Late Summer Heat Persists as Thunderstorms Loom Over Green Bay

Photo byNational Weather Service

Warm days ahead with a chance of thunderstorms this weekend.

Summer Heat Holds, Storms Possible Late Week

GREEN BAY — Issued by the National Weather Service at 2:50 AM CDT on September 17, 2024.

Temperatures Soar in Green Bay

Residents of Green Bay and surrounding areas are set to experience continued summer-like temperatures through Thursday, with highs soaring into the 80s. Those closer to Lake Michigan will see slightly cooler conditions, with temperatures lingering in the 70s. A mild cool-down is expected over the weekend, though temperatures will remain well above the seasonal average.

Dense Morning Fog Near Lake Michigan

Early risers near Lake Michigan should be on the lookout for locally dense fog during the early morning hours. While fog is not expected directly over the lake, light southeast winds are bringing in moisture that combines with nighttime cooling, creating dense fog in lakeshore counties. Inland areas may also see some patchy ground fog, though it will be less dense.

Storms on the Horizon

The calm, warm weather will face a potential disruption starting Thursday night as a weak cold front moves across the area. Showers and thunderstorms are expected to develop with a 40-60% chance of precipitation, and these conditions could persist into Friday. While the exact timing of the rain remains uncertain, there is a possibility of continued stormy weather into the weekend.

Midweek Outlook: Warm and Dry

Forecasts indicate minimal changes in the upper-level weather patterns through Wednesday, with high pressure holding steady over the northeast and a persistent ridge of high pressure over the western United States. Temperatures are expected to peak in the upper 80s, significantly above the averages suggested by some models. Light southeast winds will keep the lakeshore areas slightly cooler, with highs in the mid-70s.

Looking Ahead: Cooling Trend and More Rain?

As the weekend approaches, a gradual breakdown of the current weather pattern is expected, leading to more seasonal temperatures early next week. A closed upper-level low pressure system may form over Ontario by Sunday, resulting in a shift to a more zonal flow across the region. While warm weather will likely continue into the weekend, temperatures are expected to return to normal levels by early next week.

The best chance for rain remains Thursday night into Friday, with a slight possibility of thunderstorms, though severe weather risks are currently low. Forecast models are inconsistent about rain chances on Saturday and Sunday, with some predicting dry conditions while others suggest a better chance for showers on Sunday.

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