Hydrometeorological Discussion
Issued by NWS Alaska-Pacific RFC

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AGAK78 PACR 202352
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HYDROMETEOROLOGICAL DISCUSSION
NWS ALASKA PACIFIC RIVER FORECAST CENTER ANCHORAGE AK
300 PM AKDT FRI FEB 20 2015

...FLOOD POTENTIAL...

FLOOD POTENTIAL IS LOW FOR THE STATE OF ALASKA.

PRECIPITATION EXPECTED TO FALL FROM THE EASTERN KENAI PENINSULA TO
EAST OF YAKUTAT THIS WEEKEND MAY LEAD TO RAPID WATER LEVEL RISES ON
AFFECTED STREAMS... BUT FLOODING IS NOT EXPECTED AT THIS TIME.

...HYDROMETEOROLOGICAL DISCUSSION...

A RIDGE OVER THE EASTERN GULF/SOUTHEAST ALASKA AND A TROUGH OVER THE
BERING TO SOUTH OF THE CENTRAL ALEUTIANS WILL SLOWLY MOVE EASTWARD
THIS WEEKEND.  THIS WILL LEAD TO GENERALLY SOUTHERLY FLOW - WITH
OCCASIONAL EMBEDDED SHORTWAVES - OVER THE WESTERN MAINLAND EARLY IN
THE WEEKEND... WITH THE SOUTHERLY FLOW EXPANDING EASTWARD AND
BECOMING SOUTHWESTERLY BY THE END OF THE WEEKEND.  THIS WILL KEEP
WESTERN AND SOUTHERN ALASKA UNSEASONABLY WARM AND WET.

...SNOW DEPTH...

OVER THE PAST WEEK SNOW DEPTHS GENERALLY INCREASED 1-3 INCHES OVER
WESTERN ALASKA... WHILE CHANGES IN SNOW DEPTHS WERE MIXED OVER THE
EASTERN INTERIOR AND OVER THE SOUTHEAST MAINLAND.  SNOW DEPTHS
GENERALLY DECREASED OVER SOUTHEAST ALASKA.  SNOW WATER EQUIVALENTS
ARE LESS THAT 50% OF NORMAL ON THE KENAI PENINSULA... WHILE SNOW
WATER EQUIVALENTS ARE GENERALLY BETWEEN 50 AND 77% OF NORMAL NEAR
FAIRBANKS.

...ICE THICKNESS...

ICE THICKNESS MEASURED AT THE BEGINNING OF FEBRUARY INCLUDED: 13 TO
30 INCHES IN THE MIDDLE TANANA BASIN... 17 TO 20 INCHES AROUND THE
ANCHORAGE AREA... 39 INCHES AT BETTLES... AND 51 INCHES AT COLVILLE
VILLAGE.

...LONG RANGE...

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

THE 6 TO 10 DAY PRECIPITATION OUTLOOK HAS INCREASED CHANCES FOR
ABOVE NORMAL PRECIPITATION OVER THE NORTHWEST QUARTER OF THE
MAINLAND.  THERE ARE INCREASED CHANCES OF BELOW NORMAL PRECIPITATION
FROM THE KUSKOKWIM DELTA ACROSS SOUTHCENTRAL AND THE SOUTHEAST
MAINLAND... AS WELL AS OVER SOUTHEAST ALASKA.

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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