WeekendSeptember 14th, 2013 at 9:28 am by Bill Steffen under Bill's Blog, Weather
This is a grab from the Muskegon GLERL camera at the Channel Saturday around 9 AM. There were already a few boats out. Saturday was the brighter half of the weekend, with clouds and some scattered showers developing today (Sun.). Monday and part of Tuesday should be mostly sunny and pleasant. Look for warmer temps. (low 80s perhaps) Weds. and Thurs. with scattered showers and a possible thunderstorm. More cool fall-like air will move in for next weekend.
Low temps. Sat. AM: 27 Spincich Lake (U.P.) and Leota (Clare Co.), 28 Baldwin, 30 Leslie, Houghton Lake, 31 Cadillac, Wellston (Manistee Co.), 32 Kalamazoo Nature Center, Pellston, 33 Reed City, 34 Alma, Manistee, 35 Big Rapids, 36 Hart, Hopkins, Belding, 37 Fremont, Coldwater, Mt. Pleasant, Benton Harbor, Sturgis, 38 Holland, Jackson, Marshall, Ludington, Hastings, Albion, 39 Muskegon, Lansing, S. Haven, Ionia, Three Rivers, Hudsonville, Fennville, 40 Kalamazoo (airport), East Grand Rapids, Allendale, 41 Grand Rapids (airport), Battle Creek.
Note the difference between the low temperatures at the Kalamazoo Nature Center (32) and the Kalamazoo Airport (40). There can be a significant difference in low temperatures on a calm, clear night over a short distance. If you were planting a frost-sensitive crop, you might locate your farm by the airport instead of the Nature Center to get a longer growing season. It might affect how you would landscape your yard. The location of the weather station affects the climate record. It used to be that weather stations were in more rural areas. Weather stations were moved to airports, because pilots needed weather data. The State Climatologist of Michigan said that Michigan is about one degree warmer than it was 100 years ago, and that much of the difference was on clear, calm nights. You can see why moving an official weather station from a location like the Nature Center to the Airport would account for much of that difference. Also, the National Weather Service changed their temperature reporting from liquid in glass (mercury, alcohol) thermometers to MMTS. Read about it here (article from the Past President of the American Assn. of State Climatologists). The MMTS thermometers required electricity. So, quite a few weather stations were moved near buildings, because that’s where the electricity was available. That change can also result in warmer temperatures both in the daytime and at night. On a calm, clear night, cool air will settle to the lowest spot, so valleys will get a little colder than hilltops. That’s why orchards aren’t planted in river valleys, but are on higher land, where the coolest air can drain away. The apple orchards of Kent Co. are on “The Ridge” and that is even the name of roads in the area (Fruit Ridge Rd., Peach Ridge Rd.). Enjoy your weekend!