Early Fall? 9/23/24
Hello! Happy fall! I hope everyone enjoyed their weekend! It’s been a while since my last post, so there’s a lot to discuss! Unfortunately, my time prohibits a lengthy discussion. Growing work commitments and general lack of eventful weather has taken the steam out of my consistent posts. Nonetheless, I continue to closely follow global weather patterns and their impacts. Twenty-nine straight sunny & dry days beginning in mid-August did not inspire any late breaking weather posts!
My last post was a few days before the Fourth of July! Yes, we have crossed into a brand-new season since then. As mentioned above, most if not all of this period featured very few if any weather events. If you enjoy active weather with frequent changes, this has not been the pattern for you. In fact, this benign weather can be traced back nearly two years now. We now have observed two straight non-winters, and quite possibly a third on its way! But I’m getting ahead of myself!
After nearly two years of lackluster weather patterns, there was finally something to talk about this past weekend. A slow-moving early season Nor’easter developed southeast of New England last week. At first, computer models were keeping the bulk of this storm out at sea. However, as the week progressed, it was becoming more and more apparent that this storm was going to retrograde back towards the coast, bringing with it wind & rain. What computer models were struggling with was just how much? Many models continued to keep the heaviest rainfall offshore.
After weeks of dry weather, Mother Nature began to take control of the situation. Northeast winds freshened along the coast, as bands of moisture began to pinwheel in off of the ocean. It was questionable whether Boston would be included in the heavy rain or not. I was watching the radar closely as the band began to encroach the coast late Friday night. By Saturday morning, soaking rains pushed back as far as I495 with gusty northeasterly winds. As miserable of a day as it was, we were long overdue for a good soaking.
Yet, Boston was far removed from the brunt of the storm. The bullseye for this particular Nor’easter was felt on Cape Cod, where between 5 and 8″ of rain fell. There were even isolated official reports of up to 11″ plus fell in the Chatham, Harwich region. In addition to the rain, northeast gales whipped up the ocean, resulting in moderate beach erosion and pockets of coastal flooding. I was in contact with my friend Laz in Chatham, and he confirmed the deluge as well as some structural damage and boats washing ashore. There were other reports and video of waves crashing over sea walls along the Massachusetts coast. I must say, for a non-tropical system here in September, it was quite impressive.
Before the storm, we enjoyed 29 straight days without any measurable precipitation here in Boston. What a stretch of weather! It just doesn’t get any better than that! After nearly 18 months of non-stop rains, the spigot was finally turned off! I have always said, New England experiences different climates at any given time from all across the country, if not the world! This time around I believe the climate was similar to San Diego, California! Who could argue? Day after day of sunny skies, low humidity, and temperatures in the low 80’s.
With an approaching La Nina, I believe drier weather patterns will be evolving heading into this winter. This doesn’t mean no rain for a month straight, just not the flooding rains we have been experiencing since last summer through this past winter. In fact, we have another rainy day coming up this Thursday.
With autumn beginning yesterday, many friends and family members have been commenting on the early splashes of fall foliage. Indeed, late August and early September offered perfect conditions for the leaves to start thinking fall! The Boston area has not seen a proper foliage season for several years now. Last summer and fall were exceptionally wet with very warm & humid temperatures. This allowed the trees to continue receiving plenty of nutrition deep into the fall. The warm & humid weather tricked the trees into thinking it was still summer. Therefore, the trees remained green all the way through October. A sudden freeze in November ended the party, but by then it was too late. The leaves froze, turned brown and fell off the trees. Awful!
Will this year be different? So far, so good, but I have my concerns. It started out perfect, with a sudden drop in temperatures in mid-August. This brought clear, cool nights with very low humidity. These conditions continued deep into September, with sunny, warm days and clear cool nights. Once again, low dew point temperatures allowed temperatures to drop into the 40’s and 50’s even in Boston. This, along with the exceptionally dry weather, had trees changing colors earlier than normal.
Folks, it’s all relative to be honest. What’s early this year, was actually normal 40 years ago. Back then, the first chill of autumn was felt nearly every year come September. Leaves would begin to change in September, with peak fall colors around Columbus Day weekend around the Boston area. With oceans warming and an overall warming climate, peak fall foliage is now a good two weeks later than what it used to be around here. In addition, colors have not been as bright. Black tar disease and warmer temperatures have left many trees with muted or non-existent colors.
What about this year? So far, colors are running ahead of schedule up north. This too could be as a result of the extremely dry conditions up in that region. While we had rain over the weekend, there was no precipitation up north. One thing that is lacking is some chilly temperatures. If we had just a few nights down into the 30’s it would set the leaves on fire! I do see some temperatures getting down into the 40’s this weekend. This may be just cool enough to active the tree to change colors. Right now, if you plan on heading for a fall foliage trip, you will need to head up to the White Mountains of New Hampshire, and the Green Mountains of Vermont. By this weekend, I’m expecting about 50% leaf change up there. It may be the following weekend when peak foliage arrives up there. With the dry conditions, leaves can change quickly without notice!
For us down here in southern New England, we still have a way to go. As encouraging as it was to see some early fall colors, I’m growing somewhat concerned heading into October. La Nina years can be extremely volatile. At this point, I’m optimistic for a brighter foliage season than past several years. If we continue to observe foliage changing earlier, we could end up with peak colors arriving in Boston the last week of October leading up to Halloween. As long as temperatures don’t warm up too much, and some chilly nights arrive in October. This would be a welcome change from mid-November the past couple of years!
Some La Nina’s bring late season summer temperatures well into November. Other La Nina’s bring an October chill, a severe windstorm or early snow! Does everyone remember October 2011? This was a La Nina year, which brought the historic Halloween Blizzard to interior New England. That winter turned out being one of the warmest and least snowy winters on record! I’m not saying this is going to happen, but I’m going to keep a close eye on October. We have had some strange weather in October in recent years. I could envision early season cold meeting up with a tropical system moving up the coast. This could result in a early season snowfall for interior New England. Computer models have been all over the place. For two months in a row NOAA monthly outlooks have been placing too much emphasis on warmer than normal temperatures in New England. August finished slightly below average, and September is set to finish neutral, or very close to seasonal average.
For what it’s worth, NOAA’s winter outlook is calling for well above average temperatures this winter for much of the eastern part of the United States. This includes us here in New England. Other reliable seasonal forecasts from such models as the ECMWF, known as the European is calling for a blow torch winter with hardly any snowfall for December, January and February. If taken verbatim, this would imply one of the warmest and least snowy winters on record for Boston this year. This is coming off two of the warmest and least snowy winters on record, winters 2022-23 and 2023-24 here in Boston. These were absolute duds!
The outlook for this winter remains uncertain to say the least! At first, I was in agreement with the non-winter outlook. But the more I continue to evaluate the big picture, the more skeptical I become. By non-winter I would be talking about snowfall accumulations of 10″ or less. This would be pitiful. Many would argue accumulations of 20″ or less would qualify as a non-winter. At this point, we would be in uncharted territory. We already broke a record last winter for having back-to-back winters in Boston with less than 20″ accumulations. That had never happened in recorded history. To have a third winter with less than 20″ of snowfall in Boston would be truly unprecedented. I suppose anything is possible these days. I will say this, recent computer models are showing global ocean temperatures beginning to cool. Could this have an impact on our climate this winter? It’s possible computer models are not factoring this latest trend. As we head deeper into autumn, I will update everyone on my latest thinking for our upcoming winter season. At the very least, my winter forecast will be posted on November 25th.
Before the weekly forecast, here’s a quick summer recap. I would give my forecast a B-. What started out so strong, ended up fizzling in the end! My initial forecast called for between 14 and 17 ninety-degree days. After new guidance and a torrid June heat wave, I increased that number to 17 to 20. Things looked promising after a hotter than normal June, followed by a much hotter than normal July. However, after a hot first week of August, hot temperatures abruptly ended. Overall, it was a much hotter than normal summer across much of New England. When we look back at the raw numbers to this summer in history, it will be very deceiving. Boston’s Logan Airport officially recorded only 12 ninety-degree days! This is actually two less than normal! However, when one looks at observations from other locations, even locations within the city neighborhoods, many places observed 20+ 90-degree days! This was due to a very light and feeble sea-breeze which occurred on nearly a daily basis at Logan Airport, holding temperature just below 90 there. I believe there were at least a half dozen days of high temperature at Logan of 89 degrees! Precipitation was on point! I called for a much better summer than last summer. Dryer, but still with episodes of rain to keep the lawns and gardens happy. I also called for a much drier second half of summer and which indeed happened.
Now for our weekly outdoor autumn activity forecast. I would give this week a 7 out of 10. Big improvements as we head into Friday and into the upcoming weekend.
After a mainly cloudy day, expect clouds to linger overnight, with low temperatures falling into the low to mid 50’s. Not much difference between urban and rural areas tonight due to the cloud cover.
With a persistent onshore flow, expect low clouds and patchy areas of fog for your Tuesday and Wednesday. This does not mean it will be cloudy all of the time. Expect the most clouds to be during the morning hours, with breaks of sunshine developing late morning and into the afternoon. With a northeast wind, temperatures should remain cool, with highs only in the mid 60’s across the region. This is about 5 degrees cooler than normal.
A warm front will be approaching the region later Wednesday. Expect clouds to increase after any early sun. There actually may be some renegade showers first thin in the morning, especially north and west of Boston. Some computer models are showing this. Overall, it should be a mainly dry day.
As the storm system and associated warm from approaches New England, expect rain to overspread the region later Wednesday evening. Normally, this type of system would bring just a few showers and move north of the region. However, there is a robust -NAO in place, aka the Greenland Block. This is going to slow down the system and allow more precipitation to develop than what normally would. Therefore, expect a rather wet day for your Thursday, with generally a half inch to one inch of rainfall.
High pressure should begin to build down from Canada on Friday and suppress this complex system off to our south. This should allow for some clearing skies building n for your Friday, with temperatures remaining in the 60’s.
Strong high pressure should continue to protect our region throughout the upcoming weekend. At this point, I’m optimistic that we should enjoy dry conditions, with temperatures starting off cool, but possibly eclipsing 70 degrees with sunshine on Sunday. I hope this all works out! Many folks are planning on enjoying outdoor fall activities including hiking, camping, apple picking and fall festivals!
Well, that’s about it for now my friends! Honestly, I do not know when my next post will be written. I made time today, but who knows in the coming weeks. I can promise you at least one post during October, then of course the winter forecast on November 25th. If time permits, I will write more. I appreciate your continued support and understanding! If a severe storm threatens, I will be sure to update everyone through social media. In the meantime, wherever your travels may bring you, take time to enjoy what many believe is our best season here in New England!
Be safe and thank you for reading!
Pete