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Boston weather, metro north and west: Fair Saturday, rainstorm arrives Sunday

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High pressure across the Mid Atlantic will give the area a nice Saturday. A developing storm in the Gulf of Mexico will begin its journey up the East Coast by early on Sunday as high pressure moves out into the Atlantic. Then, numbing cold moves into the area by the New Year.

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Today, varying amounts of clouds with a mild southwest flow. Temperatures are expected to break 40 degrees this afternoon. However, gusts to 25 or 30 mph at times will keep it cooler than the actual air temperature. Nonetheless, a fairly nice day for the end of December. For tonight, skies remain mostly clear early, then clouds begin to stream in late at night. Lows will only fall back to around 30 degrees.

Sunday, skies cloud up early with the approaching coastal storm. The low is expected to be over South Carolina early Sunday morning then rapidly moves northeast to be just south of Long Island Sunday night. The track of the storm was originally forecast to be well southeast of Nantucket, however computer runs over the last two days have consistently moved the track closer to the coast and now it appears the center may cross over Cape Cod during Sunday night before racing off towards Nova Scotia by Monday morning. If anything, this is a fast moving system that will hit quick and end just as quickly from sometime Sunday afternoon to about midnight Sunday.

As for precipitation types and amounts. Again, with the original track thought to be well offshore we had a better shot of a colder system with some snow. Then as the track moved closer toward the coast rain to a wintry mix became the solution. Now, with milder air moving across the landscape, because of a track that brings the storm over Cape Cod, this will primarily be a rainstorm throughout the local area. There could be some pockets of freezing rain through the far interior but even that is suspect at this time. Upwards of 1 to 1.5 inches of rain could fall in a span of about 6 or 7 hours. This could very well cause some flooding of low lying areas and will cause ponding on the roads. Please keep in mind this storm is over 1000 miles away and things can change before it arrives tomorrow.

If you are heading to the Patriots game late Sunday afternoon expect a cold rain and windy conditions throughout the game.

Monday we will see a cold front move through, probably early in the day, and this will knock temperatures down through the day, meaning our highs will likely occur before noon.

Over the next several days we will plunge into the deep freeze as we welcome the New Year with a shiver or two.

72 Hour Outlook:

Saturday and Saturday night: Fair skies overall. Variable clouds today, with increasing clouds later tonight. Highs in the low 40s with the mercury falling to the upper 20s inland to low 30s along the coast overnight. Brisk west to southwest winds today that may gust to 25 mph or so, diminishing tonight.

Sunday: Becoming cloudy early, chance of a few showers late morning and midday, followed by rain developing in the afternoon. Cooler, highs in the upper 30s to 40 degrees. Winds turn south to southeast 5 to 10 mph.

Sunday night: Rain, possibly heavy at times and becoming breezy. Possibility of freezing rain for a time well inland, west of Route 495. Precipitation winds down and should end around midnight. Temperatures falling into the low 30s by morning. Northeast winds gusting to 25 or 30 mph, especially along the coastal plain, backing to west and northwest after midnight.

Monday: Partly cloudy and turning colder. Highs in the mid to upper 30s, occurring by midday, then falling through the 30s in the afternoon. Gusty westerly winds.

Monday night: Partly cloudy and much colder. Lows in the teens.

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