January 25, 2020
DC Climate Report
Solar Noon: 12:20;
Last 72 Hours: Observations
Forecast updates at 6 AM ET
Today: A chance of rain after 2pm. Cloudy, with a high near 50°. Light northeast wind becoming east 5 to 9 mph in the morning. Chance of precipitation is 30%.
Tonight: Rain, mainly after 11pm. Low around 44°. East wind 10 to 14 mph, with gusts as high as 21 mph. Chance of precipitation is 100%. New precipitation amounts between three quarters and one inch possible.
Saturday: Rain before 8am, then a chance of showers, mainly between 8am and 2pm. High near 52°. East wind 6 to 10 mph becoming west in the afternoon. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.
Saturday Night: Partly cloudy, with a low around 35°. West wind 5 to 9 mph.
Sunday: Mostly sunny, with a high near 48°. West wind 7 to 10 mph.
Sunday Night: Partly cloudy, with a low around 33°.
Monday: Mostly sunny, with a high near 47°.
Monday Night: Mostly cloudy, with a low around 33°.
Tuesday: Mostly sunny, with a high near 46°.
Tuesday Night: Mostly cloudy, with a low around 33°.
Wednesday: Partly sunny, with a high near 46°.
Wednesday Night: Mostly cloudy, with a low around 33°.
Thursday: Partly sunny, with a high near 45°.
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Time and Date
Discussion updates at 4 AM ET
FXUS61 KLWX 240128 AAA
Area Forecast Discussion...UPDATED
National Weather Service Baltimore MD/Washington DC
828 PM EST Thu Jan 23 2020
Low pressure will move toward the region Friday before passing
through Friday night into Saturday. The low will move
northeastward into New England during the second half of the
weekend. High pressure returns Sunday and lingers into early
.NEAR TERM /THROUGH FRIDAY/...
Overrunning precip will start spreading across the central
Shenandoah valley and the central Appalachians primarily after
12Z Fri. There is a non-zero (roughly 20-40%) chance that the
precip at the northern edge may fall in the form of freezing
rain where sfc temps may still be below freezing. At this time,
will have a mention of ra/fzra across western Allegany, western
Mineral, but no headlines given low confidence and low impact.
Rain should slowly overspread across western VA during the
daylight hours and across northeast MD Fri night.
.SHORT TERM /FRIDAY NIGHT THROUGH SATURDAY NIGHT/...
A large H5 low will continue to move through the Midwest,
tracking northeastward towards NY state. Precipitation will
begin to spread across the region, beginning mid AM Friday for
southwestern portions of the CWA, before slowly progressing
northeast into the metro areas Friday night. With strong
dynamical forcing in place, a secondary low will develop late
Friday night enhancing rainfall rates overnight. Expecting
higher QPF amounts of near 2 inches mainly along the Blue Ridge
due given stronger dynamical lift. Elsewhere, total QPF amounts
will be near 1 inch. Rain will begin to tapper off from
southwest to northeast Saturday AM before ending for the metros
by late Saturday afternoon. Partial clearing ensues into
Saturday night as the low exits the region. Strong westerly
winds and colder air aloft will induce upslope snow along the
western Allegheny Front into Sunday.
.LONG TERM /SUNDAY THROUGH THURSDAY/...
By Sunday low pressure, both surface and aloft, will be migrating
toward New England. The forecast area will be experiencing northwest
flow with scattered upslope snow showers Sunday and Sunday night...
possibly extending into Monday. Winds will be on the gusty side as
well, especially during the daytime hours when cold advection will
have a better chance to mix to the surface.
Tuesday into Wednesday will be the lull when a ridge axis
passes across the eastern CONUS. Thereafter, another transitory
upper level closed low and surface reflection will approach at
the end of the forecast period. Its too soon to get caught up
in the details for this system.
.AVIATION /01Z FRIDAY THROUGH TUESDAY/...
VFR conditions will continue through Friday morning as high
pressure moves offshore with light and variable winds. The one
exception will be around KCHO where MVFR cigs are possible as
early as late tonight. As low pressure develops from the SW,
reduced VSBYs/CIGs are anticipated as rain develops from a
CHO-DCA- MTN line from mid Friday AM into late Friday afternoon.
Winds will be increasing Friday night and remain breezy into
Saturday night, gusts up to 20 knots. Conditions will improve
Saturday afternoon into the night.
VFR should prevail across the terminals Sunday and Monday.
Winds will be from the west/northwest, with 20-25 kt gusts
Sunday resulting in the bigger operational impact.
Winds will remain light through Friday as high pressure slowly
moves offshore. Periods of SCA conditions possible Friday night
into Saturday night with low pressure impacting our area.
Small Craft Advisory possible Sunday (and maybe into Monday) in
cold northwest flow permitting 20+ kt gusts to mix to the
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