Recent cold weather in the Rochester area has led to ice formation on lakes and ponds, but upcoming warmer temperatures and rain are raising concerns about ice stability. Officials caution that even seemingly solid ice can quickly become unstable with rising temperatures. Slushy ice is significantly weaker than clear ice, and repeated thawing and refreezing cycles can create weak, spongy ice. Snow-covered ice may also be thinner due to its insulating properties. The New York State Department of Health advises that clear, bluish ice requires at least 4 inches to support an average person's weight.