Updates twice per day, weekdays, by 8:00AM 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)
Hazardous Weather Outlook
National Weather Service Gray ME
542 PM EDT Thu May 19 2022
MEZ007>009-012>014-018>021-033-NHZ001>013-015-202145- Northern Oxford-Northern Franklin-Central Somerset-Southern Oxford- Southern Franklin-Southern Somerset-Interior York- Central Interior Cumberland-Androscoggin-Kennebec- Interior Cumberland Highlands-Northern Coos-Southern Coos- Northern Grafton-Northern Carroll-Southern Grafton-Southern Carroll- Sullivan-Merrimack-Belknap-Strafford-Cheshire-Eastern Hillsborough- Interior Rockingham-Western And Central Hillsborough-
542 PM EDT Thu May 19 2022
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.
Friday through Wednesday.
Hot over the weekend with afternoon highs ranging from the mid 80s in the north to the mid 90s in the south. A few strong to severe thunderstorms possible over the weekend.
Rain likely, mainly before 10pm. Patchy fog. Otherwise, mostly cloudy, with a low around 50. South wind around 5 mph becoming calm in the evening. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Rain and thunderstorms likely, mainly before 9pm. Patchy fog. Otherwise, mostly cloudy, with a low around 47. South wind around 5 mph becoming calm in the evening. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Patchy fog before 9am. Otherwise, partly sunny, with a high near 82. Calm wind becoming southeast around 5 mph in the afternoon.
Partly sunny, with a high near 80. Calm wind becoming south around 5 mph in the afternoon.
A 20 percent chance of showers after 9pm. Patchy fog after 3am. Otherwise, mostly cloudy, with a low around 60. South wind 5 to 10 mph.
Patchy fog after 2am. Otherwise, mostly cloudy, with a low around 59. South wind around 5 mph.
Patchy fog before 9am. Otherwise, cloudy through mid morning, then gradual clearing and hot, with a high near 97. Southwest wind 5 to 10 mph.
Patchy fog before 8am. Otherwise, mostly cloudy, then gradually becoming sunny and hot, with a high near 93. Southwest wind 5 to 10 mph.
Partly cloudy, with a low around 69. Southwest wind around 5 mph becoming calm in the evening.
Partly cloudy, with a low around 67. Calm wind.
A 30 percent chance of showers after 3pm. Mostly sunny and hot, with a high near 98.
A 40 percent chance of showers after 2pm. Mostly sunny and hot, with a high near 94.
A 30 percent chance of showers before 3am. Mostly cloudy, with a low around 65.
A chance of showers before 8pm, then a chance of showers and thunderstorms between 8pm and 2am. Mostly cloudy, with a low around 61. Chance of precipitation is 40%
Widespread rain will continue this afternoon into the mid evening, with patchy fog overnight.
Low pressure will continue to move across the area tonight, with rounds of rain showers continuing. The most widespread and heaviest showers are occuring now, with a rather ominous display on radar. What looks like a healthy squall line moved across NH earlier this afternoon, now moving across lower Maine. Precipitable water values aren`t as supportive for really efficient rain processes, but it is coming down at moderate to heavy rates at times.
Rain showers should become less frequent into the evening hours, with a weak boundary draped across southern NH. Some of the moderate showers may train along this through the evening, so places from Keene to Portsmouth may have a fairly damp evening.
Additionally, the back side of the low is advancing through upstate New York, but it is also firing some additional convection with lightning observed. These storms would track towards SW NH by early evening, and have included the mention of some thunder then. This would be a brief and small window of elevated instability, but with the cooler air aloft, can`t rule out some rumbles.
The main theme tonight will be the development of patchy fog for much of the forecast area. With widespread rainfall during the day and cooling temps overnight amid a moist airmass, expect this fog to not be confined to just mountain/river valleys. Lows fall into the mid 40s, cool and damp just before a hike towards hot temps this weekend.
Warming begins Friday, with warmer temps beginning a trek northward. Clouds will become more scattered during the day, especially in the southern half of NH. This should help temps climb to around 80 there.
Heading into Friday night, there is some discrepancy as far as rain chances among mid range guidance. What appeared to be a solid night of fog/drizzle once again, has shifted towards the potential for a Mesoscale Convective Complex (MCC - Bunch of thunderstorms) or nocturnal thunderstorms to traverse the forecast area amid ridging.
After this, the heat is on for the weekend. More on that in tonight’s Weekend Outlook e-mail blast.
Records at risk this weekend:
Temperatures will warm into the 90s Saturday and Sunday across
most of New Hampshire and parts of western Maine. Below are the
forecast high temperatures, and their records at our climate
Augusta, ME84/91 (1992)
Portland, ME82/91 (2009)
Concord, NH94/93 (1871)
Augusta, ME 87/94 (1992)
Portland, ME 84/90 (1992)
Concord, NH 95/98 (1911)
In addition, overnight lows Saturday night may also tie or set
record high minimums in southern NH. For Concord this is 66 set
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A weak frontal boundary pushes through this evening bringing showers to the area. Conditions improve overnight behind the front, bringing fair weather on Friday as temperatures trend above normal. This weekend is expected to be hot away from the coastline with a small chance for afternoon showers and storms, first in the mountains and then more widespread by Sunday as a cold front drops through the region. The start of the next work week will be marked by high pressure with cooler, and drier, weather expected. A cold front is then likely to cross the area late next week.
Any lingering showers taper off this evening as a weak high builds in. Areas of fog developing across the region and may be dense at times across the south coast. A significant warmup then begins Friday and cannot completely rule out a few showers/storms late on Friday. Midsummer heat and increasing humidity returns for the weekend. While chances for afternoon thunderstorms are limited to nil, better chances for rains exist late Sunday into Monday. A cooler, more seasonable air mass then returns for Tuesday into the middle of next week.
NEAR TERM /THROUGH TONIGHT/...
* Any lingering showers taper off during the evening. Clearing
skies with areas of fog developing across the region.
SHORT TERM /FRIDAY THROUGH FRIDAY NIGHT/...
* Generally dry and quiet weather with increasing cloud cover
late in the day. Temps climbing about normal.
* Not out of the question we see some showers/storms late on
Friday and Friday night, but lots of uncertainty here.
LONG TERM /SATURDAY THROUGH WEDNESDAY/...
* Summer heat and humidity makes its first appearance this weekend,
especially away from the coast. Heat-related headlines are likely.
* Limited chance for rain/thunder this weekend (mainly daytime
Sunday northern MA), with somewhat better chances later Sunday
* More seasonable air mass through midweek, with onshore flow and
potentially more clouds than sun.
See the current readings from my weather instruments here in Peterborough, NH.
Click on the Wind Vane to see Live Weather Info
A quick moving, weak system moves through New Hampshire today ahead of more summer heat, just in time for the weekend!
Today will be cooler with clouds and some showers around, with most of them during the late morning into the early evening. Highs will only be in the 55-62 range!
The showers will end this evening with some fog forming overnight. Lows will be in the 40s to lower 50s.
Friday will be brighter and warmer with highs in the upper 70s to very low 80s...except cooler (low to mid 60s at the coast).
Saturday and Sunday look to be hazy, hot, and humid with highs in the 87-94 degrees each afternoon, except cooler right at the coast. There could be a stray late day shower up north of Saturday then scattered showers/storms moving from northwest to southeast late Sunday and/or Sunday Evening.
A dry and cooler start and middle part of next week follows.
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