Wednesday, March 16, 2011

Slow melt helps

We're experiencing only gradual melting, which should help with flooding on major rivers in the area. We're seeing our first 50-degree temperatures today, and tonight may be the first night without below-freezing temperatures in many months. That will hasten runoff and push rivers up, but cooler weather is returning in a few days.

River ice may be an issue. The St. Croix is rising and there is water over the ice at Hudson, suggesting river ice is still pretty solid and holding fast to the shoreline. If the rivers rise very fast, the ice will break up while still fairly solid, increasing the risk of ice jams.

As recently as Friday, Mississippi River ice on Lake Pepin was largely in excess of 19 inches of blue ice (blue ice is the hard stuff).  This won't break up easily anytime soon.

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