Area Forecast Discussion
Issued by NWS Sterling, VA

Current Version | Previous Version | Text Only | Print | Product List | Glossary Off
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 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50
-- Highlight Changed Discussion --
-- Discussion containing changed information from previous version are highlighted. --
000 FXUS61 KLWX 231956 AFDLWX Area Forecast Discussion National Weather Service Baltimore MD/Washington DC 256 PM EST Tue Jan 23 2018 .SYNOPSIS...
-- Changed Discussion --
High pressure will build over the region through Thursday night, then move offshore Friday. A cold front will move through the area Sunday afternoon.
-- End Changed Discussion --
&& .NEAR TERM /THROUGH WEDNESDAY/...
-- Changed Discussion --
Cdfnt has cleared the Chesapeake Bay with N to NW winds and dewpoints now in the 30s and 40s. Expect a brief episode of gusty winds of up to 40 mph due to decent pressure surge of 3-5 mb/3hr moving across the area. Expect clearing east of the Appalachians with upslope snow showers increasing in cvrg mainly after midnight as initially moisture will be shallow and temps aloft won`t that be cold. After midnight, temps aloft cool down resulting in increasing snow rates, but amts are expected to remain below advzy criteria. Clearing east of the Appalachians and turning chilly everywhere tonight. Cooler tomorrow under building high pressure, but still above normal.
-- End Changed Discussion --
&& .SHORT TERM /WEDNESDAY NIGHT THROUGH THURSDAY NIGHT/...
-- Changed Discussion --
High pressure will remain in control through Thu night with more seasonable temps. Light snow showers are expected to continue over the Appalachians Wed night before diminishing by Thu morning.
-- End Changed Discussion --
&& .LONG TERM /FRIDAY THROUGH TUESDAY/...
-- Changed Discussion --
Dry conditions expected for Friday as high pressure moves offshore and winds become southerly. High temperatures will be between the mid 40s and low 50s... and low temperatures Friday night in the 30s. Dry conditions expected again on Saturday as high pressure continues to push east into the Atlantic and warm advection increases. A slight chance of showers is possible in the afternoon/evening ahead of a cold front, but looking more likely to the western part of our CWA. PoPs increases Saturday into Sunday as cold front approaches from the west and then moves through on Sunday. Guidance suggests precipitation could last into Sunday night, therefore have to watch temperatures for ptypes concerns, especially for higher elevations. Dry conditions return sometime on Monday and into Tuesday with high pressure in control of our area.
-- End Changed Discussion --
&& .AVIATION /20Z TUESDAY THROUGH SUNDAY/...
-- Changed Discussion --
Gusty winds up to 30 kt through this aftenoon with pressure surge, then diminishing winds to 10 kt or less. Winds pick up again Wed with gusts up to 20 kt. VFR conditions. VFR conditions expected between Friday and Saturday with high pressure moving south or near our area. Sub-VFR conditions possible Saturday night into Sunday with cold front moving through.
-- End Changed Discussion --
&& .MARINE...
-- Changed Discussion --
Gusts between 25-30kt expected through this afternoon diminishing in the evening. Winds will likely die down later tonight and then pick up again Wed. Wind gusts will be below SCA criteria most times Friday into Sunday. There might be short periods where SCA criteria might be reached Saturday or Saturday night.
-- End Changed Discussion --
&& .LWX WATCHES/WARNINGS/ADVISORIES...
-- Changed Discussion --
DC...None. MD...None. VA...None. WV...None. MARINE...Small Craft Advisory until 9 PM EST this evening for ANZ530>543. Small Craft Advisory from 8 AM to 7 PM EST Wednesday for ANZ530>532-535-536-538>542. Small Craft Advisory from 6 AM to 7 PM EST Wednesday for ANZ533-534-537-543.
-- End Changed Discussion --
&& $$ SYNOPSIS...LFR NEAR TERM...LFR SHORT TERM...LFR LONG TERM...IMR AVIATION...IMR/LFR MARINE...IMR/LFR

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