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Marine Weather and Tides
Version 3.4 |
6/25/2017 - NOAA is having a major issue that impact the 7 day forecast load times. Many users are reporting problems. The issue has been reported. 5/23/2017 - Worked with NOAA again to speed up the 7 day forecast load times. Thanks to them for being responsive. 5/19/2016 - There were issues with the 3 day airport observation history. I switched to another data source. Let me know if you see any issues with the data feeds. |
| Sunrise 6:26AM | Sunset 7:54PM | Monday August 21, 2017 9:30 PM EDT (01:30 UTC) | Moonrise 5:09AM | Moonset 6:59PM | Illumination 0% |  |
Marine Forecasts
EDIT (on/off) Help| ANZ533 Chesapeake Bay From North Beach To Drum Point- 859 Pm Edt Mon Aug 21 2017 .small craft advisory in effect until 6 am edt Tuesday... .small craft advisory in effect from Tuesday afternoon through Tuesday evening... Tonight..S winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft. A slight chance of showers and tstms. Tue..S winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft. Tue night..SW winds 10 to 15 kt with gusts to 20 kt...becoming W 5 to 10 kt late. Waves 2 ft. Wed..NW winds 5 to 10 kt. Waves 1 ft. Wed night..N winds 5 to 10 kt. Waves 1 ft. Thu..N winds 5 to 10 kt. Waves 1 ft. Thu night..N winds 5 kt. Waves less than 1 ft. Fri..N winds 5 to 10 kt. Waves 1 to 2 ft. Sat..NE winds 5 to 10 kt. Waves 1 to 2 ft. Winds and waves higher and visibilities lower in and near tstms. | ANZ500 859 Pm Edt Mon Aug 21 2017 Synopsis for the tidal potomac and md portion of the chesapeake bay.. High pressure will remain offshore through tonight. A cold front will cross the waters late Tuesday night into early Wednesday. High pressure will return for the second half of the week. |
7 Day Forecast for Marine Location Near Baden, MD
Hourly EDIT Helplocation: 38.66, -76.68 debug
Area Discussion for - Baltimore, MD/Washington
(on/off) Help NOTE: mouseover dotted underlined text for definition| Fxus61 klwx 220115 afdlwx area forecast discussion national weather service baltimore md washington dc 915 pm edt Mon aug 21 2017 Synopsis High pressure will remain offshore tonight and a strong cold front will approach our area Tuesday before passing through Tuesday night into Wednesday. Showers and thunderstorms are possible ahead of this cold front. The front could stall to our southeast, while a second area of high pressure builds in from the west later this week. Near term until 6 am Tuesday morning Most of the convection from this afternoon and early evening has dissipated. However... Very humid conditions persist and a weak surface trough remains near the blue ridge mountains. Therefore... A popup shower or thunderstorm cannot be ruled out through late this evening. High pressure will remain offshore overnight. A southerly flow will continue to usher in warm and quite humid conditions. Min temperatures will range from the 60s in the potomac highlands to the mid and upper 70s in downtown washington and baltimore. Most places should turn out dry overnight as the nocturnal inversion strengthens. Patchy low clouds and fog are possible... Especially in sheltered valleys and areas that have received rainfall from thunderstorms earlier. Short term 6 am Tuesday morning through Wednesday night A very warm day on tap Tuesday with highs in the lower to mid 90s. Will have to keep an eye on dewpoints Tuesday... Because a heat advisory may be needed for portions of the area... Particularly along and east of the interstate 95 corridor. As of now... It appears that the low-level flow may go slightly west of south and this will cause winds to be better aligned with height... Increasing mixing. Therefore... Dewpoints may drop into the upper 60s and lower 70s. If this occurs... Then heat indices will be closer to 100 degrees. However... If not then dewpoints would hold in the middle 70s causing heat indices closer to 105 degrees. Will mention the possibility of heat in the hazardous weather outlook for now. A cold front will move into the ohio valley by Tuesday evening... Bringing a chance of thunderstorms to the western part of the forecast area late in the afternoon evening. Given the amount of CAPE that will be available severe weather is a possibility, especially west of the blue ridge. SREF has been consistent on weakening the storms after 00z Wednesday as these attempt to track east of the mountains - we'll have to see. The front is expected to move through the forecast area Tuesday night into Wednesday morning. This will bring a drop of about ten degrees to the region Wednesday, and the start of some very pleasant weather that will go into the weekend. Long term Thursday through Monday High pressure passing from the great lakes into new england will control the weather pattern over the mid-atlantic late this week through the weekend. Temperatures and humidity will be below normal, more reminiscent of late september than late august. Precipitation chances will be minimal during this time. Aviation 01z Tuesday through Saturday Vfr conditions are expected for most of the time through |
Tuesday. Patchy fog is possible early Tuesday morning. Do have a period of MVFR vsbys for the western terminals... But current thinking is that alight gradient wind will prevent dense fog from developing. Thunderstorms will again be possible Tuesday night. Mrb may be the most at risk. Vfr again Wednesday. MainlyVFR expected W light N flow as high pressure moves to the north thu-fri. Marine Southerly winds will channel up the bay and lower tidal potomac river tonight. A small craft advisory is in effect. There has been a lull in the gusty winds this evening... But wind gusts around 20 knots are expected overnight as the gradient strengthens. Another SCA is in effect Tuesday afternoon evening ahead of an approaching cold front. Generally light flow is expected over the waters late in the week as high pressure moves by to the north. Tides coastal flooding Tidal anomalies are around one half to three quarters of a foot above normal this evening. These anomalies should hold nearly steady through tonight with a southerly flow in place. The next high tide overnight into early Tuesday will be the higher of the two astronomical norms... And water levels will be close to minor flooding thresholds. A coastal flood advisory is in effect for anne arundel county where confidence is highest near annapolis. Elsewhere... Will have to watch straits point in st marys county... Baltimore and washington dc. Did not issue an advisory at this time since the surface flow may go just west of south. A south to southwest flow will persist through Tuesday and into Tuesday night. More minor flooding is possible near times of high tide Tuesday night. An offshore flow will develop behind a cold front Wednesday. Lwx watches warnings advisories Dc... None. Md... Coastal flood advisory from 4 am to 9 am edt Tuesday for mdz014. Va... None. Wv... None. Marine... Small craft advisory until 6 am edt Tuesday for anz531>534-537- 539>541-543. Small craft advisory from noon to 11 pm edt Tuesday for anz530>543. Synopsis... Bjl near term... Abw short term... Abw long term... Dfh aviation... Abw dfh marine... Abw dfh tides coastal flooding... Bjl |
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 |
| BSLM2 - Chesapeake Bay, MD | 8 mi | 120 min | WSW 1.9 | 76°F | 1020 hPa | 70°F | ||
| 44062 - Gooses Reef, MD | 16 mi | 30 min | SSW 7.8 G 9.7 | 81°F | 81°F | 1 ft | 1020.9 hPa (+0.4) | |
| TPLM2 - Thomas Point, MD | 21 mi | 30 min | SW 9.9 G 9.9 | 80°F | 81°F | |||
| WASD2 - 8594900 - Washington, DC | 23 mi | 42 min | S 2.9 G 5.1 | 80°F | 83°F | 1019.4 hPa | ||
| COVM2 - 8577018 - Cove Point LNG Pier, MD | 24 mi | 42 min | SSW 11 G 14 | 81°F | 1020.9 hPa | |||
| 44063 - Annapolis | 24 mi | 30 min | S 3.9 G 5.8 | 82°F | 1 ft | |||
| APAM2 - 8575512 - Annapolis, MD | 25 mi | 42 min | 79°F | 1019.6 hPa | ||||
| SLIM2 - 8577330 - Solomons Island, MD | 26 mi | 42 min | S 2.9 G 5.1 | 80°F | 83°F | |||
| CPVM2 | 28 mi | 42 min | 81°F | 78°F | ||||
| NCDV2 | 30 mi | 42 min | SW 13 G 18 | 77°F | 85°F | 1019.3 hPa | ||
| CA2 - 8571892 - Cambridge, MD | 33 mi | 42 min | 80°F | 83°F | 1021.3 hPa | |||
| PPTM2 - 8578240 - Piney Point, MD | 37 mi | 42 min | S 4.1 G 5.1 | |||||
| 44043 - Patapsco, MD | 37 mi | 30 min | SW 5.8 G 7.8 | 79°F | 82°F | 1020.2 hPa (-0.4) | ||
| FSKM2 - 8574728 - Francis Scott Key Bridge, MD | 39 mi | 42 min | S 5.1 G 7 | 76°F | 1019.7 hPa | |||
| BLTM2 - 8574680 - Baltimore, MD | 42 mi | 42 min | S 1.9 G 5.1 | 77°F | 84°F | 1019.4 hPa | ||
| TCBM2 - 8573364 - Tolchester Beach, MD | 45 mi | 42 min | SE 4.1 G 7 | 78°F | 82°F | 1020.3 hPa | ||
| BISM2 - 8571421 - Bishops Head, MD | 46 mi | 42 min | S 11 G 12 | 82°F | 84°F | 1020.5 hPa | ||
| 44042 - Potomac, MD | 47 mi | 30 min | S 9.7 G 12 | 82°F | 83°F | 1 ft | 1019.7 hPa (-0.0) | |
| LWTV2 - 8635750 - Lewisetta, VA | 47 mi | 42 min | SSW 6 G 7 | 81°F | 85°F | 1020.2 hPa |
Wind History for Washington, DC
(wind in knots) EDIT (on/off) Help| 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 | 12 PM | 1 PM | 2 PM | 3 PM | 4 PM | 5 PM | 6 PM | 7 PM | 8 PM | |
| Last 24hr | SE | SE | SE G7 | SE | SE | SE | SE | -- | SE | E | E | S | S | S | S | SW | S | S G10 | S | S G11 | S G19 | S G11 | S G17 | S G10 |
| 1 day ago | S | N G11 | N G5 | NW | W | NW | NW | NW | W | N G6 | NW | NW | NE G5 | NE G8 | N G6 | NW G6 | W | NW G8 | W G10 | NW G9 | NW | NW | W | NE |
| 2 days ago | S | S G7 | S | S | S G8 | SW | NW | NW | NW G9 | NW G8 | NW G9 | NW | NW G9 | NW | NW G9 | NW G11 | NW G8 | NW G9 | N G8 | NW | SW G6 | SW | S G10 | S |
Airport Reports
EDIT (on/off) Help Click EDIT to display multiple airports| Airport | Dist | Age | Wind kt | Visibility | Sky/Weather | Temp | DewPt | Humidity | Pressure |
| Camp Springs / Andrews Air Force Base, MD | 15 mi | 32 min | S 3 | 10.00 mi | Fair | 75°F | 69°F | 83% | 1020.4 hPa |
| Washington/Reagan National Airport, DC, VA | 23 mi | 38 min | SW 5 | 10.00 mi | Mostly Cloudy | 79°F | 72°F | 79% | 1020 hPa |
Wind History from ADW (wind in knots)
| 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 | 12 PM | 1 PM | 2 PM | 3 PM | 4 PM | 5 PM | 6 PM | 7 PM | 8 PM | 9 PM | |
| Last 24hr | Calm | Calm | Calm | Calm | Calm | Calm | SE | Calm | Calm | Calm | Calm | S | S | S | S | S | S | S | S | S | S | S | SW | S |
| 1 day ago | S | NW | SE | Calm | Calm | Calm | NW | Calm | N | N | N | N | N | N | N | N | Calm | NE | W | W | N | SE | E | S |
| 2 days ago | S | S | S | SW | SW | W | W | NW | NW | NW | NW | NW | W | N | N G14 | W | W | NW | NW | S | S | SW | SW | S |
Tide / Current Tables for Lower Marlboro, Patuxent River, Maryland
EDIT RT Ports Option Weekend mode (on/off) (on/off) Help One Week of Data| Lower Marlboro Click for Map Mon -- 04:04 AM EDT 2.16 feet High Tide Mon -- 06:08 AM EDT Moonrise Mon -- 06:26 AM EDT Sunrise Mon -- 10:29 AM EDT 0.08 feet Low Tide Mon -- 02:31 PM EDT New Moon Mon -- 04:25 PM EDT 2.03 feet High Tide Mon -- 07:52 PM EDT Sunset Mon -- 07:58 PM EDT Moonset Mon -- 10:47 PM EDT 0.02 feet Low Tide Tide / Current data from XTide NOT FOR NAVIGATION |
| 12am | 1am | 2am | 3am | 4am | 5am | 6am | 7am | 8am | 9am | 10am | 11am | 12pm | 1pm | 2pm | 3pm | 4pm | 5pm | 6pm | 7pm | 8pm | 9pm | 10pm | 11pm |
| 0.7 | 1.2 | 1.7 | 2 | 2.2 | 2 | 1.7 | 1.3 | 0.8 | 0.4 | 0.1 | 0.1 | 0.5 | 1 | 1.5 | 1.8 | 2 | 2 | 1.7 | 1.3 | 0.9 | 0.4 | 0.1 | 0 |
Tide / Current Tables for Broomes Island, 0.4 mile south of, Maryland Current
EDIT (on/off) Help One Week of Data| Broomes Island Click for MapFlood direction 290° true Ebb direction 110° true Mon -- 03:29 AM EDT -0.00 knots Slack Mon -- 06:08 AM EDT Moonrise Mon -- 06:26 AM EDT Sunrise Mon -- 06:41 AM EDT -0.65 knots Max Ebb Mon -- 10:05 AM EDT 0.00 knots Slack Mon -- 12:37 PM EDT 0.39 knots Max Flood Mon -- 02:31 PM EDT New Moon Mon -- 03:44 PM EDT -0.00 knots Slack Mon -- 06:45 PM EDT -0.51 knots Max Ebb Mon -- 07:51 PM EDT Sunset Mon -- 07:57 PM EDT Moonset Mon -- 09:38 PM EDT 0.00 knots Slack Tide / Current data from XTide NOT FOR NAVIGATION |
| 12am | 1am | 2am | 3am | 4am | 5am | 6am | 7am | 8am | 9am | 10am | 11am | 12pm | 1pm | 2pm | 3pm | 4pm | 5pm | 6pm | 7pm | 8pm | 9pm | 10pm | 11pm |
| 0.6 | 0.5 | 0.4 | 0.1 | -0.2 | -0.4 | -0.6 | -0.6 | -0.5 | -0.3 | -0 | 0.2 | 0.4 | 0.4 | 0.3 | 0.1 | -0.1 | -0.3 | -0.5 | -0.5 | -0.4 | -0.2 | 0.1 | 0.3 |
Weather Map and Satellite Images
(on/off) HelpWeather Map | IR Satellite Image from GEOS GOES Local Image of Mid-Atlantic EDIT  |
Wind Forecast for Baltimore, MD/Washington (21,6,7,8)
(on/off) Help |  |  |
Ground Weather Radar Station Dover AFB, DE
(on/off) Help
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Disclaimer: The information on this web site has not been checked for accuracy. It is for entertainment purposes only and should be independently verified before using for any other reason. There are five sources. 1) Documents and manuals from a variety of sources. These have not been checked for accuracy and in many cases have not even been read by anyone associated with L-36.com. I have no idea of they are useful or accurate, I leave that to the reader. 2) Articles others have written and submitted. If you have questions on these, please contact the author. 3) Articles that represent my personal opinions. These are intended to promote thought and for entertainment. These are not intended to be fact, they are my opinions. 4) Small programs that generate result presented on a web page. Like any computer program, these may and in some cases do have errors. Almost all of these also make simplifying assumptions so they are not totally accurate even if there are no errors. Please verify all results. 5) Weather information is from numerious of sources and is presented automatically. It is not checked for accuracy either by anyone at L-36.com or by the source which is typically the US Government. See the NOAA web site for their disclaimer. Finally, tide and current data on this site is from 2007 and 2008 data bases, which may contain even older data. Changes in harbors due to building or dredging change tides and currents and for that reason many of the locations presented are no longer supported by newer data bases. For example, there is very little tidal current data in newer data bases so current data is likely wrong to some extent. This data is NOT FOR NAVIGATION. See the XTide disclaimer for details. In addition, tide and current are influenced by storms, river flow, and other factors beyond the ability of any predictive program. |