TTCM () > WeatherWednesday, October 27, 2021 — W1 W2 W3 W4 W5 53°F
Washington DC Climate ReportDeckSunrise: 7:29; Solar Noon: 12:52; Sunset: 6:15

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Last 72 Hours: ObservationsCurrently: 53°F  — USNO Clear Sky ChartHeavens-Above

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                VALUE   (LST)  VALUE       VALUE  FROM      YEAR
  MAXIMUM         66  12:25 PM  82    1920  66      0       62
  MINIMUM         58   3:59 PM  28    1879  48     10       48
  AVERAGE         62                        57      5       55

  TODAY            0.11          2.65 2007   0.11   0.00      T
  MONTH TO DATE    2.08                      3.08  -1.00     2.29
  SINCE SEP 1      6.11                      7.01  -0.90     7.82
  SINCE JAN 1     41.29                     34.92   6.37    43.67

Observations Archive

Forecast updates at 6 AM ET

Hazardous Weather Outlook
Wind Advisory

Today: A slight chance of showers before 8am, then a slight chance of showers after 2pm. Partly sunny, with a high near 65°. Breezy, with a northwest wind 5 to 15 mph increasing to 15 to 25 mph in the afternoon. Winds could gust as high as 38 mph. Chance of precipitation is 20%.

Tonight: A chance of showers, mainly between 8pm and 2am. Mostly cloudy, with a low around 50°. Breezy, with a northwest wind 16 to 25 mph, with gusts as high as 48 mph. Chance of precipitation is 40%.

Wednesday: Mostly cloudy, then gradually becoming sunny, with a high near 68°. Northwest wind 11 to 15 mph, with gusts as high as 25 mph.

Wednesday Night: Mostly clear, with a low around 48°. North wind 3 to 7 mph.

Thursday: Partly sunny, with a high near 65°. Light and variable wind becoming east 5 to 7 mph in the morning.

Thursday Night: Showers, mainly after 2am. Low around 54°. Chance of precipitation is 80%.

Friday: Showers. High near 64°. Chance of precipitation is 80%.

Friday Night: A chance of showers. Mostly cloudy, with a low around 52°. Chance of precipitation is 40%.

Saturday: A chance of showers. Partly sunny, with a high near 63°. Chance of precipitation is 50%.

Saturday Night: Mostly cloudy, with a low around 51°.

Sunday: Mostly sunny, with a high near 64°.

Sunday Night: Mostly clear, with a low around 47°.

Monday: Sunny, with a high near 64°.

Baltimore/Washington Forecast Office

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Discussion updates at 4 AM ET

Area Forecast Discussion
National Weather Service Baltimore MD/Washington DC
358 AM EDT Tue Oct 26 2021

A deepening surface low will linger off the northeast coast
today. High pressure will slowly build overhead Wednesday.
Another storm system will approach from the southwest Thursday
and overspread the region Thursday night into Friday. This
system will linger nearby into the weekend.

Most rainfall has pushed off to east at this point, with only
some lingering showers over the Potomac Highlands. Current
surface analysis depicts a surface low developing off the
Delmarva coast and another further southeast out over the
western Atlantic. In the upper levels, the region is beneath a
deep upper trough, with the primary upper low over the Great

The primary upper low is progged to push across the region
today. The upper low slowly pivots offshore throughout the day
into tonight. Meanwhile low pressure will be strengthening
offshore throughout the day today. High pressure starts to
build in from the west today as well. Between the two systems a
very tight pressure gradient across the region will lead to some
strong winds today. A Wind Advisory has been issued starting at
noon today going through midnight for areas along/west of the
Blue Ridge and along/north of the I-66 corridor. Left out far
northeast Maryland though, as some showers/cloud cover connected
to the developing low will be a limiting factor. Still will have
some gusty winds up there, just may not quite hit advisory
criteria. Highs today will be in the 60s, but with the wind and
showers, it will feel colder.

On Tuesday night, low pressure will deepen significantly as it
moves further up the northeast coast. Gusty winds will linger
into the overnight hours, but should fall below advisory
criteria after midnight as the low pulls away. Lows will be
cooler across the region reaching the 40s to low 50s.

One note on temperatures over the mountains though, where temps
along/west of the Allegheny Front may get near freezing at the
highest ridges. Some upslope showers are expected in NW flow
overnight, which could mix in with a few snow flakes on highest
ridge tops. Wouldn`t be any significant accumulations, but
could see a few flakes though.

For Wednesday, rain should be ending across the region, with
surface high pressure moving in along with upper-level ridging.
Mostly sunny skies are expected Wednesday as well with high
temperatures in the 60s (40s to 50s in the higher elevations).

Lighter winds and mostly clear skies will prevail Wednesday
night, with lows mostly in the 40s.

Much of Thursday will be dry as well, with surface high
pressure and upper-level ridging remaining in place. Temps
slightly cooler though for much of the area, but only be a few
degrees. The main concern will be to our west as a cutoff upper
low is developing across the center of the country. The
attendant surface low will be moving from the central MS river
valley generally towards the Ohio Valley by Thursday evening.

The warm front associated with the aforementioned surface low
will push through the region Thursday night into Friday
morning. Moderate to heavy rainfall is expected with this
system, owing to strong onshore flow. More information on
rainfall totals with this system are detailed in the long-term
discussion below.

Very impressive deep cyclone over the OH Valley on Fri will track
slowly to the ENE lifting into New England by Sunday. There is
remarkable very good agreement amongst the global models showing a
sub 1000 mb low crossing the area Fri afternoon with the upper level
trof axis crossing the area Sat afternoon. A tight pressure gradient
develops ahead of the main low Fri morning sustaining an Atlc
moisture feed into the area late Thu night through the day Fri.
Widespread one to two inches of rain seem possible with this system
with the bulk of the rain focused on the Blue Ridge Mtns and areas
to the west. Long term areal flooding will be possible for those
areas as lack of instability will limit rainfall intensity and
likely prevent any flash flooding. Unsettled wx will continue
through Saturday before ridging builds early next week and
seasonable early Nov weather returns.

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