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February to June, 2002

Ice-Out

Background
Is this spring the warmest in recorded history? Or is it the coolest? We often hear weather announcers discuss these things. How could you compare spring's arrival from year to year? What could you measure?

In northern regions of North America, the melting of ice cover on lakes, rivers, ponds and oceans is a welcome sign of spring. This event is known as "ice-out," and ice-out dates are an accurate way to measure spring's pace from year to year.

How to Participate in the Ice-Out Study

Report the Ice-Out Date of Your Local Waters to Journey North

Here's What You'll Do:

  • Adopt a frozen body of water near you. You may choose a lake, pond, river, stream, bay, estuary--or even an ocean.

  • Report back to us when ice-out occurs. (We define "ice-out" as the time the body of water is 90% free of ice.)

Predict the Arrival of Spring
Official 2002 Ice-out Observation Posts

Strategically placed across the Northern Hemisphere, these 6 official sites will monitor the ice-cover in their local waters. Guess when you think the ice will melt at each of these places.

Ice

Location

Lat/Long

Chukchi Sea Point Hope, Alaska 68.5 N,
166.80 W
Tanana River Nenana, Alaska 64.5 N,
149.0 W
Hudson Bay Rankin Inlet, NT 62.60 N,
93.50 W
Lake Minnetonka Minneapolis, Minnesota 44.95 N,
93.54 W
Walden Pond Concord, Massachusetts 42.25 N,
71.25 W
River Teno Utsjoki, Finland(Lapland) 69.883 N,
27.017 E

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