Area Forecast Discussion
Issued by NWS Sterling, VA

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FXUS61 KLWX 171501
AFDLWX

Area Forecast Discussion
National Weather Service Baltimore MD/Washington DC
1101 AM EDT Tue Apr 17 2018

.SYNOPSIS...
Low pressure over Quebec will maintain unseasonably
cool conditions through today. Weak high pressure will build
over the area late tonight into Wednesday. A cold front will
cross the area on Thursday. High pressure will build over the
region for the end of the week.

&&

.NEAR TERM /THROUGH TONIGHT/...
Lots of clouds today and reports of a few flurries. Expect a few
sprinkles or flurries to be meandering about as a vort max
pivots through today, with lots of clouds persisting. Highs will
struggle to reach 50.

Clearing and cold tonight with diminishing winds. More freeze
watches and/or warnings may be required as far east as U.S. Rt
15 and Rt 29 corridors and will likely issue them a little
later.

&&

.SHORT TERM /WEDNESDAY THROUGH THURSDAY NIGHT/...
Nice day on Wed as weak high pressure remains overhead. Warmer
with temperatures in the mid 60s and light winds. Clouds
increase late in the day ahead of next low pressure system
moving across the midwest. Nmrs-widespread rain showers
expected especially NW with lesser chances south and east. Cdfnt
crosses the area around 12Z Thu with cold air filtering in
quickly with rain showers turning to snow showers in the mtns.
Turning windy especially in the mtns and northeast MD where wind
advzy conditions are possible. Turning much colder Thu night and
remaining brisk with more freezing temperatures likely.

&&

.LONG TERM /FRIDAY THROUGH MONDAY/...
The long term will start out cool and breezy as high pressure
gradually builds in from the northwest while low pressure
strengthens as it heads its way northeast along the Maine coast.
There could be some lingering upslope snow showers along the
Allegheny Front Friday morning, but otherwise it should also be dry.

With Canadian high pressure building more firmly overhead Saturday
and Sunday, we will remain cool and dry, though the breeze should
diminish. We will once again have frost/freeze concerns Saturday and
Sunday mornings, but otherwise no hazardous weather is expected.

The northerly flow will become a bit more easterly by early next
week as high pressure slides towards northern New England and a low
pressure system moves east along the Gulf Coast. Otherwise, expect
the cool dry weather to continue into early next week.

&&

.AVIATION /15Z TUESDAY THROUGH SATURDAY/...
Breezy today with bkn-ovc cigs 040-050. Clearing tonight with
diminishing winds. VFR on Wed. Windy on Thu with gusts 30-40kt.

VFR conditions expected Friday and Saturday. A gusty northwest wind
on Friday should diminish Saturday.

&&

.MARINE...
SCA conditions today. Winds diminish late tonight. Gale
conditions possible on Thu.

Small Craft Advisories may be necessary Friday in the wake of low
pressure moving northeast along the Maine coast. Winds likely
diminish a bit Saturday.

&&

.LWX WATCHES/WARNINGS/ADVISORIES...
DC...None.
MD...Freeze Watch from late tonight through Wednesday morning for
     MDZ003>006-503>507.
VA...Freeze Watch from late tonight through Wednesday morning for
     VAZ025>031-036>040-050>053-501-502-505>508.
WV...Freeze Watch from late tonight through Wednesday morning for
     WVZ051>053.
MARINE...Small Craft Advisory until 6 AM EDT Wednesday for ANZ530>534-
     537-539>543.
     Small Craft Advisory until midnight EDT tonight for ANZ535-536-
     538.

&&

$$
SYNOPSIS...LFR
NEAR TERM...LFR/DHOF
SHORT TERM...LFR
LONG TERM...RCM
AVIATION...RCM/LFR/DHOF
MARINE...RCM/LFR/DHOF


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