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Marine Weather and Tides
Version 3.4 |
6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen |
| Sunrise 5:57AM | Sunset 8:32PM | Friday July 19, 2019 6:41 PM EDT (22:41 UTC) | Moonrise 9:30PM | Moonset 7:23AM | Illumination 92% |  |
ANZ535 Tidal Potomac From Key Bridge To Indian Head- 436 Pm Edt Fri Jul 19 2019
Rest of this afternoon..SW winds 10 kt. Waves 1 ft.
Tonight..SW winds around 5 kt. Waves 1 ft.
Sat..SW winds around 5 kt. Waves 1 ft.
Sat night..W winds around 5 kt. Waves 1 ft.
Sun..W winds around 5 kt. Waves 1 ft.
Sun night..SW winds around 5 kt. Waves 1 ft. A chance of showers and tstms.
Mon..NW winds around 5 kt. Waves 1 ft. Showers likely. Tstms likely .
Tue..NW winds around 5 kt. Waves 1 ft. Showers likely. Winds and waves higher and visibilities lower in and near tstms.
Rest of this afternoon..SW winds 10 kt. Waves 1 ft.
Tonight..SW winds around 5 kt. Waves 1 ft.
Sat..SW winds around 5 kt. Waves 1 ft.
Sat night..W winds around 5 kt. Waves 1 ft.
Sun..W winds around 5 kt. Waves 1 ft.
Sun night..SW winds around 5 kt. Waves 1 ft. A chance of showers and tstms.
Mon..NW winds around 5 kt. Waves 1 ft. Showers likely. Tstms likely .
Tue..NW winds around 5 kt. Waves 1 ft. Showers likely. Winds and waves higher and visibilities lower in and near tstms.
ANZ500 436 Pm Edt Fri Jul 19 2019
Synopsis for the tidal potomac and md portion of the chesapeake bay.. High pressure will build over the southeastern states through the weekend. A cold front will approach the waters from the great lakes and pennsylvania Sunday night, then cross the waters early next week.
Synopsis for the tidal potomac and md portion of the chesapeake bay.. High pressure will build over the southeastern states through the weekend. A cold front will approach the waters from the great lakes and pennsylvania Sunday night, then cross the waters early next week.
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 definition| Fxus61 klwx 191932 afdlwx area forecast discussion national weather service baltimore md washington dc 332 pm edt Fri jul 19 2019 Synopsis High pressure will build over the southeastern united states through the weekend. A cold front will approach from the great lakes Sunday, then cross the region early next week. Near term until 6 am Saturday morning A ridge of high pressure remains across the southeastern conus. Temperatures heat index values aren't quite up to advertised headlined criteria... But its close. Don't want to send the wrong message by dropping warnings to advisories. A pop up thunderstorm still can't be ruled out due to terrain circulations between the allegheny front and blue ridge this afternoon, but the latest satellite imagery not impressive. Am still carrying slight chance pops to cover this risk, but its starting to look doubtful. Tonight will not offer much relief with lows in the middle 70s to lower 80s and very humid (heat indices remaining 80-90). Short term 6 am Saturday morning through Sunday night Dangerous heat will continue through the weekend. The heat is still expected to peak Saturday, with heat indices possibly approaching 115 in the i-95 corridor due to ambient air temperatures around 100 and dew points between 70 and 75. Confidence high enough to raise warnings and advisories for peak heating Saturday. Again, overnight temperatures and humidity will offer no relief, with lows in the lower to middle 80s (near all time record warm) in the major urban centers expected, and just barely below 80 even in outlying areas (dew points will be quite high as well, mid 70s to lower 80s overnight). A pop up storm once can't be ruled out due to terrain circulations Saturday, but forcing coverage look sparse. A bigger but still conditional concern would be for an organized thunderstorm complex to develop across pennsylvania or west virginia and drop southeast. Its unlikely, but non-zero. Heights fall Sunday as a cold front make an approach. Precip chances higher, and increase at night. The added clouds precip risk make temperature forecasts more uncertain. Have left the excessive heat watch for Sunday. Long term Monday through Friday A cold front will approach and move through the region Monday afternoon into Tuesday. There has been a lot variability with the model solutions for the Monday into Tuesday frontal passage. They have been speeding up the solution which would mean more of a flood threat for our region but the recent runs of the gfs have slowed the frontal boundary considerably bringing the boundary through Tuesday morning. This solution would mean Monday will have the ability to warm back up into the mid 90s which would mean more CAPE available for thunderstorms and showers to form. This would lead to higher threat for severe weather especially with CAPE values above 2500 and shear above 20 to 25 knots and forcing with the cold front approaching from the west. We will need to continue to track the model trends but their will be the potential for severe weather and flooding Monday into Tuesday. Temperatures could reach heat advisory criteria again as dew point temps will hover in the upper 60s to low 70s. There is the potential for precip to linger through Tuesday. A cooling trend will begin on Tuesday with temperatures during the day not expected to reach much over the upper 70s to mid 80s. High pressure will build back into region from the midwest on Wednesday and linger over our region through the end of next week. Cooler temperatures are forecast to build back into our region with day time highs running in the upper 70s to mid 80s depending on the model solution. Generally a much cooler and drier air mass is expected to finish next week. Aviation 19z Friday through Wednesday MainlyVFR and very hot and humid through the weekend. Patchy fog is possible for outlying terminals each night, but low confidence at this time. W flow AOB 10 kts. Showers and thunderstorms will be possible late Sunday or Sunday night into Tuesday, potentially provided local brief but significant flight restrictions. Marine Guidance suggesting that southerly channeling may become established this evening down the chesapeake bay, have issued a small craft advisory this evening into the overnight hours, which may need to be adjusted depending upon how this actually pans out. Otherwise, looking at hot humid conditions with light flow, becoming onshore late in the day. Thunderstorms may approach by late Sunday as a front nears. Hot and humid conditions will be possible again over the waters on Monday. A southerly flow up the bay may create winds strong enough to reach small craft advisory criteria. A cold front will move through the waters Monday afternoon into Tuesday which may lead to the need for small craft advisories into Tuesday. |
Climate The record daily warm low temperature for iad for july 18th is 74 degrees, set in 2005 and 1969. As a reference, here are the warm temperature records for Friday through this weekend: record daily high temperatures jul 19 jul 20 jul 21 dca 102 (1930) 106 (1930) 104 (1926) bwi 103 (1930) 102 (1930) 104 (1930) iad 98 (1977) 101 (1980) 101 (1991) record daily warm low temperatures jul 19 jul 20 jul 21 dca 81 (1930) 82 (2015) 82 (1987) bwi 80 (1942) 80 (1930) 83 (1930) iad 77 (2013) 75 (2015) 77 (1987) highest july temperatures highest MAX warmest low dca 106 (7 20 1930) 84 (7 24 2011, 7 23 2011, 7 16 1983) bwi 107 (7 10 1936) 83 (7 21 1930) iad 105 (7 22 2011) 78 (7 24 2010, 7 8 2010) all-time highest temperatures highest MAX warmest low dca 106 (7 20 1930, 8 6 1918) 84 (7 24 2011, 7 23 2011, 7 16 1983) bwi 107 (7 10 1936) 83 (8 5 1930, 7 21 1930, 6 6 1925) iad 105 (7 22 2011) 79 (8 8 2007) longest stretches of consecutive days with high temperatures at or over 100 degrees at iad: 2 (7 7-8 2012, 7 21-22 2011, 7 6-7 2010, 8 16-17 1997, 7 16-17 1988 and 7 20-21 1980) longest stretch of consecutive days with low temperatures at or over 80 degrees at dca: 5 (7 16-20 2013) longest stretch of consecutive days with low temperatures at or over 80 degrees at bwi: 4 (8 8-11 1900) temperature records for the washington dc area have been kept at what is now ronald reagan washington national airport (dca) since 1941. Additional temperature records observed downtown extend the period of record back to 1872. Temperature records for the baltimore md area have been kept at what is now baltimore-washington international thurgood marshall airport (bwi) since 1950. Additional temperature records observed downtown extend the period of record back to 1872. Temperature records for the sterling dulles va area have been kept at what is now washington dulles international airport (iad) since 1960. Lwx watches warnings advisories Dc... Excessive heat warning until 9 pm edt this evening for dcz001. Excessive heat warning from 11 am to 9 pm edt Saturday for dcz001. Excessive heat watch from Sunday morning through Sunday evening for dcz001. Md... Excessive heat warning until 9 pm edt this evening for mdz003>006-011-013-014-503>508. Excessive heat warning from 11 am to 9 pm edt Saturday for mdz003>006-011-013-014-016>018-503>508. Excessive heat watch from Sunday morning through Sunday evening for mdz003>006-011-013-014-016>018-503>508. Heat advisory until 9 pm edt this evening for mdz016>018-502. Heat advisory from 11 am to 9 pm edt Saturday for mdz502. Va... Excessive heat warning until 9 pm edt this evening for vaz028- 031-052>054-505-506. Excessive heat warning from 11 am to 9 pm edt Saturday for vaz028>031-036>040-050>057-501-502-505-506. Excessive heat watch from Sunday morning through Sunday evening for vaz028>031-036>040-050>057-501-502-505-506. Heat advisory until 9 pm edt this evening for vaz025>027-029- 030-036>040-050-051-055>057-501-502. Heat advisory from 11 am to 9 pm edt Saturday for vaz025>027. Wv... Excessive heat warning until 9 pm edt this evening for wvz051>053. Excessive heat warning from 11 am to 9 pm edt Saturday for wvz051>053. Excessive heat watch from Sunday morning through Sunday evening for wvz051>053. Heat advisory until 9 pm edt this evening for wvz050-055-502- 504. Heat advisory from 11 am to 9 pm edt Saturday for wvz050-055- 502-504. Marine... Small craft advisory from 8 pm this evening to 2 am edt Saturday for anz532>534-541-543. Synopsis... Hts near term... Hts short term... Hts long term... Jmg aviation... Hts jmg marine... Hts jmg climate... Dhof |
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 | 60 min | SW 5.1 G 9.9 | 95°F | 87°F | 1012.1 hPa | ||
| NCDV2 | 35 mi | 60 min | SW 5.1 G 8 | 95°F | 1011.6 hPa | |||
| APAM2 - 8575512 - Annapolis, MD | 44 mi | 54 min | 92°F | 1011.4 hPa | ||||
| 44063 - Annapolis | 45 mi | 36 min | S 9.7 G 12 | 87°F | 86°F | 1011.9 hPa | ||
| TPLM2 - Thomas Point, MD | 45 mi | 42 min | SSE 12 G 13 | 87°F | 85°F | 1012.7 hPa (-1.5) | 81°F | |
| 44062 - Gooses Reef, MD | 48 mi | 36 min | SSE 9.7 G 9.7 | 87°F | 1013 hPa | |||
| BLTM2 - 8574680 - Baltimore, MD | 49 mi | 60 min | Calm G 2.9 | 96°F | 83°F | 1011.3 hPa | ||
| CPVM2 | 49 mi | 54 min | 88°F | 85°F | ||||
| FSKM2 - 8574728 - Francis Scott Key Bridge, MD | 49 mi | 54 min | W 12 G 14 | 94°F | 1011.7 hPa | |||
| FSNM2 | 49 mi | 72 min | W 14 G 15 | 94°F | 1011.9 hPa |
Wind History for Washington, DC
(wind in knots) EDIT (on/off) Help| 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 | 12 PM | 1 PM | 2 PM | 3 PM | 4 PM | 5 PM | 6 PM | |
| Last 24hr | NW | NW | NW | -- | S | -- | S | S | S G7 | W | W | NW | NW | NW | NW | NW G12 | NW G10 | NW G10 | NW G11 | NW | S | S | SW | SW |
| 1 day ago | SE | S | SE | SE | S | -- | SW | W | SE | SE G6 | SW | SW | S | S | S | S | NW G12 | NW G6 | W | W G8 | NW G14 | NW G13 | NW G9 | |
| 2 days ago | S | S | S | S G16 | S | S G9 | SW | S | S | S | S | S | S G9 | S G8 | S | S | S | S | S | S G13 | S | S G14 | S G13 | SW G14 |
Airport Reports
EDIT (on/off) Help Click EDIT to display multiple airports| Airport | Dist | Age | Wind kt | Visibility | Sky/Weather | Temp | DewPt | Humidity | Pressure |
| Fort Belvoir, VA | 7 mi | 1.8 hrs | SSE 5 | 10.00 mi | Fair | 94°F | 75°F | 55% | 1013.1 hPa |
| Washington/Reagan National Airport, DC, VA | 13 mi | 50 min | SSW 11 | 10.00 mi | A Few Clouds | 95°F | 73°F | 49% | 1012 hPa |
| Manassas, Manassas Regional Airport/Harry P. Davis Field, VA | 14 mi | 46 min | SSW 6 | 10.00 mi | Fair | 95°F | 73°F | 49% | 1013.2 hPa |
| Washington/Dulles International Airport, DC, VA | 15 mi | 50 min | SSW 7 | 10.00 mi | A Few Clouds | 96°F | 68°F | 40% | 1012 hPa |
| Quantico Marine Corps Airfield - Turner Field, VA | 20 mi | 46 min | WSW 6 | 10.00 mi | Fair | 98°F | 71°F | 42% | 1012.4 hPa |
| Camp Springs / Andrews Air Force Base, MD | 21 mi | 1.8 hrs | SW 9 | 10.00 mi | Fair | 94°F | 71°F | 47% | 1013.2 hPa |
| College Park Airport, MD | 22 mi | 59 min | N 0 | 10.00 mi | Partly Cloudy | 95°F | 65°F | 38% | 1011.8 hPa |
Wind History from DAA (wind in knots)
| 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 | 12 PM | 1 PM | 2 PM | 3 PM | 4 PM | 5 PM | 6 PM | |
| Last 24hr | W | Calm | Calm | Calm | Calm | Calm | Calm | Calm | Calm | Calm | Calm | Calm | Calm | NW | W | NW | NW | NW | W | NW | S | S | S | SW |
| 1 day ago | SE | Calm | Calm | Calm | Calm | Calm | W | Calm | Calm | Calm | Calm | Calm | S | S | S | NW | W | NW | W | W | W | NW | W | |
| 2 days ago | SE | Calm | Calm | SE | S | Calm | Calm | Calm | SE | Calm | Calm | Calm | Calm | SW | S | S | S | S | SE | S | S | S | S | SE |
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 and Satellite Images
(on/off) HelpWeather Map
GOES 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 (18,4,5,8)
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Ground Weather Radar Station Sterling, VA
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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. |