Marine Weather and Tide Forecast for George Mason, VA
April 23, 2025 4:33 AM EDT (08:33 UTC) Change Location
![]() | Sunrise 6:19 AM Sunset 7:55 PM Moonrise 3:04 AM Moonset 2:09 PM |
ANZ535 Tidal Potomac From Key Bridge To Indian Head- 134 Am Edt Wed Apr 23 2025
Overnight - N winds 5 kt. Waves less than 1 ft.
Wed - NE winds 5 kt. Waves less than 1 ft.
Wed night - S winds around 5 kt. Waves 1 ft or less.
Thu - S winds 5 to 10 kt. Waves 1 ft.
Thu night - SE winds 5 to 10 kt. Waves 1 ft.
Fri - S winds 5 to 10 kt. Waves 1 ft. A chance of showers.
Fri night - S winds 5 to 10 kt. Waves 1 ft. Showers likely.
Sat - W winds 5 to 10 kt - .becoming n. Waves 1 ft. Showers. A chance of showers after midnight.
Sun - NE winds 5 to 10 kt. Waves 1 ft. A chance of showers in the morning.
ANZ500 Synopsis For Flagler Beach To Jupiter Inlet Out To 60 Nm 335 Am Edt Wed Apr 23 2025
Synopsis - High pressure across the western atlantic retreats seaward today. Onshore flow persists becoming breezy to gusty each afternoon as the sea breeze develops. Dry and generally favorable boating conditions prevail.
Gulf stream hazards - None.
the approximate location of the west wall of the gulf stream based on the real time ocean forecast system as of Monday, april 21st, 2025.
45 nautical miles east of ponce inlet. 34 nautical miles east of port canaveral. 25 nautical miles east of sebastian inlet. 14 nautical miles east of fort pierce inlet. 8 nautical miles east of saint lucie inlet.
the approximate location of the west wall of the gulf stream based on the real time ocean forecast system as of Monday, april 21st, 2025.
45 nautical miles east of ponce inlet. 34 nautical miles east of port canaveral. 25 nautical miles east of sebastian inlet. 14 nautical miles east of fort pierce inlet. 8 nautical miles east of saint lucie inlet.
7 Day Forecast for Marine Location Near George Mason, VA

NEW! Add second zone forecast
Chain Bridge Click for Map Wed -- 04:03 AM EDT Moonrise Wed -- 05:13 AM EDT 3.07 feet High Tide Wed -- 06:20 AM EDT Sunrise Wed -- 11:48 AM EDT 0.53 feet Low Tide Wed -- 03:08 PM EDT Moonset Wed -- 05:34 PM EDT 3.10 feet High Tide Wed -- 07:53 PM EDT Sunset Tide / Current data from XTide NOT FOR NAVIGATION |   |
Chain Bridge, D.C., Tide feet
12 am |
0.6 |
1 am |
0.9 |
2 am |
1.6 |
3 am |
2.4 |
4 am |
2.9 |
5 am |
3.1 |
6 am |
3 |
7 am |
2.6 |
8 am |
2 |
9 am |
1.4 |
10 am |
0.9 |
11 am |
0.6 |
12 pm |
0.5 |
1 pm |
0.7 |
2 pm |
1.3 |
3 pm |
2.1 |
4 pm |
2.7 |
5 pm |
3.1 |
6 pm |
3.1 |
7 pm |
2.8 |
8 pm |
2.2 |
9 pm |
1.6 |
10 pm |
1 |
11 pm |
0.6 |
Tide / Current data from XTide NOT FOR NAVIGATION |   |
Chain Bridge, Washington, D.C., Tide feet
Area Discussion for Baltimore, MD/Washington
Hide  HelpNOTE: mouseover dotted underlined text for definition
FXUS61 KLWX 230601 AFDLWX
Area Forecast Discussion National Weather Service Baltimore MD/Washington DC 201 AM EDT Wed Apr 23 2025
SYNOPSIS
High pressure will build in from the north today into Thursday.
As a low pressure system approaches from the west, a warm front will lift through on Friday, followed by a cold front on Saturday. Canadian high pressure settles in on Sunday into early next week.
SHORT TERM /THROUGH FRIDAY/
Latest satellite imagery shows a slew of cirrus clouds spanning much of the Mid-Atlantic. A very dry airmass resides over the region as subsidence continues to dominate on the north side of an area of low pressure slowly moving offshore the VA/NC border.
The dry airmass is reflected in latest ACARS as well as sfc Td obs (upper 30s to low 40s). Clouds should thin through the day today as the cold front associated with aforementioned area of low pressure sags further south and high pressure builds in from the north.
Thu will feature more sun with only patchy high clouds expected with continued dry wx. Today & Thu will be very similar temperature wise, with highs in the low to mid 70s today, and a couple degrees warmer Thu. Lows will be in the upper 40s to mid 50s both nights. RH values will fall into the 30% range each afternoon, but the lack of wind and increasing green- up should prevent any widespread fire weather concerns.
As low pressure moves toward the upper Great Lakes Thu night, the frontal zone to the south and west will begin lifting north as a warm front. While clouds may start to increase, any rain will likely hold off until Fri afternoon/evening. However, not looking at any widespread rain until the cold front moves through Sat.
LONG TERM /SATURDAY THROUGH TUESDAY/
Sharp cold front associated with a southern Ontario and northern New England upper low will cross the area around 18Z Sat with showers and possible t-storms impacting the fcst area during the morning into early afternoon. High pressure builds over the area Sat night through Monday morning supporting cooler temperatures and fair weather conditions. High pressure will move offshore Monday afternoon with srly flow developing and returning moisture into the area. Another cold front will cross the area during the middle of next week bringing the next chance of showers for Wed night and Thu of next week.
AVIATION /05Z WEDNESDAY THROUGH SUNDAY/
VFR conditions are likely through Thu as high pressure builds nearby. Calm winds through daybreak become light out of the E/NE today, before becoming more SE'ly Thu. As a warm front approaches, overrunning moisture could result in some sub- VFR ceilings by late Thu night into Fri. Any restrictions associated with rain showers likely wait til late Fri.
Sub-VFR conditions likely continue into Sat as a cold front approaches and moves through the terminals. Southerly winds ahead of the front shift to west/northwesterly in the wake of the frontal passage. Showers and thunderstorms are possible Sat. VFR conditions return Sun.
MARINE
Monitoring the potential for northerly channeling down the bay in the predawn as low pressure moves off the coast. May best be handled with an MWS if it materializes given anticipated short duration.
Otherwise, high pressure will build across the area today and Thu, resulting in light winds. NE to E winds Wed will become SE by Thu.
SCA criteria winds are possible on Fri due to southerly channeling ahead of a cold front. Showers and thunderstorms impact the waters Fri and Sat with winds shifting to northwesterly in the wake of the front. Small Craft Advisories are likely on Sat.
LWX WATCHES/WARNINGS/ADVISORIES
DC...None.
MD...None.
VA...None.
WV...None.
MARINE...None.
Area Forecast Discussion National Weather Service Baltimore MD/Washington DC 201 AM EDT Wed Apr 23 2025
SYNOPSIS
High pressure will build in from the north today into Thursday.
As a low pressure system approaches from the west, a warm front will lift through on Friday, followed by a cold front on Saturday. Canadian high pressure settles in on Sunday into early next week.
SHORT TERM /THROUGH FRIDAY/
Latest satellite imagery shows a slew of cirrus clouds spanning much of the Mid-Atlantic. A very dry airmass resides over the region as subsidence continues to dominate on the north side of an area of low pressure slowly moving offshore the VA/NC border.
The dry airmass is reflected in latest ACARS as well as sfc Td obs (upper 30s to low 40s). Clouds should thin through the day today as the cold front associated with aforementioned area of low pressure sags further south and high pressure builds in from the north.
Thu will feature more sun with only patchy high clouds expected with continued dry wx. Today & Thu will be very similar temperature wise, with highs in the low to mid 70s today, and a couple degrees warmer Thu. Lows will be in the upper 40s to mid 50s both nights. RH values will fall into the 30% range each afternoon, but the lack of wind and increasing green- up should prevent any widespread fire weather concerns.
As low pressure moves toward the upper Great Lakes Thu night, the frontal zone to the south and west will begin lifting north as a warm front. While clouds may start to increase, any rain will likely hold off until Fri afternoon/evening. However, not looking at any widespread rain until the cold front moves through Sat.
LONG TERM /SATURDAY THROUGH TUESDAY/
Sharp cold front associated with a southern Ontario and northern New England upper low will cross the area around 18Z Sat with showers and possible t-storms impacting the fcst area during the morning into early afternoon. High pressure builds over the area Sat night through Monday morning supporting cooler temperatures and fair weather conditions. High pressure will move offshore Monday afternoon with srly flow developing and returning moisture into the area. Another cold front will cross the area during the middle of next week bringing the next chance of showers for Wed night and Thu of next week.
AVIATION /05Z WEDNESDAY THROUGH SUNDAY/
VFR conditions are likely through Thu as high pressure builds nearby. Calm winds through daybreak become light out of the E/NE today, before becoming more SE'ly Thu. As a warm front approaches, overrunning moisture could result in some sub- VFR ceilings by late Thu night into Fri. Any restrictions associated with rain showers likely wait til late Fri.
Sub-VFR conditions likely continue into Sat as a cold front approaches and moves through the terminals. Southerly winds ahead of the front shift to west/northwesterly in the wake of the frontal passage. Showers and thunderstorms are possible Sat. VFR conditions return Sun.
MARINE
Monitoring the potential for northerly channeling down the bay in the predawn as low pressure moves off the coast. May best be handled with an MWS if it materializes given anticipated short duration.
Otherwise, high pressure will build across the area today and Thu, resulting in light winds. NE to E winds Wed will become SE by Thu.
SCA criteria winds are possible on Fri due to southerly channeling ahead of a cold front. Showers and thunderstorms impact the waters Fri and Sat with winds shifting to northwesterly in the wake of the front. Small Craft Advisories are likely on Sat.
LWX WATCHES/WARNINGS/ADVISORIES
DC...None.
MD...None.
VA...None.
WV...None.
MARINE...None.
Stations | Dist | Age | Wind | Air | Water | Waves | inHg | DewPt |
WASD2 - 8594900 - Washington, DC | 15 mi | 46 min | NW 1.9G | 63°F | 30.14 | |||
BSLM2 - Chesapeake Bay, MD | 32 mi | 64 min | 0 | 57°F | 30.09 | 48°F | ||
NCDV2 | 39 mi | 46 min | 0G | 65°F | 30.10 | |||
APAM2 - 8575512 - Annapolis, MD | 45 mi | 46 min | WNW 5.1G | 30.11 | ||||
44063 - Annapolis | 46 mi | 34 min | NW 7.8G | 58°F | 60°F | 0 ft | ||
TPLM2 - Thomas Point, MD | 46 mi | 34 min | NW 8G | 62°F | 30.15 | |||
BLTM2 - 8574680 - Baltimore, MD | 48 mi | 46 min | SSW 1.9G | 59°F | ||||
FSKM2 - 8574728 - Francis Scott Key Bridge, MD | 49 mi | 46 min | WNW 6G | 30.13 |
Wind History for Washington, DC
toggle option: (graph/table)
Airport Reports
Airport | Dist | Age | Wind kt | Vis | Sky | Weather | Air | DewPt | RH | inHg |
KDAA DAVISON AAF,VA | 11 sm | 38 min | calm | 10 sm | Clear | 54°F | 45°F | 71% | 30.11 | |
KIAD WASHINGTON DULLES INTL,VA | 11 sm | 41 min | calm | 10 sm | Clear | 50°F | 39°F | 66% | 30.14 | |
KDCA RONALD REAGAN WASHINGTON NATIONAL,VA | 14 sm | 41 min | NNW 06 | 10 sm | Partly Cloudy | 59°F | 43°F | 55% | 30.13 | |
KHEF MANASSAS RGNL/HARRY P DAVIS FIELD,VA | 14 sm | 37 min | NNE 03 | 9 sm | Clear | 57°F | 41°F | 55% | 30.15 | |
KCGS COLLEGE PARK,MD | 22 sm | 18 min | calm | 10 sm | Clear | 50°F | 45°F | 82% | 30.15 | |
KJYO LEESBURG EXECUTIVE,VA | 22 sm | 18 min | no data | 10 sm | Clear | 52°F | 45°F | 76% | 30.17 | |
KADW JOINT BASE ANDREWS,MD | 23 sm | 38 min | NNW 04 | 10 sm | Clear | 57°F | 41°F | 55% | 30.11 | |
KNYG QUANTICO MCAF /TURNER FIELD,VA | 23 sm | 37 min | NNW 07 | 9 sm | Mostly Cloudy | 63°F | 41°F | 45% | 30.14 | |
KGAI MONTGOMERY COUNTY AIRPARK,MD | 24 sm | 37 min | calm | 10 sm | Clear | 48°F | 45°F | 87% | 30.15 |
Link to 1 hour of 5 minute data for KDAA
Terminal Aerodrome Forecast (TAF) for KDAA
Wind History Graph: DAA
(wind in knots)GEOS Local Image of Mid-Atlantic
Edit Hide
Sterling, VA,

NOTICE: Some pages have affiliate links to Amazon. As an Amazon Associate, I earn from qualifying purchases. Please read website Cookie, Privacy, and Disclamers by clicking HERE. To contact me click HERE. For my YouTube page click HERE