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AGAK78 PACR 172252
HMDACR

HYDROMETEOROLOGICAL DISCUSSION
NWS ALASKA PACIFIC RIVER FORECAST CENTER ANCHORAGE AK
300 PM AKDT FRI APR 17 2015 

...FLOOD POTENTIAL... 

OVERFLOW DUE TO AUFIES IN THE SAGAVANIRKTOK RIVER IS EXPECTED TO 
CONTINUE TO CAUSE FLOODING ON THE DALTON HIGHWAY NEAR PRUDHOE BAY ON 
THE NORTH SLOPE.

FLOOD POTENTIAL IS LOW FOR THE REST OF THE STATE.

...HYDROMETEOROLOGICAL DISCUSSION...
 
A BROAD UPPER-LEVEL TROUGH IS LOCATED OVER THE BERING... WITH A 
CLOSED LOW SOUTH OF THE CENTRAL ALEUTIANS.  THIS UPPER-LEVEL LOW 
WILL MOVE TO THE SOUTHERN AKPEN BY SATURDAY NIGHT... THEN RECURVE 
INTO THE EASTERN BERING ON SUNDAY AS A RIDGE BUILDS FROM BRITISH 
COLUMBIA THROUGH THE YUKON TERRITORY AND NORTHEAST MAINLAND AND OVER 
THE ARCTIC OCEAN.  DISTURBANCES ROTATING AROUND THE TROUGH WILL 
BRING PERIODS OF PRECIPITATION TO MUCH OF THE GULF COAST THIS 
WEEKEND... AND OCCASIONAL PRECIPITATION TO THE SOUTHWEST MAINLAND.

...SNOW DEPTH...

OVER THE PAST WEEK SNOW DEPTHS GENERALLY DECREASED OR WERE STEADY 
AROUND THE STATE.  SNOW WATER EQUIVALENTS ARE LESS THAN 50% OF 
NORMAL ON THE KENAI PENINSULA AND ARE GENERALLY BETWEEN 50 AND 100% 
OF NORMAL OVER MUCH OF THE REST OF SOUTHCENTRAL ALASKA... WHILE SNOW 
WATER EQUIVALENTS ARE GENERALLY BETWEEN 50 AND 150% OF NORMAL IN 
MUCH OF THE COPPER RIVER BASIN AND THE INTERIOR.

...ICE THICKNESS...

ICE THICKNESS MEASURED NEAR THE BEGINNING OF APRIL INCLUDED: 26 TO 
40 INCHES IN THE MIDDLE TANANA BASIN... 56 INCHES AT EAGLE ON THE 
YUKON... 11 INCHES ON THE KENAI PENINSULA... 18 INCHES IN 
ANCHORAGE... 29 TO 38 INCHES IN THE KUSKOKWIM BASIN... 34 INCHES AT 
BETTLES ON THE KOYUKUK RIVER... AND 65 INCHES AT COLVILLE VILLAGE.

...LONG RANGE...

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

THE 6 TO 10 DAY PRECIPITATION OUTLOOK HAS INCREASED CHANCES FOR 
ABOVE NORMAL PRECIPITATION OVER THE SEWARD PENINSULA... MOST OF 
SOUTHWEST ALASKA... THE AKPEN... AND KODIAK ISLAND.  THERE ARE 
INCREASED CHANCES FOR BELOW NORMAL PRECIPITATION OVER MOST OF THE 
REST OF THE STATE.

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

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

THIS HYDROMET DISCUSSION WILL BE ISSUED EVERY FRIDAY UNTIL BREAKUP 
BEGINS IN THE SPRING.
 
A GRAPHICAL VERSION OF THE HYDROMET DISCUSSION IS AVAILABLE AT  
HTTP://APRFC.ARH.NOAA.GOV/PRODUCTS/GHMD.PHP

A GRAPHICAL SLIDE SHOW PRESENTATION OF HYDROMET ISSUES IS AVAILABLE 
AT HTTP://APRFC.ARH.NOAA.GOV/PRODUCTS/PRESENT
$$

ACL

National Weather Service
Alaska-Pacific River Forecast Center
6930 Sand Lake Road
Anchorage, Ak 99502
907-266-5160

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