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: 23 Mar 2025 10:09 PM

• Current Temperature: 28.2°F (-0.3)

• High Temperature for today: 37.1 at 5:10 PM.

• Low Temperature for Today: 22.1 at 7:00 AM.

• Rainfall Today: 0.00 inches

• Current Dewpoint Temperature: 13.3°F (0.2)

• Hours of Daylight Tomorrow: 12:20

• Lowest Windchill Reading Today: 13.4 at 8:29 AM 

  Find ALL of my instrument readings here

  Last Complete Site Update: 3/23 - 5:29 PM

  

  On April 4 of 2024 I recorded 9.5 inches of snow here in Peterborough, NH. Winter is not over just yet.
  

  Rich`s Weather Discussion

  Clouds will be on the increase tonight as a storm system tracks across the region on Monday.
  We have slowed the approch of this storm, which now looks like rain/snow will break out mid to late morning. This means accumulations will depend on snowfall rates during the daytime, especially with the influence of a higher sun angle.
  Also, low pressure development offshore will now mean heavier snowfall is expected in northeastern areas where a winter weather advisory is now active.
  This all ends as rain Monday evening with dryer conditions following on Tuesday.
  A weak system bring Snow/Rain showers mid week.
  See the advisory section for details.
  
  Snow estimates are posted in Weather Graphic 1 below as well as above. They do differ in amounts.
  Stay tuned.
  
  On this day in 1857, Vermont inventor Elisha Otis installs the first commercial elevator in an upscale department store in New York City. Steam-powered, it moved just 40 feet per minute and had a safety catch to prevent falling-if the rope broke.
  

  NEAR TERM, UNTIL 6 AM MONDAY MORNING
  
  High pressure will continue building in from the west this evening and will settle over the region tonight. This will allow winds to diminish, leading to several hours of radiational cooling in sheltered areas. Clouds will increase from west to east after midnight as low pressure approaches from the Great Lakes.
  
  Low temperatures will drop to the teens in areas favorable for radiational cooling, while other locations will see lows in the mid to low 20s. Some light snow may develop across western New Hampshire around daybreak, although the latest round of numerical weather prediction models suggests snow will not start until mid-morning Monday.
  
  SHORT TERM, 6 AM MONDAY MORNING THROUGH MONDAY NIGHT
  
  The latest model guidance from this afternoon shows increased precipitation amounts for this early spring snow event on Monday. Models now indicate a secondary low-pressure system forming near the coast of Maine during the day Monday. This development will help keep temperatures in the lower atmosphere cold enough to support accumulating snow from mid-morning through the evening commute.
  
  Small-scale weather models show frontogenetic forcing, or Fgen, developing around 5,000 feet above sea level during the early afternoon. This forcing will extend from Carroll County across interior western Maine to central Maine Monday evening. It will provide enough lift to enhance snowfall rates within a moist dendritic growth zone, the atmospheric layer where snowflakes form efficiently. This setup could produce a band of moderate to heavy snow. The latest guidance from the Weather Prediction Center snow band tracker shows a strengthening signal for snow bands, with high-resolution models suggesting snowfall rates of one to one and a half inches per hour in some areas.
  
  As noted in previous discussions, the timing of this system has slowed, with most of the precipitation occurring from mid-morning through Monday evening. Despite colder trends in model data, temperatures near the surface will remain marginal, ranging from 33 to 35 degrees. Accumulations will depend on snowfall rates during the daytime, especially with the influence of a higher sun angle.
  
  A Winter Weather Advisory has been issued for Carroll County through interior western Maine, where the best chances exist for heavier snowfall rates and total accumulations between four and six inches. South of this advisory area, accumulating snow is still likely, creating slick travel conditions. However, temperatures will warm through the day, leading to a transition to rain.
  
  Across northern areas, an advisory has not been issued yet, as precipitation amounts decrease north of the mountains. These areas will remain all snow, with accumulations of two to four inches, with higher amounts in the mountains.
  
  Precipitation will taper off from southwest to northeast across New Hampshire between 5 PM and 7 PM, lingering across Maine past sunset. Drier air will move into southern areas Monday night, leading to partly cloudy skies, while clouds and snow showers may persist in the mountains overnight. Lows Monday night will range from the mid-20s in northern areas to the low 30s in the south.
  
  LONG TERM, TUESDAY THROUGH SUNDAY
  
  Overview:
  
  A cooler and more active weather pattern returns this week as a trough, or dip in the jet stream, settles into the Northeast. A developing low-pressure system moves through or near the Gulf of Maine on Wednesday, followed by a cold front on Friday. The active pattern continues into next weekend as warmer air begins pushing back into the region.
  
  Details:
  
  The upper-level low associated with Monday's system will linger just north of New England on Tuesday as it slowly moves east into the Canadian Maritimes. This will keep upslope precipitation?Äîwhich occurs when moist air rises along mountain slopes?Äîongoing across northern areas and higher terrain. Snow showers will continue, with some rain mixing in at lower elevations. South of the mountains, conditions will be mostly dry, although some clouds may drift southward during the day.
  
  Another disturbance moves through the trough on Wednesday, leading to the development of a coastal low off the Mid-Atlantic coast. The exact track and strength of this system remain uncertain, as models show significant differences in how it will evolve. This time of year, forecasting models often struggle due to a weakening jet stream and shorter atmospheric waves, which can cause rapid forecast changes. Given this uncertainty, details for Wednesday and Wednesday night remain unclear. At this point, there is a chance for rain and snow, with the highest likelihood of precipitation along the coast.
  
  The trough will persist over the region on Thursday, followed by a passing front on Friday that could bring another round of rain and snow showers. Cooler air will follow behind this front, keeping high temperatures on Saturday in the 30s and 40s.
  
  Looking ahead to next weekend, a push of warm air will move into the Northeast. However, this transition could bring unsettled weather, including mixed precipitation. It is too early to determine details, but next weekend appears to have the potential for active weather.
  

  Forcaster`s Discussion
  

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  Regional Synopsis

  New Hampshire and Maine

  SYNOPSIS... High pressure crests over the area tonight allowing winds to subside. Low pressure crosses the area from mid morning through Monday evening bringing accumulating snow and slick travel to much of the area with southern areas seeing snow change to rain. The system exits Monday night while troughing lingers over the Northeast through the middle of the week. Another system passes nearby offshore late Wednesday, bringing another chance of rain and snow. Conditions remain unsettled and relatively cool into next weekend.
  

  Massachusetts

  SYNOPSIS... Increasing cloud cover tonight as a frontal system spreads a round of interior snow to wintry mix into Monday morning, with plain rain expected for the coastal plain. A minor accumulation of snow and sleet is expected with very limited impacts Monday morning before transitioning over to plain rain in interior Southern New England. Drying out for Tuesday, but there is potential for another round of showers mid-week as a system tracks to the southeast of New England. Thursday trends drier with temperatures near to slightly below normal. A weak system brings chances for scattered showers Thursday night into early Friday.
  
  NEAR TERM /UNTIL 3 AM MONDAY MORNING/...
  415 PM Update:
  
  Key Messages:
  
  * Decreasing northwest wind gusts by sundown.
  
  * Increasing cloud cover overnight, with lows upper 20s to mid 30s before slowly rising into the pre-dawn hours.
  
  SHORT TERM /3 AM MONDAY MORNING THROUGH MONDAY NIGHT/... Key Messages...
  
  * Interior snow to wintry mix with minor snow accumulation before changing to rain. Other than a very brief period of wet snowflakes Monday morning, most of the coastal plain sees predominantly rain.
  
  * Gray/raw Monday for much of Southern New England with highs upper 30s to low 40s.
  
  LONG TERM /TUESDAY THROUGH SUNDAY/...
  Key Messages:
  
  * Potential for system to bring a round of showers Wednesday.
  
  * Scattered showers possible Thursday night into early Friday.
  
  * More unsettled weather possible for the weekend.
  
  

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

Weather History for Today