GRAND RAPIDS, Mich. (WOOD) — We've seen three separate "heat waves" in West Michigan already this summer, and there are more 90s are on the way.
The polar jet stream continues to retreat into Canada this summer, allowing warm to hot air to flood into West Michigan. In summertime, the polar jet stream usually stays north of West Michigan, but its placement has been especially extensive this year.
There have been 11 90-degree days so far this year: three in May, four in June and four so far in July. We usually see only eight days over 90 degrees.
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