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I heard that the Chesapeake Bay and its tributaries were starting to ice over. I've also seen on TV mention of using tug boats or icebreakers to keep a shipping lane open for commercial vessels. The water temperature, according to the evening news, has been around 33 degrees. I decide to check for myself and went to the boat ramp at Harbor Hospital. This was shot with my new iPod Touch 4G and processed with Adobe Premiere Elements 8.

http://http://www.youtube.com/watch?v=yrOLuciAsqo
 

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Not sure why but the Patapsco remains free of ice most winters.

One theory tossed around is the warm water discharges combined with lots of commercial traffic.

Water is most dense at 38* - big ships can draw 30 feet and stir this deeper ( warmer ) water towards the surface.

Few years ago - I stopped by Harbor hospital ramp around 3:00 in afternoon. It was ice free but very windy and cold.
Next morning - no wind but ice out for 1/4 mile. We launched and slowly crunched through it.

This weekend is predicted to be very cold , windy so same thing could happen.
 
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