Global warming harbinger
Event Earlier spring arrival

Nenana, Alaska

Early river thaw. During 82 years on record, four out of the five earliest thaws on the Tanana River occurred in the 1990's.

Reference: NSIDC. 1998. The Nenana Ice Classic: Tanana River Ice Annual Breakup Dates. National Snow and Ice Data Center. Digital data available from nsidc@kryos.colorado.edu. Boulder, Colorado. NSIDC Distributed Active Archive
Center, University of Colorado at Boulder. http://www-nsidc.colorado.edu/
NASA/GUIDE/docs/
dataset_documents/
nenana_river_ice_breakup_
dataset_document.html

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