Active Weather
Storms crossed the region overnight and more are possible this afternoon, though forecasters are unusually candid about how uncertain the second round is.
The Storm Prediction Center's outlook for Friday places a marginal risk of severe thunderstorms across the Great Lakes, with Chicago, Detroit, Indianapolis, and Columbus among the named population centers. A marginal risk is the lowest of five steps and means isolated severe storms are possible rather than expected. Ohio also sits at the eastern edge, closer to the slight risk area centered over the upper Ohio Valley.
The hazard mix here is different from the one further east. Forecasters describe strong instability building through Friday afternoon, with the atmosphere holding a great deal of available energy, but weaker upper level winds than on recent days. That combination favors large hail and damaging wind from any storm that manages to get going, rather than organized lines. Whether storms get going at all is the open question: a building ridge aloft is capping the atmosphere, and the outlook says plainly that the timing and location of development remain highly uncertain.
Illinois holds nine active National Weather Service alerts this morning, Indiana and Wisconsin six each, Minnesota and Ohio two each. Michigan does not appear among the states carrying land based alerts.
For households this is a normal late summer afternoon with an asterisk. Hail is the hazard that most often surprises people here, and the response is simple: if storms develop, park under cover if you have it. Do not drive into water across a road, which is the National Weather Service's Turn Around, Don't Drown guidance.
Infrastructure
No large uncontained wildfires are burning in the region. Nationally the wildfire preparedness level stands at 5, its highest step, with 84 large uncontained fires and 20,245 personnel assigned. The year to date total is 52,626 fires and 8,265,751 acres, which is 126 percent of the ten year average for fires and 163 percent for acres. Those figures come from the National Interagency Fire Center report dated September 2, so they are one to two days behind this morning.
No grid emergencies or water system disruptions are reported across the six states this morning. Overnight storms in northern Wisconsin and Lower Michigan may have produced scattered outages, which utilities generally restore within hours.
If wind takes your power out and you run a generator, operate it outdoors only, at least 20 feet from the house, with the exhaust pointed away from windows, doors, and vents. Working carbon monoxide alarms belong on every level of the home and outside sleeping areas, and they should be tested monthly. If a carbon monoxide alarm sounds, get outside first, then call 911. That guidance is the Consumer Product Safety Commission's.
Public Health
No public health advisories specific to the Great Lakes were confirmed this run. The Centers for Disease Control and Prevention's Health Alert Network archive could not be read this run, so this brief makes no claim about national health advisories in either direction.
Watch Item
The front that has been sitting across the region breaks down over the weekend as a surface low develops over the northern High Plains and pulls it northeast. The Weather Prediction Center's medium range discussion points to widespread showers and thunderstorms with locally heavy rain becoming more likely across the northern Rockies, the northern Plains, and the upper Midwest late this weekend into early next week. That is the next organized system for this region, and it is several days out.
The seasonal note is worth flagging early rather than late. The Great Lakes region's dominant hazard shifts over the next eight weeks from thunderstorms to wind, cold, and the first winter storms, and the practical hinge is heating. Whatever heats your home is easier and cheaper to have serviced in September than in November, and a furnace inspection booked now is a furnace inspection that actually happens before the first cold night.
Two related items belong in the same September afternoon. Carbon monoxide alarms are worth testing at the start of heating season rather than in the middle of it, and any alarm older than its manufacturer's replacement date should be replaced rather than tested. Generators, if you own one, run better for having been started and load tested before the season when you need them.
Drought remains a background variable rather than an active one here. The United States Drought Monitor released a new map on September 3 with data valid September 1; the national percentage could not be read from the site this run and is not quoted.
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