Friday September 10 2021 Forecast (7:26AM)

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DAYS 1-5 (SEPTEMBER 10-14)

The slow-moving front that brought us our muggy and showery weather yesterday is offshore, and drier air will move in today, but an upper level disturbance combined with the sun’s heating of the ground and lower atmosphere, and leftover moisture there, will cause clouds to pop up, a few of which may build enough to release isolated showers this afternoon. Other than that, it will be a nice day today. However I do need to remind anybody with plans that include being near the coast or in the coastal waters that large ocean swells, rough surf, and rip currents will be an issue today into the start of the weekend as a result of offshore Hurricane Larry. These conditions will improve later in the weekend. The weekend itself will feature great weather as high pressure is in control. After a night of calm wind tonight, Saturday starts off rather cool, but warms nicely during the day, and Sunday ends up the warmer of the 2 days as the high pressure area slides to the south and a west to southwest wind strengthens, transporting warmer air from the Ohio Valley our way. However a cold front will drop out of Canada and cross the region during the early hours of Monday, perhaps with a few showers. There has been some waffling of guidance as to whether or not Monday would clear out or end up unsettled. For now I continue to lean toward the drier more optimistic side with perhaps a morning shower then fair weather returning. An area of high pressure from Canada will not really make a dive into the Northeast, but rather nose its way in but stay mostly to the north. This will allow the front that went by to re-approach as a warm front later Tuesday with an increase in clouds, but the early idea is that any shower threat with this would hold off that day.

TODAY: Sunny start then a sun/cloud mix. Isolated afternoon showers. Highs 70-77. Wind NW 5-15 MPH.

TONIGHT: Clearing. Lows 49-56. Wind NW under 10 MPH then calm.

SATURDAY: Sunny. Highs 72-79. Wind calm then W to SW up to 10 MPH.

SATURDAY NIGHT: Clear. Lows 53-60. Wind SW up to 10 MPH.

SUNDAY: Sunny. Highs 76-83. Wind S 5-15 MPH.

SUNDAY NIGHT: Partly cloudy. Chance of a shower overnight. Humid. Lows 60-67. Wind SW 5-15 MPH.

MONDAY: Partly sunny. Chance of a shower in the morning. Highs 70-77. Wind N 5-15 MPH.

MONDAY NIGHT: Mostly clear. Lows 50-57. Wind NE up to 10 MPH.

TUESDAY: Partly sunny. Highs 70-77. Wind E up to 10 MPH.

DAYS 6-10 (SEPTEMBER 15-19)

Low pressure passing north of the region drags a warm front through early on September 15 with a warm and more humid day being the result. Its cold front should move in at night or on September 16 with potential showers and a few thunderstorms followed by drier and cooler air later September 16 into September 17. High pressure that moves in briefly at that time will then slide offshore later in the period and a southerly wind will develop, at which time we may need to be keeping an eye on tropical moisture to the south of New England for a potential run at the region. Low confidence on this part of the forecast but definitely some hints that it can occur on our medium range guidance and from the overall weather pattern expected.

DAYS 11-15 (SEPTEMBER 20-24)

The weather pattern still should feature a mostly west-to-east movement of systems pending on what happens with the moisture to the south to start the period, but eventually a cold front should sweep through with a drier air mass arriving by mid period. A lot of tweaking to come on future updates.

42 thoughts on “Friday September 10 2021 Forecast (7:26AM)”

  7. Thank you, sir.

    Thanks for the explanation re Harvey’s FB posts. Odd that I have only seen that with him and both times it was for a warned tornado.

  8. Surprisingly Boston was “dry” much of the time during the day with very intermittent light showers. Rain didn’t really get going until dinner time and beyond. Logan received 0.96 inch.

      1. I guess I rely on those “futurecast” radars from the tv mets too much. They showed steady rain filling in consistently all day long.

        1. Thanks JPD. It will be interesting if Logan’s “thermometer” will be mentioned. I highly doubt it though. 😉

    1. If they are sure this will happen, they should switch names of tropical systems.

      The storm near the Baja of California is Olaf.

  14. Hurricane Larry to turn into a Greenlandic blizzard on the eastern side of the island. By the way, there aren’t many towns or villages in this part of Greenland.

    As it positions spins off the east coast of Greenland it will briefly have sustained winds around 60 to 70 mph, with gusts as high as 85 mph.

    As Larry interacts with an upper level low near the east coast of Greenland it will be able to pull in a lot of moisture leading to significant snowfall in Greenland. Widespread totals of 12 to 18 inches are expected, with higher elevations getting 2 to 4 feet or more.

        1. I remember you saying that. Beautiful city, apparently. My brother visited and told me all about it. I’d like to go at some point.

          1. I would also. We went through Nova Scotia about 15 years ago. Much of Macs family moved there from Scotland. The area is just beautiful

  16. The center of Henry went very near buoy 44139 recently.

    Its pressure was 28.41 inches or 962 mb.

    They are in for a brief, but big hit.

    That pressure is very, very low for the given ¨sustained winds¨

      1. With so many, that is easy. But do you know how happy it makes an old(er) person when a youngun does that. Thanks 😉

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