Widespread Rain Expected, Flash-Flood Risk

The first round of rain is expected to begin between 10 p.m. and midnight, with precipitation initially more organized north of I-90 before becoming more scattered as it shifts south Thursday morning; showers may end by 6–8 a.m. Thursday.
Thursday temperatures in the rain-affected area are forecast to reach only the low 70s, after overnight lows in the upper 50s and lower 60s.
In the Boston-area outlook, clearing is expected Monday, followed by cooler weather Tuesday and another chance of showers Wednesday; the forecast maps are based on automatically updated raw model data and may change.
The hot, humid region also faces a 55% chance of isolated thunderstorms Wednesday and Thursday. Any storm could produce a brief downpour and gusty wind, although forecasters do not expect an all-day rain event.
Ragweed levels are reported as very high, while grass, mold and tree pollen are low; overnight temperatures are expected to remain warm, with a low near 73 degrees Wednesday night.
A potent rain system will drench much of the region Friday, with 2 to 5 inches of rainfall expected and a significant Click on Detroit flash-flood risk in place. The first round of rain begins between 10 p.m. and midnight, initially organized north of I-90 before scattering as it moves south Thursday morning. Showers should end by 6–8 a.m. Thursday, dropping temperatures to the low 70s across rain-affected areas.
Rain arrives between 10 p.m. and midnight, with the heaviest precipitation initially concentrated north of I-90. As the system shifts south Thursday morning, rainfall becomes more scattered, and showers taper off by 6–8 a.m. Thursday overnight lows in the upper 50s and lower 60s will give way to daytime highs in the low 70s for rain-impacted communities Click on Detroit.
Boston-area residents will see Thursday showers clear out by Friday, with mostly sunny skies expected Saturday. Sunday brings another chance of rain, followed by clearing Monday and cooler weather Tuesday. Wednesday may see showers return to the region. Overnight temperatures will remain warm, with lows near 73 degrees Wednesday night across the affected zone Click on Detroit.
A separate zone faces dangerous heat and humidity through Friday evening, with highs near 94 to 95 degrees and heat-index values climbing as high as 107. A 55% chance of isolated thunderstorms exists Wednesday and Thursday. Any storm could bring a brief downpour and gusty wind, though forecasters do not expect an all-day rain event. Ragweed levels are very high, while grass, mold, and tree pollen remain low Click on Detroit.
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