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NOAK49 PAFG 142333
PNSAFG
AKZ844-151145-
PUBLIC INFORMATION STATEMENT
NATIONAL WEATHER SERVICE FAIRBANKS AK
333 PM AKDT THU MAY 14 2026
..2026 GREEN-UP ON CHENA RIDGE
GREEN-UP ON CHENA RIDGE HAS BEEN VIEWED FROM THE NATIONAL WEATHER
SERVICE FORECAST OFFICE ON THE UAF CAMPUS ON MAY 14, 2026. THE DAY
BEGAN WITH A DEFINITE BROWN HUE TO CHENA RIDGE, BUT THE
TRANSITION TO A SOFT SHADE OF LIGHT GREEN PROGRESSED RAPIDLY
THROUGH THE DAY. BY 3:30 PM AKDT, THE DECISION WAS MADE TO
OFFICIALLY DECLARE "GREEN-UP". LAST YEAR GREEN-UP OCCURRED MAY
10TH. THE CLIMATOLOGICAL MEDIAN FOR THE DAY OF GREEN-UP, FROM THE
PAST 50 YEARS, IS MAY 8TH. THE EARLIEST RECORDED DAY OF GREEN-UP
IN THE LAST 50 YEARS WAS BACK IN 2016 WHEN IT OCCURRED ON APRIL
26TH, AND THE LATEST WAS ON MAY 26, 2013.
GREEN-UP IN INTERIOR ALASKA IS THE SPROUTING OF TREE (BIRCH AND
ASPEN) LEAVES IN THE SPRING. IN MANY YEARS IT IS QUITE ABRUPT, WITH
ENTIRE HILLSIDES "GREENING" UP IN JUST A DAY OR TWO. GREEN-UP OCCURS
EARLIEST ON THE LOWER SLOPES OF SOUTH FACING HILLSIDES, SPREADING
RAPIDLY DOWN TO THE VALLEY AND MORE SLOWLY UPSLOPE.
THIS EVENT IS IMPORTANT METEOROLOGICALLY BECAUSE EVAPO-TRANSPORTATION
RAPIDLY INCREASES, RESULTING IN HIGHER WATER CONTENT IN THE BOUNDARY
LAYER OF THE ATMOSPHERE.
LANEY/CRUZ/SCHLEZINGER/TROYKE
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