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Friday,
September 25, 2020
Washington DC Climate Report
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DCwx
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Weather
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Sunrise: 6:59;
Solar Noon: 12:59;
Sunset: 7:00
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Last 72 Hours: Observations
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Currently: 66°F
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Heavens-Above
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...THE WASHINGTON NATIONAL DC CLIMATE SUMMARY FOR SEPTEMBER 24 2020...
WEATHER ITEM OBSERVED TIME RECORD YEAR NORMAL DEPARTURE LAST
VALUE (LST) VALUE VALUE FROM YEAR
NORMAL
TEMPERATURE (F)
TODAY
MAXIMUM 74 12:07 PM 99 2010 76 -2 83
MINIMUM 61 5:27 AM 39 1963 59 2 65
AVERAGE 68 68 0 74
PRECIPITATION (IN)
TODAY 0.00 1.98 1883 0.13 -0.13 0.00
MONTH TO DATE 4.48 2.94 1.54 0.11
SINCE SEP 1 4.48 2.94 1.54 0.11
SINCE JAN 1 40.33 29.34 10.99 30.89
Observations Archive
Hazardous Weather Outlook
Today: A chance of showers, mainly after 3pm. Areas of fog before 10am. Otherwise, mostly cloudy, with a high near 76°. South wind 5 to 8 mph. Chance of precipitation is 30%.
Tonight: A chance of showers. Mostly cloudy, with a low around 63°. Southeast wind 5 to 7 mph. Chance of precipitation is 40%.
Saturday: A chance of showers, mainly before 3pm. Patchy fog between 9am and noon. Otherwise, cloudy, with a high near 77°. Southeast wind around 6 mph. Chance of precipitation is 40%.
Saturday Night: A slight chance of showers before 9pm. Mostly cloudy, with a low around 65°. Southeast wind around 6 mph becoming calm after midnight. Chance of precipitation is 20%.
Sunday: Partly sunny, with a high near 82°. Calm wind becoming south around 6 mph in the afternoon.
Sunday Night: A slight chance of showers after 9pm. Partly cloudy, with a low around 66°. Chance of precipitation is 20%.
Monday: Partly sunny, with a high near 82°.
Monday Night: A chance of showers after 9pm. Partly cloudy, with a low around 67°. Chance of precipitation is 30%.
Tuesday: A chance of showers. Mostly cloudy, with a high near 78°. Chance of precipitation is 50%.
Tuesday Night: A chance of showers. Mostly cloudy, with a low around 60°. Chance of precipitation is 50%.
Wednesday: A chance of showers. Mostly sunny, with a high near 74°. Chance of precipitation is 40%.
Wednesday Night: A chance of showers. Partly cloudy, with a low around 56°. Chance of precipitation is 40%.
Thursday: Mostly sunny, with a high near 71°.
Baltimore/Washington Forecast Office
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Area Forecast Discussion
National Weather Service Baltimore MD/Washington DC
858 PM EDT Thu Sep 24 2020
.SYNOPSIS...
High pressure centered over the western Atlantic will promote a
return flow over the region as the remnants of Beta cross into
the Carolinas while weakening Friday into Saturday. High
pressure will remain in control for the latter half of the
weekend before a cold front drops southeastward from the Great
Lakes early next week.
.NEAR TERM /UNTIL 6 AM FRIDAY MORNING/...
High pressure will remain offshore tonight while the remnants of
Beta track through the Tennessee Valley. Plenty of high and
mid-level clouds will continue to pass through the area
tonight, but the remnants of Beta should remain far enough to
the south for dry conditions.
Areas of fog and low clouds are possible overnight due to more
low-level moisture compared to recent nights, light winds, and
the fact that the high and mid-level cloud deck is thin. Locally
dense fog is possible. Will have to monitor observations
overnight to see if a Dense Fog Advisory is warranted.
The clouds along with a weak WAA regime will result in slightly
above normal temps, with 50s to near 60 degrees expected.
.SHORT TERM /6 AM FRIDAY MORNING THROUGH SATURDAY NIGHT/...
Latest guidance favors keeping the heaviest precip associated
with the remnants of Beta to our south, mainly across extreme
southern Virginia and the Carolinas Friday into Friday night.
That being said, am carrying middle of the road chance POPs
south of the District Friday afternoon and evening, with
central Virginia carrying the highest chances and QPF potential
once again. Ample cloud cover will keep temperatures in the
upper 60s to near 70 degrees over our southern zones, with low
to middle 70s further north where slight rain chances exist.
The primary upper trough axis crosses the area Friday night, so
will maintain chance POPs into Saturday morning for areas east
of the Blue Ridge and over the Chesapeake Bay. Slightly above
normal temperatures will persist through Friday night.
Lingering showers will be possible Saturday morning over the
eastern half of the CWA as the upper trough exits to our east,
however a light onshore flow may aid in keeping clouds around
through a good portion of the day before some clearing commences.
High pressure will nudge back overhead Saturday night as an
upper ridge builds overhead. Near to slightly above normal
temperatures expected Saturday and Saturday night as dewpoints
elevate into the 60s. With increasing low level moisture,
patchy fog will be possible Saturday night as well.
.LONG TERM /SUNDAY THROUGH THURSDAY/...
Global models show a split jet configuration with a residual
southern stream impulse ejecting out of the Ozarks early Sunday.
This will likely shear on its northeastward progress into the Mid-
Atlantic during the overnight hours. Within the northern branch of
the jet, synoptic flow is forecast to be amplified and progressive.
A fairly potent jet streak will likely accompany these height falls
with an array of solutions noted in the guidance. While the core of
lower heights remain along the Ontario/Great Lakes border, some of
the global models show an embedded impulse which may attain a
negative tilt on its pursuit toward the Eastern Seaboard. Forecast
solutions are quite variable in terms of placement, magnitude, and
timing. Thus, confidence is low at this juncture, but showers and
thunderstorms are likely early next week. Eventually a cold frontal
passage will ensue ushering in cooler, drier air as cyclonic flow
sets up across the northeastern quadrant of the U.S. by mid-week.
To conclude the weekend, warm and humid conditions will prevail as
southwesterly flow steers Gulf moisture up the East Coast. Sunday`s
dew point temperatures are forecast to reach the upper 60s
accompanied by highs in the low 80s. While pre-frontal, Monday could
cool down a bit given the increase in cloud cover from warm
advection processes. Even upon cold frontal passage, initial cooling
will be stunted given well-mixed downsloping flow. Eventually highs
around 70 degrees are possible by mid-week although quite a bit of
spread is noted in the ensemble spread plots.
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