Updates twice per day, weekdays, by 7:30AM and again by 7:30PM.
9AM and 7PM on Weekends.
Forecasts are for Southern NH (Nashua) to Keene NH with other locations noted.
(PB = Peterborough, NH) - (KE = Keene, NH)
The Weekend Outlooks are added every Thursday morning. (Forecasts through Sunday)
All areas. Use the wobbling button below
Wind Chill Watches - Use the button below
Scattered snow showers between 3am and 4am. Partly cloudy, with a low around 11. Southwest wind 5 to 15 mph becoming northwest after midnight. Winds could gust as high as 30 mph. Chance of precipitation is 30%.
Scattered snow showers between 2am and 4am. Partly cloudy, with a low around 5. Wind chill values as low as -3. Southwest wind 10 to 15 mph becoming northwest after midnight. Winds could gust as high as 30 mph. Chance of precipitation is 30%.
Sunny, with a temperature falling to around 3 by 5pm. Wind chill values as low as -18. Blustery, with a northwest wind 15 to 20 mph, with gusts as high as 35 mph.
Sunny and cold, with a temperature falling to around -3 by 5pm. Wind chill values as low as -26. Blustery, with a northwest wind 15 to 20 mph, with gusts as high as 35 mph.
Mostly clear, with a low around -12. Wind chill values as low as -37. Blustery, with a northwest wind 15 to 20 mph, with gusts as high as 40 mph.
Partly cloudy, with a low around -16. Wind chill values as low as -43. Blustery, with a northwest wind 20 to 25 mph, with gusts as high as 40 mph.
Sunny, with a high near 14. Wind chill values as low as -33. West wind 10 to 15 mph, with gusts as high as 30 mph.
Sunny and cold, with a high near 10. Wind chill values as low as -39. Blustery, with a west wind 15 to 20 mph, with gusts as high as 30 mph.
Mostly cloudy, with a low around 8. South wind 5 to 15 mph, with gusts as high as 20 mph.
Mostly cloudy, with a low around 4. South wind 10 to 15 mph, with gusts as high as 25 mph.
Mostly cloudy, with a high near 42. Breezy.
Mostly cloudy, with a high near 38. Breezy.
Mostly cloudy, with a low around 26.
Mostly cloudy, with a low around 25. Breezy.
Mid to upper level clouds continue to stream across the area this afternoon, with a few scattered snow showers across far northern areas. Some decrease in cloud cover is expected this evening before an arctic frontal boundary approaches the area. Temperatures remain fairly mild most of the night ahead of the front, with temps in the mid 20s to low 30s. BTW, the Ground Hog did see his shadow today. The GH has a 40% accuracy rating over the past 20 years.
From the NWS:
***ONCE IN A GENERATION COLD WIND CHILLS POSSIBLE FRIDAY NIGHT INTO SATURDAY***
Things change in a hurry after midnight with the arrival of the much talked about arctic front. Scattered snow showers and squalls are likely through the mountains late this evening and a couple hours after midnight with the passage of the arctic front. These quickly diminish in intensity as they move past the mountain, with only scattered snow shower activity making it down wind of the mountains later tonight.
Temperatures quickly tumble behind the front on a gusty northwest wind. Temperatures are expected to fall to near -10 degrees along the Canadian border by sunrise tomorrow, with wind chills falling below -30. Closer to the coast, temperatures will be falling into the single digits during this timeframe with wind chills approaching -10. Sustained winds around 20mph are expected, with gusts around 30mph.
Temperatures continue to steadily fall during the daytime tomorrow, with temps falling below zero along the coast during the afternoon hours and wind chills in the -20s. Temps near -20 with wind chills around -40 expected across northern areas during this timeframe.
Temperatures continue to fall tomorrow night as the cold becomes downright dangerous. The center of the polar vortex is expected to cross the area late tomorrow evening and shortly after midnight, with temperatures dropping through after midnight.
An unusual phenomena for our area is possible tomorrow night, with guidance indicating that the tropopause could dip below the peak of Mount Washington tomorrow night. While extremely rare, the impact of this is that winds are likely to increase during the overnight as the the wind becomes more compressed through the lowest levels of the atmosphere. Combined with the bitterly cold temperatures, wind chill values likely fall to as low as -60 across northern areas, and -40 to -45 along the coastline. Although unofficial, from the records we have been able to gather, the coldest wind chill in Portland since 1948 was -43 degrees in 1971, so we are nearing wind chills values that most have not seen in their lifetime.
The danger of the this cold needs to be emphasized. Time for frostbite to develop in these conditions is 10 minutes or less, and 5 minutes or less with wind chill values below -50. Traveling tomorrow night could become deadly should vehicle troubles arise. Cars have more problems in the cold weather, whether its from dead car batteries, diesel fuel gelling in diesel equipment, or significantly reduced range in electric vehicles. People should dress and pack clothing to survive the temperatures outdoors, not for inside the car or for where they are planning on traveling. Cell phone batteries can also die very quickly in the cold, so these may not work properly once exposed to the cold for a few minutes.
Additionally, wind gusts to 40mph tomorrow night could cause a few power outages, especially in and around the mountains. While outages are expected to remain widely scattered, anyone that does lose power and does not have a back up heating system will see their indoor temperatures quickly fall and the risk of frozen pipes quickly increase. Now is the time to know where your water shutoff is located and to have a plan should you lose power.
A very cold start to the extended is expected Saturday as a highly anomalous cold air mass will be overhead. Winds will remain quite strong Saturday morning still, so wind chill values will greet the day well below -30F. Winds will diminish during the afternoon hours. Dry weather is expected.
The good news is that this air mass is fleeting. Rapid Warm Air Advection takes place Saturday night and Sunday as a warm front lifts northward. A few snow showers may occur with the front, especially in the north. Temperatures Sunday will experience quite the rebound, with highs in the 20s north and 30s/40s south. It`ll probably feel like "summer" Sunday afternoon to many folks.
A cold front moves through Monday but it will be nothing like the one coming through late tonight. Highs Monday will be in the 35 to 45 degrees range for most locations along with some mountain snow showers possible.
High pressure moves overhead Monday night into Tuesday before moving offshore Tuesday afternoon and night. Most guidance expects a short wave trough to move through late Tuesday and Tuesday night with a chance of rain and snow showers.
The next chance of appreciable precipitation looks to arrive Thursday or Friday, with confidence in time of arrival quite low at this time.
Record Cold High Temperatures
Portland Concord Augusta
Sat 4th 9 (1948) 4 (1908) 6 (1963)
Record Low Temperatures
Portland Concord Augusta
Sat 4th -19 (1971) -24 (1898)-14 (1971)
Sun 5th -13 (1978) -16 (1978) -10 (1996)
Last Date Since High Temperature <= 10 F
PortlandJan 06 2018 (4 F)
ConcordJan 15 2022 (8 F)
AugustaJan 15 2022 (10 F)
Last Date Since Wind Chills <= -35 F *
PortlandJan 04 1981 (-36 F)
ConcordFeb 13 2016 (-39 F)
AugustaJan 16 2004 (-37 F)
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An Arctic front will cross the area tonight bringing snow showers with potential for squalls in the mountains. The coldest airmass of the season follows Friday into Saturday with dangerously cold windchills setting in Friday into at least Saturday morning. Temperatures quickly moderate Sunday with above normal temperatures favored into the middle of next week. There are no signals for significant widespread precipitation with the best chances for some widespread snow or rain showers arriving late Tuesday into Wednesday.
An arctic cold front crosses the region overnight with perhaps a few brief snow showers or even snow squall surviving the southward push into southern New England. A dangerously cold arctic airmass invades the region Friday into Friday night with strong winds and the potential for isolated power outages. Ocean effect snow showers are also expected to develop across the outer-Cape. Temperatures rebound quickly Sunday with continued warming trend into early next week.
NEAR TERM /UNTIL 6 AM FRIDAY MORNING/...
* Arctic cold front crosses the region between midnight & 6 AM with
35 to 45 mph wind gusts and perhaps up to 55 mph in higher terrain
* Main risk of snow squalls will be to our north, but a few snow
showers & perhaps an isolated squall may survive into our region
SHORT TERM /6 AM FRIDAY MORNING THROUGH FRIDAY NIGHT/...
* Temps plunge Fri into the single digits by afternoon
* Dangerously cold wind chills of 20 to 45 below late Fri/early Sat
* Wind gusts of 35-55 mph may result in isolated power outages
* Ocean effect snow showers later Fri/Fri night for the outer-Cape
LONG TERM /SATURDAY THROUGH THURSDAY/...
* Dangerous cold with gusty winds diminishing Sat.
* Temperatures rebound nicely on Sun, but gusty winds return. Could
see a few light rain showers late Sun into early Mon.
* Dry and quiet weather Mon and for much of Tue with the warming
temp trend continuing. Another shot for showers late Tue-Wed as a
front passes through. Remains mild.
See the current readings from my weather instruments here in Peterborough, NH.
Click on the Wind Vane to see Live Weather Info
Quiet and storm-free before a shot of arctic air arrives Friday. Dangerously cold wind chills are possible to start the weekend.
Thursday, Groundhog Day, will be partly sunny, a bit breezy, and a touch warmer with temperatures back in the 30s.
A short but intense blast of bitter cold air works in late week. Wind chills at their lowest Friday night into early Saturday morning could drop to between 50 and 30 below zero statewide. Frostbite can occur in a matter of just several minutes under these extreme conditions.
Outside of a brief snow shower or squall late Thursday night into early Friday morning, the weekend will be dry until Sunday when a few snow showers will be possible (mostly northern and western areas). Sunday we go back to slightly above average highs in the upper 30s.
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