Lexington Weather

Lexington, Massachusetts, USA

51°F
3/28/2024 3:37pm 
  • Lexington Conditions: Light rain, Mist, Overcast
  • Temperature: 50.5°F / 10.3°CWarmer 0.3°F than last hour.
  • Dew Point: 49.5°FIncreased 0.4°Fsince last hour.
  • Relative Humidity: 96
  • Wind: Calm, 10-min avg: Calm, gust: None
  • Barometer: 29.81 inFalling 0.03  inHg/hr Falling Slowly
  • Visibility: 2½ miles
  • Rain Today: 0.94 in
  •   
Southeast Middlesex County, MA - Flood Watch
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National Short Range Forecast Discussion

Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
334 PM EDT Thu Mar 28 2024

Valid 00Z Fri Mar 29 2024 - 00Z Sun Mar 31 2024

...Unsettled weather for the West, with a late season Atmospheric River
impacting California into the weekend...

...Precipiation chances continue for New England Friday...

...Warming trend for portions of the central/eastern U.S. into the
weekend...

Higher elevation/mountain snow showers and lower elevation coastal/valley
rain will continue across the West Thursday evening and into the day
Friday as a frontal system moves through the region, eventually stalling,
and underneath energetic upper-level flow aloft. Precipitation amounts,
especially further inland, should remain mostly light to moderate except
in the vicinity of the boundary across the Great Basin and into the
central Rockies were some higher snow accumulations and more widespread
lower elevation showers are expected. Then, along the West Coast, an
amplifying upper-level trough/deepening closed low and the approach of a
stronger Pacific system will help usher in a late season influx of higher
moisture/Atmospheric River into central and southern California beginning
by late Friday. The best overlap of moisture and onshore/upslope flow will
initially be along the Transverse Ranges, where a Slight Risk of Excessive
Rainfall (level 2/4) is in place through Saturday morning. A few inches of
rainfall may lead to some flooding concerns, especially along terrain
sensitive areas. The threat will continue into the day Saturday, expanding
southward along the Peninsular Ranges, with another Slight Risk in effect
as additional rainfall, on top of increasingly saturated conditions, will
bring the threat for more instances of flooding. Some heavier rainfall is
expected over portions of central California, and spreading into the Lower
Colorado Basin by Saturday, but the flood threat looks to remain lower for
these regions for now. Some heavier snow is also forecast for higher
elevations of the Sierra Friday and into the weekend. 

In the East, showers along the Coast should begin to come to an end from
south to north in the Carolinas/Mid-Atlantic Thursday evening as a cold
front pushes away from the coast. Rain, heavy at times, will linger into
Friday for coastal New England as an area of low pressure intensifies
offshore and continues to advect additional moisture in. While the rain
will not be particularly intense, instances of flooding will remain a
concern with some higher water levels due to additional snowmelt/runoff
expected. The greatest risk will be through Friday morning, with a Slight
Risk in effect, though some threat may linger into Saturday for Downeast
Maine. Further inland, some snow will mix in, with some light
accumulations possible through northern Maine. Precipiation should taper
off through the day Saturday as the low pressure system moves away. An
upper-level shortwave and accompanying surface frontal system passing
through the Northern Plains will bring a wintry mix Friday, with some
increasing chances for accumulating snowfall along the Canadian border
from North Dakota into the Upper Midwest/Great Lakes. As the wave moves
further east, shower and thunderstorm chances will increase Saturday along
a quasi-stationary frontal boundary through portions of the Great
Lakes/Midwest. Increasingly moist southerly flow may bring some more
moderate to heavy showers as well as some thunderstorm chances by Saturday
evening.

An expanding area of warmer, above average temperatures is expected for
portions of the central U.S. Thursday, from the Southern Plains
northeastward into the Middle Mississippi/Lower Ohio Valley, as
upper-level heights rise across the region. Some chilly morning lows  into
the 30s are forecast for the Tennessee Valley into the Southern
Appalachians Thursday morning, with Frost Advisories in place for portions
of the region. However, temperatures will be warmer by Friday afternoon,
and the broader warm-up with above average temperatures will expand
eastward across the Southeast and into the Mid-Atlantic Saturday. Highs
will remain closer to average in the Northeast and below average and
chilly into the Northern Plains behind a cold front. Temperatures will
also be below average across much of the West, particularly for California
and into the Desert Southwest, as the upper-level troughing remains in
place and precipitation chances continue.

Putnam


Graphics available at
https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php