The Daily Parker

Politics, Weather, Photography, and the Dog

More winter photos

If the forecast holds, today will be the 15th of 16 straight days of below-freezing temperatures, and the 19th consecutive day with 30+ centimeters of snow on the ground. On Sunday, though the temperature will just barely break the freezing point (1°C predicted), this winter will move from 5th to 4th place in history on that last statistic. Officially O'Hare has 46 cm of snow right now, and until Tuesday's predicted mostly-sunny 6°C, not a lot of that will melt. (The last time we had this much snow on the ground for three weeks was the 25-day period ending 12 January 2001, which sounds impressive until you realize I remember very clearly the 46-day stretch of 30+ centimeters of snow that ended 28 February 1979.)

It has some aesthetic appeal, though:

And then we have this, along the north wall of my apartment building (and thus never to get direct sunlight), the result of 40 centimeters of snow on the roof:

So, if you do a little math, 40 cm of snow * 102 square meters of roof served by that downspout = 41 cubic meters of snow, which at 10:1 water content makes 4.1 cubic meters (yes, that's 4.1 tons, or 4,100 liters). If only one centimeter of snow melts, 410 liters of water will cascade off the roof, and if it's -19°C, it'll re-freeze on its way down. Multiply this times all the roofs in Chicago and you get more than a few collapses. (This is our biennial reminder that the developer who converted our building into condos back in 1996 may have skimped a little on insulation between the top-floor units and the roof.)

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