Hydrometeorological Discussion
Issued by NWS Alaska-Pacific RFC

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AGAK78 PACR 082359
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HYDROMETEOROLOGICAL DISCUSSION
NWS ALASKA PACIFIC RIVER FORECAST CENTER ANCHORAGE AK
300 PM AKDT FRI DEC 8 2017

...FLOOD POTENTIAL...

RECENT RAIN HAS WATER LEVELS HIGH ON SOME STREAMS ALONG THE NORTH
GULF COAST... INCLUDING THE EYAK RIVER NEAR CORDOVA AND THE SITUK
RIVER NEAR YAKUTAT.  PERIODS OF RAIN ARE FORECAST FOR THIS AREA INTO
NEXT WEEK.  THIS WILL LEAD TO FLUCTUATING WATER LEVELS ON STREAMS IN
THIS AREA... WITH WATER LEVELS APPROACHING BANKFULL AT TIMES... BUT
FLOODING IS NOT EXPECTED AT THE CURRENT TIME.

THE FLOOD POTENTIAL IS CURRENTLY LOW FOR THE REST OF STATE.

...HYDROMETEOROLOGICAL DISCUSSION....

THE UPPER LEVEL PATTERN OF A STRONG RIDGE OVER WESTERN NORTH AMERICA
AND A TROUGH FROM THE BERING INTO THE NORTH PACIFIC HAS BEEN
BRINGING PERIODS OF PRECIPITATION TO MUCH OF THE STATE OVER THE LAST
FEW DAYS... WITH HEAVY RAIN ALONG THE NORTH GULF COAST AND HEAVY
SNOW IN THE COASTAL MOUNTAINS OF THE NORTH GULF COAST.  THIS BASIC
PATTERN IS NOT FORECAST TO CHANGE THROUGH THE MIDDLE OF NEXT WEEK.

...SNOW DEPTH...

REPORTED SNOW DEPTHS AROUND THE STATE RANGE FROM NO SNOW OVER MOST
OF THE SOUTHERN AND CENTRAL SOUTHEAST TO 118 INCHES AT A STATION
NEAR THOMPSON PASS... BUT MOST LOW ELEVATION STATIONS ACROSS THE
STATE ARE REPORTING LESS THAN 40 INCHES OF SNOW.  MOST MAINLAND
STATIONS REPORTED EITHER NO CHANGE IN SNOW DEPTH OR INCREASES IN
SNOW DEPTH OVER THE LAST 7 DAYS... WITH THE STATION NEAR THOMPSON
PASS REPORTING AN INCREASE OF 76.5 INCHES OF SNOW DURING THAT PERIOD.

...ICE THICKNESS...

ICE THICKNESS READINGS ARE TAKEN AT THE START OF THE MONTH ONCE THE
ICE IS THICK ENOUGH TO SAFELY MEASURE.  ICE THICKNESS MEASUREMENTS
REPORTED FOR EARLY DECEMBER INCLUDE:  6 TO 9 INCHES IN ANCHORAGE...
12 TO 17 INCHES AT MCGRATH... 9 INCHES AT LAKE MINCHUMINA... 10 TO
18 INCHES IN THE FAIRBANKS AREA... 12 INCHES AT EAGLE... 20 INCHES
AT BETTLES... AND 14 INCHES AT COLVILLE VILLAGE.

...LONG RANGE...

THE 6 TO 10 DAY TEMPERATURE OUTLOOK HAS INCREASED PROBABILITIES OF
ABOVE NORMAL TEMPERATURES OVER THE ENTIRE STATE.

THE 6 TO 10 DAY PRECIPITATION OUTLOOK HAS INCREASED PROBABILITIES OF
ABOVE NORMAL PRECIPITATION OVER THE ENTIRE STATE.

PLEASE REFER TO THE CLIMATE PREDICTION CENTER HOME PAGE FOR FURTHER
INFORMATION.

....................................................................

THIS TEXT PRODUCT WILL BE ISSUED WEEKLY ON FRIDAY UNTIL RIVER ICE
BREAKUP IN MAY 2018. A GRAPHICAL VERSION OF THE HYDROMET DISCUSSION
IS AVAILABLE AT HTTP://WWW.WEATHER.GOV/APRFC/GRAPHICALHMD

$$
ACL


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