Public Information Statement
Issued by NWS Fairbanks, AK

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NOAK49 PAFG 092132

Public Information Statement
National Weather Service Fairbanks AK
132 PM AKDT Sun May 9 2021

...Green-Up in Fairbanks Today...

Green-up occurred this morning, May 9th, in Fairbanks, as seen by
viewing Chena Ridge from UAF West Ridge. Last year, green-up
occurred on May 10th. The earliest green-up on record was April
26, 2016. The latest green-up on record was May 26, 2013. The
average green-up date since records began in 1974 is May 8th.

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 leafing out in just a day or two. Green-up
occurs earliest on the lower slopes of south facing hillsides,
spreading rapidly down to the valley floor and more slowly
upslope. This event is important meteorologically because evapo-
transpiration rapidly increases, resulting in increased boundary
layer water vapor content. This is often apparent in increased
dewpoints in otherwise similar meteorological conditions on either
side of green-up.

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