Sunrise 6:23 AM   Sunset 7:51 PM Moonrise 2:55 PM   Moonset 3:40 AM

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ANZ535 Tidal Potomac From Key Bridge To Indian Head- 553 Pm Edt Fri Apr 19 2024
.small craft advisory in effect from Saturday afternoon through late Saturday night - .
Tonight - SE winds 5 to 10 kt - .becoming W after midnight. Waves 1 ft. A chance of showers. Sat - NW winds 10 to 15 kt with gusts to 25 kt. Waves 1 ft. Sat night - NW winds 10 to 15 kt. Gusts up to 25 kt. Waves 1 ft. Sun - NW winds 5 to 10 kt. Waves 1 ft. Sun night - NW winds 5 kt. Waves less than 1 ft. Mon - NW winds 5 to 10 kt. Waves 1 ft. Mon night - N winds 5 to 10 kt. Waves 1 ft. Tue - S winds 10 to 15 kt. Waves 1 ft. Wed - SW winds 10 to 15 kt - .becoming nw. Waves 1 ft. A chance of showers.

ANZ500 553 Pm Edt Fri Apr 19 2024
Synopsis for the tidal potomac and md portion of the chesapeake bay -
a cold front will pass through the region tonight into Saturday morning. High pressure gradually pushes in from the west over the weekend while low pressure passes well to the south. The high will move overhead Monday and Tuesday. Small craft advisories may be needed Tuesday.

FXUS61 KLWX 191930 AFDLWX

Area Forecast Discussion National Weather Service Baltimore MD/Washington DC 330 PM EDT Fri Apr 19 2024

SYNOPSIS
Low pressure will track well to our north today, causing a cold front to move through later tonight. High pressure will build into the area for this weekend into early next week. Low pressure will track to our north on Wednesday, causing another cold front to move through the area.

NEAR TERM /THROUGH TONIGHT/
Low pressure continues to track well to our north toward Hudson Bay this afternoon. A cold front trails well to the south of this area of low pressure across the Great Lakes and into the Ohio/Tennessee Valleys. Radar imagery as of 3 PM shows one round of showers located to the east of the Blue Ridge. This activity should slowly progress off toward the east over the next few hours. There's a bit of a break in the activity to the west of the Blue Ridge currently, with some sunny breaks actually developing immediately in the lee of the Allegheny Front.

Additional showers are located further north and west, extending from western PA southward into WV. These showers are located just in advance of the system's cold front. This activity will slowly spread eastward across the forecast area later this afternoon through the overnight, along with the surface cold front. Showers are generally expected to be light and somewhat intermittent through the night, although there could be a thunderstorms or two to the west of the Blue Ridge later this afternoon or evening. Any storms are expected to stay sub- severe. The cold front will finally clear the area by around daybreak, bringing chances for showers to an end. Low temperatures overnight will range from the mid 50s along the I-95 corridor to near 40 in the mountains.

SHORT TERM /SATURDAY THROUGH SUNDAY NIGHT/
Low pressure will continue to depart well off to our north tomorrow. Post cold frontal northwesterly flow will gradually cool and dry out the boundary layer over the course of the day.
Skies will start out mostly cloudy, but gradual clearing is expected as drier air works into the area. Seasonable temperatures are in the forecast, with highs generally in the 60s to lower 70s for most (50s in the mountains). Winds may gust to around 20 to 30 mph out of the northwest during the afternoon.

Areas of low pressure will pass by both to our north and south Saturday night through Sunday night, with a narrow ridge of high pressure in place locally. Conditions will remain dry, with a mix of sun and clouds through that time. It will be cooler Sunday, with highs in the upper 50s/lower 60s for most. Some patchy frost may also be possible Saturday night or Sunday night in sheltered valleys to the west of the Blue Ridge.

LONG TERM /MONDAY THROUGH FRIDAY/
High pressure over the region kicks off the beginning of the work week on Monday with a weak shortwave passing to our south.
Tuesday will also be dry to start before high pressure moves offshore and low pressure with an associated cold front approaches from the west. Rain chances expand NW to SE across the area Tuesday night into Wednesday and exiting by Wednesday night. Another area of high pressure moves in behind it.

With the tight pressure gradient between the low pressure and the high pressure on the front and back ends of the system, gusty winds are likely during the day Tuesday through Wednesday night, and possibly lingering into Thursday. Southerly winds on Tuesday could gust up to 20-25 kt. Stronger NW gusts are likely behind the cold front on Wednesday during the day, up to around 25-30 kt.

Dry conditions continue Thursday into Friday with the next chance for precipitation approaching Friday night into the weekend.

Temperatures will be near normal on Monday in the 50s and 60s, and warm to above normal Tuesday into Wednesday with the southerly flow.
Highs on Wednesday will depend on the timing of the cold frontal passage as temps drop behind it. As such, expect it cooler on Thursday before moderating into the weekend.

AVIATION /19Z FRIDAY THROUGH WEDNESDAY/
Conditions are currently MVFR at most of the terminals, with IFR ceilings at MRB and CHO. MVFR ceilings will likely continue through much of the day, along with on and off showers. Ceilings may briefly drop back to IFR tonight, before a cold front moves through during the second half of the night. VFR conditions and increasing northwesterly winds are expected during the day tomorrow. Winds may gust to around 20-30 knots during the mid- late afternoon hours. Lighter west to northwesterly winds and VFR conditions are expected on Sunday.

VFR conditions are expected Monday and Tuesday. Dry conditions prevail with NW flow Monday becoming southerly and gusty on Tuesday, up to around 20-25 kt. As a cold front approaches Tuesday night, showers and possible sub-VFR conditions move into the forecast area but likely don't reach the terminals until Wednesday morning.

MARINE
Winds are currently sub-SCA level over the waters. There should be an increase in southerly winds this evening, and a SCA is in effect during that time for the wider waters. A cold front will move through later tonight, causing winds to turn northwesterly in its wake. SCAs may potentially be needed in northwesterly flow tomorrow. Sub-SCA northwesterly winds are expected on Sunday.

Northwest winds on Monday are expected to remain below SCA criteria and become southerly Monday night into Tuesday morning. As low pressure approaches the area, gusty southerly winds on Tuesday will likely exceed SCA criteria by the afternoon, and continue overnight and into Wednesday.

TIDES/COASTAL FLOODING
Tidal anomalies have drastically increased this morning into early this afternoon, causing water levels to rise rapidly.
Coastal Flood Advisories are in effect during the upcoming tidal cycle for DC/Alexandria, King George/Charles, Calvert, Baltimore, and Harford Counties, with Coastal Flood Warnings in effect for Anne Arundel and St. Mary's Counties. Water levels will likely remain elevated through the tide cycle tonight as well, and additional headlines may be needed. Anomalies should finally start to decrease late tonight into tomorrow as winds turn northerly and then eventually northwesterly, allowing water to drain out of the Bay.

LWX WATCHES/WARNINGS/ADVISORIES
DC...Coastal Flood Advisory until 9 PM EDT this evening for DCZ001.
MD...Coastal Flood Advisory until 9 PM EDT this evening for MDZ011.
Coastal Flood Warning until 8 AM EDT Saturday for MDZ014.
Coastal Flood Advisory until 3 AM EDT Saturday for MDZ016.
Coastal Flood Warning until 4 AM EDT Saturday for MDZ017.
Coastal Flood Advisory until 4 AM EDT Saturday for MDZ018.
Coastal Flood Advisory until 11 PM EDT this evening for MDZ508.
VA...Coastal Flood Advisory until 9 PM EDT this evening for VAZ054.
Coastal Flood Advisory until 3 AM EDT Saturday for VAZ057.
WV...None.
MARINE...Small Craft Advisory until midnight EDT tonight for ANZ532>534- 537-541-543.

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

Reagan National Airport
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Fri -- 12:12 AM EDT     0.63 feet Low Tide
Fri -- 04:39 AM EDT     Moonset
Fri -- 06:06 AM EDT     3.10 feet High Tide
Fri -- 06:25 AM EDT     Sunrise
Fri -- 12:34 PM EDT     0.60 feet Low Tide
Fri -- 03:54 PM EDT     Moonrise
Fri -- 06:30 PM EDT     3.01 feet High Tide
Fri -- 07:49 PM EDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION

Reagan National Airport, Washington, D.C., Tide feet

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