A shifting weather pattern is set to bring heavy rain, scattered thunderstorms, and the risk of flash flooding across New England from Tuesday afternoon through Thursday, according to meteorologist Dave Epstein.
An upper-level trough moving over the region will generate an unusually strong surface low-pressure system for this time of year.
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Rainfall totals could exceed two inches in parts of Southern New England by late Thursday.
Highest Flood Risk Areas
Weather models indicate that Western and Central Massachusetts, along with Connecticut, face the greatest threat of flash flooding and urban street flooding.
Rising moisture levels will cause dew points to increase rapidly, creating conditions for sudden heavy downpours.
Precipitation timing will vary by location.
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Western Massachusetts and areas north and west of Interstate 495 could see showers as early as Tuesday evening.
Southeastern Massachusetts is expected to remain mostly dry until Wednesday.
Travel disruptions are likely to peak mid-week, with the Wednesday evening commute facing the highest probability of heavy rain and hazardous conditions.
Commuters on Tuesday and Wednesday morning are unlikely to encounter significant weather issues.
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Shower activity will persist into Thursday before conditions dry out heading into the weekend. However, forecast models suggest another wave of rain could return by Sunday.
