Scientific Forecaster Discussion
Northern Alaska forecast discussion
National Weather Service Fairbanks Alaska
257 am akst Wednesday Dec 11 2013
current models indicate a deepening trough over the
southern Alaska interior...upper low center developing
over the central Alaska Range this afternoon...then
deepening over the southwest interior by early Thursday.
High pressure aloft will persist over eastern Siberia
with a ridge extending eastward across the Beaufort
Sea. A moderately cold air mass will persist over
most of northern Alaska...850 mb temperatures mainly
in the range of -15c to -25c.
At the surface...strong high pressure over the Arctic
coast and Beaufort Sea will persist through Thursday morning...
then gradually weaken. A low pressure center over the
northeastern Gulf of Alaska will move to the northern
Gulf of Alaska Thursday while weakening slowly. A strong
pressure gradient will persist over the interior through
Thursday...weakening some Thursday night. North winds gusting to
30 miles per hour will continue through central and eastern Brooks
range passes through Thursday...causing locally poor
visibility in blowing snow.
Snow is expected to develop over the southeast interior
and eastern Brooks range Friday afternoon as a southerly
return flow aloft and another surface low moving into the
northern Gulf of Alaska pump moisture northward. By Sat
afternoon...snow is expected to spread northward over most
of the southern and eastern interior zones.
Coastal hazard potential days 3 and 4...none
Winter Weather Advisory for akz206-akz218-akz219-akz220-akz221-
Heavy freezing spray warning for pkz210-pkz220-pkz225.
Small Craft Advisory for pkz210-pkz220-pkz225.
Brisk Wind Advisory for pkz200-pkz230-pkz245.
Rf Dec 13