DAYS 1-5 (SEPTEMBER 29 – OCTOBER 3)

Discussion…

Things are on track, forecast-wise, it seems. We’re in the middle of a 3-day unsettled and humid stretch, and while we did not see a whole lot of shower activity yesterday, and won’t again today, I cannot rule out passing showers at times in a few areas later today. But our main window of opportunities for the most widespread and significant showers will be from about midnight tonight to noon Wednesday, as a wave of low pressure pulls a cold front eastward trough the region. From tonight through Wednesday morning we’ll also have a period of moderate to strong wind gusts which could result in local tree damage with some isolated power outages. While we remain on the eastern side of an upper level trough through the end of this week we will remain vulnerable to additional unsettled weather, and my target date of October 2 for the next round of unsettled weather remains a go, with a chance of some rainfall on Friday, mainly during the afternoon based on current timing. This should be long gone so that the start of the weekend will feature dry weather. The first 3 days of October (Thursday-Saturday) will also feature a cooling trend as the mild and muggy air we have now will be replaced with a Canadian airmass arriving indirectly via the Great Lakes and Midwest.

Details…

TODAY: Low clouds break for sun into midday then more clouds at times during the afternoon with a risk of a passing shower, but mainly rain-free. Highs 73-80. Dew point above 60. Wind increasing to S 10-20 MPH.

TONIGHT: Mostly cloudy. Areas of fog evening. Isolated showers evening. Numerous showers overnight, including a slight risk of thunderstorms. Lows 61-68. Dew point 60+. Wind S 10-20 MPH, gusts 25-40 MPH.

WEDNESDAY: Cloudy with widespread showers and a slight chance of thunderstorms morning, maybe lingering to early afternoon eastern coastal areas. Clearing follows and the day ends sunny. Highs 70-77. Dew point starts above 60 but falls to the 50s by day’s end. Wind S 15-25 MPH with gusts 30-45 MPH morning. SW 10-20 MPH with a few higher gusts afternoon.

WEDNESDAY NIGHT: Clear. Lows 56-63. Wind SW to W 5-15 MPH.

THURSDAY: Partly sunny. Highs 67-74. Wind W 5-15 MPH.

THURSDAY NIGHT: Variably cloudy. Lows 50-57. Wind variable up to 10 MPH.

FRIDAY: Mostly cloudy. Chance of rain or showers, favoring the afternoon. Highs 62-69. Wind variable 5-15 MPH.

FRIDAY NIGHT: Mostly cloudy with a chance of rain evening. Clearing but patchy fog overnight. Lows 53-60. Wind variable up to 10 MPH.

SATURDAY: Sun and passing clouds. Highs 59-66. Wind NW 5-15 MPH.

DAYS 6-10 (OCTOBER 4-8)

A wave of low pressure may bring some additional unsettled weather with a rain or shower chance later October 4 to early October 5. A cold front from passing low pressure to the north brings a shower risk October 7. Temperatures variable, but a sharper cool shot is possible by October 8.

DAYS 11-15 (OCTOBER 9-13)

A shot of cooler air to start this period followed by a warming trend again. Generally dry weather with just minor shower risk around October 10-11.

C-19 Chat Post – September 29 2020

DAYS 1-5 (SEPTEMBER 28 – OCTOBER 2)

Discussion…

High humidity and above normal temperatures through Wednesday. However, the 2 days that feel most like late summer instead of early fall will be today and Tuesday, as there will be a threat of showers but much of the time will be rain free and there will also be intervals of sunshine with all the cloudiness we have. It’s Tuesday night into Wednesday when a more solid shower threat occurs with the approach and passage of a cold front. The clouds, showers, and frontal passage will keep temperatures down a little on Wednesday over what they will be during the next two days. Many model forecasts have been bringing an additional wave of low pressure with significant rain up through the region Wednesday night into early Thursday, but I am somewhat skeptical of this. I think a wave of low pressure will occur, but as we go along I’m thinking this may be less potent and further offshore, and the details forecast will reflect that. Models have a lot of trouble sorting out disturbances and timing during transitions, and I think we will see a disturbance move through the region Friday with a chance of additional showers, although with cooler air instead of the warm and muggy weather we have for the start of this week.

Details…

TODAY: Variably cloudy. Chance of a few passing showers. Highs 72-79. Dew point 60s. Wind S 10-20 MPH.

TONIGHT: Mostly cloudy. Areas of fog. Chance of showers. Lows 60-67. Dew point in 60s. Wind S 5-15 MPH.

TUESDAY: Variably cloudy. Chance of showers. Highs 73-80. Dew point 60s. Wind S 10-20 MPH.

TUESDAY NIGHT: Cloudy. Showers likely. Areas of fog. Lows 60-67. Dew point 60s. Wind S 5-15 MPH, higher gusts.

WEDNESDAY: Cloudy with showers likely and areas of fog. Highs 70-77. Dew point 60s. Wind SW 5-15 MPH becoming variable.

WEDNESDAY NIGHT: Mostly cloudy with a chance of showers. Areas of fog evening. Lows 60-67. Dew point 60s falling to 50s. Wind variable 5-15 MPH becoming W 10-20 MPH.

THURSDAY: Partly sunny. Highs 65-72. Wind W 10-20 MPH, higher gusts.

THURSDAY NIGHT: Variably cloudy. Lows 50-57. Wind variable 5-15 MPH.

FRIDAY: Mostly cloudy. Chance of rain or showers. Highs 60-67. Wind variable 5-15 MPH.

DAYS 6-10 (OCTOBER 3-7)

Watch for a wave of low pressure that may bring some wet weather to the region at some point October 4-5, otherwise mostly dry weather is expected until the end of the period when an approaching disturbance or front brings the next risk of showers. Temperatures variable, coolest early in the period then milder late period.

DAYS 11-15 (OCTOBER 8-12)

A shot of cooler air to start this period followed by a warming trend again. Generally dry weather with just minor shower risk around mid period.

C-19 Chat Post – September 28 2020

DAYS 1-5 (SEPTEMBER 27 – OCTOBER 1)

Discussion…

No big changes in this outlook, just a series of expected forecast tweaks. Cloudiness will be more dominant today as a humid southerly air flow becomes more established. This still occurs without any rainfall today, but that changes as we get into the first 3 days of the new week which are also the final 3 days of September, and the shower threat appears in the pre-dawn hours of Monday and continues off and on through Wednesday. Tuesday night through Wednesday still appears to be the most likely time period for the most widespread shower activity. Any rainfall we get will be helpful for our drought situation, which still won’t be breaking any time soon. Immediate help will come for quelling our currently high fire danger. A final wave of low pressure that moves through Wednesday evening, based on current timing, should pull a cold front through the region and open the door for a cooler air mass, indirectly from Canada, via the Great Lakes and Midwest, as October arrives on Thursday.

Details…

TODAY: Areas of fog early, otherwise mostly cloudy to partly sunny. Highs 72-79. Dew point 60s. Wind S 5-15 MPH.

TONIGHT: Mostly cloudy. Areas of fog. Chance of showers after midnight. Lows 62-69. Dew point 60s. Wind S 5-15 MPH.

MONDAY: Variably cloudy. Occasional showers. Highs 70-77. Dew point in 60s. Wind S 10-20 MPH.

MONDAY NIGHT: Mostly cloudy. Areas of fog. Chance of showers. Lows 60-67. Dew point in 60s. Wind S 5-15 MPH.

TUESDAY: Variably cloudy. Chance of showers. Highs 70-77. Dew point in 60s. Wind S 10-20 MPH.

TUESDAY NIGHT: Cloudy. Showers likely. Areas of fog. Lows 60-67. Dew point lower 60s. Wind S 5-15 MPH, higher gusts.

WEDNESDAY: Cloudy with showers likely and areas of fog. Highs 70-77. Dew point 60s. Wind SW 5-15 MPH becoming variable.

WEDNESDAY NIGHT: Mostly cloudy with showers likely. Chance of a thunderstorm. Areas of fog. Lows 60-67. Dew point 60s falling to 50s. Wind SW 5-15 MPH with higher gusts shifting to W.

THURSDAY: Partly sunny. Chance of a shower. Highs 65-72. Wind W 10-20 MPH, higher gusts.

DAYS 6-10 (OCTOBER 2-6)

With a trough axis still to the west of our region, we can expect a couple opportunities for unsettled weather. Continuing to lean toward October 2 & 4 as the most likely wetter days. Temperatures variable, trending cooler. For those unfamiliar, a trough of low pressure is basically a dip in the jet stream and where your unsettled weather usually occurs and the axis of it is basically its mid point. The unsettled weather will often be more likely to the east of the axis. So the set-up described above leaves us vulnerable to additional wet weather, which would be welcomed if it occurs.

DAYS 11-15 (OCTOBER 7-11)

Generally zonal (west to east) flow is expected with overall drier weather, but a couple minor unsettled weather threats. Cooler air probably dominates the first part of the period followed by a warming trend.

C-19 Chat Post – September 27 2020

DAYS 1-5 (SEPTEMBER 26-30)

Discussion…

We’ll have a warmer than normal but more humid weekend, however it will remain rain-free. It won’t, however, remain fog-free for a large portion of the region, especially this morning and again later tonight into Sunday morning. This is one of the results of an increase in humidity. With a mostly clear sky above, the warmth from the day radiates out to space and as the air temperature drops to match the dew point temperature, fog forms, and can be rather dense as it is in some places to start the day today. But the same clear sky that played a role in helping the fog form will also play a role in its dissipation, as the sun rises higher into the sky and shines into the foggy areas, warming the air up, and eventually evaporating the fog. A generally sunny midday and afternoon will be the result today over southern NH and a good portion of MA, but there are already some clouds moving into the South Coast region and those will limit sunshine there today. These clouds make some advance tonight and we also see more fog patches forming which will burn off to a partly sunny to mostly cloudy sky on Sunday. But even with that, still not really a bad weekend for this area. Things change as we start the new week and go through the last 3 days of September. As previously mentioned, high pressure will have shifted offshore and a larger scale upper level trough will be forming west to New England, gradually moving to the east. A slow-moving cold front will approach and eventually enter the region, finally pulling through during Wednesday. While at days 3, 4, and 5 I still can’t time showery periods and drier periods, I can say that the best highest risk for the most widespread shower activity, based on current timing, looks like Tuesday night to early Wednesday.

Details…

TODAY: Large areas of fog and low clouds to start, burning off by late morning to a mostly sunny sky except partly to mostly cloudy South Coast. Highs 74-81.Dew point rising to around 60. Wind S increasing to 5-15 MPH.

TONIGHT: Partly to mostly cloudy. Areas of fog. Lows 57-64. Dew point near 60. Wind S under 10 MPH.

SUNDAY: Areas of fog early. Mostly cloudy to partly sunny. Highs 75-82. Dew point above 60. Wind S 5-15 MPH.

SUNDAY NIGHT: Mostly cloudy. Areas of fog. Lows 58-65 Dew point upper 50s to lower 60s. Wind S 5-15 MPH.

MONDAY: Variably cloudy. Chance of showers. Highs 70-77. Dew point in 60s. Wind S 10-20 MPH.

MONDAY NIGHT: Mostly cloudy. Areas of fog. Chance of showers. Lows 60-67. Dew point in 60s. Wind S 5-15 MPH.

TUESDAY: Variably cloudy. Chance of showers. Highs 70-77. Dew point in 60s. Wind S 10-20 MPH.

TUESDAY NIGHT: Cloudy. Showers likely. Areas of fog. Lows 60-67. Dew point lower 60s. Wind S 5-15 MPH, higher gusts.

WEDNESDAY: Cloudy start with showers likely and areas of fog, then partly sunny with scattered showers. Highs 70-77. Dew point starting in 60s then falling to 50s. Wind SW 10-20 MPH shifting to W with higher gusts possible.

DAYS 6-10 (OCTOBER 1-5)

Model guidance will struggle with development of additional low pressure near the East Coast. While some guidance has additional rain October 1 other guidance is dry. Varying guidance has varying solutions for the first several days of October. With this in mind, the best bet is to leave this portion of the forecast very general in that we’ll turn somewhat cooler and there may be additional opportunities for unsettled weather, still leaning toward October 2 & 4.

DAYS 11-15 (OCTOBER 6-10)

Zonal flow expected but mean trough may hang in the Great Lakes region. This would be a drier trend but not absent of at least brief rainfall threats. Temperatures would be variable but average fairly close to normal.

C-19 Chat Post – September 26 2020

DAYS 1-5 (SEPTEMBER 25-29)

Discussion…

Warm weather will be the rule through the weekend. You’ll notice an increase in humidity during these days as well, though not to oppressive levels, as the wind flow becomes southerly during the weekend. Continuing to keep rain, which we badly need, out of the forecast through the weekend. That will change as we get to the start of next week. As has been previously mentioned, an upper level pattern change will dig a trough into the Midwest and Great Lakes starting at the beginning of next week. This is likely to be a slow process. Initially as this occurs we will remain on the warmer side but there will be higher humidity and a risk of showers as a frontal boundary approaches from the west. Timing the greatest chance for showers for Monday and Tuesday is not really anything that can be done yet, so this part will be tweaked as we get closer to it.

Details…

TODAY: Hazy sunshine. Highs 75-82. Wind W up to 10 MPH becoming variable.

TONIGHT: Mostly clear but patchy ground fog. Lows 55-62. Wind variable up to 10 MPH.

SATURDAY: Mostly sunny. Highs 74-81. Dew point rising toward 60. Wind S 5-15 MPH.

SATURDAY NIGHT: Partly cloudy. Patchy fog. Lows 57-64. Wind S up to 10 MPH.

SUNDAY: Partly cloudy. Highs 75-82. Dew point above 60. Wind S 5-15 MPH.

SUNDAY NIGHT: Variably cloudy. Lows 58-65. Dew point near 60. Wind S 5-15 MPH, higher gusts.

MONDAY: Variably cloudy. Chance of showers. Highs 70-77. Dew point in 60s. Wind S 10-20 MPH.

MONDAY NIGHT: Mostly cloudy. Areas of fog. Chance of showers. Lows 60-67. Dew point in 60s. Wind S 5-15 MPH.

TUESDAY: Variably cloudy. Chance of showers. Highs 70-77. Dew point in 60s. Wind S 10-20 MPH.

DAYS 6-10 (SEPTEMBER 30 – OCTOBER 4)

Slow passage of upper level trough with the trough axis likely staying west of the region. This will allow for additional wet weather episodes but also with drier interludes. Timing the individual rain threats is difficult this far in advance but September 30, October 2, and October 4 would be my educated guesses at this point. While I highly doubt this shift in the pattern leads to an ending of the drought, as that will take quite some time, any rainfall we do get will help, and will be a more immediate help in alleviating our high fire danger.

DAYS 11-15 (OCTOBER 5-9)

Zonal flow expected but mean trough may hang in the Great Lakes region. This would be a drier trend but not absent of at least brief rainfall threats. Temperatures would be variable but average fairly close to normal.

C-19 Chat Post – September 25 2020

DAYS 1-5 (SEPTEMBER 24-28)

Discussion…

The seas have calmed down, the fire danger remains high, and this round of high altitude smoke has been sporadic and not nearly as thick as the previous one. The feel of summer is back and will continue through the weekend, but will there be any rain between now and then? No. We’ll see high clouds fanning across the sky today from the remains of Beta, the last active tropical system from the Atlantic Basin before the current quieter period. A cold front will arrive Friday, pretty much unnoticed, as it will be falling apart upon arrival. It may result in a few cumulus clouds – that’s about it. The weekend will see a gradual increase in humidity with the source region of our air basically a modified version of the tropical air mass that Beta was born in over the Gulf of Mexico several days ago. By Monday, we finally can talk about a chance of showers as the first of a series of fronts approaches in response to a larger scale trough developing and moving through the Midwest and Great Lakes. It’s too early to know the intensity and coverage of shower activity, and we can fine-tune that outlook as it gets closer.

Details…

TODAY: Sun, high clouds, and high altitude smoke. Highs 73-80. Wind W 5-15 MPH.

TONIGHT: Partly cloudy. Lows 55-62. Wind SW up to 10 MPH.

FRIDAY: Partly cloudy. Highs 75-82. Wind SW 5-15 MPH.

FRIDAY NIGHT: Partly cloudy. Patchy fog. Lows 55-62. Wind variable up to 10 MPH.

SATURDAY: Mostly sunny. Highs 74-81. Dew point rising toward 60. Wind W up to 10 MPH.

SATURDAY NIGHT: Partly cloudy. Patchy fog. Lows 57-64. Wind SW under 10 MPH.

SUNDAY: Partly cloudy. Highs 75-82. Dew point above 60. Wind SW 5-15 MPH.

SUNDAY NIGHT: Mostly cloudy. Lows 58-65. Dew point near 60. Wind SW 5-15 MPH.

MONDAY: Variably cloudy. Chance of showers. Highs 70-77. Dew point in 60s. Wind SW 10-20 MPH.

DAYS 6-10 (SEPTEMBER 29- OCTOBER 3)

The passage of an upper trough of low pressure will take place during the last couple days of September to the first couple days of October, with our area on the warmer and more humid side to start with, ending up on the cooler and drier side eventually. A few episodes of showery weather are likely during the transition.

DAYS 11-15 (OCTOBER 4-8)

Watch for a quick wet weather event to start the period if energy from the west interacts with moisture near the East Coast, otherwise high pressure takes back over with mainly dry and mild weather for the balance of the period.

C-19 Chat Post – September 24 2020

DAYS 1-5 (SEPTEMBER 23-27)

Discussion…

Today is a transition day out of the cool interlude we’ve had for several days, although we’ll still have a gusty northwesterly breeze in the wake of the extratropical storm that was once Hurricane Teddy. The circulation around that large storm has pulled some of the smoke plume from the western US wildfires, which had drifted into Canada, down across the Northeast, and we’ll see that in the sky in the form of a haze today. What you’ll also notice today is a warmer feel to the air, despite the northwesterly wind, as the source region for this air is warmer than what we had previously. This warming trend will continue through Friday, even when a weakening cold front arrives, so weak in fact that the weekend now looks pretty warm as well. Some models and some media forecasts have indicated a shower threat for the weekend, but I am leaving this out of the forecast at this time as I do not think there will be enough moisture and instability to result in them. Two additional things: 1) The rough surf along the coast will gradually settle down today. 2) The fire danger will continue to run very high today with a combination of very dry ground and a gusty breeze.

Details…

TODAY: Sun and high altitude smoke. Highs 72-79. Wind NW 10-20 MPH, higher gusts.

TONIGHT: Mostly clear. Some aloft decreases. Lows 51-58. Wind W up to 10 MPH.

THURSDAY: Sunshine. Occasional smoke aloft. Highs 73-80. Wind W 5-15 MPH.

THURSDAY NIGHT: Partly cloudy. Lows 53-60. Wind W up to 10 MPH.

FRIDAY: Partly cloudy. Highs 74-81. Wind SW 5-15 MPH.

FRIDAY NIGHT: Partly cloudy. Patchy fog. Lows 55-62. Wind variable up to 10 MPH.

SATURDAY: Mostly sunny. Highs 74-81. Wind W up to 10 MPH.

SATURDAY NIGHT: Partly cloudy. Patchy fog. Lows 56-63. Wind SW under 10 MPH.

SUNDAY: Partly cloudy. Highs 75-82. Wind SW 5-15 MPH.

DAYS 6-10 (SEPTEMBER 28- OCTOBER 2)

An eastward shift in large scale features will bring a broad trough of low pressure eastward into the Northeast and New England during this period. Showers are most likely September 28 and September 30 with the passage of two frontal systems as temperatures that start the period above normal start to cool down in stages. By the first couple days of October, it is expected be much cooler with just a risk of a few instability showers otherwise dry.

DAYS 11-15 (OCTOBER 3-7)

Expecting high pressure to be in general control with mainly dry weather. Temperatures near to above normal.

C-19 Chat Post – September 23 2020

DAYS 1-5 (SEPTEMBER 22-26)

Discussion…

In the shadow of a hurricane. That’s exactly where we find our eastern locations this early morning as the sunrise was hidden by the cloud deck on the western edge of Hurricane Teddy, passing by us far to the east today on its journey northward toward the Maritime Provinces of Canada. Teddy is starting its transition to a cold core storm, and is already a large storm in size so it will serve to keep a gusty northerly breeze going over us today. Despite the shield of cloudiness, which will start to move out later today, rainfall associated with the storm will be missing us very far to the east… Say goodbye to summer today as the autumnal equinox occurs at 9:30AM. However, the first few full days of fall will have more of a summer feel again, as we get back into a warmer westerly air flow by midweek, and a cold front making a run at the region Friday runs out of gas while ambling its way across the region late Friday, never quite bringing a push of cooler air fully in from the north as I thought may happen previously, so even Saturday looks like a mild day.

Details…

TODAY: High cloudiness will blot out the sun to start the day then eventually give way to more sun later. Highs 61-68. Wind N 10-20 MPH, a few higher gusts.

TONIGHT: Mostly clear. Lows 43-50. Wind NW 5-15 MPH, higher gusts.

WEDNESDAY: Sun and high altitude smoke. Highs 70-77. Wind NW 10-20 MPH, higher gusts.

WEDNESDAY NIGHT: Mostly clear. Lows 51-58. Wind W up to 10 MPH.

THURSDAY: Sun and high altitude smoke. Highs 73-80. Wind W 5-15 MPH.

THURSDAY NIGHT: Partly cloudy. Lows 53-60. Wind W up to 10 MPH.

FRIDAY: Partly sunny. Remote chance of a passing shower. Highs 72-79. Wind SW 5-15 MPH.

FRIDAY NIGHT: Variably cloudy. Patchy fog. Lows 55-62. Wind variable up to 10 MPH.

SATURDAY: Partly cloudy. Highs 70-77. Wind SW 5-15 MPH.

DAYS 6-10 (SEPTEMBER 27- OCTOBER 1)

Fair, warmer than average weather expected with high pressure to south September 27. A 3-day transition to end September with a few rounds of showers and even a few thunderstorms possible as a trough moves eastward across the region. A drier but cooler than average start to October based on current timing as a cool air mass arrives from Canada with the trough’s passage.

DAYS 11-15 (OCTOBER 2-6)

Expecting high pressure to be in general control with mainly dry weather. Temperatures near to above normal.