Lake Michigan Water Level Up 3″April 18th, 2013 at 7:36 pm by Bill Steffen under Bill's Blog, News, Weather
NOTE: Mark Walton (Hydrologist for the GRR NWS) has lowered the expected crests on the Grand River a “little bit”. If anything, with no significant precipitation over the next 3 days, the forecast levels may still be just a touch high. In any case, significant flooding is occurring. Watch 24-Hour News 8 for the latest. I am supposed to do weather at the Grand River by the Ford Museum at 5 and 6 pm. That will depend on network coverage of the . Nice sunset for parts of W. Michigan last night. The heavy rain over the past week has boosted the water level of Lake Michigan/Huron by a whopping 3 inches in just the past week. Since each inch represents 390 billion gallons of water, that’s an increase of 1.17 trillion gallons of water on Lake Michigan in just 7 days! Most of this increase is rain that fell into the lake (some runoff increase, lower evaporation with the wet weather and there was still a little ice in the Great Lakes – Green Bay is just breaking up now). Lake Michigan is now 10″ below the water level of one year ago, 24″ below the April average and 6″ above the low water mark of April 1964. With high to record water levels on rivers in Lower Michigan, the water level should see a nice increase in the next two weeks. Lake Superior is up one inch in the past month, 4″ below the level of one year ago and 13″ below the April average. However, with the cold spring, much of the snow along the Lake Superior shore hasn’t melted yet. Here’s snow depth reports from Thurs. AM: 45″ Hoist Basin (to melt all that snow by May 1, they’d have to melt off 3.5″ per day each day the rest of this month!), 41″ Big Bay, 32″ Marquette Co. Airport and 10 miles south of Grand Marais, 29″ Twin Lakes (see link – plenty of ice left on the lake) and 2 mi ESE of Houghton, 24″ Munising, 16″ Newberry, 12″ Ironwood and 11″ S. Ste Marie. ALSO, there getting ANOTHER SNOWSTORM in the U.P. Winter Storm Warnings are out from Marquette Co. west into Minnesota for 6″ or more of snow. They even say: “LOCALLY HIGHER AMOUNTS UP TO 17 INCHES ARE POSSIBLE NEAR LAKE SUPERIOR”. Wow! How’s that for the 3rd week of April!
Lake St. Clair is up 9″ in the last month. Lakes Erie and Ontario are each up 7″ in the last month. It’s seldom you see increases like that in just a month’s time. Lake Erie is still 5″ below the average April level and Lake Ontario is 4″ below the April average. I think those deficits get erased in the next few weeks. (pic. from “bobbinrobin” at ReportIt) ADD: Video of the Rogue River at the Rockford Dam from Stacy N.