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Marine Weather and Tides
Version 3.4 |
12/16/2019 NOAA is having trouble with requests that include wind gusts. I am posting graphs without wind gusts until it gets fixed. 10/9/2019 Updated the Marine Zones. 9/4/2019 Fixed the weather maps due to NOAA moving them. 7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports. |
| Sunrise 5:51AM | Sunset 8:37PM | Friday July 10, 2020 11:11 AM EDT (15:11 UTC) | Moonrise 11:15PM | Moonset 10:10AM | Illumination 74% |  |
ANZ535 Tidal Potomac From Key Bridge To Indian Head- 1037 Am Edt Fri Jul 10 2020
.small craft advisory in effect until 6 pm edt this evening...
Rest of today..N winds 10 kt. Waves 1 ft. Scattered showers.
Tonight..N winds 5 to 10 kt...becoming S in the late evening and overnight. Waves 1 ft. A chance of showers.
Sat..SW winds 5 to 10 kt. Waves 1 ft. A chance of showers.
Sat night..W winds 5 to 10 kt. Waves 1 ft.
Sun..SW winds 5 kt. Waves less than 1 ft.
Sun night..SW winds around 5 kt. Waves 1 ft. A chance of showers.
Mon..NW winds around 5 kt. Waves 1 ft. A chance of showers and tstms.
Tue..SW winds around 5 kt. Waves 1 ft. Winds and waves higher and visibilities lower in and near tstms.
.small craft advisory in effect until 6 pm edt this evening...
Rest of today..N winds 10 kt. Waves 1 ft. Scattered showers.
Tonight..N winds 5 to 10 kt...becoming S in the late evening and overnight. Waves 1 ft. A chance of showers.
Sat..SW winds 5 to 10 kt. Waves 1 ft. A chance of showers.
Sat night..W winds 5 to 10 kt. Waves 1 ft.
Sun..SW winds 5 kt. Waves less than 1 ft.
Sun night..SW winds around 5 kt. Waves 1 ft. A chance of showers.
Mon..NW winds around 5 kt. Waves 1 ft. A chance of showers and tstms.
Tue..SW winds around 5 kt. Waves 1 ft. Winds and waves higher and visibilities lower in and near tstms.
ANZ500 1037 Am Edt Fri Jul 10 2020
Synopsis for the tidal potomac and md portion of the chesapeake bay.. Tropical storm fay is expected to move northward into the new york city/new jersey/long island area and then into new england through tonight. A cold front will approach from the ohio river valley tonight into Saturday, then stall between interstate 95 and the coast through the weekend. High pressure is expected to build over the southeastern united states early next week. Sporadic gale force wind gusts are possible over portions of the waters this morning. Please consult the latest national hurricane center advisory for information on tropical storm fay.
Synopsis for the tidal potomac and md portion of the chesapeake bay.. Tropical storm fay is expected to move northward into the new york city/new jersey/long island area and then into new england through tonight. A cold front will approach from the ohio river valley tonight into Saturday, then stall between interstate 95 and the coast through the weekend. High pressure is expected to build over the southeastern united states early next week. Sporadic gale force wind gusts are possible over portions of the waters this morning. Please consult the latest national hurricane center advisory for information on tropical storm fay.
7 Day Forecast for Marine Location Near Kings Park, VA
Hourly EDIT Helplocation: 38.8, -77.27 debug
Area Discussion for - Baltimore, MD/Washington
(on/off) Help NOTE: mouseover dotted underlined text for definitionFXUS61 KLWX 101419 AFDLWX
Area Forecast Discussion National Weather Service Baltimore MD/Washington DC 1019 AM EDT Fri Jul 10 2020
SYNOPSIS. Tropical Storm Fay is expected to move northward into the New York City/New Jersey/Long Island area and then into New England through tonight. A cold front will approach from the Ohio River Valley tonight into Saturday, then stall between Interstate 95 and the coast through the weekend. High pressure building over the southeastern United States is expected to bring increasingly hot and humid weather for much of next week.
NEAR TERM /THROUGH TONIGHT/. As of 10am, Tropical Storm Fay was located about 100 mile east of the southern Delaware coast with a max sustained speed of 50 knots, moving to the north at 8 mph. Satellite imagery depicts a majority of the convection to the northeast of the center as Fay navigates along the Gulf Stream. The precipitation shield has crept into portions of Harford county and eastern Baltimore County. I expect rain to reach as far west as eastern Anne Arundel and central Baltimore County and city. Can't rule out some showers reaching eastern Carroll County this morning and early afternoon
Fay will move northward through tonight between the high pressure ridge over the western Atlantic and an approaching trough from the Great Lakes and Ohio Valley region. We will see rain chances increase east of the Blue Ridge this morning as the center of Fay passes just east of the Delmarva, and rain showers track westward from the Bay, with the highest rain chances remaining east of I-95. The latest deterministic Euro and ensemble guidance has shifted a bit further west with the QPF shield, highlighting a 50% chance of exceeding 1 inch across extreme northeastern MD and the eastern half of Harford County through this evening. With the bulk of other guidance a bit further east with the QPF shield, including the 00z CAMs, will advertise upwards of 0.75 to 1.00 inch across this portion of our CWA. Generally between a quarter to a half inch of rain is expected east of I-95 across the remaining portions of central and northeastern MD. As Fay begins to pull off to our northeast late this afternoon and evening, associated showers and isolated thunderstorms will tag along, allowing rain chances along the I-95 corridor to wane.
Further west, the aforementioned trough will be approach to our west late this afternoon and this evening, which will help spark scattered showers and thunderstorms along and just east of the Alleghenies. Timing of this activity is favoring more this evening and overnight, which would have a less diurnal flavor and ultimately lower intensity as the trough takes on a negative tilt. Activity will wane overnight with mostly dry conditions prevailing after midnight area wide.
Temperature wise today, the heat and humidity will continue. How quickly cloud cover from Fay is able to break to our north and east will determine how warm the metro areas get. Not out of the question that DC makes a run at 90 degrees late this afternoon as clouds begin to break. Elsewhere the 80s will hold on across central and northeast MD given increased cloud cover and rain chances, while upper 80s to middle 90s will be the norm south and west of the Blue Ridge Mountains. Mild tonight with temperatures holding in the middle 60s to middle 70s.
SHORT TERM /SATURDAY THROUGH SUNDAY NIGHT/. The upper trough and cutoff low will position itself over the eastern Great Lakes on Saturday as a ridge of surface high pressure builds over our area. While our CWA will remain underneath the broad upper trough, can't rule out afternoon showers and storms, but coverage has trended downward the last couple of days with the best lift residing to our north. Will carry the highest chance POPs over the mountains with the aid of terrain circulations, but a washout doesn't look likely given the latest guidance. Highs will be in the upper 80s to middle 90s, dropping back into 60s and lower 70s Saturday night with dry conditions.
Looks to be a better shot of showers and storms late Sunday afternoon and evening as another shortwave dips further south through the Ohio Valley and into our region, as the heat and humidity persists. Activity will diminish Sunday night with the loss of daytime heating, but will hold on to shower chances for at least the first half of the night.
LONG TERM /MONDAY THROUGH THURSDAY/. Upper level troughing will be positioned across the eastern CONUS on Monday. A surface front will likely be near or east of I-95, though it will be slow to move along with SW flow aloft. Showers and thunderstorms will be possible along and ahead of the front. The farther east it ends up by peak heating, the lower rain chances will be since drier air will arrive on westerly winds behind the front. There could be a chance of showers over the Appalachians as well depending on the position of the trough axis and if deep enough moisture can rotate down from the Great Lakes. Should see a slight downtick in temperatures behind the front, though they should remain close to normal.
Troughing will remain overhead on Tuesday, though at this time, the best forcing and moisture are projected to be north of the area. Therefore, convective coverage should be low. Temperatures will be similar to Monday . near or slightly above normal.
For the middle to end of next week, the trough will move off to the east, and upper level ridging and associated heat will expand eastward from the central/southern US. GFS/GEFS are on the slower side of the envelope in the progression of the warmer air aloft, so there's some uncertainty for temperatures on Wednesday. There's better agreement for high heat and humidity on Thursday, with heat indices over 100 possible. Thunderstorms chances remain minimal on Wednesday with little in the way of forcing and potential subsidence. By Thursday, there are hints amongst guidance that a subtle shortwave trough and/or surface boundary could be near the area, which would serve as a better focus for convective development.
AVIATION /14Z FRIDAY THROUGH TUESDAY/. MVFR CIGs expected at our eastern terminals this morning as Tropical Storm Fay passes just east of the Delmarva Peninsula, and north northeast winds average around 10 knots. Showers associated with Fay may deliver brief episodes of sub VFR VIS through the middle portion of the afternoon at BWI/MTN, less of a threat at IAD/DCA.
VFR conditions expected to prevail tonight and much of Saturday under a light westerly breeze. Shower and thunderstorm chances could deliver sub VFR conditions late Sunday at MRB/CHO, with less confidence of such an occurrence further east.
Light winds and VFR conditions will prevail Monday and Tuesday. Some thunderstorm potential may linger along the I-95 corridor Monday, with minimal chances on Tuesday.
MARINE. Solid SCA conditions expected across the waters today as Tropical Storm Fay passes just east of the Delmarva Peninsula. Can't rule out some sporadic gale gusts over the lower and middle portion of the Chesapeake Bay this morning as the gradient tightens. Elected to hold on to an SCA as confidence is low in gale gusts persisting longer than two hours. The gradient relaxes this evening as Fay pulls off to our northeast and northerly winds fall below SCA thresholds. A weak gradient will prevail this weekend under a light westerly flow, thus SCA conditions are not expected at this time.
A front will cross the waters Monday or Monday night. If the front is slow to progress east, thunderstorms will be possible Monday afternoon. West winds may be near SCA criteria behind the front, but confidence is low at this time. Light west winds will continue Tuesday with a minimal chance of showers/storms.
TIDES/COASTAL FLOODING. Tidal anomalies are running around one foot above normal as of early this morning. These anomalies should decrease through tonight due to northerly flow around the backside of Tropical Storm Fay as it departs toward New England. Once winds go light and then southerly this weekend, water levels should increase again. This will bring a renewed threat for minor tidal flooding at some sites.
LWX WATCHES/WARNINGS/ADVISORIES. DC . None. MD . None. VA . None. WV . None. MARINE . Small Craft Advisory until 6 PM EDT this evening for ANZ530>543.
SYNOPSIS . DHOF NEAR TERM . BKF/JMG SHORT TERM . BKF LONG TERM . ADS AVIATION . ADS/BKF/JMG MARINE . ADS/BKF TIDES/COASTAL FLOODING .
Weather Reporting Stations
EDIT (on/off) Help NOTE: Click on distance to see the station location on a map| Stations | Dist | Age | Wind | Air Temp | Water Temp | Waves | Pressure | DewPt |
| WASD2 - 8594900 - Washington, DC | 14 mi | 54 min | N 6 G 8.9 | 81°F | 84°F | 1011 hPa | ||
| BSLM2 - Chesapeake Bay, MD | 30 mi | 162 min | N 1.9 | 1010 hPa | ||||
| NCDV2 | 35 mi | 54 min | NNW 7 G 11 | 80°F | 85°F | 1009.8 hPa | ||
| APAM2 - 8575512 - Annapolis, MD | 44 mi | 54 min | N 8.9 G 14 | 78°F | 83°F | 1009.9 hPa | ||
| TPLM2 - Thomas Point, MD | 45 mi | 72 min | N 25 G 27 | 77°F | 81°F | 1010.2 hPa (-1.2) | 73°F | |
| 44062 - Gooses Reef, MD | 48 mi | 36 min | NNW 19 G 21 | 79°F | 81°F | |||
| BLTM2 - 8574680 - Baltimore, MD | 49 mi | 54 min | ENE 9.9 G 16 | 78°F | 85°F | 1010.5 hPa | ||
| CPVM2 | 49 mi | 54 min | 78°F | 74°F | ||||
| FSKM2 - 8574728 - Francis Scott Key Bridge, MD | 49 mi | 54 min | NNE 12 G 14 | 78°F | 1010.7 hPa | |||
| FSNM2 | 49 mi | 66 min | N 12 G 16 | 77°F | 1010.8 hPa |
Wind History for Washington, DC
(wind in knots) EDIT (on/off) Help| 11 AM | 12 PM | 1 PM | 2 PM | 3 PM | 4 PM | 5 PM | 6 PM | 7 PM | 8 PM | 9 PM | 10 PM | 11 PM | 12 AM | 1 AM | 2 AM | 3 AM | 4 AM | 5 AM | 6 AM | 7 AM | 8 AM | 9 AM | 10 AM | |
| Last 24hr | SE G7 | E G8 | E G10 | SE G8 | SE G9 | SE G9 | E G10 | E G12 | SE G10 | E G7 | SE G5 | E G6 | SE | NE G5 | E G6 | NE | NE | N G8 | N G6 | N G9 | NE G7 | N G7 | N G9 | N G12 |
| 1 day ago | S G8 | S | SW | S | SW | S G12 | S G10 | SE G13 | SE | S G7 | SE | SE | SE | SW G7 | S G8 | SE | -- | NE | -- | E | -- | NE | E G4 | SE G7 |
| 2 days ago | SE | -- | SW | NW G6 | SE | S | SE G9 | SE G11 | E G6 | E | SE G4 | S | SE | S | S G6 | SE G7 | S G8 | SE | SE | SE | S | SE | S | SE |
Airport Reports
EDIT (on/off) Help Click EDIT to display multiple airports. Follow links for more data.| Airport | Dist | Age | Wind kt | Visibility | Sky/Weather | Temp | DewPt | Humidity | Pressure |
| Fort Belvoir, VA | 7 mi | 76 min | NNW 8 | 10.00 mi | Mostly Cloudy | 83°F | 71°F | 68% | 1011.4 hPa |
| Washington/Reagan National Airport, DC, VA | 13 mi | 20 min | N 11 | 10.00 mi | Mostly Cloudy | 82°F | 72°F | 72% | 1011.1 hPa |
| Manassas, Manassas Regional Airport/Harry P. Davis Field, VA | 14 mi | 16 min | N 12 | 10.00 mi | A Few Clouds | 85°F | 72°F | 65% | 1011.9 hPa |
| Washington/Dulles International Airport, DC, VA | 15 mi | 20 min | NNW 9 | 10.00 mi | Mostly Cloudy | 82°F | 69°F | 65% | 1011.1 hPa |
| Quantico Marine Corps Airfield - Turner Field, VA | 20 mi | 16 min | N 7 | 10.00 mi | Mostly Cloudy | 87°F | 70°F | 57% | 1011 hPa |
| Camp Springs / Andrews Air Force Base, MD | 21 mi | 16 min | N 11 | 10.00 mi | Partly Cloudy | 80°F | 71°F | 75% | 1011.2 hPa |
| College Park Airport, MD | 22 mi | 37 min | NNW 6 | 10.00 mi | Overcast | 78°F | 68°F | 72% | 1010.8 hPa |
Link to 5 minute data for KDAA
Wind History from DAA (wind in knots)
| 12 PM | 1 PM | 2 PM | 3 PM | 4 PM | 5 PM | 6 PM | 7 PM | 8 PM | 9 PM | 10 PM | 11 PM | 12 AM | 1 AM | 2 AM | 3 AM | 4 AM | 5 AM | 6 AM | 7 AM | 8 AM | 9 AM | 10 AM | 11 AM | |
| Last 24hr | SE | Calm | E | E | SE | Calm | E | Calm | E | Calm | Calm | Calm | Calm | Calm | Calm | Calm | Calm | Calm | N | Calm | NW | NW | N | N |
| 1 day ago | SE | S | SE | SE | S | S | SE | SE | SE | Calm | Calm | Calm | Calm | Calm | Calm | Calm | Calm | Calm | Calm | Calm | Calm | Calm | Calm | NE |
| 2 days ago | Calm | E | SE | SE | SE | SE | S | SE | Calm | SE | SE | SE | S | Calm | Calm | S | Calm | Calm | Calm | Calm | SE | S | SE | S |
Tide / Current Tables for Marshall Hall, Potomac River, Maryland
EDIT Weekend mode (on/off) (on/off) Help One Week of DataTide / Current data from XTide NOT FOR NAVIGATION
Tide / Current Tables for Chain Bridge, one mile below, Washington, D.C.
EDIT (on/off) Help One Week of DataTide / Current data from XTide NOT FOR NAVIGATION
Weather Map
(on/off) Help Weather Map
GEOS Local Image of Mid-Atlantic EDIT
NOTE: East coast views moved to GEOS-16. They are experimental and not well supported by NOAA so they may not be correct so be warned. This change required redoing a large amount of the GOES code. If the image you are expecting is not showing, please let me know. You may need to use the EDIT function to update your location.
Link to Loop
Other links: Northern Pacific Contential US Full GOES-East
Wind Forecast for Baltimore, MD/Washington (11,2,3,4)
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Ground Weather Radar Station Sterling, VA
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