Old Res Weather

Lexington, Massachusetts, USA

12/4/2020 12:32am 
  • Lexington Conditions: Clear
  • Temperature: 39.0°F / 3.9°CColder 1.3°F than last hour.
  • Dew Point: 28.9°FIncreased 0.7°Fsince last hour.
  • Relative Humidity: 67%Increased 5.0% since last hour.
  • Wind: Calm, 10-min avg: Calm, gust: 1 mph
  • Barometer: 30.12 inRising 0.02  inHg/hr Rising Slowly
  • Visibility: 10 miles
  • Rain Today: 0.00 in
  • UV Index: $VPuv None

National Short Range Forecast Discussion

Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
237 PM EST Thu Dec 03 2020

Valid 00Z Fri Dec 04 2020 - 00Z Sun Dec 06 2020

...A rapidly-intensifying Nor'easter will bring gusty winds and heavy rain
from the Mid-Atlantic to New England this weekend; heavy snow will be
possible across interior portions of the Northeast...

...Extremely Critical Fire Weather along the Coastal Ranges of southern

The most impactful weather system across the Continental United States
through this weekend will be a powerful early-season Nor'easter. An area
of low pressure currently located along the central Gulf Coast is forecast
to move toward the northeast and near the southern Appalachians by late
Friday. Showers and isolated thunderstorms will be associated with this
system across the Southeast and Mid-Atlantic as it makes a beeline toward
the Mid-Atlantic coastline. Once the low moves off the New Jersey coast
Saturday morning, it is expected to enter a very favorable upper-level
environment and rapidly strengthen. By late Saturday this dynamic system
is forecast churn in the Gulf of Maine, bringing gusty winds to much of
New England. Hazardous weather associated with this storm also includes
heavy rain across the Mid-Atlantic and coastal sections of the Northeast.
Upwards of 1 to 2 inches of rain, with locally higher amounts, could lead
to isolated flooding concerns due to these regions still drying out from
heavy rain that just fell a few days ago.

On the northwest side of the storm, confidence is increasing that heavy
snow will impact interior portions of the Northeast, as well as much of
Maine. Snowfall amounts of 6 to 12 inches will be possible from western
Massachusetts towards northern and central Maine. Upwards of two feet of
snow could fall across the highest peaks of the Green and White mountain
ranges. As per usual with a Nor'easter, there will be a sharp gradient
between areas that see heavy snowfall and areas that see rain closer to
the coast. Where snow does fall, it could be heavy enough to cause
isolated tree damage and consequently power outages.

Elsewhere, weather throughout the western United States will remain fairly
quiet with one exception. Thanks to a large area of high pressure located
over the Rockies and Great Basin, gusty offshore winds are expected to
continue across southern California through at least Friday. These winds
combined with dry air will allow for any wildfires to spread
uncontrollably. The Storm Prediction Center has placed Extremely Critical
Fire Weather areas across the San Diego County Mountains, as well as the
mountains of eastern Ventura and western Los Angeles counties this
evening. Red Flag Warnings and High Winds Warnings have also been issued
for much of southern California.


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