It’s not very often, even in this northerly climate, that we find ourselves below zero in the month of March, but that’s exactly what happened this morning in a large part of our viewing area. With fairly fresh snowcover, dry high pressure in charge and clear skies overhead, our temperatures took a nosedive early in the predawn hours, settling in the single digits below zero between Rochester, Faribault, and Mason City. The official morning low in the Rochester was -4 degrees, the first subzero March temperature in fours! Not only was is cold, but there was some thick fog as the temperature dropped all the way to the dew point level, so visibility was a concern in some spots before 8:00 am. Because it was a freezing fog, there was also the concern for extra ice depositing on the roads and sidewalks. Some of that ice deposition was visible this morning in the form of “hoarfrost.” It’s actually fairly common to see that this time of the year as moisture becomes more prevalent in the atmosphere with the melting of snow and under clear skies at night.
This post was written by tschmidt on March 7, 2013