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Boston Weather: 55.0°F | Overcast


Ernesto on the way to Cambridge?

Jon Moskaitis

Usually I write about tropical cyclones in this space only as an interesting diversion to a stretch of uneventful local weather. However, this is not the case today, as the remnants of Hurricane Ernesto have a very important role to play in this weekend’s forecast. Ernesto crossed the Carolina coastline last night on a northeast heading, but now finds a strong high pressure system squarely in its path. The high is expected to turn Ernesto north and eventually northwest, towards the Great Lakes. East of Ernesto’s track, moist southerly flow will push up and over the leading edge of the high pressure system, producing copious amounts of rainfall. The amount of rain that can make it to Cambridge and the timing of its arrival are both very uncertain, due to uncertainties in Ernesto’s track. The most likely scenario is that the rain will primarily stay to our southwest, with some showers making it here on Saturday night and Sunday. It is also possible, but less likely, that there will be no rain at all. Finally, there is a slight chance of a total deluge. This is a forecast where the uncertainty is much greater than usual, so keep up to date with the latest predictions online.

Extended Forecast

Today: Mostly sunny. High 67 F (19 C)

Tonight: Clear and cool. Low 57 F (14 C)

Saturday: Windy and cool. High 60 F (21 C)

Saturday night: Showers likely, windy. Low 57 F (14 C)

Sunday: Mostly cloudy and windy, with showers likely. High 68 F (20 C)

Monday: Partial clearing, some showers still possible. High 76 F (24 C)