Hydrometeorological Discussion
Issued by NWS Alaska-Pacific RFC

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AGAK78 PACR 202303
HMDACR

HYDROMETEOROLOGICAL DISCUSSION
NWS ALASKA PACIFIC RIVER FORECAST CENTER ANCHORAGE AK
300 PM AKDT FRI APR 20 2018

...FLOOD POTENTIAL...

THE FLOOD POTENTIAL IS CURRENTLY LOW FOR THE STATE.

...HYDROMETEOROLOGICAL DISCUSSION....

A LOW PRESSURE SYSTEM IS WEAKENING IN THE GULF... BUT IT WILL STILL
BRING SHOWERS OVER MUCH OF THE SOUTHERN MAINLAND AND INTO THE
EASTERN INTERIOR TODAY.  AN UPPER LEVEL TROUGH WILL DIG
SOUTHWESTWARD ACROSS THE MAINLAND TODAY AND DEVELOP A LOW IN THE
EASTERN BERING ON SATURDAY.  THIS LOW... AND A LOW MOVING SOUTH OF
IT INTO THE GULF... WILL KEEP PERIODS OF RAIN ALONG THE GULF COAST
AND SOUTHEAST ALASKA THROUGH THE WEEKEND... WITH PERIODS OF SHOWERS
LIKELY OVER THE SOUTHERN MAINLAND.

...SNOW DEPTH...

REPORTED SNOW DEPTHS AROUND THE STATE RANGE FROM NO SNOW AT
BETHEL... SOME STATIONS ON KODIAK ISLAND... THE AKPEN... AND MANY
LOW ELEVATION AND COASTAL STATIONS IN SOUTHEAST ALASKA... TO 111
INCHES AT A STATION NEAR THE TOP OF MOUNT ALYESKA.  SNOW DEPTHS HAVE
DECREASED AT MOST LOCATIONS OVER THE PAST WEEK.

NRCS SNOW WATER EQUIVALENT DATA FROM EARLY APRIL SHOW GREATER THAN
NORMAL SNOW WATER CONTENT IN THE HILLS NORTHEAST OF FAIRBANKS AND
NEAR BETTLES... GENERALLY LOWER THAN NORMAL SNOW WATER CONTENT FROM
THE KENAI PENINSULA NORTH THROUGH THE SUSITNA VALLEY... AND NEAR
NORMAL SNOW WATER CONTENT IN THE EASTERN COPPER RIVER VALLEY.

...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 APRIL INCLUDE:
  25 TO 28 INCHES IN ANCHORAGE...
  28 INCHES NEAR WASILLA...
  20 INCHES NEAR MCCARTHY...
  36 INCHES AT LAKE MINCHUMINA...
  33 TO 37 INCHES ON THE LOWER KUSKOKWIM...
  29 INCHES ON CROOKED CREEK AT THE VILLAGE OF CROOKED CREEK AND
  41 INCHES ON THE KUSKOKWIM AT CROOKED CREEK...
  25 TO 31 INCHES IN THE FAIRBANKS-MIDDLE TANANA BASIN AREA...
  40 INCHES AT EAGLE...
  24 INCHES AT GALENA...
  32 INCHES AT PILOT STATION...
  34 INCHES ON KOTZEBUE LAKE...
  37 INCHES ON THE SELAWICK RIVER...
  20 INCHES AT BETTLES...
  AND 48 INCHES AT COLVILLE VILLAGE.

...LONG RANGE...

THE 6 TO 10 DAY TEMPERATURE OUTLOOK HAS INCREASED PROBABILITIES OF
ABOVE NORMAL TEMPERATURES OVER MUCH OF THE WESTERN MAINLAND AS WELL
AS OVER MOST OF THE NORTH SLOPE AND BROOKS RANGE.  THERE ARE
INCREASED PROBABILITIES OF BELOW NORMAL TEMPERATURES OVER MUCH OF
SOUTHCENTRAL AND THE SOUTHEAST MAINLAND... AND OVER THE NORTHERN
THIRD OF THE PANHANDLE.

THE 6 TO 10 DAY PRECIPITATION OUTLOOK HAS INCREASED PROBABILITIES OF
ABOVE NORMAL PRECIPITATION OVER MOST OF THE MAINLAND.  NEAR NORMAL
PRECIPITATION IS LIKELY OVER PART OF THE SOUTHEAST MAINLAND AND OVER
MOST OF THE PANHANDLE.

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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