Lexington, Massachusetts, USA
67.3°F
19.6°C
Muggy
Overcast
Overnight: Lo 65 °F
Wednesday: Hi 77 °F
Dew Point:
63.0°F
Humidity: 86%
UV Index: 0.0 None
Barometer:
mb
Rain Rate: 0.00 in/hr
Rain Today: 0.00 in
Rain Tuesday: 0.20 in
Visibility: 10 miles
Wind:
Now: Calm
Avg: Calm
Gusts: 1 mph
Issued by:
National Weather Service Boston / Norton, MA
Point Forecast Updated Wed Aug 10, 2022 3:26am EDT
A backdoor cold front brings much cooler temperatures today but humidity remains elevated. A wave of low pressure may bring some showers to mainly Rhode Island and southeast Massachusetts tonight into Thursday if it tracks close enough to the coast. Prolonged stretch of dry and tranquil weather Friday through Sunday with cooler than normal temperatures and low humidity levels. Weather pattern turns more unsettled early to mid next week with better chances for rains around Tuesday or Wednesday. Temperatures remain at seasonable levels with no indications of significant heat and humidity returning to Southern New England in the foreseeable future.
Cloudy
Lo 65 °F
Cloudy, with a low around 65. Northeast wind around 6 mph.
Mostly Cloudy
Hi 77 °F
Mostly cloudy, with a high near 77. Northeast wind 3 to 7 mph.
Chance Rain Showers
Lo 61 °F
A chance of rain showers after 8pm. Mostly cloudy, with a low around 61. South wind 2 to 7 mph. Chance of precipitation is 30%.
Slight Chance Rain Showers
Hi 81 °F
A slight chance of rain showers before 2pm. Partly sunny, with a high near 81. South wind 2 to 7 mph. Chance of precipitation is 20%.
Slight Chance Rain Showers then Partly Cloudy
Lo 65 °F
A slight chance of rain showers before 9pm. Partly cloudy, with a low around 65. West wind 2 to 7 mph. Chance of precipitation is 20%.
Mostly Sunny
Hi 80 °F
Mostly sunny, with a high near 80. Northeast wind around 8 mph.
Partly Cloudy
Lo 61 °F
Partly cloudy, with a low around 61. North wind around 6 mph.
Mostly Sunny
Hi 79 °F
Mostly sunny, with a high near 79. Northeast wind around 7 mph.
Partly Cloudy
Lo 60 °F
Partly cloudy, with a low around 60. Southwest wind around 5 mph.
Mostly Sunny
Hi 82 °F
Mostly sunny, with a high near 82. Southwest wind 2 to 6 mph.
Partly Cloudy
Lo 64 °F
Partly cloudy, with a low around 64. South wind 2 to 6 mph.
Slight Chance Rain Showers
Hi 82 °F
A slight chance of rain showers after 11am. Mostly sunny, with a high near 82. South wind 2 to 7 mph.
Slight Chance Rain Showers
Lo 64 °F
A slight chance of rain showers. Partly cloudy, with a low around 64. Southeast wind 2 to 6 mph.
Chance Rain Showers
Hi 79 °F
A chance of rain showers before 1pm, then a chance of showers and thunderstorms. Partly sunny, with a high near 79. East wind 3 to 9 mph. Chance of precipitation is 30%.
Issued by:
National Weather Service Boston / Norton, MA
Updated Wed Aug 10, 2022 3:26am EDT
000 FXUS61 KBOX 100740 AFDBOX Area Forecast Discussion National Weather Service Boston/Norton MA 340 AM EDT Wed Aug 10 2022 .SYNOPSIS... A backdoor cold front brings much cooler temperatures today but humidity remains elevated. A wave of low pressure may bring some showers to mainly Rhode Island and southeast Massachusetts tonight into Thursday if it tracks close enough to the coast. Prolonged stretch of dry and tranquil weather Friday through Sunday with cooler than normal temperatures and low humidity levels. Weather pattern turns more unsettled early to mid next week with better chances for rains around Tuesday or Wednesday. Temperatures remain at seasonable levels with no indications of significant heat and humidity returning to Southern New England in the foreseeable future. && .NEAR TERM /UNTIL 6 PM THIS EVENING/... 345 AM Update... * Much cooler today with mostly dry weather and a mix of sun/clouds. The back door cold front pushes just south of New England then stalls, with weak low pressure traveling along it. Radar reflectivity shows a few isolated showers across northern CT and just off Nantucket. These are forming right along the frontal boundary that is expected to stall just south of the MA/RI south coast. SPC mesoanalysis shows 25 kt 0-6km shear across the south coast and some MLCAPE just offshore. So there is a low probability of a few thundery showers or an isolated thunderstorm, with better chances offshore through the early morning hours. In addition, due to the weak nature of the cold front and the fact that we are coming off PWAT values that are near/at max of SPC sounding climo (2-2.3 inches), there is plenty of moisture trapped under the low-level inversion. So did include slight chance PoPs (mostly in the form of drizzle away from the immediate coast) all the way up to the Mass Pike, with chance PoPs along the south coast along with mention of isolated thunder. Not expecting anything strong or severe but don't be surprised to wake up to a rumble of thunder if you live along or near the south coast. Then for the remainder of the day, we will have a much cooler northeast wind flow, and with SSTs northeast of our area only in the mid to upper 60s, highs will only in the mid 70s to mid 80s, bringing an end to the heat wave. Mid 70s should be found along the eastern MA coast, with upper 70s to low 80s across much of interior MA, northeast CT and RI. Best shot for mid 80s will be across CT valley due to downsloping warming effect on temperatures on a northeast flow. It should be a mostly dry day with rather comfortable dew points as well as a mix of sun and clouds. Expect more clouds than sun earlier in the day trending more sun than clouds later in the day. Talk about a nice finish to the work day. Enjoy! && .SHORT TERM /6 PM THIS EVENING THROUGH 6 PM THURSDAY/... * A period of showers on Thursday with best chance for appreciable, steady rainfall south of the Mass Pike, and especially along the MA/RI south coast into Cape and the Islands. A wave of low pressure approaches our area from the Mid Atlantic states. Looks like best chance for appreciable rainfall will be south of the Mass Pike, and especially near and along the MA/RI south coast into Cape and the Islands. Timing wise, the leading edge of the precipitation will be entering Connecticut during the overnight hours, spreading into eastern MA around or right after daybreak. Forecast sounding cross sections show deeper RH values only up to 6-7k ft, so not expecting too much in the way of rainfall, i.e. mainly in the form of a few sprinkles or showers. PWATs over 1.5 inches (seasonably high, although not record territory like the past couple of days) will overspread areas south of the Pike and into eastern MA by daybreak. Then during the day, a swath of 0.75 to 1 inch PWATs (roughly 25th percentile according to SPC sounding climatology for Chatham, MA) overspreads from west to east, which should help suppress the best shot for appreciable rainfall to areas near and along the south coast into Cape and Islands. A disclaimer here is that given limited baroclinicity this time of year, it is somewhat challenging to pinpoint the northward extent of a synoptic QPF field. Nonetheless, 00z CAMs are coming into better consensus with the track of the low pressure giving areas north of the Mass Pike mostly dry weather. Otherwise, the only thing will have to watch is for perhaps some scattered showers and isolated thunderstorms trying to enter western MA during the evening hours with the cold front approaching. More details in the long term discussion section. Dynamics weaken as this moves east so may fall part as it tries to enter southern New England. Highs on Thu will mainly be in the 80s, but perhaps places on the immediate coast may not reach 80. && .LONG TERM /THURSDAY NIGHT THROUGH TUESDAY/... Highlights: * Dry, tranquil weather with pleasant humidity levels and temps a few degrees below normal Fri thru Sun. * Turning unsettled Mon thru Wed, with increasing chances for showers toward Tue-Wed. Temps seasonable but may see a modest increase in humidity level by midweek but nothing like what was experienced recently. Details: Through this portion of the forecast, the governing large-scale pattern transitions to one of mid-level troughing, as the Intermountain West ridge amplifies and retrogrades towards the NW. Longwave troughing digs into western New England Thurs night. It then more-or-less settles into New England and the mid-Atlantic states through at least midweek, reinforced by additional trough energy around early to midweek. This 500 mb configuration, reflected in most deterministic models and the ensemble means, should make our weather pattern more unsettled as we move into next week. That said, lower-than-normal heights and cooler lower-level temps translate to no significant heat or humidity surges with temps trending around or just below normal. Though there may be some spotty rain chances near coastal New England on Fri, much of Fri into the upcoming weekend will feature dry and tranquil weather with comfortable humidity levels. Dewpoints could be as low as the upper 40s in the interior by this weekend! So, a much more refreshing air mass with fairly strong diurnal ranges. Highs generally in the 70s to lower 80s with lows in the mid 50s to low 60s should be common through much of this period. Thus should be ideal for outdoor activities, though temps will run a few degrees below normal. By Mon through Wed, shortwave energy emanating from the Gt Lakes helps reinforce the longwave trough. A bit more southwest flow looks to bring deeper moisture into our area, making our weather pattern more unsettled with better opportunities for increased rain chances. Timing and location of PoPs and QPF are still uncertain though; assessment of ensembles don't really shed much light on the unclear pattern either. Looks like Tues and Wed may offer better chances regionally, but some opportunity for rain showers could develop as early as Monday. Will carry NBM-based Chance-level PoP in this period, higher toward Tues-Wed. Significant rains don't look likely at this point though. Temps run closer to seasonable levels but may also see an uptick in humidity level moving into midweek; at the moment, nothing like the sauna-like humidity levels we saw on several occasions recently. && .AVIATION /08Z WEDNESDAY THROUGH SUNDAY/... Forecaster Confidence Levels: Low - less than 30 percent. Medium - 30 to 60 percent. High - greater than 60 percent. 07Z TAF Update... Rest of tonight...High confidence in trends, moderate in exact timing. A backdoor cold front has brought IFR/LIFR ceilings to much of Cape and eastern MA/RI terminals during the overnight hours behind the cold front near the southeast New England coast. Elsewhere across interior MA/CT, low VFR to MVFR ceilings. Winds shift to the NNE at 5 to 10 knots behind the cold front, but will briefly gust stronger along the immediate coast right behind the front. Today...Moderate confidence. MVFR/IFR ceilings slowly improving to VFR. E/NE winds turning to the SE at 5-10 kts. Tonight...Moderate confidence. MVFR to IFR conditions with perhaps some rain showers spreading in toward the south coast. Lots of uncertainty with this activity as a low develops along the frontal boundary nearby. Light SE/S winds perhaps shifting to the SW toward daybreak. Thursday...Moderate confidence. Mainly VFR, with areas MVFR possible during periods of rain. Best chance for showers south of the Mass Pike. KBOS...Moderate confidence. KBDL...Moderate confidence. Outlook /Thursday Night through Sunday/... VFR. && .MARINE... Forecaster Confidence Levels: Low - less than 30 percent. Medium - 30 to 60 percent. High - greater than 60 percent. 340 AM Update... Today...High confidence. NE/E winds at 5-10 kts with seas 2-4 ft. Wednesday night...Moderate confidence. Light E/SE winds around 5 kts. Seas 2-4 ft, but some uncertainty with regards to the northward extent of the rainfall associated with a low pressure system passing to our south. Best chance for showers developing late overnight across southern waters, with eastern waters likely remaining dry. Thursday...Moderate confidence. Winds and seas below SCA criteria. Chance of rain showers especially across the southern waters. Outlook /Thursday Night through Sunday/... Thursday Night: Winds less than 25 kt. Slight chance of rain showers. Friday through Sunday: Winds less than 25 kt. && .BOX WATCHES/WARNINGS/ADVISORIES... CT...None. MA...None. RI...None. MARINE...None. && $$ SYNOPSIS...Loconto/Chai NEAR TERM...Chai SHORT TERM...Chai LONG TERM...Loconto AVIATION...Loconto/Chai MARINE...Loconto/Chai
Radar images courtesy Weather Underground / Intellicast.
UV Index forecast high for today: 6 High
Current (Measured): 0.0 None
Note: Rain measured automatically by weather station. Rain totals do not necessarily include melted frozen precipitation.
For more accurate, manually measured rain data, see the Local Precip Data page.
0.00 in
Rain Rate (/hr):
0.00 in
Rain Last 60 min:
0.00 in
Rain Today:
0.20 in
Tuesday:
0.83 in
August:
19.51 in
2022
12:00am
68.2°F
High today:
4:40am
67.3°F
Low today:
1:45pm
99.3°F
High Tuesday:
11:56pm
68.2°F
Low Tuesday:
12:00am
65.1°F
High dew pt today:
4:33pm
79.3°F
High dew pt Tuesday:
1:45pm
115.9°F
High heat index Tuesday:
1:16am
5 mph
Wind gust today:
8:37pm
11 mph
Wind gust Tuesday:
No alerts/warnings active for Southeast Middlesex County.
First Light:
5:16am
Sunrise:
5:47am
Sunset:
7:54pm
Twilight ends:
8:24pm
Daylight length:
14 hours 07 minutes
Phase:
Waxing Gibbous (96%)
Moon set:
3:25am
Moon rise:
7:31pm