TTCM () > WeatherMonday, June 5, 2023 — W1 W2 W3 W4 88% 76°F
Washington DC Climate ReportDeckSunrise: 5:44 (W1: 7%); Solar Noon: 1:07 (W3: 53%); Sunset: 8:30 (W5: 100%) @SunDC

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Last 72 Hours: ObservationsCurrently: 76°F  — USNO Clear Sky ChartHeavens-Above

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                VALUE   (LST)  VALUE       VALUE  FROM      YEAR
  MAXIMUM         76   3:56 PM  99    1925  82     -6       86
  MINIMUM         61   7:41 AM  46    1907  64     -3       61
  AVERAGE         69                        73     -4       74

  TODAY            0.00          1.49 2008   0.13  -0.13     0.00
  MONTH TO DATE    0.00                      0.51  -0.51     0.46
  SINCE JUN 1      0.00                      0.51  -0.51     0.46
  SINCE JAN 1     10.22                     16.64  -6.42    19.42

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Hazardous Weather Outlook
Coastal Flood Advisory

Today: Mostly sunny, with a high near 81°. North wind 5 to 8 mph.

Tonight: Mostly clear, with a low around 58°. Northwest wind 5 to 7 mph becoming west after midnight.

Tuesday: A slight chance of showers after 3pm. Sunny, with a high near 86°. West wind 7 to 14 mph, with gusts as high as 20 mph. Chance of precipitation is 20%.

Tuesday Night: A slight chance of showers before 9pm. Partly cloudy, with a low around 58°. Northwest wind 7 to 10 mph. Chance of precipitation is 20%.

Wednesday: Mostly sunny, with a high near 81°. Northwest wind 5 to 9 mph.

Wednesday Night: Partly cloudy, with a low around 57°.

Thursday: Sunny, with a high near 81°.

Thursday Night: Partly cloudy, with a low around 57°.

Friday: Mostly sunny, with a high near 79°.

Friday Night: Partly cloudy, with a low around 58°.

Saturday: Sunny, with a high near 85°.

Saturday Night: Partly cloudy, with a low around 63°.

Sunday: Mostly sunny, with a high near 90°.

Baltimore/Washington Forecast Office

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

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Area Forecast Discussion
National Weather Service Baltimore MD/Washington DC
928 PM EDT Sun Jun 4 2023

High pressure will build in from the Great Lakes and New England
while low pressure meanders off Cape Cod through Monday night. A
cold front will likely drop southward Tuesday. High pressure will
gradually build in through the end of the week as another low
spirals off the New England Coast.

Low clouds have finally retreated south of I-64/US-250, but it`s
possible they remain banked against the Appalachians for much of
the night in this area. A boundary is pushing in from the north,
marking a wind shift to the north and dew points in the lower-
mid 30s versus mid 40s to mid 50s to the south. This boundary
will slowly push south through the area overnight but may
stall/wash out before reaching the southwestern quadrant of the
CWA. In this area, where dew points will remain higher, some
fog may develop overnight.

Low temperatures will likely drop well into the 40s for
rural/sheltered valley locations as winds go light to calm and
skies clear (promoting radiational cooling). Closer to the
Chesapeake Bay as well as in the downtown DC/Baltimore areas,
lows will likely hover in the mid to upper 50s.

A sharp shortwave trough is indicated across the 12Z guidance
suite, progged to cross the region late Monday afternoon and
evening. Much of the atmosphere will be quite dry, so some
cumulus clouds and waves of mid/upper clouds are unlikely to
bear any rain.

Another upper-level low will take shape over the Northeast U.S.
(diving out of the Polar regions of Canada), sending a shortwave
and corresponding height falls and unusually cool mid-level
temperatures into the Mid-Atlantic Tuesday afternoon and
evening. Moisture will be a little better, but still meager;
temperatures in the 80s and dew points a few degrees on either
side of 50 will likely yield only modest CAPE values of
~200-700 J/kg. However, very steep low-level lapse rates and
deep mixing layer heights with winds of 30-40 kts in the cloud-
bearing layer may result in some gusty showers or a few
thunderstorms as the wave crosses.

The extended forecast looks to be mostly dry, with limited
opportunities for much needed rain. The large upper low meandering
east of the Maine coast retrogrades westward late in the week as it
merges with another upper trough moving south from northern Canada.
As the merged upper trough swings southwestward, it drags a
backdoor cold front across the area early Wednesday. While upper
forcing is plentiful, moisture looks very limited, so only have
a 20pct chance for rain Wednesday and Thursday afternoons.

Numerous shortwaves traverse the area Friday into next weekend. This
looks to be the next best chance for more widespread precip, however
model confidence is low and moisture still remains low through
Saturday. The lack of rain is likely to worsen the ongoing drought,
though thankfully the presence of broad troughing (and CAA) over the
Northeast/Mid-Atlantic will keep temperatures at or below normal for
early to mid June. Highs are forecast in the upper 70s to low 80s,
climbing up to the mid 80s on Saturday. Overnight lows in the upper
40s to low 50s west of the Blue Ridge, and mid to upper 50s east
are expected.

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