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Boston Weather: 46.0°F | A Few Clouds

Weather: Ushering in Autumn

By Greg Lawson
STAFF METEOROLOGIST -- Gear up for more rain. A tight cold front sandwiched between two highs is approaching from the west. The southerly flow on our side of the front, caused by the high to our east out over the ocean, will help bring sub-tropical air associated with Tropical Storm Harvey up north. This extra moisture added to the rain already associated with the front will help keep a thicker cloud cover than expected and perhaps give even heavier precipitation. If there is enhancement of precipitation, then there is the chance of local flooding with rivers already quite full thanks to Floyd’s remenants. However, the current thinking of the National Weather Service is that we will remain safe. In any case, the rain will begin sometime late this afternoon. It could be heavy at times though there may be one or two breakcycles through the night as the storm loses coherence. The rain will taper off to light showers by tomorrow morning and be pushed-out to sea by early afternoon with the passing of the cold front. Once the front passes we will be left within an unseasonably cool, dry airmass shielded by a large, weak high. It’ll feel quite like fall -- remember the Autumnal Equinox is at 8:31 a.m. on Thursday. Temperatures will then slowly and steadily rise through the rest of the week, taking us back to normal conditions by Friday.

Today: Overcast with rain this afternoon. Moderate southerly winds. High 65° F (18° C).

Tonight: Continued rain. Winds weakening and shifting to easterly. Low 52° F (11° C).

Wednesday: Light showers in the morning giving way to clear skies. Cool with a high of only 61° F (16° C). Low of 50° F (10° C).

Thursday: Cool and clear. Temps slowly rising. Light winds. High in the mid to upper 60s (18-20° C). Low in the low 50s (10-12° C).

Friday and Beyond: Normal temps resume. Rain indicated but it’s still too early to tell for sure.