Hydrometeorological Discussion
Issued by NWS Alaska-Pacific RFC

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AGAK78 PACR 242237
HMDACR

HYDROMETEOROLOGICAL DISCUSSION
NWS ALASKA PACIFIC RIVER FORECAST CENTER ANCHORAGE AK
300 PM AKDT SUN MAY 24 2015

...FLOOD POTENTIAL...

A FLOOD WARNING IS IN EFFECT FOR FORT YUKON ON THE PORCUPINE RIVER.
A FLOOD WATCH FOR THE PORCUPINE RIVER HAS BEEN UPDATED TO INCLUDE
THE REACH FROM THE MOUTH OF THE PORCUPINE RIVER TO THE MOUTH OF THE
COLEEN RIVER UNTIL SUNDAY EVENING. VERY WARM TEMPERATURES HAVE
DRAMATICALLY INCREASED SNOW MELT...RESULTING IN BANKFULL OR OVER
BANKFULL CONDITIONS. WATER LEVELS NEAR THE NORTH SIDE OF VILLAGE OF
FORT YUKON HAVE BEEN NEARLY STEAD FOR THE LAST COUPLE OF DAYS.

WATER IS FLOWING OVER PORTIONS OF THE DALTON HIGHWAY BETWEEN
MILEPOSTS 394 AND THE DEADHORSE AIRPORT. THE ROAD REMAINS CLOSED
BETWEEN MILE 334 AN 413 AND IS EXPECTED TO REMAIN CLOSED THROUGH
NEXT WEEK.  A FLOOD WARNING HAS BEEN ISSUED UNTIL 415 PM SUNDAY.
SINCE WEDNESDAY WATER LEVELS IN THE VICINITY OF THE DEADHORSE
AIRPORT HAVE DROPPED.

PLEASE NOTE THAT EVEN THOUGH A RIVER REACH MAY BE LABELED OPEN OR
MOSTLY OPEN... IT IS STILL POSSIBLE FOR ICE RUNS FROM UPSTREAM TO
PASS THROUGH THESE REACHES AND MAKE TRAVEL UNSAFE.

FOR MORE UP-TO-DATE BREAKUP INFORMATION... PLEASE VISIT:
HTTP://APRFC.ARH.NOAA.GOV/DATA/MAPS/BRKUP_MAP.PHP. AND PLEASE REFER
TO THE WATCH... WARNING... AND ADVISORY PRODUCTS FOR MORE
INFORMATION.

...HYDROMETEOROLOGICAL DISCUSSION...

A LARGE BERING SEA LOW HAS DEVELOPED IN THE CENTRAL BERING SEA WHILE
A ANOMALOUSLY STRONG RIDGE REMAINS FIRMLY IN PLACE OVER THE EASTERN
PACIFIC THAT EXTENDS UP INTO WESTERN CANADA. GOOD MODEL AGREEMENT
KEEPS THIS PATTERN GOING WELL INTO NEXT WEEK WITH RE-ENFORCEMENTS OF
THE LOW IN THE BERING COMING ON TUESDAY. COOLER AND WETTER
CONDITIONS SPREAD ACROSS THE CENTRAL MAINLAND AS SHORT WAVE ACTIVITY
BEHIND THE OCCLUDED FRONT KEEP THE THE THREAT OF SHOWERS EARLY THEN
A MORE CONVECTIVE REGIME DEVELOPS BY MID-WEEK ESPECIALLY ACROSS THE
INTERIOR AND NORTH SLOPE

...PRECIPITATION...

PRECIPITATION TOTALS OVER THE 24 HOURS ENDING AT 4 AM TODAY:
LOCATION NAME                 PE TS   24 HR
======== ====                 == ==   =====
MCPA2    MCARTHUR PASS        PP RG :   1.23
PEDA2    PEDERSEN LAGOON      PC RG :   0.86
PSJA2    PORT SAN JUAN        PC RM :   0.80
UNRA2    UPPER NUKA RIVER NR  PP RG :   0.60
YESA2    MOUNT ALYESKA SNOTEL PC RM :   0.50
WRYA2    WEARY LAKE           PC RM :   0.50
ESIA2    ESTHER ISLAND        PC RM :   0.50
PAVC     KING COVE            PP RZ :   0.48
SVRA2    SILVER SALMON LAKES  PP RG :   0.42
SNTA2    SAND POINT CRN       PP RG :   0.40
KCKA2    KACHEMAK CREEK       PC RM :   0.40
PAWD     SEWARD               PP RZ :   0.38
PATO     PORTAGE GLACIER      PP RZ :   0.35

...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
BELOW NORMAL PRECIPITATION OVER MOST OF SOUTHEASTERN MAINLAND AND
THE PANHANDLE OF ALASKA.

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

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

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
$$

ETH



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