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Mostly cloudy, warm & humid tonight - Chance of a shower

Mostly cloudy Tuesday, not as warm - Chance of afternoon showers

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If the button below is jiggling, an advisory is posted 
Quick Link to Your Three Day Forecast

New England Weather Discussion

Current Temperature: 74.9°F (-1.0) 
High Temperature for the day: 86.9°F
Rainfall Today: 0.00 inches

Current Dewpoint: 69.0°F (0.1)
Find all of my instrument readings here.
Last update: 6/21 - 5:49 PM

Claudette is in the Atlantic moving away from the USA. It looks like a cold front will drive south tonight and that will block Claudette from sending any rainfall our way. The NWS in Gray Maine has issue a Hazardous Weather Outlook for NH/ME. If you look at the Radar Page you will see numerous thunderstorms off to our northwest. Not clear if any of these make it here to Southern NH. It will be a close call.
Today was the first full day of Summer. Enjoy it!

Details:
Moderately unstable and well-sheared air mass in place across the forecast area as of this Monday afternoon. The atmosphere is ripe for severe thunderstorms. However, timing is an issue because the best forcing for ascent remains well to our west in the vicinity of the storms in western NY. This puts into question what our storm coverage will be over the next 8 hours or so. For the time being, strongest storms are likely to remain just north of our border with Canada as well as over upstate NY and Vermont. Cannot rule out isolated storms through 5PM but the vast majority of the forecast area will remain quiet.

As the evening begins, better lift will enter the forecast area from the west and should allow a few strong to severe storms to enter the watch area across northern and western NH. It`ll likely be even later for areas farther south and east. By then, heating will be done and the boundary layer should begin to stabilize somewhat. So if the convection currently to our west doesn`t organize greatly and have a well-balanced cold pool with it, the storms entering the CT River Valley south of the watch area will likely weaken and eventually dissipate as they potentially reach central NH. However, a few storms there could be severe upon entering the forecast area.

For southeastern NH and our Maine zones south of the mountains, the chances for thunder or much rain for that matter doesn`t look good. Storms should fall apart for the most part before entering these areas although a few rumbles will be possible prior to 1AM or so.
To summarize, the best chances for severe weather will be in the current severe thunderstorm watch area northeastward to the western ME mountains. The next best chance will be to the south of the watch area along the CT River. Damaging winds will be the main threat although heavy downpours and localized flooding will be possible if and where storms train across western zones. An isolated tornado cannot be ruled out.

Mostly cloudy skies are expected on Tuesday in the wake of a cold front that should have moved just offshore around 7AM. The question remains how much anafrontal precipitation will occur during the day? The solutions continue to vary with the 7Am models leading the pack with a good dose of rainfall Tuesday afternoon. Skies clear out Tuesday night as high pressure moves in.

A cold front will be well offshore Wednesday morning with breezy northwest winds ushering in cooler and drier air. Downsloping winds will allow coastal areas to be the warm spot with highs into the mid 70s there to upper 60s across the north. With mostly sunny skies and dewpoints in the 40s it will be a nice late June day. High pressure crests over the region Wednesday night. Clear skies and light winds will maximize what radiational cooling we can achieve on one of the shortest nights of the year with lows dropping to near 40F in the north to near 50F across the south.

Surface high pressure will build to our southwest Wednesday with cooler and much drier air funneling into northern New England on northwest winds. High pressure will crest over the area Wednesday night before settling offshore through the end of the work week. This will bring fair weather, comfortable humidity levels and temperatures in the upper 70s to low 80s with cooler conditions along the coast Thursday and Friday. Going into the weekend a long wave trough deepens to our west as heights rise along the west coast of North America. This will set up deep southwest flow allowing for temperatures and humidity to rise Saturday into Sunday. With the increasing heat and humidity will come the threat for showers and thunderstorms with the best chances for precipitation holding off until Sunday.

Join my email list and get the EVERY THURSDAY EVENING E-mail blast that details the upcoming weekend weather. Plan ahead for the upcoming weekend! This is the same list I use for Winter Storm Warnings, hurricane alerts, and other weather hazards.

Site News

NEW! See the new, redesigned Radar Page!
See how much rain we’ve received thus far in 2021.
The Tropic Section is now active.
Current Pollen Counts can be found in Weather Graphic 3
Drought map is updated every Thursday afternoon - Link
Take a look at Weather Graphics 1, 2, and 3 to the right.

Regional Synopsis

SYNOPSIS...
A cold front approaches from the west with showers and storms possible this evening. Some storms could be strong to severe, especially over northern and western areas. The cold front gradually pushes east out over the waters late Tuesday, then high pressure returns for a cooler and quiet end to the week. The heat and humidity begins to build once again this upcoming weekend.

SYNOPSIS...
Hot and very humid conditions today will be followed by showers and thunderstorms tonight into Tuesday. A few strong to severe storms cannot be ruled out. The heat and humidity break late Tuesday and Tuesday night, with much more seasonable and less humid weather Wednesday. Warmer and more humid conditions return Friday and the weekend.

Live Weather Readings

See the current readings from my weather instruments here in Peterborough, NH. 

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Regional Weather Discussions

Updated once in the morning-These are provided by the NWS, WMUR-TV, or me...

Hot and humid weather to start the work week. Showers and storms by later Monday night and Tuesday will provide some much needed rainfall, and bring in cooler and drier air. Sunny with a much more comfortable feel by mid-week.

Monday will be hazy, hot, and humid. Temperatures will surge into the low 90s while the humidity will make it feel like the mid 90s for some. There will be a small chance of an afternoon or evening scattered downpour or storm, mostly in far northern and western NH. Some of the storms, particularly north, could contain damaging wind gusts and small hail.

Scattered showers and storms overnight with lows in the 60s.

More cloudy with a few rounds of showers and t-storms Tuesday. There will likely be some peeks of sunshine. Highs in the 70s but still quite soupy humidity.

It turns cooler and brighter Wednesday with much more refreshing air returning for the rest of the week.

Your Daily Forecast

Three Days at a Time

Updates twice per day, weekdays, by 7:00AM and again by 7:30PM - 9AM/7PM on Weekends
Forecasts are for Southern NH (Nashua)  to Keene NH with other locations noted.
(PB = Peterborough, NH) - (KE = Keene, NH)

Warnings or Advisories

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Click on the button below to go to the Advisory depicted in the map above. When the button is jiggling, an advisory is active.

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Click on the button above when jiggling

0607%20Advisory%20MA

Hazardous Weather Outlook
Hazardous Weather Outlook
National Weather Service Gray ME
117 PM EDT Mon Jun 21 2021

MEZ007>009-012>014-018>022-033-NHZ004-006>013-015-221730-
Northern Oxford-Northern Franklin-Central Somerset-Southern Oxford-
Southern Franklin-Southern Somerset-Interior York-
Central Interior Cumberland-Androscoggin-Kennebec-Interior Waldo-
Interior Cumberland Highlands-Northern Carroll-Southern Carroll-
Sullivan-Merrimack-Belknap-Strafford-Cheshire-Eastern Hillsborough-
Interior Rockingham-Western And Central Hillsborough-
117 PM EDT Mon Jun 21 2021

This Hazardous Weather Outlook is for Maine, south central Maine,
southwest Maine, west central Maine, western Maine, New Hampshire,
central New Hampshire, northern New Hampshire and southern New
Hampshire.

This afternoon and tonight.

Thunderstorms may move in from the west this evening and possibly
produce torrential downpours and gusty to locally damaging winds.

What is the difference between these advisories?
watchwarnadv2

Monday

BlankDay


BlankDay
Peterborough/Keene:


BlanknightS

A 30 percent chance of showers, mainly after 2am. Mostly cloudy, with a low around 70. South wind 5 to 15 mph, with gusts as high as 20 mph. New precipitation amounts of less than a tenth of an inch possible.

nshra30PCloudy
Peterborough/Keene:

A 30 percent chance of showers, mainly after 2am. Mostly cloudy, with a low around 70. South wind 5 to 15 mph, with gusts as high as 20 mph. New precipitation amounts of less than a tenth of an inch possible.

Tuesday

BlankDay

Showers likely, mainly after 4pm. Mostly cloudy, with a high near 79. West wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

BlankDay
Peterborough/Keene:

Showers likely, mainly after 4pm. Mostly cloudy, with a high near 79. West wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

BlanknightS

A 30 percent chance of showers, mainly before 8pm. Cloudy during the early evening, then gradual clearing, with a low around 48. Northwest wind around 5 mph. New precipitation amounts of less than a tenth of an inch possible.

BlanknightS
Peterborough/Keene

A 30 percent chance of showers, mainly before 8pm. Cloudy during the early evening, then gradual clearing, with a low around 48. Northwest wind around 5 mph. New precipitation amounts of less than a tenth of an inch possible.

Wednesday

BlankDay

Sunny, with a high near 77. Northwest wind around 5 mph.

BlankDay
Peterborough/Keene:

Sunny, with a high near 77. Northwest wind around 5 mph.

BlanknightS

Clear, with a low around 50. West wind around 5 mph becoming calm in the evening.

BlanknightS
Peterborough/Keene:

Clear, with a low around 50. West wind around 5 mph becoming calm in the evening.

Thursday

BlankDay

Sunny, with a high near 82.

BlankDay
Peterborough/Keene:

Sunny, with a high near 82.

BlanknightS


BlanknightS
Peterborough/Keene:


Friday

BlankDay


BlankDay
Peterborough/Keene:


BlanknightS


BlanknightS
Peterborough/Keene:


Saturday

BlankDay


BlankDay
Peterborough/Keene:


BlanknightS


BlanknightS
Peterborough/Keene:


Sunday

BlankDay


BlankDay
Peterborough/Keene:


BlanknightS


BlanknightS
Peterborough/Keene:


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Regional Weather Discussions

Updated once in the morning-These are provided by the NWS, WMUR-TV, or me...

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See RichLefko.Com Instrument Weather readings at these services.

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