Thursday, July29, 2021
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Marine Weather and Tides
Aquia Harbour, VA

Version 3.4
NOTICE
3/30/2021 -- ANZ330 has been split into ANZ331 and ANZ332. Click EDIT in Marine Forecast and select your new zone.
1/26/2021 -- The West Coast Satellite images havd been updated. They now use GEOS-17.
1/1/2021 -- The 7 day forecast are now working well. Thank you NOAA for your support.

Sunrise 6:08AMSunset 8:24PM Thursday July 29, 2021 9:48 PM EDT (01:48 UTC) Moonrise 10:48PMMoonset 10:50AM Illumination 68% Phase: Waning Gibbous; Moon at 20 days in cycle
NOTE: Some of the data on this page has not been verified and should be used with that in mind. It may and occasionally will, be wrong. The tide reports are by xtide and are NOT FOR NAVIGATION.
Marine Forecasts
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ANZ536 Tidal Potomac From Indian Head To Cobb Island- 809 Pm Edt Thu Jul 29 2021
.small craft advisory in effect from 8 am edt Friday through late Friday night...
Tonight..SW winds 5 kt. Waves less than 1 ft. A slight chance of showers and tstms.
Fri..NW winds 5 to 10 kt with gusts to 20 kt. Waves 1 ft.
Fri night..N winds 5 to 10 kt with gusts to 20 kt. Waves 1 ft.
Sat..NW winds around 5 kt. Waves 1 ft.
Sat night..SE winds around 5 kt. Waves 1 ft.
Sun..S winds 5 kt. Waves less than 1 ft. A chance of showers.
Sun night..W winds 5 kt. Waves less than 1 ft.
Mon..E winds around 5 kt. Waves 1 ft. A chance of showers after midnight.
Tue..E winds around 5 kt. Waves 1 ft. A chance of showers. Winds and waves higher and visibilities lower in and near tstms.
ANZ500 809 Pm Edt Thu Jul 29 2021
Synopsis for the tidal potomac and md portion of the chesapeake bay.. A strong cold front will approach the area through this evening before crossing the region late tonight. A second, weaker front will cross the region Friday night. High pressure will build in for Saturday before another area of low pressure possibly affects the region Sunday. Small craft advisories may be needed Friday night.


7 Day Forecast for Marine Location Near Aquia Harbour CDP, VA
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location: 38.42, -77.35     debug


Area Discussion for - Baltimore, MD/Washington
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FXUS61 KLWX 300112 AFDLWX

Area Forecast Discussion National Weather Service Baltimore MD/Washington DC 912 PM EDT Thu Jul 29 2021

SYNOPSIS. A cold front will move through tonight. A reinforcing front will move through tomorrow, with high pressure building in its wake for the first half of the weekend. Additional low pressure systems may impact the region from Sunday into the early to middle portions of next week as troughing becomes established over the eastern half of the country.

NEAR TERM /UNTIL 6 AM FRIDAY MORNING/. 9:15 PM UPDATE: A line of discrete thunderstorms, leftover from a MCS across the Ohio Valley this afternoon/evening, is pushing towards the Allegheny Front at this time. With sunset, we are beginning to generally lose instability across the entire area, however, this particular area still hasn't really been worked over form previous convection today, so there seems to be just enough to get a few intense storms. To this point, any convection that has approached the Allegheny Front this evening has quickly weakened. However, can't rule out that these storms stay a bit more organized, with perhaps a severe storm or two over the next hour or two. Do think this activity tapers off quickly as it hits the mountains though.

The cold front is still over the Ohio valley, but it will move southward through the area during the second half of the overnight, bringing and end to any thunderstorm chances after midnight.

SHORT TERM /6 AM FRIDAY MORNING THROUGH SATURDAY NIGHT/. By daybreak tomorrow, the cold front will be situated just to our south, and will continue to push further to our south throughout the day. Much drier air will gradually advect into the area in northwesterly flow behind the front, with dewpoints dropping from the upper 60s around daybreak to the 50s by evening. Cold advection aloft will largely be offset by diurnal heating, with high temperatures still climbing into the mid to upper 80s. Mostly sunny skies are expected along with a northwesterly breeze. Winds may gust to in excess of 20 mph during the afternoon hours.

A reinforcing cold front will move through tomorrow night, with cooler and even drier air moving into the are in its wake. Lows Friday night will dip into the 50s across the northwestern half of the forecast area, with lower 60s across the southeastern half of the area.

A mix of sun and some high clouds is expected on Saturday as high pressure builds over the Ohio Valley. Winds will be lighter compared to tomorrow. Temperatures will only reach into the upper 70s to lower 80s, and dewpoints will drop into the upper 40s and lower 50s, leading to an uncharacteristically cool day for late July, with well below normal humidity values.

LONG TERM /SUNDAY THROUGH THURSDAY/. A mid-level trough of low pressure and a surface front will bring a chance of showers and thunderstorms Sunday. Highs in the middle 80s.

Weak high pressure will build in behind the front and bring dry and slightly cooler temperatures into the region Sunday night and Monday. Highs Monday lower to middle 80s.

As for Tuesday and Wednesday, a variety of uncertainties expected with a possible front dropping in from the northwest, a possible coastal low to the south and southeast, and timing of each. Should the front win out on verifying, then severe weather could be possible mainly in the western and central zones. If the coastal low wins, then more of a persistent modest rain could evolve which could lead to some localized flooding in the heaviest activities. Highs each day will be in the middle to upper 80s.

AVIATION /01Z FRIDAY THROUGH TUESDAY/. VFR conditions are expected tonight through Saturday. Winds may gust to around 20 knots out of the northwest tomorrow afternoon. Lighter winds are expected on Saturday as high pressure builds toward the area from the Ohio Valley.

Isolated showers or a thunderstorm near a few of the terminals could reduce conditions to MVFR briefly; otherwise, VFR conditions expected Sunday through Monday night. Winds southwest 5 to 10 knots Sunday, becoming northwest 5 knots Sunday night. Winds northwest becoming northeast 5 to 10 knots Monday. Winds light and variable Monday night.

MARINE. Small Craft Advisory remains in effect for our southern Bay zones tonight. SCA winds are expected again tomorrow in northwesterly flow behind a cold front, and this will be for all waters. Have extended that SCA into tomorrow night with this package, as a reinforcing cold front moves through. Lighter west to northwesterly winds are expected over the waters on Saturday.

No marine hazards expected Sunday through Monday night. Winds southwest 10 knots Sunday, then northwest becoming northeast 5 to 10 knots Sunday night and Monday. Winds light and variable Monday night.

TIDES/COASTAL FLOODING. Southerly flow ahead of an approaching cold front will result in some locations reaching action stage through tonight. Minor flooding is forecast at Annapolis, albeit barely, so a Coastal Flood Advisory was added with this package as well. As the winds become northwest behind the front on Friday, the anomalies will decrease quickly.

LWX WATCHES/WARNINGS/ADVISORIES. DC . None. MD . Coastal Flood Advisory until 1 AM EDT Friday for MDZ014. VA . None. WV . None. MARINE . Small Craft Advisory from 8 AM Friday to 6 AM EDT Saturday for ANZ530>533-535-536-538>542. Small Craft Advisory until 6 AM EDT Saturday for ANZ534-537- 543.

SYNOPSIS . CJL/KJP NEAR TERM . CJL/KJP SHORT TERM . KJP LONG TERM . KLW AVIATION . KLW/CJL/KJP MARINE . KLW/CJL/KJP TIDES/COASTAL FLOODING . CJL/KJP


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
NCDV2 18 mi54 min S 2.9 G 5.1 77°F 87°F1009.1 hPa
WASD2 - 8594900 - Washington, DC 36 mi54 min SSW 5.1 G 7 80°F 84°F1009.6 hPa
BSLM2 - Chesapeake Bay, MD 42 mi78 min Calm 72°F 1009 hPa71°F
PPTM2 - 8578240 - Piney Point, MD 48 mi54 min WSW 5.1 G 13
SLIM2 - 8577330 - Solomons Island, MD 48 mi54 min WSW 11 G 13 81°F 84°F1009.5 hPa

Wind History for Washington, DC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Stafford, Stafford Regional Airport, VA6 mi53 minN 07.00 miPartly Cloudy74°F71°F89%1011.2 hPa
Quantico Marine Corps Airfield - Turner Field, VA7 mi52 minVar 36.00 miPartly Cloudy with Haze78°F73°F85%1010 hPa
Fredericksburg, Shannon Airport, VA12 mi53 minS 310.00 miFair75°F74°F98%1009.5 hPa
Warrenton-Fauquier Airport, VA22 mi53 minN 010.00 miPartly Cloudy75°F72°F91%1010.2 hPa
Manassas, Manassas Regional Airport/Harry P. Davis Field, VA23 mi52 minN 010.00 miFair76°F73°F91%1010.4 hPa
Fort Belvoir, VA23 mi3.9 hrsW 10 G 2010.00 miA Few Clouds83°F74°F75%1010.7 hPa

Link to 5 minute data for KRMN

Wind History from RMN (wind in knots)
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Last 24hrCalmCalmNE7NW6CalmCalmCalmCalmCalmCalmCalmS4W5S3CalmCalmCalmCalmCalmCalmCalmCalmCalmCalm
1 day agoCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmN5W3CalmCalmE4CalmCalmCalmCalmNE9
2 days agoSE4W3N3NW5CalmCalmCalmCalmCalmCalmW3NW3CalmCalmCalmCalmNE3S6SW3CalmCalmCalmCalmCalm

Tide / Current Tables for Aquia Creek, Virginia
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Aquia Creek
Click for Map
Thu -- 04:49 AM EDT     0.23 feet Low Tide
Thu -- 06:09 AM EDT     Sunrise
Thu -- 10:36 AM EDT     1.27 feet High Tide
Thu -- 11:50 AM EDT     Moonset
Thu -- 05:10 PM EDT     0.10 feet Low Tide
Thu -- 08:22 PM EDT     Sunset
Thu -- 11:17 PM EDT     1.35 feet High Tide
Thu -- 11:47 PM EDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.110.80.50.30.20.40.70.91.11.21.31.10.90.70.50.30.10.20.50.811.21.3

Tide / Current Tables for Quantico Creek, Virginia
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Quantico Creek
Click for Map
Thu -- 05:36 AM EDT     0.19 feet Low Tide
Thu -- 06:08 AM EDT     Sunrise
Thu -- 11:50 AM EDT     Moonset
Thu -- 11:51 AM EDT     1.53 feet High Tide
Thu -- 05:50 PM EDT     0.13 feet Low Tide
Thu -- 08:22 PM EDT     Sunset
Thu -- 11:47 PM EDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.61.310.70.40.20.20.40.711.31.51.51.41.10.70.40.20.10.20.50.91.21.5

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NOTE: This section has been updated as of 1/26/2021. If the image you are expecting is not showing, please let me know. You may use the EDIT function to update your location.
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