Area Forecast Discussion
Issued by NWS Sterling, VA

Current Version | Previous Version | Text Only | Print | Product List | Glossary On
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29
000
FXUS61 KLWX 161443
AFDLWX

Area Forecast Discussion
National Weather Service Baltimore MD/Washington DC
1043 AM EDT Mon Apr 16 2018

.SYNOPSIS...
A strong cold front will cross the area later this
morning. Weak high pressure will gradually build back in for
Tuesday and Wednesday before another low pressure system crosses
the region Thursday. High pressure builds again over the region
for the latter part of the week.

&&

.NEAR TERM /THROUGH TONIGHT/...
Cold front along with main slug of rain and thunderstorms has
pushed to the northeast. Scattered showers beneath the upper
trough axis remain, and will continue to pivot through the area
through much of the day. It will turn cooler and breezy by mid
afternoon as the surface cold front pushes east and high
pressure builds into the region from the Ohio Valley.

Freezing temperatures are possible over parts of the Shenandoah
Valley tonight, but uncertainty remains. Will await later model
guidance before making a decision with the Freeze Watch.

&&

.SHORT TERM /TUESDAY THROUGH WEDNESDAY/...
Quite cool and breezy especially for mid April as area remains
under cyclonic flow aloft associated with low pressure over
the St. Lawrence river. Dry conditions expected except for some
upslope precipitation over the Appalachians.

&&

.LONG TERM /WEDNESDAY NIGHT THROUGH SUNDAY/...
Next frontal passage is expected Thursday with a chance of
showers. Precip will be significantly less with this system due
drier westerly sfc wind trajectories and not enough moisture
return. Quiet weather expected for the latter part of the week
as high pressure builds in.

&&

.AVIATION /15Z MONDAY THROUGH FRIDAY/...
Conditions gradually improve to VFR through the remainder of
today, but still bkn cigs 030-040 and breezy (NW flow). VFR
expected to remain with breezy conditions through Tuesday
evening. Winds become light as high pressure moves overhead
Wednesday. Frontal passage expected Thu with sct showers and
gusty W winds (30+ kts possible).

&&

.MARINE...
SCA through Tuesday evening as pres gradient remains tight. SCA
likely again Thursday with gales possible as low pressure passes
across the Great Lakes resulting in increased westerly flow.

&&

.HYDROLOGY...
Flash flood warning in effect for the Cameron run
in Alexandria and Fairfax county where river gauge indicated the
creek had risen above flood stage. A flood warning is also in
effect for the South Branch Potomac River in Franklin, WV.

&&

.TIDES/COASTAL FLOODING...
Minor coastal flooding is expected at
most sites, perhaps even moderate flooding at Annapolis and
Straits Point. We`ll reevaluate situation later this morning and
upgrade to a warning if necessary.

&&

.LWX WATCHES/WARNINGS/ADVISORIES...
DC...Coastal Flood Advisory until 1 AM EDT Tuesday for DCZ001.
MD...Freeze Watch from late tonight through Tuesday morning for
     MDZ003>005.
     Coastal Flood Advisory until 11 PM EDT this evening for MDZ014.
     Coastal Flood Advisory until 5 AM EDT Tuesday for MDZ016.
     Coastal Flood Advisory until 7 AM EDT Tuesday for MDZ017.
     Coastal Flood Advisory until 6 AM EDT Tuesday for MDZ018.
     Coastal Flood Advisory until 4 PM EDT this afternoon for
     MDZ508.
     Coastal Flood Advisory until 10 PM EDT this evening for MDZ011.
VA...Freeze Watch from late tonight through Tuesday morning for
     VAZ025>031-507-508.
     Coastal Flood Advisory until 5 AM EDT Tuesday for VAZ057.
     Coastal Flood Advisory until 1 AM EDT Tuesday for VAZ054.
WV...Freeze Watch from late tonight through Tuesday morning for
     WVZ051>053.
MARINE...Small Craft Advisory until midnight EDT Tuesday night for
     ANZ530>532-535-536-538>540.
     Small Craft Advisory until 6 AM EDT Wednesday for ANZ533-534-
     537-541>543.

&&

$$
SYNOPSIS...LFR/DHOF
NEAR TERM...LFR/DHOF
SHORT TERM...LFR
LONG TERM...RCM
AVIATION...RCM/LFR/DHOF
MARINE...RCM/LFR/DHOF
HYDROLOGY...LFR
TIDES/COASTAL FLOODING...LFR



USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.