TTCM () > WeatherFriday, July 30, 2021 — 48% W2 W3 W4 W5 78°F
Washington DC Climate ReportDeckSunrise: 6:08; Solar Noon: 1:14; Sunset: 8:21

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Last 72 Hours: ObservationsCurrently: 78°F  — USNO Clear Sky ChartHeavens-Above

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                VALUE   (LST)  VALUE       VALUE  FROM      YEAR
  MAXIMUM         87   3:03 PM 104    2011  89     -2       93
  MINIMUM         73   3:15 AM  58    1920  73      0       75
  AVERAGE         80                        81     -1       84

  TODAY            T             2.34 1877   0.13  -0.13     0.00
  MONTH TO DATE    4.05                      4.07  -0.02     6.29
  SINCE JUN 1      9.56                      8.27   1.29     9.80
  SINCE JAN 1     25.92                     24.40   1.52    26.90

Observations Archive

Today: Isolated showers before 9am. Mostly cloudy, then gradually becoming sunny, with a high near 88°. Northwest wind 5 to 13 mph. Chance of precipitation is 20%.

Tonight: Mostly clear, with a low around 64°. North wind 7 to 11 mph.

Saturday: Mostly sunny, with a high near 83°. Light and variable wind becoming north around 6 mph in the morning.

Saturday Night: A chance of showers after 3am. Partly cloudy, with a low around 67°. South wind 3 to 6 mph. Chance of precipitation is 30%.

Sunday: Showers likely, mainly between 9am and 3pm. Partly sunny, with a high near 82°. South wind 5 to 9 mph. Chance of precipitation is 60%.

Sunday Night: A chance of showers before 9pm. Partly cloudy, with a low around 66°. Chance of precipitation is 40%.

Monday: Sunny, with a high near 85°.

Monday Night: Partly cloudy, with a low around 66°.

Tuesday: Scattered showers, mainly after 9am. Mostly sunny, with a high near 83°. Chance of precipitation is 40%.

Tuesday Night: Scattered showers, mainly before 3am. Partly cloudy, with a low around 66°. Chance of precipitation is 40%.

Wednesday: Scattered showers. Mostly sunny, with a high near 85°. Chance of precipitation is 30%.

Wednesday Night: Scattered showers. Partly cloudy, with a low around 67°. Chance of precipitation is 30%.

Thursday: A chance of showers and thunderstorms. Mostly sunny, with a high near 85°. Chance of precipitation is 30%.

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Area Forecast Discussion
National Weather Service Baltimore MD/Washington DC
342 AM EDT Fri Jul 30 2021


A cold front will move through the area later today. High
pressure will build over the area tonight. A weak area of low
pressure will pass south of the area Sunday night. Additional
systems may impact the region next week as troughing becomes
established over the eastern half of the country.


Isolated showers will remain possible through late morning
mainly over the Appalachian region and perhaps across far
southern areas while a cold front passes through the local area.
Drying is expected this afternoon into tonight in the wake of
the frontal passage under NW winds. High pressure settles over
the area tonight. High temperatures will be around 90 or low


Dry conditions will persist through the day Saturday under weak
high pressure. Widespread clouds and showers are expected to
develop Saturday night and Sunday north of a sfc front across
North Carolina and along the base of longwave trough over the
eastern US. Scattered to locally nmrs showers are expected with
a 700 mb wave well depicted in model guidance late Saturday
night into Sunday morning before this wave moves offshore Sun
evening. Rainfall amounts of a quarter to half inch are expected
east of the Blue Ridge Mountains.


The H5 ridge in the western US and trough in the east will continue
through most of the long term. Behind the frontal passage, high
pressure will build Monday keeping conditions dry.

Tuesday through the rest of the long term becomes unsettled with
numerous opportunities for precipitation. The aforementioned front
will stall over the Carolinas as the upper level flow becomes nearly
parallel to the front. Low pressure may form along this boundary and
track northeast, bringing showers and thunderstorms to the southeast
portions of the FA Tuesday into Tuesday night. The strength of the
upper-level trough will influence the northern extent of the
precipitation associated with the low pressure Tuesday.

Some guidance forms a closed upper-level low in the trough by
midweek. Regardless, the base of the trough/low looks to be situated
over the Ohio Valley. This allows a moisture plume of Gulf origin to
be advected into the region by Wednesday and continue Thursday. The
same front looks to move back north/northeast Wednesday into
Thursday as several areas of low pressure track along the front
which could produce locally heavy rainfall. Cannot rule out isolated
hydro issues, especially in the urban and hydrophobic areas.

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