Point Forecast Updated Fri May 14, 2021 3:14pm EDT
High pressure will remain centered near southern New England over the next several days, resulting in mainly dry weather, warm afternoons, and cool nights. An isolated shower is possible most afternoons, with best chances for pop up showers or thunderstorms on Sunday and Monday. Even warmer temperatures and low humidity levels for the rest of the workweek. A few 80 degree days are looking more likely in interior New England by the middle of next week.
Lo 49 °F
Mostly cloudy, with a low around 49. West wind 2 to 6 mph.
Hi 77 °F
Sunny, with a high near 77. West wind 2 to 7 mph.
Lo 53 °F
Partly cloudy, with a low around 53. Southwest wind around 6 mph.
Chance Rain Showers
Hi 75 °F
A chance of rain showers between 10am and 1pm, then a chance of showers and thunderstorms. Partly sunny, with a high near 75. West wind 5 to 8 mph. Chance of precipitation is 50%. New rainfall amounts less than a tenth of an inch possible.
Chance Showers And T-Storms then Partly Cloudy
Lo 51 °F
A chance of showers and thunderstorms before 8pm. Partly cloudy, with a low around 51. Southwest wind 3 to 7 mph. Chance of precipitation is 30%.
Chance Showers And T-Storms
Hi 74 °F
A slight chance of rain showers between 10am and 11am, then a chance of showers and thunderstorms. Mostly sunny, with a high near 74. South wind 3 to 7 mph. Chance of precipitation is 50%.
Slight Chance Showers And T-Storms then Partly Cloudy
Lo 51 °F
A slight chance of showers and thunderstorms before 7pm. Partly cloudy, with a low around 51. Southwest wind around 6 mph.
Slight Chance Rain Showers
Hi 77 °F
A slight chance of rain showers after 9am. Mostly sunny, with a high near 77. Southwest wind 5 to 9 mph.
Slight Chance Rain Showers then Partly Cloudy
Lo 56 °F
A slight chance of rain showers before 10pm. Partly cloudy, with a low around 56. West wind around 8 mph.
Hi 81 °F
Mostly sunny, with a high near 81. West wind 7 to 10 mph.
Lo 57 °F
Mostly clear, with a low around 57. West wind 5 to 9 mph.
Hi 76 °F
Mostly sunny, with a high near 76. North wind 6 to 9 mph.
Lo 52 °F
Partly cloudy, with a low around 52. North wind 3 to 7 mph.
Hi 71 °F
Mostly sunny, with a high near 71. North wind 5 to 9 mph.
Updated Sat May 15, 2021 3:45am EDT
000 FXUS61 KBOX 150728 AFDBOX Area Forecast Discussion National Weather Service Boston/Norton MA 328 AM EDT Sat May 15 2021 .SYNOPSIS... High pressure will remain centered near southern New England over the next several days, resulting in mainly dry weather, warm afternoons, and cool nights. An isolated shower is possible most afternoons, with best chances for pop up showers or thunderstorms on Sunday and Monday. Even warmer temperatures and low humidity levels for the rest of the workweek. A few 80 degree days are looking more likely in interior New England by the middle of next week. && .NEAR TERM /UNTIL 6 PM THIS EVENING/... High pressure centered over the Appalachians will extend subsidence over Southern New England. Cross sections continue to show a layer of moisture between 850-mb and 650-mb, available to be converted to clouds when introduced to some lift. Solar heating during the day will generate that lift. So expect mostly sunny skies turning into partly sunny, but overall a dry weather day. Mixing yesterday was quite deep, reaching about 700-mb per the 00Z Albany sounding. If one allowed for near-adiabatic lapse rates, the mixing in that sounding would reach near 600-mb. As mentioned... deep. Temperatures at 700-mb today are forecast around -6C, equiv to +9C at 850-mb...which supports max temps in the mid 70s. Light winds may allow a sea breeze along the coast, which may generate cooler max temps. Will forecast highs in the 70s, cooler along the coast. The air itself will remain dry. Dew points in the 30s would create a temperature-dewpoint difference of nearly 40 degrees. Showers trying to fall through that should mainly evaporate on the way down. A very light shower or sprinkle might reach the ground, but little to speak of. && .SHORT TERM /6 PM THIS EVENING THROUGH 6 PM SUNDAY/... Overview...High pressure remains in place at the surface. But a weak shortwave aloft will race over New England later tonight and Sunday. Tonight... Enough moisture aloft for patchy clouds, but rather dry near the surface. So no forecast of showers...just a fair, dry night. Dew points will be in the 40s, so expect min temps in the 40s and low 50s. Sunday... Sunshine again kicks off heating of the air and development of diurnal clouds. Mixing will support max temps reaching the low to mid 70s. Much of the day looks dry, and the temperature- dewpoint difference will again reach 30 degrees. But other factors suggest a period of scattered or widely scattered showers during the afternoon. The heating, the lift from the passing upper shortwave, the lingering cold air aloft...minus 24C to minus 26C at 500-mb...and favorable stability parameters will assist in generating buoyancy. CAPE is forecast around 250 to 500 J/Kg, Lifted Index is forecast at minus 1 to minus 2. Total-totals are forecast in the mid 50s. With this instability in place, the forecast will continue to mention a chance of thunder. && .LONG TERM /SUNDAY NIGHT THROUGH FRIDAY/... Highlights... * Afternoon slow-moving sct showers/t-storms Mon in the interior. Brief gusts, small hail possible in stronger storms. Severe weather not expected. * Turning drier and even warmer most of the rest of the workweek. Low-mid 80s high temperatures in the interior Wed and Thurs, with comfortable humidity levels. Details: Sunday Night into Monday Night: The same general diurnal trends we've seen over the last several days will continue into Monday. Weak shortwave ridging Sunday night into early Monday weakens as another weak shortwave trough moves SE in NW flow. This should again lead to increased afternoon cloudiness with scattered showers and thunderstorms blossoming, following the diurnal trend. We still have fairly steep 700-500 mb lapse rates around 7 C/km, and while low-levels are still well mixed with an inverted-V look on GFS/NAM soundings, surface dewpoints are higher than prior days (mid 40s to low 50s). This generates higher surface-based CAPE values ranging from 800-1200 J/kg. With drier air in mid-levels, do have to watch CAPE values falling on the lower end of that range as dewpoints mix out/drop, which is the uncertainty in the convective forecast. Still should be enough for scattered storms that will be very slow moving, with less than 15 kt of flow progged through a deep depth of atmosphere. Strongest of storms capable of brief gusty outflow given the inverted-V profile, perhaps some small hail as well given low freezing levels/wet- bulb 0C heights. Thinking whack-a-mole SPSable type storms at worst, best chance in the interior and especially vicinity of the terrain. Showers/storms should fizzle after sundown toward mostly clear skies. With the slightly higher dewpoints, patchy fog possible for the South Coast and Cape Cod. Tuesday through Friday: Pattern amplifies across CONUS for much of the upcoming workweek. Most of the global NWP now feature a highly amplfied 500 mb ridge centered over the central Appalachians by Wed, with a ridge axis northward into Hudson Bay! West of the ridge axis in more conditionally unstable air, much of the Plains states should be rather convectively-active. While there are no synoptically-salient or apparent precip events advertised in the models for SNE, we do have to keep tabs on any convectively-augmented vorts/shortwaves rounding the top of the ridge, but too unpredictable at this range. Thus kept a mainly dry forecast, but will have to be cognizant of anything that can round/topple the ridge axis around Wed/Thurs. The main story in this period will be increasing warmth, especially for Wed and Thurs and possibly into Fri as well. There's strong multi-model consensus in 850 mb temps around the mid teens Celsius by Wed, which should bring highs in the interior into the low to mid 80s Wed and Thurs following the NBM, cooler 70s near the coasts. In most cases (Hartford did get to 80 degrees back on May 2nd), it should be the first appearance of 80 degree high temperatures that SNE has seen since the last such occurrence around late September/early October 2020. Don't really see any potential for backdoor cool fronts, so I see no compelling reason to deviate from these temps. While we will see building warmth, humidity levels are comfortable still with dewpoints in the 40s- lower 50s. All in all, a taste of early- summer warmth with lots of sun and generally dry weather. && .AVIATION /07Z SATURDAY THROUGH WEDNESDAY/... Forecaster Confidence Levels. Low - less than 30 percent. Moderate - 30 to 60 percent. High - greater than 60 percent. Today... VFR with light wind. Diurnal clouds will develop midday. Showers may form this afternoon at 10 thousand feet AGL, but the dryness of the air closer to the surface should evaporate most of the drops that fall. The light flow may allow sea breezes to form near the coast toward midday and in the afternoon. Tonight... VFR with patches of clouds at 10 thousand feet. Light wind. Sunday... VFR with light wind. Clouds will again form with scattered showers and widely scattered thunderstorms possible. KBOS TAF...High confidence in TAF. VFR. Moderate confidence on the timing of the coastal sea breeze. KBDL TAF...High confidence in TAF. VFR. Outlook /Sunday Night through Wednesday/... Sunday Night: VFR. Monday: VFR. Isolated SHRA, isolated TSRA. Monday Night: VFR. Tuesday through Wednesday: VFR. Breezy. && .MARINE... Short Term /through Sunday/... High pressure centered west of Srn New England will maintain light winds and seas through Sunday. Local sea breezes close to shore will redevelop today from midday through evening. A few light showers are possible today, but expect a mainly dry day. Scattered showers, widely scattered thunderstorms possible on Sunday. Outlook /Sunday Night through Wednesday/... Sunday Night through Monday Night: Winds less than 25 kt. Tuesday: Winds less than 25 kt. Seas locally approaching 5 ft. Tuesday Night through Wednesday: Winds less than 25 kt. Areas of seas approaching 5 ft. && .BOX WATCHES/WARNINGS/ADVISORIES... CT...None. MA...None. RI...None. MARINE...None. && $$ SYNOPSIS...WTB/Loconto NEAR TERM...WTB SHORT TERM...WTB LONG TERM...Loconto AVIATION...WTB/Loconto MARINE...WTB/Loconto
Zone forecast: https://api.weather.gov/zones/forecast/MAZ014/forecast
Hourly forecast: https://api.weather.gov/gridpoints/BOX/64,78/forecast/hourly
Hourly detail: https://api.weather.gov/gridpoints/BOX/64,78
Point detail: https://api.weather.gov/points/42.435,-71.2461