Area Forecast Discussion
Issued by NWS Sterling, VA

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FXUS61 KLWX 210131

Area Forecast Discussion
National Weather Service Baltimore MD/Washington DC
931 PM EDT Tue Jun 20 2017

High pressure will be perched west of the area through Thursday.
A cold front will cross the area Friday into Saturday, with
tropical moisture streaming into the Mid Atlantic.


Had to keep an eye on showers that popped up near Baltimore that
produced some brief heavy downpours but these weakened with

Summer solstice occurs at 12:24 am.

Drier air slowly infiltrating the forecast area. Broad, diffuse
high pressure will remain west of the area through the night.

Dewpoints now in the 50s areawide, which should make for a
comfortable evening. Some mid level clouds likely will preclude
optimal cooling. Lows ranging from the mid 50s far west to near
70 along the Bay.


Weather will be benign for the next couple of days. A shortwave
crossing from the Great Lakes to the northeast Wednesday could
provide a little moisture. Have limited chance PoPs (mostly
showers, perhaps a rumble of thunder) to northern Maryland and
the Potomac Highlands. The lingering baroclinic zone from
yesterdays cold front could also yield a thunderstorm to the
tip of southern Maryland.

Thursday we will be in the subsidence in the wake of the trough
axis. Temperatures at 850 mb do rise slightly, so will bump high
temps up to near 90. Dewpoints increase a pinch as well, into
the 60s.

Eyes will then turn to the Gulf of Mexico to see what the pace
of that precip will be. Given the range of possibilities will
take a tempered approach...20-30 PoP after midnight.


Moisture and perhaps circulation from the remnants of Tropical Storm
Cindy look to be drawn toward the Mid-Atlantic ahead of a cold front
that is expected to cross the area Friday night into Saturday. This
could produce enhanced rainfall Friday until the cold frontal
passage over the Mid-Atlantic.

Once the cold front passes, 12Z GFS/ECMWF suggest weak surface high
pressure over the area for the rest of the outlook period.


VFR conditions for the valid TAF period and beyond. Winds west
or southwest at 10 kt or less through Wednesday. There could be
a few sprinkles or a light shower Wednesday afternoon,
especially MRB. Do not believe that there will be an operational

Flow turns more southerly Thursday; again, no impacts.

Remnants from Cindy look to be drawn to the Mid-Atlantic Friday into
Saturday ahead of a cold front that crosses on Saturday. This may
lead to enhanced rainfall and limited aviation conditions.


Winds have diminished over much of the waters but may linger
tonight for the Drum Point to Smith Point/Tangier Sound area,
where the pressure gradient would be greater.

Winds will be southerly, or have a primary south component,
through Thursday. From this vantage point, it appears as though
gusts shouldn`t exceed 10-15 kt.

Remnants from Cindy look to be drawn to the Mid-Atlantic Friday into
Saturday ahead of a cold front that crosses on Saturday. This may
lead to enhanced rainfall and SCA level winds over the Chesapeake


MARINE...Small Craft Advisory until 6 AM EDT Wednesday for ANZ534-537-


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