New England Weather Discussion

(With thanks to the surrounding National Weather Service Offices)

Current Weather Readings:

(FYI: The number in parenthesis below is the change in the last hour)

• Time of the readings below: 21 Jan 2025 9:54 PM

• Current Temperature: 0.7°F (-3.8)

• High Temperature for today: 14.5 at 1:47 PM.

• Low Temperature for Today: -0.8 at 7:26 AM.

• Rainfall Today: 0.00 inches

• Current Dewpoint Temperature: -4.8°F (-2.6)

• Hours of Daylight Tomorrow: 9:35

• Lowest Windchill Reading Today: -4.8 at 6:28 AM 

  Find ALL of my instrument readings here

  Last Complete Site Update: 1/21 - 5:05 PM

  

  The Spring Outlook will be available sometime in the weeks ahead.

  Rich`s Weather Discussion

  A bitter cold night ahead with most of us below zero air temps. This will be followed by a frigid Tuesday morning with some wind driving wind chill temps as low as -15F here in some southern NH locations.
  In fact, I do not see the temperatures rising above freezing until next Sunday at the earliest.
  I also do not see any storms in that that time period, at the moment. 
  Time to settle down in front of the fireplace and open that good book you got at Christmas.
  
  On this day in 1908, New York City enacted the Sullivan Ordinance, which made it illegal for women to smoke in public. This ordinance was proposed by Alderman Timothy "Little Tim" Sullivan, who had never actually witnessed a woman smoking in public.
  
  

  **NEAR TERM (Until 6 AM Wednesday Morning)**
  Mid and high clouds streaming across the south and coast, associated with an upper-level jet, will move eastward this evening. Additionally, daytime heating-driven (diurnal) stratocumulus clouds will dissipate. The mountains may hold onto some clouds a bit longer but should eventually clear out.
  
  Winds will weaken after sunset, creating ideal conditions for heat to escape the surface (radiational cooling), especially with the newly fallen snow. Based on observations from last night and this morning, as well as dew points being lower than this time yesterday, forecast lows are colder than all guidance suggests. Temperatures are expected to range mostly from 5 to 10 degrees below zero, with some typically colder locations potentially dropping to 10 to 15 degrees below zero. In the mountains, lows are forecast between 10 and 20 degrees below zero. Wind chills may make it feel even colder, so a Cold Weather Advisory has been issued for Coos County, New Hampshire, and the Western Maine Mountains.
  
  An upper-level wave will pass through tonight without much impact, as there is no moisture for it to interact with.
  
  **SHORT TERM (6 AM Wednesday Morning Through 6 PM Wednesday)**
  High pressure will build toward the Eastern Seaboard on Wednesday as the upper-level wave exits. The cold and dry air mass will persist. Winds will be less breezy compared to Tuesday but could still gust up to 15 to 20 miles per hour. Expect mostly sunny skies, with increasing mid and high clouds late in the afternoon ahead of an approaching upper-level trough over the Great Lakes.
  
  By Wednesday evening and overnight, clouds will lower and thicken ahead of the upper trough, influencing how cold it gets. Temperatures are expected to stabilize or even rise slightly later in the night, but the timing of this warming remains uncertain. There may still be some early evening cooling. Forecast lows range from the positive single digits to teens south of the mountains, while in the north, temperatures could dip into the negative single digits to lower teens.
  
  A few flurries are possible, but the lower atmosphere will remain dry. However, near the Midcoast, winds may pull additional moisture from the ocean, so a 20 percent chance of precipitation has been included there.
  
  **LONG TERM (Wednesday Night Through Tuesday)**
  **Key Message:** While temperatures will be warmer than the past few days, they will remain near or below normal through the extended period. Offshore winds will dominate, and below-normal precipitation is expected.
  
  **Impacts:** No significant weather impacts are anticipated through early next week.
  
  **Forecast Details:** The pattern will continue to feature near or below-normal temperatures with more westerly winds than usual for this time of year. These winds will bring continental air, resulting in drier conditions. Limited Pacific moisture may bring occasional upslope snow showers, and shortwaves (upper-level disturbances) may trigger more widespread snow showers. Current indications suggest this could occur around Monday.
  
  Friday night minimum temperatures have been adjusted slightly lower, aligning closer to guidance, as there is evidence of surface high pressure building into the region before the next upper-level trough develops. Otherwise, no major changes were made to the forecast.
  
  

  Forcaster`s Discussion
  

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  Regional Synopsis

  New Hampshire and Maine

  SYNOPSIS...
  Bitterly cold air remains entrenched across New England for the next couple of days. Tonight will be another clear and mostly calm one, allowing temperatures to fall below zero for most locations and double digits below zero in the northern valleys. Temperatures will slowly moderate the rest of the week with chance for snow showers at times but not much more than that.
  

  Massachusetts

  SYNOPSIS... An arctic airmass will persist through Wednesday night with moderating temperatures Thursday into the weekend although still below normal temperatures. An ocean storm tracking well south of New England may bring light snow accumulations to the outer Cape and Islands tonight followed by clearing Wednesday. Generally dry conditions are expected during the end of the week and into next weekend, but we will have to watch another distant ocean storm Thursday night which could bring light snow to SE New England if it tracks further north and west.
  
  NEAR TERM /UNTIL 6 AM WEDNESDAY MORNING/...
  
  Key Messages
  
  * Cold Weather Advisory in effect once again for the eastslopes of The Berkshires with wind chill temperatures falling to -15F or less
  
  * 1 to 3 inches of snow accumulation expected for Cape Cod and The Islands
  
  Tomorrow and Tomorrow Night
  
  Key Messages
  
  * Bitter cold continues tomorrow and tomorrow night
  
  LONG TERM /THURSDAY THROUGH TUESDAY/...
  Key Messages:
  
  * Other than passing snow showers Thurs night/Fri and possibly again on Sun/Sun night, dry weather is expected.
  
  * Recovery in temps closer to seasonable Thurs, then cooling off to below normal levels Fri and Sat before rebounding back to near/slightly above normal for Sunday.
  
  * Early next week outlook favors continued drier but cooler than normal weather.
  
  

See the current readings from my weather instruments here in Peterborough, NH by clicking on the Weather Vane Below.

Weather History for Today