Area Forecast Discussion
Issued by NWS Sterling, VA

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FXUS61 KLWX 150900
AFDLWX

Area Forecast Discussion
National Weather Service Baltimore MD/Washington DC
400 AM EST Sun Jan 15 2017

.SYNOPSIS...

High pressure will build over the area through tonight. A stationary
front over the southern Mid-Atlantic states will move north as a
warm front Tuesday. A weak cold front will push through the area
Wednesday.

&&

.NEAR TERM /TODAY/...

As of 330am, closed upper level low pressure is over NWrn Mexico, a
1034mb surface high is centered over La Crosse, WI. Low pressure
developing off the Delmarva coast and the approaching high have
ended the cold air damming wedge. Light NW winds have overspread the
area with mist and low clouds slowly eroding. Pockets of freezing
temperatures north through sunrise.

Sunny start today with increasing clouds this afternoon ahead of a
warm front. Max temps a few degrees above normal today; expect mid
to upper 40s.

&&

.SHORT TERM /TONIGHT THROUGH TUESDAY NIGHT/...

Despite 1030mb surface high pressure building over the central mid-
Atlantic tonight, upper level lift/a developing warm front
associated with the SWrn low looks to bring rain into the area
tonight. There is a chance for a wintry mix late tonight on the
northern fringes of the precip shield that develops.

High pressure shifts offshore Monday with the warm front lifting
north of the area and return southerly flow developing. However,
little mixing during the day likely makes for a cooler Monday than
Sunday by a couple degrees.

Low pressure moves NE across the Great Lakes Tuesday with another
warm front entering the area. Areas of rain cross the area with a
quarter to a half inch of rain. Perhaps this is enough to close the
gap on our seasonal deficit.

&&

.LONG TERM /WEDNESDAY THROUGH SATURDAY/...

One thing seems clear - cold air will be held at bay for the
extended part of the forecast in what is climatologically the
coldest time of the year.

Wednesday does look to start out showery as a short wave tracks
through the Mid Atlantic followed by clearing Wednesday afternoon/
overnight. Highs should climb into the 50s with lows staying above
freezing.

Temperature-wise both Thursday and Friday should also see highs
rise into the 50s. Models do begin to disconnect for the second
half of the week - Euro has east coast under a ridge Thursday while
GFS shows a trough moving through. While we are in fast upper
level flow not sure the change is so rapid that another trough
will move over us...and prefer the drier solution.

By choosing the Euro depiction this would lead to the next short
wave approaching the region Friday. Because of this have added low
chance PoPs to the day. P-type would only be rain. This is still
over five days away so there will likely be alteration to the
forecast.

&&

.AVIATION /08Z SUNDAY THROUGH THURSDAY/...

IFR conds early this morning eroding in light NWly flow.
Temperatures remain near freezing in northern DC metros through
sunrise. VFR after sunrise through this evening. A warm front brings
chances for rain tonight. Light freezing rain possible in the DC
metros.

Light southerly flow develops Monday. Another warm front brings
south winds, rain, and IFR conds Tuesday.

Showers possible Wednesday then VFR Wednesday afternoon through
Thursday.

&&

.MARINE...

NW flow increases this morning with 18kt gusts possible on southern
MD waters were a morning SCA is in effect. High pressure moves
overhead tonight with light southerly flow Monday through Tuesday.

Winds expected to remain below SCA values Wednesday and Thursday.

&&

.LWX WATCHES/WARNINGS/ADVISORIES...
DC...None.
MD...None.
VA...None.
WV...None.
MARINE...Small Craft Advisory from 6 AM this morning to noon EST today
     for ANZ534-537-543.

&&

$$
PRODUCTS...BAJ/WOODY!



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