Lexington, Massachusetts, USA
Point Forecast Updated Fri Mar 29, 2024 6:59am EDT
An enjoyable Friday, but active period of weather arrives late tonight through Saturday night with heavy rain, flooding, wintry weather, and marine hazards. Drying out Sunday into early next week but rather windy along the coast, especially Cape and Islands. Below normal temperatures will prevail. The next chance of rain will be Wednesday and Thursday as another frontal system approaches.
Chance Light Rain
Hi 51 °F
A chance of rain before 1pm. Mostly cloudy, with a high near 51. Northwest wind 9 to 15 mph, with gusts as high as 28 mph. Chance of precipitation is 50%. New rainfall amounts between a tenth and quarter of an inch possible.
Partly Cloudy
Lo 35 °F
Partly cloudy, with a low around 35. Northwest wind around 15 mph, with gusts as high as 25 mph.
Sunny
Hi 54 °F
Sunny, with a high near 54. West wind 10 to 15 mph.
Mostly Cloudy then Slight Chance Light Rain
Lo 38 °F
A slight chance of rain after 4am. Mostly cloudy, with a low around 38. West wind 5 to 9 mph. Chance of precipitation is 20%.
Partly Sunny
Hi 53 °F
Partly sunny, with a high near 53. Northwest wind 5 to 14 mph.
Partly Cloudy
Lo 34 °F
Partly cloudy, with a low around 34. Northwest wind 6 to 14 mph.
Partly Sunny
Hi 53 °F
Partly sunny, with a high near 53. Northeast wind 6 to 9 mph.
Mostly Cloudy then Chance Light Rain
Lo 37 °F
A chance of rain after midnight. Mostly cloudy, with a low around 37. Southeast wind around 9 mph. Chance of precipitation is 30%.
Light Rain Likely
Hi 44 °F
Rain likely. Mostly cloudy, with a high near 44. East wind 8 to 14 mph. Chance of precipitation is 70%.
Light Rain Likely
Lo 36 °F
Rain likely. Cloudy, with a low around 36. Northeast wind around 15 mph. Chance of precipitation is 70%.
Light Rain Likely
Hi 43 °F
Rain likely. Mostly cloudy, with a high near 43. Northeast wind 14 to 17 mph. Chance of precipitation is 70%.
Light Rain Likely
Lo 36 °F
Rain likely. Mostly cloudy, with a low around 36. North wind around 18 mph. Chance of precipitation is 70%.
Chance Light Rain
Hi 45 °F
A chance of rain. Mostly cloudy, with a high near 45. Northwest wind 20 to 23 mph, with gusts as high as 36 mph. Chance of precipitation is 40%.
Slight Chance Light Rain then Mostly Cloudy
Lo 35 °F
A slight chance of rain before 11pm. Mostly cloudy, with a low around 35. Northwest wind 17 to 23 mph, with gusts as high as 35 mph.
Updated Fri Mar 29, 2024 6:59am EDT
000 FXUS61 KBOX 221744 AFDBOX Area Forecast Discussion National Weather Service Boston/Norton MA 144 PM EDT Fri Mar 22 2024 .SYNOPSIS... An enjoyable Friday, but active period of weather arrives late tonight through Saturday night with heavy rain, flooding, wintry weather, and marine hazards. Drying out Sunday into early next week but rather windy along the coast, especially Cape and Islands. Below normal temperatures will prevail. The next chance of rain will be Wednesday and Thursday as another frontal system approaches. && .NEAR TERM /UNTIL 6 PM THIS EVENING/... 10 AM Update Near term forecast is on track at this hour and no changes to the forecast are need. Not a cloud in the sky to start the day beneath a bone dry atmosphere. Some surface obs are reporting negative dewpoint temperatures. Sunny/dry conditions persist into the afternoon, but some increasing cloudiness during the mid afternoon hours. Previous Discussion * Sunny to start, though clouds increase throughout the afternoon. * High temperatures range between the upper 30s and low 40s. A quiet day ahead, though it will be a transitional period ahead of an rather active overnight through Saturday, more on that part of the forecast in the next section. For today, dry and mainly sunny due to high pressure over the northeast. Winds ease, becoming west at 10 to 15 mph. Clouds increase this afternoon ahead of our next weather system. Afternoon highs are in the upper 30s across the higher terrain to the low 40s for the coastal plain. && .SHORT TERM /6 PM THIS EVENING THROUGH SATURDAY NIGHT/... * Heavy rain late tonight through Saturday night could lead to river flooding as well as poor drainage and urban flooding. * Minor snow accumulations north of RT 2 through the state line, but freezing rain is the greater concerns for western and central Massachusetts late tonight through Saturday morning. * Period of gusty winds late Saturday night into Sunday morning for Rhode Island and southeast Massachusetts. Our next system will bring multiple hazards to southern New England starting tonight and ending early Sunday morning. Hazards include widespread heavy rain, which may lead to poor drainage and urban flooding, in addition to river flooding. Plus, at the onset, late tonight, there should be enough cold air to produce freezing rain and snow for higher terrain of northern and western Massachusetts. Rain: What has changed since our last forecast? A Flood Watch was issued starting Saturday morning through Sunday morning for Rhode Island, Connecticut, eastern Massachusetts, plus southern Worcester County and Hampden County. PWATs surge well over an inch areas south of the Mass Pike, which is 250 to 300 percent of normal for late March. In fact, PWATs could reach as high as 1.3 inch along the southern coast. Rain does arrive predawn Saturday, though becomes widespread mid to late morning, with the heaviest axis arriving early Saturday afternoon through the overnight. Either way you look at it, the day is a washout. Ensembles have greater than 50 percent chance of 3 inches or more of rain to fall somewhere from Connecticut into Rhode Island, though there is a 75 percent chance of 2.5 inches or more over the same area. Currently our forecast is calling for widespread 2.0 to 3.0 inches with localized higher amounts possible. Rain does quickly end on Sunday morning, perhaps ending around sunrise on Sunday. Areas that typically experience nuisance flooding will want to take note and prepare accordingly. In addition, river flooding is more than likely with 80 percent chance of minor flooding on the Pawtuxet River at Cranston, and event 40 percent chance of moderate flooding at the same location. Another area to watch, the Wood River at Hope Valley has a 85 percent chance of minor flood and 50 percent chance of moderate flood. Less than ideal for those who have dealt with these repeat rain events all winter long. Winter Weather: Believe it or not, some will have minor snow accumulations, around an inch or two north of RT 2, though will be short-lived as the snow will wash away fairly quickly. Though to the south, thermal profiles have a warm nose between 950mb and 850mb, with surface temperatures remain below freezing, around 32F to 30F. This likely will lead to freezing rain and ice accumulation, starting around midnight and ending mid Saturday morning. With ice accumulation of a few hundredths of an inch to a tenth, likely leading to hazardous travel we have hoisted a Winter Weather Advisory in collaboration with WFO ALY for all of western and central Massachusetts for late tonight through late Saturday morning. Wind: While not a primary hazard, gusty southeast wind are likely Saturday afternoon into Sunday morning. 925mb LLJ passes over this area with winds aloft between 60 and 70 knots, good news, there is a strong low level thermal inversion, but we do think about half of that may mix down to the surface. Wind gusts of 30 to 40 mph are possible, just shy of wind advisory criteria. But, if guidance were to show a weaker inversion or stronger winds aloft, these gusts may need to be increased and an advisory could be considered. Temperatures: Keep it short and sweet. Tonight lows are in the upper 20s across the interior and mid 30s for the coastal plain. High temperature on Saturday are split, northern Massachusetts the high is in the upper 30s to 40 degrees, while the coastal plain climbs into the upper 40s and low 50s. Saturday night into Sunday morning temperatures fall to the teens and low 20s across the interior and low 30s for the coastal plain. && .LONG TERM /SUNDAY THROUGH THURSDAY/... Highlights: * Mostly dry Sun into Tue, but blustery with below normal temps. Quite windy over the Cape/Islands * Increasing risk of wet weather Wed into Thu Sunday through Tuesday... Bulk of rainfall with the frontal wave will be pushing offshore by daybreak Sunday as drier moves in from the west. Will lead to a dry day Sunday for much of SNE, but lingering moisture plume is just offshore and if timing is just a bit slower, rain could linger across SE New Eng into Sunday morning. Otherwise, ocean storm well to the south with strong high pres to the north will result in strong NE flow, especially along the coast. Persistent 40-50 kt 925 mb winds across SE New Eng and soundings show a shallow but fairly well mixed boundary layer to support 40-50 mph wind gusts for the outer Cape and Islands for Sunday into Monday. Even stronger winds to 55 mph possible at Nantucket. Wind advisories will likely be needed. The winds should slowly slacken a bit Monday night into Tue as the low level jet weakens a bit but it will still be windy. Deterministic global guidance favors mostly dry weather through Tue but ensemble QPF probs show potential for some showers to rotate into the SE New Eng. We have a dry forecast for now but more uncertainty for SE New Eng where we could see a few showers at times into Tuesday. At the very least there will be more clouds across SE New Eng. Wednesday and Thursday... Pattern turns more unsettled as shortwave energy approaches from the west within SW flow aloft, with potential for an amplifying trough along the east coast. Lots of uncertainty with how northern and southern stream energy interact, but potential exists for a coastal low developing to the south toward the end of the period. && .AVIATION /18Z FRIDAY THROUGH TUESDAY/... Forecast Confidence Levels: Low - less than 30 percent. Moderate - 30 to 60 percent. High- greater than 60 percent. 18Z update... Through 00Z... High Confidence VFR. Increasing mid-high clouds from 080-120. Steady 5 to 10 know westerly winds weakening and becoming light southwest by 00Z. Tonight...High confidence in trends. Moderate in timing. VFR through about 06Z with light southwesterly winds becoming more south/southeasterly. Conditions begin to deteriorate after 06Z as precip associated with a surface warm front lifting over southern New England begins to support MVFR ceilings and light precip. Frozen precip will be an issue at the western terminals (BDL/BAF/ORH). A brief period of -SN followed by -FZRA will be possible beginning as early as 08Z. Elsewhere, any precip will be limited to -RA, but likely will be closer to or after 12Z before precip reaches the eastern terminals. Tomorrow...High confidence in trends. Moderate in timing. -FZRA pay persist at BDL/BAF/ORH through as late as 14Z, but will changeover to rain thereafter with surface temps rising above freezing after sunrise. MVFR cigs/vsbys deteriorate to IFR by 18Z as rain overspreads the region. Rain picks up in intensity after 18Z and remains steady through 00Z. Southeast winds gradually increase throughout the day ranging from 10 knots across the interior to 15 to 20 knots over the coastal plain. Tomorrow Night... High trends. Moderate in timing. IFR/MVFR cigs improve to VFR returns as precip gradually ends from west to east from 00 to 06Z. Rain lingers a bit longer over The Cape/Island terminals likely tapering off between 06 and 09Z with VFR returning to this area between 09 and 12Z. Winds strengthen after 00Z behind a surface cold front. 15 to 25 knot sustained northwest winds with gusts up to 35 knots. Outlook /Sunday through Tuesday/... Sunday: VFR. Strong winds with local gusts up to 40 kt. Sunday Night through Monday: VFR. Strong winds with gusts up to 45 kt. Monday Night: Mainly VFR, with local MVFR possible. Strong winds with local gusts up to 40 kt. Tuesday: Mainly VFR, with local MVFR possible. Windy with gusts up to 35 kt. && .MARINE... Forecaster Confidence Levels: Low - less than 30 percent. Medium - 30 to 60 percent. High - greater than 60 percent. Today through Saturday Night: High pressure builds over the coastal waters today and allows winds and seas to continue to diminish and subside to more calm levels. Relatively quiet marine conditions continue overnight, but winds begin to strengthen out of the south/southeast a few hours before sunrise on Saturday as a robust low-pressure system approaches the northeast. Increasing winds will also be accompanied by gradually rising seas. Have issued a Gale Watch for Saturday afternoon, though early Saturday winds will be reaching Small Craft Advisory Criteria. Likely gale force wind Saturday afternoon out of the southeast then becoming north/northeast Saturday night into Sunday. Outlook /Sunday through Tuesday/... Sunday: Moderate risk for gale force winds with gusts up to 40 kt. Rough seas up to 14 ft. Sunday Night through Monday: Moderate risk for gale force winds with gusts up to 45 kt. Rough seas up to 14 ft. Slight chance of rain. Monday Night: Moderate risk for gale force winds with gusts up to 40 kt. Rough seas up to 14 ft. Tuesday: Low risk for gale force winds with gusts up to 35 kt. Rough seas up to 13 ft. Slight chance of rain. && .BOX WATCHES/WARNINGS/ADVISORIES... CT...Winter Weather Advisory from 2 AM to noon EDT Saturday for CTZ002. Flood Watch from Saturday morning through Sunday morning for CTZ002>004. MA...Winter Weather Advisory from 2 AM to noon EDT Saturday for MAZ002>004-008>011-026. Flood Watch from Saturday morning through Sunday morning for MAZ005>007-009-011>024. RI...Flood Watch from Saturday morning through Sunday morning for RIZ001>008. MARINE...Gale Watch from Saturday afternoon through late Saturday night for ANZ230>237-250-251-254>256. Small Craft Advisory until 2 PM EDT this afternoon for ANZ250- 254-255. && $$ SYNOPSIS...KJC/Dooley NEAR TERM...RM SHORT TERM...Dooley LONG TERM...KJC AVIATION...Belk/RM MARINE...KJC/Dooley
Point forecast:
https://api.weather.gov/gridpoints/BOX/65,93/forecast
Zone forecast:
https://api.weather.gov/zones/forecast/MAZ014/forecast
Hourly forecast:
https://api.weather.gov/gridpoints/BOX/65,93/forecast/hourly
Hourly detail:
https://api.weather.gov/gridpoints/BOX/65,93
Point detail:
https://api.weather.gov/points/42.4399,-71.2405
Alerts:
https://api.weather.gov/alerts?active=1&point=42.4399,-71.2405