TTCM () > WeatherMonday, January 30, 2023 — 78% W2 W3 W4 W5 41°F
Washington DC Climate ReportDeckSunrise: 7:16 (W1: 92%); Solar Noon: 12:21 (W3: 61%); Sunset: 5:27 (W5: 31%)

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Last 72 Hours: ObservationsCurrently: 41°F  — USNO Clear Sky ChartHeavens-Above

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                VALUE   (LST)  VALUE       VALUE  FROM      YEAR
  MAXIMUM         50  11:52 AM  76    1975  45      5       33
  MINIMUM         40   2:11 AM   2    1873  30     10       22
  AVERAGE         45                        37      8       28

  YESTERDAY        0.03          1.02 1912   0.09  -0.06      T
  MONTH TO DATE    1.48                      2.68  -1.20     3.68
  SINCE DEC 1      5.34                      6.09  -0.75     4.31
  SINCE JAN 1      1.48                      2.68  -1.20     3.68

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Today: Patchy fog before 9am. Otherwise, cloudy through mid morning, then gradual clearing, with a high near 58°. Calm wind becoming south around 6 mph in the afternoon.

Tonight: Increasing clouds, with a low around 36°. South wind 5 to 8 mph becoming north after midnight.

Tuesday: A chance of rain before 10am, then a chance of rain and snow. Cloudy, with a high near 40°. North wind 5 to 9 mph, with gusts as high as 21 mph. Chance of precipitation is 30%.

Tuesday Night: A chance of rain and snow before 1am, then a chance of snow. Cloudy, with a low around 30°. Calm wind becoming north 5 to 8 mph after midnight. Chance of precipitation is 40%.

Wednesday: Partly sunny, with a high near 39°. Northwest wind 6 to 9 mph.

Wednesday Night: Mostly cloudy, with a low around 27°.

Thursday: Cloudy, with a high near 44°.

Thursday Night: Mostly cloudy, with a low around 29°.

Friday: Mostly sunny, with a high near 36°. Breezy.

Friday Night: Mostly clear, with a low around 15°.

Saturday: Sunny, with a high near 29°.

Saturday Night: Mostly cloudy, with a low around 22°.

Sunday: Cloudy, with a high near 43°.

Latest Forecast | Forecast Archive

Time and Date: Today, Sun-Moon, Climate-ForecastGaisma

ISS SightingsSpace Dashboard

Launch Calendars: NASA, KSC, 2019, SFN, SFI, RLL, SpaceX

Area Forecast Discussion
National Weather Service Baltimore MD/Washington DC
334 AM EST Mon Jan 30 2023

A wave of low pressure will track along a boundary to our
northwest today before that boundary passes through as a cold
front tonight into Tuesday. A couple waves of low pressure will
track along the boundary as is stalls to the south Tuesday
through Tuesday night. High pressure will briefly return
Wednesday, but additional waves of low pressure will pass by to
the south Thursday. An Arctic cold front will pass through
Thursday night and Arctic high pressure will build toward the
area Friday and Saturday. The high will quickly move offshore
early next week.

Saturated soils from light rain yesterday along with light winds
suggest that there may be areas of fog early this morning.
Plenty of clouds should prevent widespread dense fog from
developing, but locally dense fog is possible.

For the rest of today, an anomalous subtropical ridge remains
over the southeastern CONUS while the polar jet tracks across
the northern CONUS. There is a nearly stationary boundary
embedded in the southwest flow aloft that is positioned to our
northwest. Therefore, a southerly flow will allow for a warm
afternoon with highs well into the 50s, and even 60s if there
are enough breaks of sunshine.

A few showers are possible across southern MD early this
morning as an upper-level disturbance embedded within the
southwest flow aloft passes by just to our south and east.
Elsewhere, mainly dry conditions are expected.

A wave of low pressure will track along the boundary to our
northwest this afternoon before moving off to the northeast
tonight. As this moves off to the northeast, that boundary will
drop southeast as a cold front. A few showers are possible,
especially over the Allegheny Highlands this afternoon, but
most other locations should remain dry.

The cold front will gradually pass through the area tonight,
likely reaching central Virginia by daybreak Tuesday. A few
showers may accompany the frontal passage, especially across
northern MD where forcing may be a bit stronger with the frontal
passage. Even there, any precipitation will be light.

For locations along and west of the Allegheny Front, an upslope
component to the low-level flow causes a likelihood for light
precipitation. Cold air will also be filtering in at this time,
which means that any light rain will likely change to light
snow. There may be a period where fzra/sleet is possible as
well, but confidence was too low for an advisory at this time.
Either way, it looks like there will be some accumulating snow
with wet surfaces preceding this and temperatures falling below
freezing. Therefore, slippery spots are likely overnight and
toward Tuesday morning.

The boundary will continue to drop to the south Tuesday through
southern Virginia into North Carolina. High pressure will
approach from the north, and a northerly flow will usher in
noticeably chillier conditions during this time. At the same
time, a weak wave of low pressure will develop along the
boundary in response to an upper-level disturbance passing
through in the zonal flow aloft. Light rain, perhaps mixed with
some light snow is most likely near and south of Interstate 66
and US 50, closer to the boundary and upper-level disturbance.
Farther north, some light rain/snow is possible, but confidence
is lower since it will be farther away from the dynamics and
further into the low-level dry air. As for impactful wintry
precipitation, the best chance for that will be in the mountains
where surface temperatures will be near or below freezing.
Across the rest of the area, it is most likely that temperatures
will be above freezing, so even if there is some light snow,
the most likely scenario is that it has no impact.

Another wave of low pressure and upper-level disturbance will
pass by to the south Tuesday night. Model guidance still
diverges on how strong this system will be, and consequently how
much precipitation will develop in the colder air. It will be
colder Tuesday night of course, so if precipitation develops
there can be some light snow accumulation across much of the
area. This will continue to be monitored. Will continue with the
forecast that suggests a coating of snow can accumulate, but
kept pops at chance levels for now given the uncertainty as to
whether or not it will precipitate.

High pressure will build overhead for Wednesday into Wednesday
night, bringing dry conditions for most areas along with
seasonable conditions. However, the zonal flow aloft will
continue and weak disturbances will pass by to our south. Some
light precipitation may still clip our far southern areas in
central Virginia, but confidence is low.

A potent trough with 2-4 sigma height anomalies will move across
Manitoba into Quebec and eventually New England Thursday into
Friday. At the surface, this will result in blustery northwest flow
and much below normal conditions as the area of high pressure
centers of Pennsylvania. This high placement will keep conditions
dry for Friday and Saturday, aside from the Alleghenies which may
see a few snow showers, though accumulations are currently expected
to be light given shallow moisture on model soundings. The big story
will be temperatures. With 850 mb temps of -15 to -18 C across the
region, lows Thursday night will be in the mid 20s for most, teens
in the mtns. Highs Friday will be teens in the mtns, with a gradual
increase to near or just above freezing near the metros/bay. Friday
night looks the coldest, with lows in the single digits in the mtns
and teens elsewhere. Given the winds of 15-25 mph, wind chills will
be below zero in the mtns and across the Mason-Dixon.

Come Saturday, the trough/vortex will move into Maritime Canada with
height rises locally. As an incoming trough moves through the Ohio
Valley, the interaction of the northern and southern stream energy
will be key to see if there is any precipitation/storm threat Sunday
into Monday. Have maintained low end chance POPs for most with some
wintry potential.

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