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-- Discussion containing changed information from previous version are highlighted. --
000
FXUS61 KLWX 090807
AFDLWX

Area Forecast Discussion
National Weather Service Baltimore MD/Washington DC
407 AM EDT Thu Sep 9 2021

.SYNOPSIS...
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A cold front slowly crossing the area will push off to the
southeast later this morning. Thereafter, sprawling high
pressure build eastward from the central U.S., moving overhead
Friday before shifting offshore early next week.
-- End Changed Discussion --

&&

.NEAR TERM /THROUGH TONIGHT/...
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A cold front is slowly crossing the Blue Ridge Mountains this
morning with scattered shower and isolated thunderstorm activity
ongoing along and east of the boundary. There is some
instability remaining east of the front, where the isolated
thunderstorm activity is being seen, with bouts of moderate to
heavy rain possible with their passage. The Flash Flood Watch
has been cancelled for all areas as the heavier shower/storm
activity is on a downward trend. Cloudy skies with temperatures
in the 60s to low 70s is the norm across the CWA early this
morning.

The front will continue its slow southeastward progression this
morning, exiting the southeastern portion of the CWA by late
morning. However, the primary trough axis won`t actually make
its crossing until this evening. As a result, outside of
lingering shower activity east of the Blue Ridge Mountains this
morning, additional showers will be possible this afternoon,
albeit low end chance. Plentiful cloud cover should hold
temperatures in the 70s for most today, while 60s hold strong
along the Alleghenies.

Clearing skies and cool temperatures is in store tonight as the
aforementioned trough axis pushes to our east and high pressure over
the central U.S. nudges eastward. Lows tonight will drop back into
50s, near 60 in the city centers, with 40s in the higher
elevations.
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&&

.SHORT TERM /FRIDAY THROUGH SATURDAY NIGHT/...
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High pressure to our west will build overhead late Friday into
Saturday, before centering to our southeast Saturday night.
Resultant weather will be clear skies, dry conditions, and
cooler than normal temperatures. Northwest breezes on Friday
will turn more southerly by Saturday afternoon, but remain on
the lighter side. Highs Friday will hold in the mid to upper
70s, with 60s in the mountains, while overnight lows drop into
the 40s and 50s once again. As southerly breezes reemerge on
Saturday, temperatures will be a touch warmer, generally in the
upper 70s to low 80s and lows Saturday night back into the
middle 50s to middle 60s.
-- End Changed Discussion --

&&

.LONG TERM /SUNDAY THROUGH WEDNESDAY/...
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Ridge of high pressure at the sfc and aloft will remain the dominant
wx feature next week and support above normal temperatures and dry
conditions. However, ISOLD showers/t-storms will still be possible
over the Appalachian Mountains Tue-Thu.
-- End Changed Discussion --

&&

.AVIATION /08Z THURSDAY THROUGH MONDAY/...
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A cold front will press southeast of the terminals this morning
as shower activity lingers and winds remain light out of the
northwest. MVFR CIGs this morning will improve to VFR by this
afternoon and remain as such through tonight with light
northwest winds.

High pressure moves back into the region Friday and Friday
night, but with a bit of a gradient Friday morning and
afternoon, which could yield northwest wind gusts to around 20
knots at times. The gradient relaxes Friday night with the high
overhead and VFR conditions persisting. Winds will turn light
and southerly Saturday as the high centers south of the area and
VFR conditions continue.

No sig wx expected Sun through Tue.
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&&

.MARINE...
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A cold front will cross the waters this morning, delivering
scattered showers and isolated thunderstorms. SCA gusts expected
through sunrise over the lower Chesapeake Bay and tidal Potomac
zones. As the front lingers nearby early this morning, the
potential for waterspouts will exist early this morning with
any developing shower or storm, mainly south of North Beach. The
front will push southeast of the waters later this morning with
a downward trend in shower activity.

A secondary front will slide across the waters later this
evening and overnight, increasing winds out of the northwest.
Have issued a Small Craft Advisory overnight and persisting
through the day on Friday as northwest winds gust to around 20
knots. High pressure nudges overhead late Friday and Friday
night with light northwest winds. The high will center itself to
the south and east Saturday as winds turn southerly but remain
sub SCA.

SCA conditions are possible Sun in srly flow. Gradient relaxes
after Sun with fair weather expected.
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&&

.TIDES/COASTAL FLOODING...
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Coastal Flood Advisory is in effect for Annapolis. Current anomaly
is running around 1.35 ft and trending down, but does not appear it
will be low enough by the time of the next high tide at 716 AM to
prevent coastal flooding.
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&&

.LWX WATCHES/WARNINGS/ADVISORIES...
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DC...None.
MD...Coastal Flood Advisory until 9 AM EDT this morning for MDZ014.
VA...None.
WV...None.
MARINE...Small Craft Advisory from midnight tonight to 6 PM EDT Friday
     for ANZ530>534-537-539>541-543.
     Small Craft Advisory from 6 AM to 6 PM EDT Friday for ANZ535-
     536-538-542.
     Small Craft Advisory until 5 AM EDT early this morning for
     ANZ534-537-543.
-- End Changed Discussion --

&&

$$
SYNOPSIS...BKF
NEAR TERM...BKF
SHORT TERM...BKF
LONG TERM...LFR
AVIATION...BKF/LFR
MARINE...BKF/LFR
TIDES/COASTAL FLOODING...LFR