442
NGAK89 PAFG 312346
HCMAFG
HYDROMETEOROLOGICAL COORDINATION MESSAGE
ALASKA-PACIFIC RIVER FORECAST CENTER
NATIONAL WEATHER SERVICE ANCHORAGE AK
228 PM AKDT WED MAY 31 2023
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CONTACT:
CELINE VAN BREUKELEN 266-5161 350-9219 (CELL PHONE AFTER 5 PM)
HAS DESK 266-5164 HAS CELL PHONE 350-9221
LOCATION:
PRODUCT TYPE: ADVISORY
EXPIRATION TIME: SATURDAY AFTERNOON
PRIMARY CAUSE: SNOWMELT
REASON FOR WARNING/ADVISORY:
WHAT...FLOODING CAUSED BY BACKWATER FROM RECENT ICE JAMS AND SNOWMELT.
WHERE... LOWER YUKON AND ASSOCIATED TRIBUTARIES FROM GRAYING DOWNSTREAM
TO THE YUKON DELTA AS FAR AS NUNAM IQUA AND KOTLIK.
WHEN: UNTIL 4PM SATURDAY
IMPACTS: BACKWATER FROM ICE JAMS BETWEEN RUSSIAN MISSION THE YUKON DELTA
AS WELL AS SNOWMELT HAS LEAD TO EXTENSIVE OVERBANK FLOODING OF LOWLANDS
ON THE LOWER YUKON FROM GRAYLING THROUGH THE DELTA, AS WELL AS THE INNOKO
RIVER AT SHAGELUK.
ADDITIONAL DETAILS:
THE BREAKUP FRONT HAS ALREADY PASSED THE DELTA, HOWEVER WATER LEVELS REMAIN
HIGH FROM SNOWMELT AND THE RECENT ICE JAMS. THE USGS RIVER GAGE AT PILOT
STATION SHOWS THAT THE WATER HAS ONLY DROPPED ABOUT A HALF FOOT SINCE ITS
CREST ON FRIDAY. SATELLITE IMAGERY CONFIRMS OVERLAND FLOODING IN SHAGELUK,
HOLY CROSS, RUSSIAN MISSION, MARSHALL AND PILOT STATION. WATER LEVELS WILL
LIKELY BE INCREASING FOR THE COMMUNITIES OF EMMONAK, ALAKANUK, NUNAM IQUA AND
KOTLIK, BUT ARE UNLIKELY TO REACH THE LEVELS EXPERIENCED OVER THE WEEKEND.
WATER LEVELS FROM GRAYLING THROUGH THE DELTA WILL REMAIN HIGH OVER THE COMING DAYS.
EXPECTED IMPACTS:
COMMENTS:
COULD YOU ADJUST THE POLYGON TO INCLUDE THE LOWER YUKON DELTA (EMO, NUNAM, ETC?)
THANKS!
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