The combination of dry air, dry ground and generally clear skies will deliver some mighty chilly nights through the middle of the week around the Great Lakes.
The high pressure system moving in is not especially cold.
However, the pattern is just enough, when combined with the dry state of the ground, to allow nighttime temperatures to dip into the lower 40s and even the upper 30s in a few locations through the middle of the week.
The good news is that it will not get cold enough for frost in 99.9 percent of the area.
According to Agricultural Meteorologist Dale Mohler, "Even in the coldest spots of northern Michigan, Wisconsin and Minnesota, where frost occurs, it will not be cold enough, long enough for significant damage."
The weather the next couple of days will be less than ideal for swimming activities. Even though high temperatures will be in the 70s over much of the area, the dry air and high evaporation rates may have you feeling chilled as soon as you get out of the water.
One thing is for sure, folks over the Upper Midwest will not need their air conditioners or fans on the next couple of nights and the pattern will be nearly ideal for manual laborers.
However, while you may not perspire much laboring in weather like this, you should drink plenty of water, as you can still get dehydrated.
Some people who mind the cool weather may need a jacket or long sleeves for the first couple of hours in the morning and during the evening.
Moisture in the air and the ground insulates against big swings in temperature, especially at night. When the moisture is absent, the landscape and nearby air behaves more like a desert.
While this particular dry air mass will not support the typical heat which occurs in the deserts during the day, the lack of moisture will allow the temperature to plummet at night, just like the desert.
Temperatures and humidity levels are forecast to rebound to seasonable levels later in the week and over the coming weekend. As both increase, so will the risk of shower and thunderstorm activity.
Much of the Corn Belt is in need of rainfall in the coming weeks with the approach of the pollination.
The pollination period has been moved up by several weeks this season, due to the unusual warmth spurring rapid growth and early planting of the corn during the spring.
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Showers will return early in the week with milder, drier weather is in store for the weekend.
With below-average temperatures in recent weeks, Detroit will see warmer, milder weather as temperatures begin to rise early next week.
After a brief bout with cooler air over the weekend, temperatures will rise back into the 40s early next week.
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8.0" of snow.
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A wind gust of 207 mph recorded.
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Tornado killed 49 and caused $600,000 worth of property damage.