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Coolest November since 2018 & 2019 continues into an unsettled Thanksgiving week...and beyond...

11/19/2023

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Good evening from Southern Connecticut Weather! 

The quiet season is over, and now it's time to write more frequently and formally. A warm and wet October turned into a colder and drier than normal November, our first real colder than normal November in a few years. 

Thanksgiving is right around the corner! In addition, we're a little over a week away from the start of meteorological winter on December 1st. Let's take a look at the week ahead, which does look unsettled before and after the holiday, and a quick look at the overall medium range pattern. 
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Above: A look at temperature departures through the month of November, not including today. Despite the recent three day warm stretch, the region is generally running 1-3 degrees below normal, a departure from recent Novembers. In fact, the previous three days represent half of the total above normal temperature days we've seen this month at BDL. 12 of 18 days have been below normal! 
Monday-Tuesday
The start of the holiday week will return us to below normal temperatures, in the wake of our weekend front. Tomorrow looks fine but seasonably cold with sunny conditions and highs returning to the upper 30s to low 40s. 

Tuesday also looks fine and seasonably cold but our pre-Thanksgiving storm will be approaching, meaning that we will see increasing clouds over the course of the day. It looks like any precipitation will hold off until after 5pm. There is the chance of some brief rain/snow mix in the highest elevations in northern CT, but no accumulation is expected. 
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Above: A 12z Euro depiction of the storm system late Tuesday into Wednesday. Although you're seeing some mixing verbatim on this model for high northern CT elevations briefly, it's not anticipated to be major. Wintry precipitation looks to be more significant in interior New England. Rain here. Image courtesy of Pivotal Weather.
Wednesday
The travel day before Thanksgiving does not look great. If you are traveling north into places like New Hampshire and Vermont, you may want to leave for those locations earlier to avoid possible wintry precipitation. For Connecticut, however, Wednesday looks wet and breezy, particularly in the first half of the day. 

I don't anticipate major issues with wind. Rain may be moderate to heavy at times, particularly in the morning hours. By mid-afternoon however, I expect that we will have cleared out, allowing for better travel. This will probably be the warmest day of the week, with southerly flow putting highs in the upper 40s to low 50s. 

Thanksgiving Day & Friday
Thanksgiving itself looks like a quiet day, with cooler and breezy conditions. Once again, I do not expect any significant issues with wind. It should be sunny with highs in the 40s. Region wide, the day looks fine. The day after Thanksgiving looks quiet as well, with continued colder than normal temperatures in the 40s and sunny conditions, with increasing clouds late in advance of our next storm system. 

Saturday-Sunday
The end of the forecast period looks unsettled as well. The guidance has coalesced around another system, potentially a coastal storm, moving into the region Saturday. There is still a bit of a split, which is normal at this range, on the strength and timing of this system, but it looks like Saturday at least is wet, and Sunday could be in jeopardy as well if this is a slower moving coastal. 

The 18z GFS below, which again is just one solution of one model run, has a bona fide coastal complete with colder air wrapping in to our north. Despite it being a colder than normal November, having the necessary cold for a snow event across Connecticut is still very hard, meaning a cold rain is most likely. It's something to watch regardless of the precipitation type, as this system will likely impact travel. 

Overall, expect a rain event late Tuesday into the first half of Wednesday, and again on Saturday possibly into early Sunday. Image courtesy of TropicalTidbits.
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The Dailies
Monday: Mostly sunny and seasonably cold. Highs in the upper 30s to low 40s. 

Tuesday: Mostly sunny early with increasing clouds and rain late. Chance of brief mixed precipitation in higher elevations. Highs in the low to mid 40s. Chance of rain 90%. Chance of (elevated) mixed precipitation 30%. 

Wednesday: Mostly cloudy and breezy with rain through early afternoon, followed by gradual clearing. Highs in the upper 40s to mid 50s. Chance of rain 100%. 

Thanksgiving Day: Mostly sunny and breezy, with cooler conditions. Highs in the low to mid 40s. 

Friday: Mostly sunny with increasing clouds late. Highs in the mid to upper 40s. 

Saturday: Mostly cloudy with rain. Highs in the low to mid 40s. Chance of rain 60%.  

Sunday: Mostly cloudy with rain showers possible early. Highs in the low to mid 40s. Chance of rain 30%.

Looking Ahead
Now let's turn to the medium range pattern.  
Picture
Above: the latest medium range Climate Prediction Center (CPC) outlook for temperature closing out November and entering December. The CPC shows most of the nation having a good shot of being below normal overall during this period. 

How much does a colder than normal November matter for December? I think it matters some as we look to have turned the corner from a warm October to colder than normal November and early December. For those of you following the last few years, that hasn't been the case. A warm November 2022 led into a historically bad winter across Connecticut. 

The look is different so far this season, albeit fragile, as we go from late November into early December. Our overall cold source regions to our north and west have actually been cold, and the broader pattern over the Pacific and North America has allowed for consistent cold loading into the region. 
Picture
Above: a 500mb look at 5 day averaged heights over North America around December 1. This is a solid look for colder than normal and potentially stormy conditions. 

As we turn the page into December, it becomes a little easier for wintry precip events to pop up if timed right, particularly in interior CT. For now, it looks like the moderate to strong El Nino is still feeling the effects of our past Nina. In a Nino year, we can usually expect a warmer than normal and less snowy December. We will see if that asserts itself by mid-December, but for now, early December may feel festive for once. 

Stay tuned to our winter forecast, to be released by the start of meteorological winter on December 1.

A​s always, please like, share, and interact with us on our social media--on Facebook to share our discussions, and follow us on Twitter @southernctwx to retweet our posts. Hit the buttons below to join.
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Thank you for reading SCW.
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-DB​ ​
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