Small Craft Advisory 199, NWS Fairbanks, AK

NORTHERN ALASKA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE FAIRBANKS AK
1124 PM AKST WED DEC 11 2013

.DISCUSSION...

UPPER AIR...
AN UPPER LOW CENTERED OVER THE KUSKOKWIM VALLEY IS PROGGED BY
CURRENT MODELS TO BECOME AN ELONGATED CENTER EXTENDING FROM
BRISTOL BAY NORTHEASTWARD ACROSS THE INTERIOR BY FRI MORNING. BY
SAT MORNING THE LOW PRESSURE CENTER WILL BECOME RE-ORIENTED TO
EXTEND SOUTH- NORTH ACROSS THE WESTERN INTERIOR THEN NORTHEAST TO
THE MACKENZIE DELTA REGION. THE MAIN CENTER WILL DEEPEN AND MOVE
INTO THE NORTHERN GULF OF ALASKA BY SAT EVENING. HIGH PRESSURE
RIDGING WILL PERSIST OVER EASTERN SIBERIA...CHUKCHI SEA...AND
BEAUFORT SEA. A MODERATELY COLD AIR MASS WILL REMAIN OVER THE
NORTHERN ALASKA MAINLAND.

SURFACE...
EXPANSIVE 1040 MB HIGH PRESSURE WILL PERSIST OVER EASTERN SIBERIA
THROUGH FRI NIGHT...BUT WEAKENING SOME. 1044 MB HIGH CENTERED
NEAR BARROW WILL WEAKEN CONSIDERABLY BY FRI. 987 MB LOW OVER
THE NORTHEAST GULF OF ALASKA WILL WEAKEN INTO A TROUGH OVER
THE NORTHERN GULF OF ALASKA BY LAT THU NIGHT. THE STRONG PRESSURE
GRADIENT OVER NORTHERN ALASKA SOUTH OF THE BROOKS RANGE WILL
WEAKEN SOME BEGINNING LATE FRI NIGHT AS THE HIGH AND LOW PRESSURE
CENTERS WEAKEN. BLUSTERY NORTHEAST WINDS WILL CONTINUE OVER MUCH
OF NORTHERN ALASKA SOUTH OF THE BROOKS RANGE THROUGH THU NIGHT. BY
LATE FRI NIGHT...A STRONGER SURFACE LOW WILL MOVE NORTHWARD TO
NEAR PRINCE WILLIAM SOUND...CREATING A TIGHT PRESSURE GRADIENT
ALONG AND SOUTH OF THE ALASKA RANGE. THIS LOW ALONG WITH SOUTHERLY
FLOW ALOFT WILL PUMP MOISTURE INTO THE EASTERN INTERIOR. SNOW IS
EXPECTED TO DEVELOP IN THE EXTREME SOUTHEAST INTERIOR AND EASTERN
BROOKS RANGE FRI EVENING... SPREADING NORTHWARD AND WESTWARD
ACROSS THE EASTERN INTERIOR THROUGH SAT AND CONTINUING INTO SUN.

COASTAL HAZARD POTENTIAL DAYS 3 AND 4...NONE

&&

.AFG WATCHES/WARNINGS/ADVISORIES...
WINTER WEATHER ADVISORY FOR AKZ219-AKZ220-AKZ221-AKZ222.

HEAVY FREEZING SPRAY WARNING FOR PKZ210-PKZ220-PKZ225.

SMALL CRAFT ADVISORY FOR PKZ210.

BRISK WIND ADVISORY FOR PKZ200.
&&

RF DEC 13