORTHWEST WYOMING...
INCLUDING THE ABSAROKA MOUNTAINS AND YELLOWSTONE NATIONAL PARK.
* FROM 1 PM MDT THIS AFTERNOON THROUGH LATE TONIGHT
* A LARGE AREA OF SHOWERS AND THUNDERSTORMS WILL MOVE UP FROM
UTAH AND SOUTHEAST IDAHO THIS MORNING. SOME AREAS COULD SEE AN
INCH OR MORE OF RAIN...ESPECIALLY AT ELEVATIONS OVER 7500
FEET.
* FLASH FLOODING OF SMALL STREAMS WILL BE POSSIBLE AS WELL AS SOME
AREA ROADS WITH POOR DRAINAGE. FIRE BURN SCARS AND SYLVAN PASS
WILL BE PRONE TO DEBRIS FLOWS WHILE ROADS THROUGH STEEP CANYONS
WILL BE SUSCEPTIBLE TO ROCK SLIDES.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A FLASH FLOOD WATCH MEANS THAT CONDITIONS MAY DEVELOP THAT LEAD
TO FLASH FLOODING. FLASH FLOODING IS A VERY DANGEROUS SITUATION.
YOU SHOULD MONITOR LATER FORECASTS AND BE PREPARED TO TAKE ACTION
SHOULD FLASH FLOOD WARNINGS BE ISSUED.
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