Friday August 27 2021 Forecast (7:39AM)

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DAYS 1-5 (AUGUST 27-31)

Heat and humidity hang on especially for southern areas for one more day but a back-door cold front will cross the region during the day today into this evening putting an end to the hot spell. The front, besides a wind shift and temperature drop, won’t produce much more than an isolated shower or thunderstorm mainly south of I-90 sometime today, if anything at all. High pressure builds across eastern Canada supplying cooler maritime air for the weekend and the front will come to a stop just south of New England before starting to return as a warm front later Sunday. I’m optimistic that enough dry air will be supplied by the high pressure area to keep us mainly dry for the weekend, with even partial sunshine, but showers should become more possible especially in southern and western areas with the approach of the warm front later Sunday. The front pushes across the region Sunday night into early Monday delivering a warm to hot and humid air mass to us once again, but this time for a very brief visit as a well defined cold front then approaches later Monday from the northwest and passes through the region Monday night and early Tuesday, bringing a drier Canadian air mass in, this time a continental polar air mass from the northwest for a warm but drier end to the month of August.

TODAY: Mostly sunny to partly cloudy. Isolated showers or thunderstorms possible midday and afternoon mainly south of I-90. Highs 85-92. Dew point middle 60s to lower 70s north to south to start, then gradually decreasing north to south. Wind NW shifting to NE increasing to 5-15 MPH from north to south.

TONIGHT: Variably cloudy. Patchy ground fog. Lows 58-65. Dew point falling to upper 50s. Wind NE up to 10 MPH.

SATURDAY: Partly sunny. Highs 70-77, coolest eastern coastal areas. Dew point upper to middle 50s. Wind NE to E 5-15 MPH.

SATURDAY NIGHT: Variably cloudy. Patchy ground fog. Lows 58-65. Dew point middle to upper 50s. Wind E up to 10 MPH.

SUNDAY: Mostly cloudy. Scattered showers mainly south and west of Boston by later in the day. Highs 68-75, coolest eastern coastal areas. Dew point upper 60s to lower 60s. Wind E to SE up to 10 MPH.

SUNDAY NIGHT: Mostly cloudy. Scattered showers. Areas of fog. Lows 62-69. Dew point lower to middle 60s. Wind SE up to 10 MPH shifting to SW.

MONDAY: Partly sunny. Chance of showers and thunderstorms. Highs 85-92. Dew point upper 60s to lower 70s. Wind SW 5-15 MPH.

MONDAY NIGHT: Variably cloudy. Chance of showers and thunderstorms. Areas of fog. Lows 65-72. Dew point middle to lower 60s. Wind variable 5-15 MPH.

TUESDAY: Sun and passing clouds. Highs 80-87. Dew point falling to upper 50s. Wind NW 5-15 MPH.

DAYS 6-10 (SEPTEMBER 1-5)

The moisture from the remains of a Gulf of Mexico tropical system (Ida) may impact our area with a chance of rain sometime September 1 into September 2, depending on how they move into and through the eastern US. Behind that should be a period of warm and humid weather for a day or two before a Canadian cold front brings a shower/thunderstorm threat by the end of the period.

DAYS 11-15 (SEPTEMBER 6-10)

One or two shots of cooler/dry air are possible during this period, but the details cannot be determined just yet. This should be a drier period of weather overall, but at least one shower threat should take place with an air mass change.

51 thoughts on “Friday August 27 2021 Forecast (7:39AM)”

    1. Such a long stretch of oppressively humid or hot & humid.

      There’s hope long term. I think the 00z GFS projects the day after Labor Day to be in the 60s with sunshine.

      Seeing some projections for 1030 mb + highs coming southeast off of Hudson Bay in the long range.

      1. Has to happen at some point. The days are definitely getting shorter.Of all months, I find the loss in daylight in August the most noticeable; both ends of the day.

    2. I’m seeing a possible cooler early September mentioned by several on Twitter. I sure am ready to open windows and sit outside. How is Mrs OS?

  6. Looks like the system that moves through the Northeast helps steer the strong system that comes off of Afrika early next week. Liking the current steering patterns over the MDR. The Mid-latitude high is rather weak which helps with decreasing the hurricane threat in the eastern Caribbean.

  8. Logan is at it again,

    Logan dp = 66

    Beverly 72
    Bedford 73
    Norwood 72
    JP 72

    !@_(#)(!@&*#(&!*(&$*!&@$_&!@)$&()!&@$(&!@$(&!)(@$&()!&@$&!$(&!(@$&(!&@$(!&@$_&!_(@$&()!&@$)($&)!(&@$_!

  9. BTW, Logan is already up to 88 and it looks like they had a low of 81. I wonder if that is a record for the date? Or even the month?

    Barely 9AM and already 88. Destined for yet another 90 degree day which I believe will make 24 on the season.

  12. If I recall Gloria came our way after a huge hi pressure came down from Canada moved to south and steered Gloria up our way. Could this senerio happen again?

  13. Logan dp = 66
    Worcester dp = 67

    Both have wind N at 7, could that have something to do with it JPD?

    All other locations have calm winds and 70+ dp’s.

  15. Thanks TK
    I don’t trust long range projections by models but according to the 0z GFS after today I am seeing the majority of the days with dew points which will be quite comfortable. I know there will be another blast of heat and humidity before the summer is over as summer never goes quietly but hoping this year that this will be the last stretch of heat and humidity until next summer.

  16. I always feel once we get past September 10th the heat and humidity does not have the staying power just like when we get to March 1st when the cold doesn’t have the staying power.

  17. 11 AM Update on IDA

    NHC now predicts a strength of 120 mph

    FORECAST POSITIONS AND MAX WINDS

    INIT 27/1500Z 20.7N 82.1W 55 KT 65 MPH
    12H 28/0000Z 22.2N 83.7W 65 KT 75 MPH…OVER WESTERN CUBA
    24H 28/1200Z 24.0N 85.8W 75 KT 85 MPH…OVER WATER
    36H 29/0000Z 25.9N 87.8W 90 KT 105 MPH
    48H 29/1200Z 27.6N 89.7W 105 KT 120 MPH
    60H 30/0000Z 29.0N 90.8W 105 KT 120 MPH
    72H 30/1200Z 30.3N 91.3W 60 KT 70 MPH…INLAND
    96H 31/1200Z 33.3N 90.2W 30 KT 35 MPH…INLAND
    120H 01/1200Z 35.2N 87.1W 20 KT 25 MPH…POST-TROP/REMNT LOW

  19. 12z GFS showing 2-3 inches of rain in our region from some kind of leftover setup from Ida.

    Behind that, it projects the first of what may be a few refreshing air masses.

    Back up in Maine to quickly finish this camping trip.

    I’d like to tell you it’s now refreshing up here and relief is a few hours away, however, it’s still pretty hot and humid here, to this point in the day.

  20. When you get into September you could start getting stronger cold fronts where there is a noticeable drop in temperatures after the frontal passage.

  22. I wonder if the most recent passage through the northeast quadrant of Ida will have the NHC upgrading to a hurricane at 2pm ?????

      1. Ida whose name is already assured of being “retired” as it’s expected to become a major hurricane by the time she approaches the LA coast.

    1. Oh noooo. My heart aches for these folks. I’ve been thinking about toms comment re shelters and covid in addition to thr even itself.

  25. The convection was mostly about as expected today. If there was one surprise maybe for me, it was the cells that popped along the Route 2 Corridor, otherwise most of the stuff was to the south as expected.

    Radar was fascinating to look at over the last few hours – so many boundaries!!

    I know at one point I termed the front coming down as a back-door cold front, as did NWS, but that’s really not the case. The frontal boundary orientation is NOT one that fits the BD front definition, so I and they are in error using that term. It’s just a cold front (maybe side door hahaha). The orientation of the wind around high pressure to the north eventually brings it in from the ocean, but that doesn’t make what we had a BD front. Bottom line though: It’s an air mass change, and it will be cooler and not as humid soon.

    Glimmer of hope in a dire situation for the Gulf Coast. Ida’s rapid intensification may turn it left a little bit into an orientation that takes it a little more parallel to the coast rather than perpendicular. That could slightly lessen the impact. Also a further westward jog before landfall would reduce the impact on New Orleans at least somewhat. It’s not a bright hopeful glimmer, but it’s something.

    Can’t really speculate on the medium range impact (if any) of the remnants of Ida up this way. There is a range of timing and potential with that, so I’ll just leave things the way they are for now and re-evaluate that for the morning update.

  27. Logan now has (24) 90 degree days and closing in on the record of 30 in 1983. Still plenty of time, unfortunately.

    1. It would be more impressive if about 5 of those were actually 90 degree days.

      This summer is not even close to as hot as 1983.

  28. Louisiana officials saying they “don’t have time” to reverse inbound lanes to evacuate. That’s inexcusable. This plan should have been in place “on paper” long in advance, only to be implemented when needed.

    People will die unfortunately because of that incompetence.

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