TTCM () > WeatherSaturday, December 4, 2021 — 70% W2 W3 W4 W5 43°F
Washington DC Climate ReportDeckSunrise: 7:11; Solar Noon: 11:58; Sunset: 4:46

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Last 72 Hours: ObservationsCurrently: 43°F  — USNO Clear Sky ChartHeavens-Above

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DCwx
...THE WASHINGTON NATIONAL DC CLIMATE SUMMARY FOR DECEMBER 3 2021...

WEATHER ITEM   OBSERVED TIME   RECORD YEAR NORMAL DEPARTURE LAST
                VALUE   (LST)  VALUE       VALUE  FROM      YEAR
                                                  NORMAL
TEMPERATURE (F)
 YESTERDAY
  MAXIMUM         62   1:13 AM  71    2012  52     10       54
  MINIMUM         43  11:59 PM  15    1976  37      6       31
  AVERAGE         53                        45      8       43

PRECIPITATION (IN)
  YESTERDAY        0.00          1.83 1901   0.12  -0.12     0.00
  MONTH TO DATE    T                         0.34  -0.34     0.02
  SINCE DEC 1      T                         0.34  -0.34     0.02
  SINCE JAN 1     43.46                     38.75   4.71    52.40

Observations Archive

Today: Partly sunny, with a high near 57°. Northeast wind 5 to 8 mph becoming northwest in the afternoon.

Tonight: Mostly cloudy, then gradually becoming mostly clear, with a low around 34°. North wind around 6 mph.

Sunday: Mostly sunny, with a high near 50°. North wind 6 to 9 mph becoming southeast in the afternoon. Winds could gust as high as 18 mph.

Sunday Night: A chance of rain, mainly after 11pm. Mostly cloudy, with a low around 41°. East wind 5 to 7 mph becoming south after midnight. Chance of precipitation is 40%.

Monday: A chance of rain before 11am, then a chance of rain after 2pm. Partly sunny, with a high near 65°. South wind 8 to 17 mph, with gusts as high as 33 mph. Chance of precipitation is 30%.

Monday Night: A chance of rain, mainly before 11pm. Mostly cloudy, with a low around 31°. Chance of precipitation is 40%.

Tuesday: Mostly sunny, with a high near 44°.

Tuesday Night: A chance of rain after 8pm, mixing with snow after 9pm. Mostly cloudy, with a low around 32°. Chance of precipitation is 50%.

Wednesday: Rain and snow likely, becoming all rain after 10am. Mostly cloudy, with a high near 44°. Chance of precipitation is 70%.

Wednesday Night: Rain likely before 2am, then a chance of rain and snow. Mostly cloudy, with a low around 32°. Chance of precipitation is 70%.

Thursday: A chance of snow. Partly sunny, with a high near 46°. Chance of precipitation is 30%.

Thursday Night: Mostly cloudy, with a low around 36°.

Friday: Partly sunny, with a high near 52°.

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Area Forecast Discussion
National Weather Service Baltimore MD/Washington DC
853 PM EST Fri Dec 3 2021

.SYNOPSIS...
High pressure will build across the region through tonight.
A cold front will cross the region late Saturday. High pressure
will return briefly Sunday, followed by a stronger cold front
on Monday. After another brief return of high pressure, a
larger storm system may affect the region later next week.


.NEAR TERM /THROUGH SATURDAY/...
A nearly stationary boundary remains over the Carolinas this
evening while weak high pressure remains to the north. A band
of mid and high level clouds persists over the northern and
central portions of the CWA beneath the southern edge of a
potent upper- level jet. These clouds will likely persist across
the area most of the night, and they may even build south and
west a bit in response to a backing low-level wind (to the
southwest) due to weak low pressure well to our south and west
in the southern stream. These clouds may cut back on radiational
cooling to some degree, with lows in the 30s for most areas
(lower 40s in downtown Washington and Baltimore).

On Saturday, high pressure will move offshore. The boundary
currently over North Carolina will return northward as a weak
warm front as low pressure lifts from the mid section of the
country into Canada. A cold front will follow, moving across the
region during the afternoon. This front will bring a
reinforcing shot of cooler air, but warmer air will push north
just ahead of it. This will result in another relatively mild
day with some sun. In fact, temps likely rise back up a few
degrees compared to today.


.SHORT TERM /SATURDAY NIGHT THROUGH SUNDAY NIGHT/...
The cold front is expected to move offshore Saturday evening
bringing a reinforcing shot of cold air and knocking temps back
closer to normal for Saturday night into Sunday. However, by
this point, the stronger system over the eastern Pacific
presently will be quickly crossing the country. Northerly
breezes behind the cold front Saturday night will shift
southeasterly by Sunday night. An increase in clouds will
follow. Showers may approach the Appalachians late Sunday night
as yet another cold front approaches from the west, and also
southern Maryland and east of I-95 toward dawn as a disturbance
develops just off the coast.

Otherwise, the southeasterly flow Sunday night will keep temps
milder than Saturday night, with most areas likely staying in
the upper 30s to lower 40s.


.LONG TERM /MONDAY THROUGH FRIDAY/...
The work week begins with an increasingly meridional pattern as
a deep upper-level trough approaches. A warm front will lead
this feature, advecting warmer air and moisture into the area
ahead of an anticipated cold frontal passage on Monday. With
more available moisture than recent fronts, this system may
produce more precip for the area than the comparatively drier
systems we`ve had recently.

Cold air behind the front increases chances for wintry precip in our
northwestern counties through early Tuesday morning, particularly
upslope snow along and west of the Allegheny Front. High pressure
will build following the exit of this system, though it will
likely be short-lived as the next system sets up for Wednesday.

Guidance suggests a wetter system with the potential for a mix
or snow, mostly for areas well west of I-95, but confidence is
still low. Recent deterministic model runs are trending toward
slightly warmer solutions overall, but there is still spread
from model-to-model. Another southern stream system may
approach on Thursday, but variance among models regarding track
and timing is high.

High temperatures in the 50s and 60s Monday will drop sharply
to the 30s to mid 40s on Tuesday. From here, temperatures look
to gradually warm through the week, but forecast temperatures
are highly uncertain, depending heavily on the evolution of the
aforementioned system(s).


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