Prognostic Meteorological Discussion
Issued by NWS

Home | Current Version | Previous Version | Text Only | Print | Product List | Glossary On
Versions: 1 2
000
FXAK02 KWNH 291822
PMDAK

ALASKA EXTENDED FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
222 PM EDT SAT AUG 29 2015

VALID 12Z WED SEP 02 2015 - 12Z SUN SEP 06 2015

THE 29/00Z ECENS/GEFS REMAINED IN GOOD AGREEMENT WITH THE
INCORPORATION AND MIGRATION (AND/OR DEMISE) OF A CIRCULATION THAT
WAS ONCE `ATSANI` --- INTO THE MID-LATITUDE NORTH PACIFIC FLOW
PATTERN.

INDICATION IS---THE NORTHERN STREAM DOMINANT-FLOW PATTERN WILL
HOLD FIRM THROUGH THE DAY 8 PERIOD. FOR MOST OF THE ALASKA
FORECAST AREA...AN AIRMASS SOURCE REGION THAT ORIGINATES IN THE
HIGH ARCTIC (NE SIBERIA) WILL MIX WITH `ATSANI` MID-LEVEL
MOISTURE---AND MIGRATE INLAND ACROSS THE SOUTHWEST HALF OF THE
STATE---BEFORE THIS CIRCULATION SHEARS APART AND MIGRATES
DOWNSTREAM ACROSS THE GULF OF ALASKA. THE UPPER-LEVEL PORTION OF
THIS TROUGH MIGRATION WILL GRADUALLY SHIFT EASTWARD...FLATTEN THE
UPPER-LEVEL RIDGE IN THE CENTRAL PACIFIC AND EAST CENTRAL
PACIFIC...AND TEMPORARILY ELIMINATE THE `BLOCKY` PATTERN ALONG THE
DATELINE.

VOJTESAK






$$





USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.