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For Tonight & Thursday: An area of high pressure will push to the east tonight while a strong low pressure system pushes into the central Great Lakes region by Thursday evening. Partly cloudy skies are expected this evening with skies becoming cloudy after midnight tonight. Low temperatures will be between 20 and 25 Degrees. Winds will be Southwest at 5 to 10 mph. Thursday is expected to be cloudy and I do still think that rain with that storm system will hold off until evening. This means that dry conditions still looks likely all day on Thursday. High temperatures will be between 40 and 45 Degrees. Winds will be East at 5 to 10 mph in the morning and East at 10 to 20 mph in the afternoon. A Strong Storm System Will Bring Heavy Rain, Strong Winds On Thursday Night & Friday & Then A “Flash Freeze” Occurring Friday Evening: A strong storm system is expected to track from the eastern Ohio Valley on Thursday evening to western New York State by Friday morning. This storm system is then anticipated to move into Quebec province during Friday afternoon and Friday night. Because this storm system will be tracking to the west of our area, this is going to be a nearly all rain event. The exception may be at the very start of the storm Thursday evening when precipitation may start as a very brief period of snow and sleet, especially across areas north of the Mass Pike and in the Berkshires. The other exception looks to be at the very end of the storm when Arctic air rushes into the region causing the rain to change to a period of snow everywhere late Friday afternoon and Friday evening before it ends. There are three threats with this storm system and they are strong winds, heavy rainfall with street, highway and poor drainage flooding and the possibility of river and stream flooding and a flash freeze at the very end of the storm. Strong Winds: The pressure gradient between the strong low pressure system moving into Quebec province and a strong high pressure system over Newfoundland and Labrador will lead to strong winds to be a real concern with this storm system. It appears that there may be two periods where there’s going to be potentially really strong winds, along with an enhanced threat for downed trees, downed power lines and power outages. The first looks to be from mid to late morning Friday through the early afternoon hours on Friday when south to southeast winds may gust up to 50 mph thanks to a low-level jet moving through the region. The second period of potentially very strong winds looks to be between about mid to late afternoon Friday through Friday evening when the Arctic air rushes into the region. During this time, southwest winds may gust up to 50-60 mph at times, especially when the Arctic air initially moves in late Friday afternoon. Heavy Rainfall With Street, Highway & Poor Drainage Flooding & The Threat For River & Stream Flooding (Especially Along The Connecticut River): Heavy rain is expected to occur throughout Thursday night and Friday with total rainfall amounts of around 2 inches expected with local amounts of up to 3 inches possible. This will lead to significant and widespread ponding of water on streets, highways and areas that have poor drainage. In addition, there’s also the possibility for minor river and stream flooding. In particular, the Connecticut River is of concern to at least see minor amounts of flooding due to the combination of heavy rain and snow melt in Vermont and New Hampshire contributing to the river rising with these river rises moving downstream into Western Mass. A “Flash Freeze” With Very Icy Conditions Expected By Friday Evening: The rush of Arctic air will push into the area from southwest to northeast, first across Western Mass during the late afternoon hours of Friday and then across Central Mass during the early afternoon hours. This will lead to both a rapid drop in temperatures and also the possibility of a brief period of snow across the area during the late afternoon and evening hours of Friday with a dusting of snow possible. This rapid drop in temperatures could lead to a “flash freeze” of everything with very icy conditions possible. Current indications reveal that temperatures will fall below freezing across Western Mass by about 5-6 pm and then across Central Mass around 6 pm or so on Friday. This means that extreme caution is going to be needed if you are out and about after 5-6 pm Friday. Why am I so concerned about how quickly it’s going to become icy? It’s because the temperatures will fall from about 40-45 Degrees at 4 pm to 25-30 Degrees by 6 pm to 20-25 Degrees by 7 pm across Western Mass. Across Central Mass, I’m forecasting that temperatures will fall from about 40-45 Degrees around 4 pm to about 35 Degrees by 6 pm to near 25 Degrees by 7 pm. This almost immediate 10 degree drop in temperature to well below freezing will cause water on streets, highways, parking lots and driveways to freeze almost immediately leading to very icy conditions and thus, this is why it’s called a “flash freeze”. So, Let’s Break It Down A Little More In Terms Of Details: Thursday Night: Rain is expected to overspread Western Mass around the 6-7 pm time frame Thursday evening and then begin across Central Mass by about 7-8 pm Thursday evening. The rain is then expected to become heavy at times across the entire area by midnight. Heavy rain is then expected after midnight on Thursday night across the entire area. Temperatures will rise from the mid to upper 30s during the evening to the mid to upper 40s by Friday morning. Winds on Thursday night will be East to Southeast and increase from 10 to 20 mph during the evening to 15 to 25 mph with gusts to 40-45 mph late at night. Friday: Heavy rain is expected throughout the morning, which will become more showery in nature during the afternoon. The heavy rain during Thursday night and Friday is very likely to lead to street, highway and poor drainage flooding. In addition, there’s the possibility for some stream and river flooding across the region. As we get into late Friday afternoon, the rain will change to some snow by about the 5-6 pm time frame. In addition, a rapid drop in temperatures to well below freezing will lead to a “flash freeze” of everything with very icy conditions expected, first across Western Mass by about 5-6 pm and then across Central Mass around 6 pm or so. To make things even more icy, any snow that falls on ice will lead to even more slippery conditions during Friday evening. Any snow looks to come to an end by about midnight Friday night with a dusting of snow expected. It’s also expected to be very windy throughout Friday and Friday night. During the day Friday, South to Southeast winds of 20 to 30 mph with gusts to 50 mph are expected. An enhanced period where wind gusts of up to 60 mph looks possible during the mid and late afternoon hours on Friday. On Friday night, Southwest winds of 20 to 30 mph with gusts to 50 to 60 mph are expected during the evening and Southwest winds of 20 to 30 mph with gusts to 40 to 50 mph are expected after midnight. The strong winds on Friday and Friday night could lead to downed trees, downed power lines and power outages. High temperatures during the day Friday will be between 55 and 60 Degrees with temperatures rapidly falling to near 30 Degrees by 6 pm or so Friday. Low temperatures Friday night will be between 10 and 15 Degrees and this means that everything will be frozen solid by sunrise Christmas Eve morning. Christmas Eve & Christmas Day: Christmas Eve is expected to be partly sunny, windy and bitterly cold with high temperatures struggling to make it to between 20 and25 Degrees. Wind chill temperatures will hover between Zero and 10 Degrees all day long. Christmas Day looks sunny to partly sunny, windy and cold with high temperatures near 25 Degrees. Monday & Tuesday: Monday looks partly sunny with high temperatures near 30 Degrees. Tuesday is expected to be partly sunny with high temperatures near 35 Degrees.

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For Tonight & Wednesday: An area of high pressure will control the weather throughout tonight and Wednesday. This means that clear to partly cloudy skies are expected tonight with low temperatures between 15 and 20 Degrees. Winds will be Northwest at 5 to 10 mph. Wednesday will be a sunny day with high temperatures between 35 and 40 Degrees. Winds will be West at 5 to 10 mph. Thursday: Even though Thursday will be dry across the region, clouds will begin to increase as a strong low pressure system moves across the Great Lakes and Ohio Valley region. High temperatures will be between 40 and 45 Degrees. Winds will be East at 5 to 10 mph. A Strong Storm System Will Bring Heavy Rain, Strong Winds On Thursday Night & Friday & Then A “Flash Freeze” Occurring Friday Evening: A strong storm system is expected to track from the eastern Ohio Valley on Thursday evening to western New York State by Friday morning. This storm system is then anticipated to move into Quebec province during Friday afternoon and evening. This storm is expected to bring significant impacts in the way of heavy rain with flooding, strong winds, which could lead to downed trees, power lines with power outages and finally a “flash freeze” at the end of the storm, which looks to lead to very icy conditions Friday evening through the overnight hours of Friday night. Here Are The Latest Details On This Storm System: Thursday Night: Rain is expected to overspread Western Mass early Thursday evening and then begin across Central Mass by about 10 pm or so. The rain is then expected to become moderate to heavy at times across the entire area after midnight Thursday night. Temperatures will rise from the mid to upper 30s during the evening to the mid to upper 40s by Friday morning. Winds on Thursday night will be East to Southeast and increase from 10 to 20 mph during the evening to 15 to 25 mph with gusts to 35 mph late at night. Friday: Rain is expected throughout the day on Friday and it will be heavy at times. Rainfall amounts of around 2 inches are expected with this storm. Because of these heavy rainfall amounts, street, highway and poor drainage flooding is expected. In addition, there’s the possibility for some stream and river flooding across the region and this is something that’ll need to be watched very closely. Also, it’s expected to be very windy throughout the day on Friday with Southeast winds of 20 to 30 mph with gusts to 40 to 50 mph. This could lead to downed trees and power lines with power outages a possibility. It should be noted that a period of wind gusts of up to 50-60 mph is a possibility during the late afternoon and evening hours and this could enhance the threat for downed trees, downed power lines and power outages. High temperatures will be between 55 and 60 Degrees. A “Flash Freeze” Is Expected Friday Evening With Very Icy Conditions Expected: On the backside of this strong storm system, it’s expected that a rush of Arctic air will move into the region Friday evening leading to a rapid drop in temperatures. In addition to this, a brief change to snow is also possible Friday evening with a dusting of snow possible before all precipitation ends by midnight. This rapid drop in temperatures could lead to a “flash freeze” of everything with very icy conditions possible. Current indications reveal that temperatures will fall below freezing across Western Mass by about 5-6 pm and then across Central Mass by about 7 pm. This means that streets, highways, parking lots and driveways may be very icy during Friday evening and throughout the overnight hours of Friday night. This means that extreme caution is going to be needed if you are out and about after 5-7 pm Friday. How fast will the temperatures fall? Well, I’m expecting that across Western Mass temperatures will fall from the low 50s around 4 pm to the low 30s by 6 pm to the low 20s by 8 pm. Across Central Mass, I’m forecasting that temperatures will fall from the upper 40s to low 50s around 5 pm to the mid 30s by 6 pm to the mid 20s by 7 pm and then to the low 20s by 8 pm. Once the temperatures rapidly fall on Friday evening, expect a deep freeze by Saturday morning with low temperatures between 15 and 20 Degrees. Finally, it’s expected to continue to be very windy on Friday night with Southwest winds of 20 to 30 mph with gusts to 50 mph throughout the night. This means that a continuing threat for downed trees, downed power lines and power outages are expected. Christmas Eve & Christmas Day: Even though it’s not going to look like a Christmas postcard, it sure is going to feel very much like Christmas this weekend. Christmas Eve is expected to be partly sunny, windy and cold with high temperatures struggling to make it to between 25 and 30 Degrees. Christmas Day looks sunny to partly sunny, windy and cold with high temperatures between 25 and 30 Degrees.

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For This Afternoon: A west to northwest wind flow over the region will produce a mixture of sunshine and clouds this afternoon. In addition, a couple of snow showers are possible. Temperatures will be between 35 and 40 Degrees. Winds will be West at 10 to 20 mph with gusts to 30 mph. Tonight Through Tuesday: An area of high pressure will gradually build into the region tonight and Tuesday. Skies will start out tonight partly cloudy, but will become clear after midnight. Low temperatures will be between 20 and 25 Degrees. Winds will be Northwest at 10 to 20 mph. Tuesday is expected to be a sunny day with high temperatures between 35 and 40 Degrees. Winds will be Northwest at 8 to 16 mph. Wednesday: That high pressure system will continue to control the weather during Wednesday with sunny to partly sunny skies expected. High temperatures will be between 35 and 40 Degrees. Winds will be Northwest at 5 to 10 mph. Thursday: Even though Thursday will be dry across the region, clouds will begin to increase as a strong low pressure system moves across the Great Lakes and Ohio Valley region. High temperatures will be between 40 and 45 Degrees. A Wind-Swept Heavy Rain Is Expected From Thursday Night Through Friday Until Friday Evening: A strong storm system is expected to track from the eastern Ohio Valley on Thursday evening to western New York State by Friday morning. This storm system is then anticipated to move into Quebec province during Friday afternoon and evening. Given the expected storm track that’ll be to the west of our area, it looks very likely that we’ll be on the mild side of the storm system. Because of this, it appears that a majority of the precipitation type with this storm will be in the form of rain. In addition, there is likely to be quite a bit in the way of wind with this storm system, both on the front side and the back side. So, a wind-swept heavy rain looks very likely with this system, especially during the worst time of the storm, which looks to be during the day on Friday. The strong winds could also lead to downed trees and power lines with power outages a possibility, especially on Friday afternoon and Friday night. Once that storm system pulls into Quebec province by Friday evening, it’ll pull in some very cold air for Friday night. This looks to lead to a rapid drop in temperatures Friday evening leading to the potential for a “flash freeze” of everything. This means that any water leftover from the rain will freeze up rapidly leading to very icy conditions Friday night. Here Are The Specific Details: Rain overspreads the entire area during Thursday evening with the rain gradually increasing in intensity by morning. Temperatures Thursday night will rise from the mid 30s in the evening into the 40s late at night. Winds will be East to Southeast at 10 to 20 mph with gusts to 30 mph. On Friday, expect rain all day long and it’ll be heavy at times. Be aware that street, highway and poor drainage flooding is very likely. In addition, there’s also the chance for a thunderstorm or two during the afternoon and evening, especially given the very strong dynamics of this storm. It’ll also be very windy on Friday with Southeast winds of 15 to 25 mph with gusts to 40-45 mph. High temperatures will be between 50 and 55 Degrees. Rain, which will be heavy at times, looks to continue through Friday evening before it ends around midnight or so. It’s possible that the precipitation could end as a brief period of snow and this is something that’ll need to be watched. Once the rain ends, expect a very rapid fall in temperatures just after midnight Friday night with the potential for a “flash freeze” of everything. It’ll also continue to be very windy on Friday night with South to Southeast winds of 20 to 30 mph with gusts to 50 mph in the evening and West to Southwest winds of 20 to 30 mph with gusts to 50 mph after midnight. Temperatures on Friday night will start out in the 50s during the evening, but looks to rapidly drop to near 25 Degrees within about a 2 hour time period just after midnight Friday night. By sunrise Saturday morning, temperatures across the area will be between 20 and 25 Degrees. Total rainfall amounts from the Thursday night to Friday evening storm is expected to be in the 1 to 2 inch range. Christmas Eve & Christmas Day: Even though it’s not going to look like a Christmas postcard, it sure is going to feel very much like Christmas this weekend. Christmas Eve is expected to be partly sunny, windy and cold with high temperatures struggling to make it to 30 Degrees. Christmas Day looks sunny to partly sunny, windy and cold with high temperatures between 25 and 30 Degrees. Thank You: As always, I thank you for your continued support. If it were not for you, I would not be able to do a job that I love so very much – forecasting the weather for Western and Central Mass. Please help us alleviate the costs required for producing these weather forecasts for Western and Central Mass by donating. Thank you so much in advance!! MAKE A DONATION TO SUPPORT ROUTE 20 WEATHER- https://www.paypal.com/paypalme/Route20Weather?locale.x=en_US I Also Accept Donations Through Venmo. My Venmo Id is @Robert-Lightbown

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