Hydrometeorological Discussion
Issued by NWS Alaska-Pacific RFC

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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



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