First Flakes…Then a Brief Warm Up! 11/13/23
Hello! I hope everyone enjoyed their weekend! After a fairly mild Friday, the weekend turned decidedly colder. Both days were dry, but featured daytime highs in the 40’s and overnight lows in the teens and 20’s. In fact, Boston’s Logan airport finally dropped below freezing Sunday morning, with a low temperature of 31 degrees, officially ending the growing season. Average date of first freeze at Logan airport is November 7th, so it was slightly behind schedule, but nothing out of the ordinary. This morning was even colder, with a low of 29 degrees. This was the coldest temperature observed at the airport since March 20th. Across the interior, it was even colder. Many locations set back from the coast had low temperatures between 18 and 25 degrees. Indeed, the warm days of October are a distant memory!
First frosts and freezes are a milestone as we progress to winter. For those who enjoy winter, having the temperature drop to 32 degrees before the first wintry precipitation event is critical! I can guarantee you, if it snows before you have the first freeze, a mild winter lies ahead. It’s almost the atmosphere is telling you something. There’s nothing scientific about this, just good old fashioned knowledge from a lifelong weather observer! You may ask, how can it snow if it isn’t 32 degrees out? Trust me, it can and does! If the upper levels of the atmosphere is below 32 degrees, the precipitation falls as snow. If the precipitation falls hard enough, it can reach the ground even if it’s 34 or 35 degrees or sometimes even warmer!
Back in 2011, there was a big storm before Halloween, where much of interior New England got socked with up to 24″ of wet snow. Along the coast, it snowed hard, but temperatures remained above freezing throughout the event. This meant only a few inches of slushy wet snow accumulated, much of which melted as quickly as it fell. The following winter was one of the warmest ever recorded in New England. People were going to the beach on Columbus Day weekend that year!
After a colder than average start to November, I have some good news! It looks like the pattern is going to relax somewhat later this week so we can enjoy a brief warm-up! In fact, with Boston officially recording temperatures below freezing, we can officially call this a brief taste of Indian Summer! What is Indian Summer? Many people have different interpretations of it, which is okay! Some people feel any warm stretch of weather after the autumnal equinox can be classified as Indian Summer. However, the official qualification for Indian Summer is a stretch of warm weather, preferably 3 straight days with clear skies and light winds…after the first frost. If you want to be technical, they say most of the trees should be bare. However, the main stipulation is to receive a first frost or freeze.
Some friends have asked me what the difference is between a frost and a freeze. A frost can occur even if the air temperature is above freezing. This is because if winds are calm, cold air is dense and settles to the ground. Temperatures can super cool to 32 degrees, while 6 to 10 feet above the ground it can still remain between 33 and 36 degrees. A freeze is when the layer of cold air is thicker and temperatures fall to 32 degrees or lower for three straight hours, essentially killing the growing season. A hard freeze occurs if temperatures fall further to 29 degrees or lower for three consecutive hours.
Over the past two November’s, Bostonian’s have enjoyed long stretches of Indian Summer weather. The last two November’s have featured well above average temperatures in the Boston area. So far, more than a third of the way into the month, this has not been the case this year. Temperatures have averaged close to 2 degrees below average so far this month in Boston, and for most of the northeastern part of the country for that matter. This has been a stark change to the relentless warm autumn weather we’ve been experiencing this year.
With colder temperatures, comes the threat for wintry precipitation. Right on cue, many communities are seeing their first snowflakes this evening! Some communities north and west of Boston may even see a small accumulation! This won’t turn into anything serious, it’s actually a small disturbance riding along the divider between the cold air over us, and warmer air trying to move in. This small disturbance will intensify once it moves into the open Atlantic Ocean. This will act to buckle the jet stream and send a reinforcing shot of cold air tomorrow night into Wednesday.
I have often mentioned the jet stream acts as a garden hose. Think of when you were a kid and you picked up the garden hose and began shaking it to make big loops with ridges and troughs. This is how the jet stream in simplest terms behaves in our atmosphere! We’re currently in the trough (cold & wet). However, beginning Wednesday afternoon, the ridge (dry and warmer) will begin building into New England. However, as has been this case so far this November, this too will not last long!
A hybrid like storm will be developing off the southeast coast this week. This storm will begin tracking up the coast on Friday and begin to interact with an approaching cold front. At this point, it appears the brunt of this storm is going to pass just east of New England on Saturday. Once it passes our latitude, the front and the storm are going to phase and rapidly intensify this storm as it tracks into the Canadian Maritimes. This will once again buckle the jet stream allowing cold air to plunge back into New England on the back side of this storm for the second half of the upcoming weekend. There’s even an outside shot some of the cold air catches up with the departing moisture for a brief flip to snow up in the mountains of northern New England.
Come next week, more important changes are on the way to New England! Recent computer models are showing a very volatile weather pattern heading into Thanksgiving Day. Computer models have been very erratic in handling the rapidly evolving pattern. Latest data is showing arctic air charging towards New England with moisture nearby. Should these two weather systems merge at the right time, and right location, we could have some travel problems on our hands. Right now it’s only speculation. If further data increases the potential, I will be sure to let everyone know! At the very least, a sharp cold front looks to send temperatures plummeting on Thanksgiving Day and beyond.
All these changes could have major implications to our upcoming winter. Right now, the weather community is split 50/50 on what type of winter we’re going to experience. Half say warm and rainy, while the other half believes cold & snowy. I’m still reviewing last minute data before I post my official winter outlook one week from today! Earlier in the fall I was leaning warm & rainy. However, recent changes in the Pacific Ocean, combined with other important factors have me leaning the other way. I take many factors into account when comprising my winter forecast, much of which is following my intuition, despite what computer models are saying.
For instance, last winter computer models insisted the cold and snow were coming to New England. We waited and waited and waited, and nothing ever arrived. It was showing it, but when push came to shove, winter unloaded its fury out west, leaving us with one of the warmest and least snowiest winters on record for us here in Boston, and up and down the I95 corridor for that matter. This year, computer models are insisting warm weather is heading to New England. However, when the warm is supposed to be here, it’s still cold! Now, the big warm up for Thanksgiving week that computer models were depicting, is being replaced with colder temperatures and perhaps storminess. Again, nothing scientific about it, just a careful observation.
Now for your weekly autumn outdoor activity forecast. I will rate this week a 6 out of 10.
If you are out and about tonight, don’t be surprised if you happen to see some snow flurries or even patchy light snow in some areas. Observations have been reporting most activity centered across the hilly terrain of central Massachusetts. However, weather guru himself Pete Lovasco reports flurries and light snow up in Gloucester! Over the next few hours, anyone could see their first flakes if you look out the window at the right time. Otherwise, expect mainly cloudy skies overnight, with lows mainly in the 30’s.
Tuesday should feature slightly milder temperatures, but with a brisk wind and mainly cloudy skies, it will feel colder than what it actually is. High temperatures should rebound into upper 40’s and low 50’s across the area.
Skies should clear tomorrow night and turn colder all over again. Lows will fall into the upper teens and 20’s across the region.
Wednesday will feature fairly tranquil weather conditions. As winds turn more southwesterly, expect slightly milder temperatures come afternoon. Pesky clouds may still blot out the sun at times.
Thursday and Friday should feature milder temperatures, with highs approaching 60 degrees both days. Everything is relative. Last year, we had a week with temperatures in the 70’s in November! Nevertheless, temperatures will be above average for the date, and a welcome change to the November chill we’ve been experiencing!
As mentioned above, a fast moving storm system will begin tracking up the coast later Friday and into Saturday. This storm may actually turn into somewhat of a nor’easter, especially if the center remains off the coast. Latest computer data has this storm now tracking slightly closer to the coast. Therefore, expect rain and winds to pick up especially along the coast along and inside of I95 corridor. The rain could fall heavily for a time the first half of Saturday then diminish during the afternoon. I don’t expect anything too severe, however an impactful storm may be heading our way for the first half of our weekend.
Expect windy and colder weather to arrive on Sunday, with a mixture of sun and fast moving stratocumulus clouds. Temperatures will be falling during the day from the 40’s dropping to the 30’s by sunset. Next week will start off cool & dry. I’m watching another storm for Thanksgiving Eve and into Thanksgiving day. Depending upon the exact track, this storm could bring either rain, snow or a mixture of both across the New England region.
Well, that’s about it for now! My next post is scheduled one week from today on November 20th! This post will feature my official 2023-24 winter forecast for Boston and New England region. I will also have your all important travel forecast for the upcoming Thanksgiving holiday! In the meantime, embrace the November chill…it may even feel like the holidays for once!
~Thanks for reading & be safe!~
Pete