The Coast Guard is urging people to use extreme caution on and near waterways ahead of warmer temperatures this weekend.

The above-freezing temperatures could pose safety concerns throughout Lake Michigan and inland rivers, streams and ponds that have become frozen during the past few weeks.

Rising temperatures will cause recently-frozen waters to further melt and become weak.

Ice is unpredictable and the thickness can vary, even in small areas. Water currents, particularly around narrow spots, bridges, inlets and outlets, are always suspect for thin ice. Stay away from cracks, seams, pressure ridges, slushy areas and darker areas since these signify thinner ice.

In addition, ice near the shore of a frozen lake may be unsafe and weaker because of shifting, expansion, and sunlight reflecting off the bottom.

A majority of Coast Guard units around Lake Michigan have winterized their rescue boats and as a result, the Coast Guard has a reduced capability to respond to anyone in distress on the water.

The Coast Guard is also urging people to remain clear of shorelines, piers, jetties, rocks, walkways and jogging paths that may have become covered in layers of ice.