Lexington, Massachusetts, USA
25.2°F
-3.8°C
Cold
Clear
Tonight: Lo 20 °F
Thursday: Hi 33 °F
Dew Point: 18.7°F
Humidity:
76%
UV Index: 0.0 None
Barometer:
mb
Rain Rate: 0.00 in/hr
Rain Today: 0.00 in
Rain Wednesday: 0.00 in
Visibility: 10 miles
Wind:
Now: Calm
Avg: Calm
Gusts: 0 mph
Issued by:
National Weather Service Boston / Norton, MA
Point Forecast Updated Wed Dec 6, 2023 10:16pm EST
High pressure maintains dry weather late this week into early this weekend with temperatures rising to above normal levels. A strong frontal system has the potential to bring a period of steady rain, gusty southerly winds and potential for coastal flooding along the southern coastlines later Sunday night and into early on Monday. Turning drier by Monday afternoon with a brief shot of colder air for Monday night, but temperatures look to rebound back closer to seasonable levels by next Tuesday and Wednesday.
Mostly Clear
Lo 20 °F
Mostly clear, with a low around 20. Northwest wind around 7 mph.
Mostly Sunny
Hi 33 °F
Mostly sunny, with a high near 33. Northwest wind around 7 mph.
Mostly Clear
Lo 23 °F
Mostly clear, with a low around 23. West wind around 5 mph.
Sunny
Hi 42 °F
Sunny, with a high near 42. Southwest wind around 3 mph.
Partly Cloudy
Lo 29 °F
Partly cloudy, with a low around 29. South wind around 5 mph.
Partly Sunny
Hi 48 °F
Partly sunny, with a high near 48. South wind around 7 mph.
Mostly Cloudy
Lo 38 °F
Mostly cloudy, with a low around 38. Southeast wind around 7 mph.
Mostly Cloudy then Chance Light Rain
Hi 57 °F
A chance of rain after 1pm. Mostly cloudy, with a high near 57. South wind 6 to 20 mph, with gusts as high as 31 mph. Chance of precipitation is 30%.
Light Rain
Lo 49 °F
Rain. Cloudy, with a low around 49. South wind 22 to 25 mph, with gusts as high as 44 mph. Chance of precipitation is 100%.
Light Rain
Hi 51 °F
Rain before 5pm. Partly sunny, with a high near 51. Southwest wind 15 to 25 mph, with gusts as high as 38 mph. Chance of precipitation is 80%.
Mostly Clear
Lo 30 °F
Mostly clear, with a low around 30. West wind 9 to 15 mph.
Sunny
Hi 44 °F
Sunny, with a high near 44. Southwest wind around 10 mph.
Partly Cloudy
Lo 32 °F
Partly cloudy, with a low around 32. Southwest wind around 12 mph.
Mostly Sunny
Hi 45 °F
Mostly sunny, with a high near 45. West wind around 10 mph.
Issued by:
National Weather Service Boston / Norton, MA
Updated Wed Dec 6, 2023 10:16pm EST
000 FXUS61 KBOX 070329 AFDBOX Area Forecast Discussion National Weather Service Boston/Norton MA 1029 PM EST Wed Dec 6 2023 .SYNOPSIS... High pressure maintains dry weather late this week into early this weekend with temperatures rising to above normal levels. A strong frontal system has the potential to bring a period of steady rain, gusty southerly winds and potential for coastal flooding along the southern coastlines later Sunday night and into early on Monday. Turning drier by Monday afternoon with a brief shot of colder air for Monday night, but temperatures look to rebound back closer to seasonable levels by next Tuesday and Wednesday. && .NEAR TERM /UNTIL 6 AM THURSDAY MORNING/... Continuing to monitor extent of clouds anchored around the Berkshires. There was a decreasing trend for these clouds, but it was very slow. Also watching ocean effect clouds impacting parts of the South Shore, Cape and islands. These clouds should linger a while longer, really as long as winds stay out of the N. Expecting winds to become more NW after midnight, so eventually even these clouds should dissipate to a larger extent. Minor tweaks to temperatures this evening. Started out by matching observed trends. The forecast then gets complicated with the lingering clouds and light winds. Still thinking we will not maximize the radiational cooling potential, despite the mainly clear skies for some. 630 PM Update: While there are still a couple general areas of enhanced cloudiness - one in the lower CT Valley and the clouds other across Cape Cod - the trends in many areas per satellite and RH cross sections is for decreasing cloudiness. Subfreezing temps are common across SNE early this evening, and while we expect some radiational cooling, it's not completely maximized as there looks to be enough of a NW wind around for the balance of the evening. In addition, while most areas should trend clear, ocean effect stratocumulus clouds ongoing across Cape Cod as mentioned above look to linger for most of if not all of the overnight. Thus lows in the upper 20s/low 30s there but otherwise, most everywhere should see lows down in the low to mid 20s. Previous discussion: Light snow has all but ended for eastern MA and only lingering as a few hit and miss showers in western MA/CT this afternoon. As the mid level trough axis moves offshore this evening cold, dry NW winds continue to bring in a much below average airmass. Surface temperatures are expected to dip as low as the upper teens in the highest elevations, closer to the lower 20s elsewhere across SNE. && .SHORT TERM /6 AM THURSDAY MORNING THROUGH THURSDAY NIGHT/... Thursday mid level ridging to our west will direct continued cool NW flow into the region keeping temperatures on the cold side of normal. Highs won't top out higher than mid 30s Thursday afternoon with a mix of sun and clouds. While there's not much moisture to work with, a subtle shortwave and a layer of moisture at 700 mb will bring increasing mid level clouds during the day. By evening heights will be on the rise with the approaching ridge and moisture exits leaving a clear sky. Given that and calm winds with a surface high overhead, it should be a good radiational cooling night, taking lows into the lower 20s and even upper teens in the typically coldest spots. && .LONG TERM /FRIDAY THROUGH WEDNESDAY/... Highlights: * Dry weather Fri thru Sat with warming temperatures to above normal levels. * Strong frontal system around later Sun night/Mon could bring gusty winds, period of steady rain/possible downpours, and possible coastal flooding along the south facing coasts. Still some uncertainty on the timing. Stay tuned! Well above normal temps Sun and possibly into Mon. * Brief shot of colder air Mon night but gradual rebound to temperatures on Tue. Details: Friday through Saturday Night: Gradual warming trend remains indicated in this period as high pressure is anchored to our south allowing for warm advection and 500 mb heights rise. Skies both Fri and Sat should feature mostly sunny to partly cloudy conditions with more clouds the further west one goes. Despite some clouds around, dry weather is still anticipated with modest SW breezes. Temps rise to around or just above seasonable levels on Fri with values in the mid/upper 40s for highs, and should reach well into the 40s to the lower 50s for Sat. Sunday into Monday: This period is the most active in the long-term portion of the forecast - and while there are still some smaller timing differences that will still need to be nailed down, most of the deterministic and ensemble model depictions seem to be keying on later Sunday night and into the first part of Mon as being the most active. We are expecting a strong frontal system coming out of the OH Valley and Appalachians to move through the Northeast in that timeframe. This anticipated storm system still has the potential to bring several weather-related concerns to Southern New England, including a period of steady rains/perhaps a rumble or two of thunder, breezy to gusty southerly winds, hazardous marine conditions and a potential for minor coastal flooding and possible beach erosion for south- facing coastlines. While it is not well agreed upon across the model suite, there are some solutions which show the initiating 500 mb trough taking on a negative tilt around Sunday night and early on Mon as the system's surface cold front works its way through. Did note in response to this added potential for stronger synoptic- scale vertical motion, QPF amts in the GFS and ECMWF deterministic models were quite a bit higher. Deep layer moisture content also becomes elevated with PWAT standardized While there wasn't much in the way of convective instability, the meager amt there is could be augmented by the enhanced dynamic ascent to support a few rumbles of thunder along the frontal zone for the Sunday overnight period. Significant flooding problems are not expected but nuisance hydro issues could result from any clogged storm drains in the face of steady rains/local downpours. Frontal boundary looks to clear into the offshore waters by mid to late morning on Mon, but that too is subject to further fine tuning regarding timing. Southerly winds stand to be on the increase during the day on Sun, but the greatest potential for period of enhanced southerly gusts is later Sunday night and into early Mon just ahead of the frontal boundary. Models still depict a robust 925-850 mb southerly low level jet of 75 to 85 kt Sunday night along the southern and eastern coastlines. How much mixing we see is still unclear but potential exists for wind-related headlines on the southern and perhaps eastern coastal areas if we can realize enough mixing. Stronger southerly gusts over the water may support potential gale or perhaps storm force conditions over the waters for Sunday evening into Mon. Finally the strong southerly flow may lead to elevated storm surge for south coastal MA/RI and could bring the risk for coastal flooding concerns and/or beach erosion for those southern coastal RI/MA locations. While minor coastal flooding tends to occur more often, if peak surge values can coincide with high tide (slated for 620 AM Mon AM at Providence) some coastal flooding could develop. Little if any notable coastal flooding concerns are likely on the eastern coast given southerly flow component. Above normal temps are favored for this period, especially with the nighttime lows Sunday night. Highs Sunday should be well above mid- December climo in the mid 50s to low 60s (climo is upper 30s to mid 40s), with lows in the 40s to low 50s. Highs on Monday are more susceptible to frontal timing although above normal temps are still favored until frontal passage, and then temps then steadily fall upon frontal passage. Monday Night and Tuesday: Rapid clearing takes place Mon night with strong cold advection setting shape for a chilly night, though not likely to be as cold as it could be given enough of a NW breeze. Dry conditions remain favored with lows in the 20s. Dry weather continues into Tue with high pressure to our south. In addition, it looks as though colder air that moves in on Monday evening is brief with temps recovering around seasonable levels in the upper 30s to low 40s. && .AVIATION /03Z THURSDAY THROUGH MONDAY/... Forecast Confidence Levels: Low - less than 30 percent. Moderate - 30 to 60 percent. High - greater than 60 percent. Tonight: High confidence. VFR for most, although BKN/OVC VFR bases at times at HYA/ACK. N winds around 5-10 kt, with occasional gusts 18-22 kt over the Cape and Islands. Thursday and Thursday night...High Confidence. VFR. NNW winds becoming W 5-10 kts. Turning NW 5-10 kts on Thursday night. KBOS Terminal...High confidence in TAF. VFR. NNW winds trend NW overnight, remaining that way until becoming a WNW around 6-8 kt around ~15-17z Thu. KBDL Terminal...High confidence in TAF. VFR. Light NW winds will trend W by Thu ~14-16z with increasing midlevel clouds. Outlook /Friday through Monday/... Friday through Saturday Night: VFR. Sunday: Mainly VFR, with local IFR possible. Windy with gusts up to 35 kt. Chance RA. && .MARINE... Forecaster Confidence Levels: Low - less than 30 percent. Medium - 30 to 60 percent. High - greater than 60 percent. High Confidence. Expecting winds and seas to diminish for Thursday as high pressure moves overhead through Thursday night. Outlook /Friday through Monday/... Friday through Saturday Night: Winds less than 25 kt. Sunday: Low risk for gale force winds with gusts up to 35 kt. Seas locally approaching 5 ft. Chance of rain. && .BOX WATCHES/WARNINGS/ADVISORIES... CT...None. MA...None. RI...None. MARINE...Small Craft Advisory until 11 PM EST this evening for ANZ231>235-256. Small Craft Advisory until 10 AM EST Thursday for ANZ254. Small Craft Advisory until 7 AM EST Thursday for ANZ255. && $$ SYNOPSIS...Belk/Loconto NEAR TERM...Belk SHORT TERM...Belk LONG TERM...Loconto AVIATION...Belk/Loconto MARINE...Belk/Loconto
Radar images courtesy Weather Underground / Intellicast.
UV Index forecast high for today: 1 Low
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:
0.00 in
Wednesday:
1.07 in
December:
55.18 in
2023
12:00am
25.2°F
High today:
12:00am
25.2°F
Low today:
2:22pm
35.8°F
High Wednesday:
11:50pm
25.2°F
Low Wednesday:
12:00am
25.2°F
Low wind chill today:
11:50pm
25.2°F
Low wind chill Wednesday:
12:02am
18.7°F
High dew pt today:
11:05am
29.1°F
High dew pt Wednesday:
None
Wind gust today:
None
Wind gust Wednesday:
No alerts/warnings active for Southeast Middlesex County.
Alerts active nearby in: Coastal Waters extending out to 25 nm South of Marthas Vineyard and Nantucket; Coastal waters from Provincetown MA to Chatham MA to Nantucket MA out 20 nm
No snow expected in Lexington.
First Light:
6:29am
Sunrise:
7:01am
Sunset:
4:12pm
Twilight ends:
4:44pm
Daylight length:
09 hours 12 minutes
Phase:
Waning Crescent (32%)
Moon rise:
1:14am
Moon set:
1:12pm