Ice-out Watch 2008 (false & true colours) - April 16

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Satellite image of ice break-up, 2008

Satellite image of ice break-up, 2008

Posted Tuesday, Apr 17, 2008                                                                         Photo: NASA/NOAA

Big heat, big melt

Yesterday the temperature jumped to 15 C, and did not drop below freezing overnight for the first time.

The snow melt on the ice was dramatic as the dark blue indicates, and thinning has progressed.

At this time of the year, interpreting the image can be tricky. It helps to compare with the true-colour image below. Only Lake Nipissing shows more small open water, and that is negligible.



False colour, like infrared, enhances the view of ice and snow.


Black open water or thin, clear ice
Dull/ dark blue thin ice
Bright turquoise thick ice, or snow on unforested land  (e.g. clearcuts, farmland)



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