Frost AdvisorySeptember 13th, 2013 at 8:21 am by Bill Steffen under Bill's Blog, Weather
Happy Friday the 13th. Saturday early morning we’ll see the coolest temperatures since last May. There is a Frost Advisory in effect for Muskegon, Kent, Ionia and
Clinton Counties to the north. It includes the northern Michigan counties that border Lake Michigan and Lake Huron and most of the eastern 2/3rds of the U.P. We also have a Freeze Warning for Lake, Osceola and Clare Counties to the north, including counties in northern Lower Michigan that do not border Lake Michigan or Lake Huron. There is also a Beach Hazards Statement for the entire Lake Michigan shoreline, though that comes down with lighter winds late tonight and Saturday. The NAM (caribou) gives G.R. a high of 64 today, a low of 38 tonight (it keeps all the airport reporting stations in S. Lower Michigan above freezing at the five-foot level tonight)…then a high of 68 on Saturday. It gives G.R. 0.27″ of rain Sunday into Sunday night. The NAM has temps. only in the mid-upper 50s most of the day Sunday. The GFS plot also gives G.R. a low of 36 Sat. AM with highs of 68 for Sat. and 60 on Sun. The model gives G.R. 0.12″ of rain Sunday/Sunday night and 0.40″ next Weds./Thurs. The GFS take G.R. to the low 80s Weds. and Thurs. for the warmest day of the week. It also has no hard and extensive frost thru the 28th. The European model isn’t quite as cool, with most low temperatures in the low 40s Sat. AM in the city. Here’s the NWS slides on the frost potential. The Euro. give G.R. 0.14″ Sunday/Sunday night and 0.16″ for Weds./Thurs. combined. Temperatures rebound into the 70s next week, but we’re done with 90 and the warmest day next week would be Thurs. with highs in the mid-upper 70s…then back to the 60s next Friday. Saturday will be the brighter half of the weekend, with lots of sun. This is certainly more comfortable weather for football players. At 7 AM the satellite loop shows clouds over Lake Michigan (cold air over the relative warm water of the lake causing lake-effect clouds), over much of N. Lower Michigan and in a band from Hillsdale Co. to the Thumb area. I can see those clouds on the eastern horizon from G.R. The CFS model keeps much of S. Canada and the northern U.S. a little warmer than average to mid-October. Remember, I mentioned the parallels to 2002 when it was warmer than average into mid-Oct…then chilly in late Oct. and Nov. Grand Rapids now 3.5 deg. warmer than avg. for Sept.
Also, the Boulder, Colorado Airport is up to 7.77″ of rain since Monday. Here’s flooding in the Big Thompson Canyon. The Cache Le Poudre River is 4 FEET higher than their previous record. Live Denver radar (still raining Fri. AM). Record flood on the Big Thompson River. Now, this is a flash flood! Discharge on Boulder Creek 80 times average! From weatherunderground: “”Serious floods have affected downtown Boulder in 1894, 1896, 1906, 1909, 1916, 1921, 1938 & 1969″. The heavy rains have spilled east into Kansas, 4.92″ in the past 2 days at Goodland KS. Here’s the latest on Hurricane Humberto and Tropical Depressions Gabrielle and “Ten”.
Low temperatures Fri. AM: 50 G.R., Holland, Muskegon, 48 Battle Creek and Lansing, 47 Fremont, 34 Houghton, 33 Wakefield, 30 Kenton (in the U.P.).