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ANZ535 Tidal Potomac From Key Bridge To Indian Head- 1233 Pm Est Mon Dec 4 2023
This afternoon..W winds 5 kt. Waves less than 1 ft.
Tonight..NW winds 5 kt. Waves less than 1 ft.
Tue..NW winds around 5 kt. Waves 1 ft.
Tue night..N winds around 5 kt. Waves 1 ft. Scattered showers.
Wed..NW winds 5 to 10 kt with gusts to 20 kt. Waves 1 ft. Scattered showers.
Wed night..NW winds 5 to 10 kt. Waves 1 ft.
Thu..SW winds 5 to 10 kt. Waves 1 ft.
Fri..S winds 5 to 10 kt. Waves 1 ft.

ANZ500 1233 Pm Est Mon Dec 4 2023
Synopsis for the tidal potomac and md portion of the chesapeake bay..
low pressure will pass well south of the waters through tonight. A clipper system will cross the area Tuesday into Wednesday. High pressure will build over the region Thursday through Friday night. Small craft advisories are likely Wednesday into Thursday morning.

FXUS61 KLWX 041518 AFDLWX

Area Forecast Discussion National Weather Service Baltimore MD/Washington DC 1018 AM EST Mon Dec 4 2023

SYNOPSIS
A clipper system will cross the area Tuesday into Wednesday.
High pressure will build over the region Thursday through Friday night. A strong frontal system will likely impact the region late in the weekend.

NEAR TERM /THROUGH TONIGHT/
A potent mid/upper-level shortwave will traverse the Mid- Atlantic through this evening bringing widespread mid and high cloud cover. The low levels are dry and winds are downsloping out of the west, so precipitation looks unlikely except perhaps for a spotty flurry or sprinkle over the Allegheny Front. High temperatures will range from the 30s over the higher terrain to the 50s east of I-81/south of US-50.

A few extra flurries or a snow shower or two can't be ruled out along and west of the Allegheny Front tonight, but south-of-west flow and shortwave ridging should cut down on anything more than that. Further east, clouds will clear. Temperatures will fall into the mid 20s to mid 30s.

SHORT TERM /TUESDAY THROUGH WEDNESDAY NIGHT/
Second and stronger upper level disturbance will begin to dive from the western Great Lks Tue afternoon and reinforce the trough pattern across the East. Expect clouds to develop quickly by midday Tue with isold-sct rain showers expected at low elevations and snow showers across the higher terrain. Rain may also mix or change to snow along the Pennsylvania border Tue night. Snow showers will persist across the Appalachian region through Wed before trough axis shifts east of the region Wed night. A few inches of snow are likely across the Appalachian region which may require Winter Weather Advisories. In addition, brief rain or snow squalls are possible Wednesday everywhere.
Low-level thicknesses suggest p-type would be snow north of I-66 and rain south of there. Blustery Wed night with wind chills in the teens and twenties.

LONG TERM /THURSDAY THROUGH SUNDAY/
Chilly temperatures continue on Thursday in the wake of the aforementioned clipper low. High temperatures in the 40s can be expected.

High pressure will shift offshore on Friday into Saturday, meaning that we will see temperatures moderate a good bit. Highs in the mid to upper 50s are expected, with lows in the 30s.

Moving into Sunday, eyes turn towards a potent upper-level trough to our west. There is a lot of uncertainty at this point as to exactly what the main impacts from this system will be as it moves in our direction, as well as exactly when impacts may arrive. But there is the potential for a potent low pressure system and cold frontal passage. It will all depend on the track, so will have to monitor for a potential heavy rain and/or severe weather threat as we get closer in time and have a bit more consistency.

AVIATION /15Z MONDAY THROUGH FRIDAY/
VFR conditions are expected through Tuesday. Mid and high level broken/overcast conditions are anticipated today with W/SW wind gusts to 15 kts possible. VFR stratocu is most likely to prevail through Wednesday night in W/NW flow as a clipper system moves through. Drops in CIGs/VSBYs are likely especially west of US-15 Tuesday night into Wednesday morning as the clipper brings a round of showers, most likely in the form of snow for KMRB (with a mix possible elsewhere).

VFR conditions expected Thursday and Friday with winds out of the SSW on both afternoons at around 8 to 12 knots.

MARINE
An enhancement to northerly winds is expected tonight over the main channel of the Chesapeake Bay as a disturbance pushes to the east. A clipper system will swing through Tuesday into Wednesday with 25-30 kt gusts likely in its wake out of the W/NW. Winds begin to taper a bit Wednesday night, especially over narrower waterways, but 20-25 kt gusts likely persist over the wider waters until at least daybreak Thursday.

Winds taper off on Thursday and Friday, with mo marine hazards expected at this time.

LWX WATCHES/WARNINGS/ADVISORIES
DC...None.
MD...None.
VA...None.
WV...None.
MARINE...Small Craft Advisory from midnight tonight to 7 AM EST Tuesday for ANZ531>534-537-539>541-543.

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Chain Bridge
Click for Map
Mon -- 01:10 AM EST     2.61 feet High Tide
Mon -- 07:10 AM EST     Sunrise
Mon -- 07:54 AM EST     0.22 feet Low Tide
Mon -- 12:36 PM EST     Moonset
Mon -- 01:47 PM EST     2.43 feet High Tide
Mon -- 04:46 PM EST     Sunset
Mon -- 07:58 PM EST     0.26 feet Low Tide
Mon -- 11:40 PM EST     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION

Chain Bridge, D.C., Tide feet

Chain Bridge
Click for Map
Mon -- 01:05 AM EST     2.61 feet High Tide
Mon -- 07:10 AM EST     Sunrise
Mon -- 07:49 AM EST     0.22 feet Low Tide
Mon -- 12:35 PM EST     Moonset
Mon -- 01:42 PM EST     2.43 feet High Tide
Mon -- 04:46 PM EST     Sunset
Mon -- 07:53 PM EST     0.26 feet Low Tide
Mon -- 11:40 PM EST     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION

Chain Bridge, one mile below, D.C., Tide feet

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