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 Apr 2025 7:05 PM

• Current Temperature: 64.6°F (-1.6)

• High Temperature for today: 67.7 at 4:29 PM.

• Low Temperature for Today: 43.9 at 5:41 AM.

• Rainfall Today: 0.00 inches

• Current Dewpoint Temperature: 33.3°F (0.3)

• Hours of Daylight Tomorrow: 13:48

• Lowest Windchill Reading Today: 43.9 at 5:41 AM 

  Find ALL of my instrument readings here

  Last Complete Site Update: 4/23 - 6:00 PM

  

  A quiet night ahead. Nice again Thursday.

  Rich`s Weather Discussion

  I am expecting a new computer by Friday. After it arrives there will be disruptions to the site update schedule, updates, my weather instrument feeds, etc.
  As anyone who has done a computer data migration is aware, these things can go easy, or be a mess. So FYI for now.
  The new website will go up once things settle down. 
  
  A quiet night ahead as high pressure continues to build into the Northeast.
  Another pleasant spring day is expected on Thursday with clouds begiining to increase Thursday night into Friday.
  Rain arrival holds off until latter Friday night.
  Saturday looks like a washout at the moment.
  
  Earlier Today: Dark smoke billowed near the Jersey Shore yesterday as a fast-moving wildfire forced thousands to evacuate and closed a portion of a major highway. The Jones Road Wildfire was sparked in the Greenwood Forest Wildlife Management Area close to Barnegat Township in Ocean County, and had burned 13.2 square miles of land by last night, according to officials with the New Jersey Fire Service, who said the fire is currently 10% contained. More than 1,300 structures were threatened, and around 3,000 residents have been evacuated.
  
  The pollen count is high. See the numbers in Weather Graphic #3.
  
  On this day in 2005, YouTube co-founder Jawed Karim uploaded the platform's first video, Me at the zoo, marking the humble beginnings of what would become the world's largest video-sharing site.
  

  Near Term Through Thursday
  
  Quiet weather is expected tonight with surface high pressure in control. Fog is not likely as temperatures will not reach the threshold for fog formation, known as the thermal cross-over temperature, which generally supports fog when lows fall into the lower 30s. Tonight will feature radiational cooling, which means the ground will lose heat due to clear skies and light winds near the surface. This setup is typical for spring in April.
  
  High pressure will gradually move south of Georges Bank in the Atlantic while a mid-level trough around 18000 feet high, technically a 500 millibar trough, moves over Quebec. Most areas will remain dry through the day Thursday, but rain shower chances increase in the late afternoon, especially across the northern half of the forecast area.
  
  Winds will shift to the south and southwest tomorrow, bringing in moisture from the Gulf of Maine. High temperatures in the mountains are expected to reach the upper 50s to low 60s. Coastal areas including Midcoast and the Kennebec Valley in Maine will also see temperatures in the low 60s due to winds coming off the water. Southern and south-central New Hampshire along with the Lakes Region of Maine will warm into the upper 60s to low 70s thanks to the southwest flow.
  
  Short Term Thursday Night
  
  Showers will continue into the evening with the possibility of isolated thunder, especially across northern areas where the temperature drop with height, known as mid-level lapse rates, supports instability. Most of the shower activity will wind down by midnight. Cloud cover overnight will help keep temperatures from falling too much, with lows mainly in the 40s.
  
  Long Term Friday Through Wednesday
  
  Overview: High pressure moves into the open Atlantic on Friday. A low pressure system will track through the Great Lakes and head toward New England Friday night into Saturday. This will bring the highest chance for rain during the forecast period before high pressure returns early next week.
  
  Details: Dry weather continues through Friday with high pressure holding over the open Atlantic. Clear skies and light winds may allow temperatures to fall into the upper 30s and lower 40s overnight due to decoupling, which means the surface and upper air layers stop mixing.
  
  A weak upper-level disturbance, known as a shortwave trough, will move across northern Maine Friday night, bringing a chance of scattered rain showers and possibly some thunder.
  
  By Friday afternoon, a return flow develops as low pressure enters the Great Lakes. There is high confidence that this system will eventually bring rain over the weekend. However, forecast models differ on the exact eastward movement of the system. Recent guidance is showing a trend toward a more defined and slower-moving upper-level feature, technically a 500 millibar shortwave, which could increase shower activity and even allow for some mountain snow showers on Sunday.
  
  Total rainfall estimates, known as Quantitative Precipitation Forecast or QPF, have increased slightly. Widespread amounts between three quarters of an inch and one inch are now expected. The potential for totals above one inch is showing up further north across the mountains according to the latest ensemble model data from 8 AM EDT.
  
  There is a possibility for embedded convective activity, which means areas of heavier showers due to elevated instability in the atmosphere. However, a strong flow of marine air at low levels will bring in a cool, damp layer from the ocean. Overall, Saturday is expected to be quite unpleasant. Showers are likely to linger into Sunday with partial clearing expected by Sunday afternoon.
  
  The start of next week looks dry and warmer, with temperatures running above normal.
  

  Forcaster`s Discussion
  

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  Regional Synopsis

  New Hampshire and Maine

  SYNOPSIS... A weak disturbance will bring the chance for showers tomorrow afternoon. The next chance of rain arrives this weekend as low pressure tracks near New England. Saturday looks to be widespread rain with a cool Sunday and lingering showers. Drier weather expected for the beginning of next week.
  

  Massachusetts

  SYNOPSIS...
  
  Chilly tonight as a result of radiational cooling. Pleasant and dry under high pressure continuing through Thursday, with the exception of a slight chance of showers Thursday evening/night across northern Massachusetts. Unseasonably warm on Friday before A system on Saturday brings the next chance for widespread rainfall, though exact details remain uncertainty. Drier conditions return late this weekend into early next week.
  
  NEAR TERM /UNTIL 6 AM THURSDAY MORNING/...
  
  Key Messages...
  
  * Clear skies, light winds, and cooler temps tonight.
  
  SHORT TERM /6 AM THURSDAY MORNING THROUGH THURSDAY NIGHT/...
  
  Short Term
  
  Key Messages...
  
  * Warmer, clear skies, and light winds for a pleasant Thursday.
  
  * Chance of showers Thursday evening north of the Mass Pike.
  
  LONG TERM /FRIDAY THROUGH WEDNESDAY/...
  
  Key Messages:
  
  * Unseasonably warm Friday
  
  * Soaking rain Saturday, but timing remains uncertain
  
  * Drying out Sunday with cool and blustery conditions
  
  * Mainly dry with warming temperatures Monday through Wednesday
  

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

Weather History for Today