Tuesday, July14, 2020
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Marine Weather and Tides
Brookmont, MD

Version 3.4
NOTICE
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 5:53AMSunset 8:34PM Tuesday July 14, 2020 3:43 AM EDT (07:43 UTC) Moonrise 12:28AMMoonset 2:01PM Illumination 36% Phase: Waning Crescent; Moon at 24 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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ANZ535 Tidal Potomac From Key Bridge To Indian Head- 144 Am Edt Tue Jul 14 2020
Overnight..NW winds 5 kt. Waves less than 1 ft.
Tue..NW winds 5 kt. Waves less than 1 ft.
Tue night..NW winds around 5 kt. Waves 1 ft or less.
Wed..SE winds around 5 kt. Waves 1 ft.
Wed night..SE winds 5 kt. Waves less than 1 ft.
Thu..SE winds 5 to 10 kt. Waves 1 ft. A chance of showers.
Thu night..S winds 5 to 10 kt. Waves 1 ft. A chance of showers.
Fri..SW winds around 5 kt. Waves 1 ft. A chance of tstms. Showers likely .
Sat..SW winds around 5 kt. Waves 1 ft. A chance of tstms in the morning. Showers likely. Winds and waves higher and visibilities lower in and near tstms.
ANZ500 144 Am Edt Tue Jul 14 2020
Synopsis for the tidal potomac and md portion of the chesapeake bay.. A weak front along the atlantic seaboard will push offshore overnight. High pressure will then build across the area Tuesday and Wednesday before moving offshore. A front may approach from the north late in the week.


7 Day Forecast for Marine Location Near Brookmont, MD
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location: 38.92, -77.1     debug


Area Discussion for - Baltimore, MD/Washington
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FXUS61 KLWX 140108 AFDLWX

Area Forecast Discussion National Weather Service Baltimore MD/Washington DC 908 PM EDT Mon Jul 13 2020

SYNOPSIS. A weak front along the Atlantic seaboard will push offshore by tonight. High pressure will then build across the area Tuesday and Wednesday before moving offshore. A front may approach from the north late in the week.

NEAR TERM /UNTIL 6 AM TUESDAY MORNING/. A weak frontal boundary remains along the eastern seaboard this evening. Winds at DCA/IAD have switched around to the northeast, suggesting that the front is inland and oscillating. There have been a couple of showers/thunderstorms thus far, and they have not been directly associated with this boundary. They did send out an outflow, but this activity has predominately ceased with the loss of daylight given a capped 00Z IAD RAOB. A shower/sprinkle still possible in the southeastern section of the forecast area per CAMs, but will primarily step away from precip for the first period (ie: tonight). Temp forecast on track.

SHORT TERM /6 AM TUESDAY MORNING THROUGH WEDNESDAY NIGHT/. On Tuesday, high pressure will be centered over the eastern Great Lakes and will be moving NE into Tuesday night. Aloft, upper trough will be over New England with its axis just east of our area and pushing away from us into the night hours. Dry conditions expected generally under light northerly flow. Temperatures will reach into the upper 80s and low 90s, except at higher elevations. With dew points in the 50s and 60s. Low temperatures overnight will be in the 60s and 70s.

High pressure will be located over eastern Canada and remain there Wednesday into Wednesday night. Aloft, ridging will be building over our area. Winds will become easterly and then southerly late on Wednesday into Wednesday night with dry conditions over most of our area. With returning warm and moist air advection, a few isolated showers and/or thunderstorms could develop over higher terrain, near central VA, however with ridging aloft may inhibit any development.

LONG TERM /THURSDAY THROUGH MONDAY/. Ridge of high pressure continues to build over the deep south Thursday through the weekend. For our area though, we remain on the outer periphery of this upper-level ridge, which will lead to a somewhat active pattern across the region.

Thursday, an area of low pressure will track well to our north across the Great Lakes into the northeast. However, the cold front associated with this system will swing through Thursday night. Ahead of the front, a pre-frontal trough also moves across the region. With a warm and somewhat humid air mass in place, showers and storms are expected. Could be a couple different rounds, with the first coming in the afternoon with the pre-frontal trough, and the second coming with the front itself later Thursday evening into Thursday night. The frontal boundary is slow to push through the area on Friday, with an upper-level disturbance moving in out of the Ohio Valley as well. This will lead to additional showers and storms on Friday as well.

Multiple disturbances embedded within northwest flow Saturday and Sunday present continued chances for showers and storms through the weekend, primarily in the afternoon/evening. So, maintaining the chance POPs each of those days.

AVIATION /01Z TUESDAY THROUGH SATURDAY/. VFR flight conditions will prevail through Tuesday with scattered-broken clouds. Am keeping any overnight fog in the mountains and away from the terminals.

High pressure will be in control through Wednesday allowing for VFR conditions across the terminals. Winds will become easterly late Wednesday into Wednesday night which may enhance cloud cover.

Generally expect VFR conditions on Thursday across the region. However, showers and storms associated with an approaching cold front on Thursday into Thursday night may lead to restrictions at all terminals for a short period of time.

This front stalls over the region on Friday, with continued rain chances. Restrictions likely on Friday as a result, but will be heavily dependent on where the front stalls exactly.

MARINE. Light NW winds/Sub-SCA conditions will continue through Tuesday. High pressure will be in control through Wednesday allowing for sub- SCA conditions across the waters. A SCA may be needed for parts of the waters on Wednesday afternoon. Will continue to monitor.

Southerly channeling could approach SCA criteria late Thursday. Winds south around 10 knots Friday and Friday night. The chance of thunderstorms will increase each day.

LWX WATCHES/WARNINGS/ADVISORIES. DC . None. MD . None. VA . None. WV . None. MARINE . None.

SYNOPSIS . ADS NEAR TERM . HTS SHORT TERM . IMR LONG TERM . CJL AVIATION . IMR/HTS/CJL MARINE . IMR/CJL


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
WASD2 - 8594900 - Washington, DC 5 mi56 min 85°F1013.4 hPa
BSLM2 - Chesapeake Bay, MD 23 mi134 min S 2.9 1013 hPa
APAM2 - 8575512 - Annapolis, MD 33 mi56 min 83°F1012.6 hPa
TPLM2 - Thomas Point, MD 35 mi44 min WSW 5.1 G 6 75°F 81°F1014 hPa (+0.0)70°F
BLTM2 - 8574680 - Baltimore, MD 37 mi56 min 79°F1012.6 hPa
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 37 mi56 min 1012.9 hPa
FSNM2 37 mi74 min 1012.8 hPa
NCDV2 42 mi56 min 87°F1012.2 hPa
44062 - Gooses Reef, MD 44 mi38 min Calm G 0 77°F 82°F

Wind History for Washington, DC
(wind in knots)    EDIT      (on/off)   Help
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Washington/Reagan National Airport, DC, VA6 mi52 minSW 310.00 miPartly Cloudy73°F68°F84%1013.5 hPa
College Park Airport, MD10 mi69 minN 010.00 miFair69°F63°F84%1013.2 hPa
Camp Springs / Andrews Air Force Base, MD14 mi48 minN 010.00 miFair69°F67°F94%1013.6 hPa
Fort Belvoir, VA14 mi48 minN 08.00 miFair70°F68°F96%1013.4 hPa
Gaithersburg - Montgomery County Airport, MD17 mi48 minN 010.00 miOvercast69°F66°F90%1015.2 hPa
Washington/Dulles International Airport, DC, VA19 mi52 minN 010.00 miMostly Cloudy70°F64°F82%1013.4 hPa
Fort Meade / Tipton, MD21 mi49 minN 07.00 miPartly Cloudy64°F64°F100%1014.2 hPa

Link to 5 minute data for KDCA

Wind History from DCA (wind in knots)
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Last 24hrNW8NW5NW3NW5N6N7N5N8N8NE5343NW6N8N6NE9E6E3E3S4S4S4SW3
1 day agoSW5CalmS4S5S3S6SE4S8S10S10S9S9SE8SE7S9S8W11W4SW9SW7NW5NW5NW6NW8
2 days agoSW9W8W5SW6S6S7S6S4W10W7
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Tide / Current Tables for Chain Bridge, one mile below, Washington, D.C.
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Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.


Tide / Current Tables for Reagan National Airport, Washington, D.C.
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Reagan National Airport
Click for Map
Tue -- 01:27 AM EDT     Moonrise
Tue -- 03:59 AM EDT     3.20 feet High Tide
Tue -- 05:54 AM EDT     Sunrise
Tue -- 10:40 AM EDT     0.72 feet Low Tide
Tue -- 03:00 PM EDT     Moonset
Tue -- 04:28 PM EDT     2.80 feet High Tide
Tue -- 08:32 PM EDT     Sunset
Tue -- 10:19 PM EDT     0.51 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.42.12.73.13.232.621.410.80.711.62.22.62.82.72.41.81.20.70.50.6

Weather Map
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wmap_A
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 (3,6,7,8)
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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 numerous 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.