TTCM () > WeatherWednesday, December 6, 2023W1 W2 87% W4 W5 45°F
Washington, D.C., WeatherSunrise: 7:12 (W1: 90%); Solar Noon: 11:59 (W3: 49%); Sunset: 4:46 (W5: 8%)

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Last 72 Hours: ObservationsCurrently: 45°F  — USNO Clear Sky ChartHeavens-Above

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                VALUE   (LST)  VALUE       VALUE  FROM      YEAR
  MAXIMUM         51  12:47 PM  75    2001  52     -1       51
  MINIMUM         39   1:32 AM  14    1886  37      2       31
  AVERAGE         45                        44      1       41

  YESTERDAY        0.00          1.72 1993   0.12  -0.12     0.00
  MONTH TO DATE    0.98                      0.57   0.41     0.31
  SINCE DEC 1      0.98                      0.57   0.41     0.31
  SINCE JAN 1     30.23                     38.98  -8.75    39.96

T: Month, Season, Year
P: Month, Season, Year
NWS Radar (National Mosaic, Loop)
NWS Hourly Forecast Graph; Table
NWS Forecast (Print, Text); Discussion
NWS Hazardous Weather Outlook

Today: Scattered sprinkles. Partly sunny, with a high near 45°. Northwest wind 9 to 11 mph, with gusts as high as 21 mph.

Tonight: Mostly clear, with a low around 30°. Northwest wind 5 to 10 mph becoming light west after midnight.

Thursday: Cloudy, then gradually becoming mostly sunny, with a high near 47°. Southwest wind 5 to 9 mph.

Thursday Night: Mostly clear, with a low around 33°. Light and variable wind.

Friday: Mostly sunny, with a high near 57°. Calm wind becoming south around 6 mph in the morning.

Friday Night: Mostly clear, with a low around 37°.

Saturday: Mostly sunny, with a high near 57°.

Saturday Night: A chance of rain after 1am. Mostly cloudy, with a low around 45°. Chance of precipitation is 30%.

Sunday: Rain likely before noon, then showers, mainly after noon. High near 64°. Breezy. Chance of precipitation is 90%.

Sunday Night: Showers likely, mainly before 1am. Mostly cloudy, with a low around 38°. Breezy. Chance of precipitation is 70%.

Monday: Mostly sunny, with a high near 48°.

Monday Night: Mostly clear, with a low around 31°.

Tuesday: Sunny, with a high near 49°.

Latest Forecast

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

ISS SightingsSpace Dashboard

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

Weather Prediction CenterStorm Prediction CenterClimate Prediction Center

Continental U.S. (CONUS) Surface Analysis

Area Forecast Discussion
National Weather Service Baltimore MD/Washington DC
1000 AM EST Wed Dec 6 2023

High pressure will build over the region through Friday, then
move offshore this weekend. A strong frontal system will likely
impact the region on Sunday. High pressure will return Monday.

The main trough axis was pivoting offshore as of 10am, with
just enough moisture for spotty sprinkles in its wake (except
flurries for the higher elevations (and NE MD) east of the
Allegheny Front. Upslope snow continues along/west of the
Allegheny Front, but continues to generally gradually taper off.

As the system moves offshore this afternoon, winds will
increase out of the W/NW. A few gusts to 30 mph are possible,
primarily in the mountains. Cloud cover will provide poor
mixing this afternoon, so don`t anticipate those gusts to get to
the lower elevations. Could see gusts around 15 to 20 mph
though, which will still make it feel quite brisk with highs in
the 40s today.

Winds will become lighter tonight especially over sheltered
valleys east of the Appalachians. With a mainly clear sky east
of the mountains this evening, radiational cooling should allow
temperatures to drop well into the 20s. Elsewhere, 30s are
expected with high clouds increasing toward dawn. Along and west
of the Allegheny Front, lingering flurries or a few snow showers
are possible, especially this evening.

The shortwave that is accompanying the aforementioned surface
low will slide by to our north on Thursday. While the low
levels look a mostly dry, there could be just enough lift for
some sprinkles or flurries in northeast MD if there is a little
bit of lingering moisture. Otherwise, dry and slightly
milder/less breezy conditions are expected through Thursday

High pressure moves offshore and turns flow southerly on
Friday, which will act to moderate temperatures considerably.
Highs will be back into the mid to upper 50s, with some spots in
the Shenandoah Valley even breaking into the 60s.

On Saturday, upper level ridging will be moving off the East
Coast as a trough digs into the Plains. Surface high pressure
to our south continues advancing offshore with southerly flow
behind it advecting moisture and above normal temperatures into
the region. Dry conditions are expected most of Saturday with
rain chances moving into our western periphery Saturday night as
surface low pressure moves into the Ohio Valley.

Guidance remains in decent agreement synoptically with the next
significant weather maker on Sunday, amplifying the upper trough as
it moves into the Midwest with the base of the trough digging down
into the Mississippi Valley. There are some notable timing
differences, with the GFS jogging slightly ahead of the ECMWF and
Canadian. The suite of guidance seems to have trended slightly
slower overall though, the jet moving overhead later in the
afternoon/early evening. Ensemble members continue to introduce some
modest CAPE around this time, though the more favorable shear might
be later in the evening/overnight. Probs for 24hr 1" rainfall have
continued to increase as well.

This far out, there is significant uncertainty, but we will continue
to monitor for the potential severe/heavy rain threat. Strong winds
may also accompany this system. Timing will be key in whether these
threats materialize. For now, our area can at least anticipate a
soaking rain.

After the system exits, high pressure is expected to build in behind
it Monday into Tuesday, with some possible upslope precipitation
along the Alleghenies.

Temperatures are forecast to be well above normal over the weekend,
approaching over 15 degrees above average by Sunday. As the cold
front associated with the system moves through, temperatures drop
sharply behind it Monday and Tuesday.

Latest Discussion

Climate — Genesis 8:22
While the earth remains, seedtime and harvest, cold and heat, winter and summer, and day and night shall not cease.

Sea Level — Job 38:8-11
Who shut in the sea with doors, when it burst forth and issued from the womb; when I made the clouds its garment, and thick darkness its swaddling band; when I fixed My limit for it, and set bars and doors; when I said, ‘This far you may come, but no farther, and here your proud waves must stop!’

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