Tuesday, July27, 2021
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Marine Weather and Tides
Forest Heights, MD

Version 3.4
NOTICE
3/30/2021 -- ANZ330 has been split into ANZ331 and ANZ332. Click EDIT in Marine Forecast and select your new zone.
1/26/2021 -- The West Coast Satellite images havd been updated. They now use GEOS-17.
1/1/2021 -- The 7 day forecast are now working well. Thank you NOAA for your support.

Sunrise 6:03AMSunset 8:25PM Tuesday July 27, 2021 2:04 AM EDT (06:04 UTC) Moonrise 9:58PMMoonset 8:44AM Illumination 91% Phase: Waning Gibbous; Moon at 18 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- 135 Am Edt Tue Jul 27 2021
Overnight..Light winds. Waves 1 ft.
Tue..NW winds around 5 kt. Waves 1 ft.
Tue night..S winds around 5 kt. Waves 1 ft.
Wed..NW winds around 5 kt. Waves 1 ft.
Wed night..SE winds around 5 kt. Waves 1 ft.
Thu..SW winds around 5 kt. Waves 1 ft. A chance of showers.
Thu night..W winds 5 kt. Waves less than 1 ft. A chance of showers.
Fri..N winds 5 to 10 kt. Waves 1 ft. A chance of showers in the morning.
Sat..NW winds 5 to 10 kt...becoming s. Waves 1 ft.
ANZ500 135 Am Edt Tue Jul 27 2021
Synopsis for the tidal potomac and md portion of the chesapeake bay.. A cold front will become stationary and eventually stall out over the carolinas through tonight as weak high pressure builds back into the region. A weak front will drop across the waters Wednesday before a more potent cold front sweeps through the area Thursday into Friday. Small craft advisories may be required for portions of the waters Thursday through Friday.


7 Day Forecast for Marine Location Near Forest Heights, MD
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location: 38.83, -77.03     debug


Area Discussion for - Baltimore, MD/Washington
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FXUS61 KLWX 270134 AAA AFDLWX

Area Forecast Discussion . UPDATED National Weather Service Baltimore MD/Washington DC 934 PM EDT Mon Jul 26 2021

SYNOPSIS. A weak cold front will stall out over central Virginia into southern Maryland through Tuesday. Another weak cold front will approach from the north Wednesday while an upper-level disturbance passes through. A stronger cold front will pass through late Thursday into early Friday and high pressure will build overhead for Saturday before moving offshore Sunday.

NEAR TERM /THROUGH TUESDAY/.

Two colliding outflow boundaries earlier this evening over central Maryland and northern Virginia resulted in a new line of thunderstorms that caused havoc in around the National Capital Region. These storms continue to move south and should exit the Fredericksburg area by 11 PM if not sooner. Radar trends indicate these storms are finally weakening. Once these storms exit the area in another hour or so, dry and tranquil conditions are epxected overnight. Some patchy fog is possible in areas that got the heaviest rains.

SHORT TERM /TUESDAY NIGHT THROUGH WEDNESDAY NIGHT/. High pressure will briefly build into our region on Tuesday with light winds continuing out of the north. An upper trough north of the Great Lakes is expected to drop south into PA. Shortwave energy along the southern parts of the trough may produce some isolated showers on Tuesday. I believe the threat remains relatively for showers on Tuesday especially with a continued northwesterly flow aloft advecting in drier air into the region. The combination of mostly clear skies along with a light flow will allow temps to rise up into the low to mid 90s on Tuesday. Typically as we get temps up into the mid 90s, the heat indices will become an issue but the lack of moisture advection will limit heat indexes to the 90s.

An upper level ridge will build over the central US Tuesday through Wednesday with a trough axis over the NE US. The positioning of the upper ridge will place our region in favorable location to allow for shortwaves to move over the ridge and drop down into our region. These shortwaves combined with a front approaching from the north may allow for showers and thunderstorms to form over the northern half of our CWA especially considering that temps will be hovering in the 90s. The main limiting factor for storm development will be the lack of good moisture in place on Wednesday. Afternoon temps be warm once again in the low to mid 90s. A marginal risk for SVR weather has been issued by SPC for areas along the MD/PA border for Wednesday due to the combination of shortwaves and a front slowly approaching from the north.

LONG TERM /THURSDAY THROUGH MONDAY/. An upper-level trough will strengthen over New England Thursday and Friday while the trough axis extends down through the Mid-Atlantic. A potent upper-level disturbance and jetmax associated with the trough will dig into New England during this time, and this will allow for a stronger cold front to approach Thursday before passing through Thursday night into Friday.

There will be some return flow ahead of the frontal passage which will allow for instability to develop. At the same time, moderate shear profiles are expected due to stronger northwest winds aloft associated with the upper-level trough and lower heights. Steep low- level lapse rates, increasing instability, stronger shear and forcing from the cold front suggests that thunderstorms are possible, and some storms may be severe. The best chance for severe appears to be Thursday afternoon and evening, but timing could shift depending on exactly when the cold front passes through.

The cold front will continue to push to the south for Friday into Friday night. However, the boundary could get hung up across our extreme southern zones for a period Friday, so a shower or thunderstorm is possible across those areas, but for most areas it will turn out less humid and dry.

High pressure will build overhead Friday night and Saturday, bringing dry and cooler conditions along with lower humidity. The high will move offshore for Sunday and warmer air will return.

AVIATION /02Z TUESDAY THROUGH SATURDAY/. Dry conditions are expected through Tue. A slight risk of thunderstorms Wednesday.

A cold front will pass through late Thursday into early Friday. A few thunderstorms are possible ahead of the boundary, especially Thursday afternoon and evening. Some storms may become severe, with damaging winds being the primary threat.

The boundary will push to the south for Friday, but it may get hung up close to KCHO. An isolated storm near KCHO is possible, but other areas should be dry with northwest winds.

MARINE.

A cold front will approach the waters Thursday before passing through Thursday night into Friday. Winds may approach SCA criteria ahead of the front late Thursday into Thursday night (from southerly winds), and again behind the front late Thursday night and Friday (from northwest winds).

A few thunderstorms are possible Thursday afternoon and evening, and some may produce gusty winds. An isolated t-storm near the extreme southern portion of the waters around Tangier Island cannot be completely ruled out Friday afternoon, but most places will be dry.

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

SYNOPSIS . LFR NEAR TERM . LFR SHORT TERM . JMG LONG TERM . BJL AVIATION . LFR MARINE . LFR


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
WASD2 - 8594900 - Washington, DC 3 mi155 min WNW 2.9 G 4.1 75°F 83°F1014.9 hPa
BSLM2 - Chesapeake Bay, MD 17 mi35 min Calm 69°F 1014 hPa68°F
APAM2 - 8575512 - Annapolis, MD 31 mi155 min Calm G 2.9 79°F 84°F1013.9 hPa
44063 - Annapolis 32 mi35 min WNW 7.8 G 9.7 76°F 82°F1015.1 hPa
TPLM2 - Thomas Point, MD 32 mi65 min W 6 G 7 77°F 80°F1015.4 hPa (+0.0)73°F
NCDV2 35 mi155 min NW 1 G 1 75°F 84°F1013.9 hPa
CPVM2 36 mi155 min 80°F 73°F
44062 - Gooses Reef, MD 38 mi41 min NNW 5.8 G 7.8 77°F 81°F1015.1 hPa
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 38 mi155 min WNW 5.1 G 6 79°F 1014.2 hPa
FSNM2 38 mi155 min W 4.1 G 6 78°F 1014.3 hPa
BLTM2 - 8574680 - Baltimore, MD 39 mi155 min NW 1 G 1.9 81°F 83°F1013.9 hPa
COVM2 - 8577018 - Cove Point LNG Pier, MD 45 mi155 min SW 6 G 9.9 81°F 1014.1 hPa
SLIM2 - 8577330 - Solomons Island, MD 47 mi155 min WSW 4.1 G 5.1 80°F 82°F1014.1 hPa
TCBM2 - 8573364 - Tolchester Beach, MD 49 mi155 min ESE 1 G 1.9 78°F 83°F1014.3 hPa

Wind History for Washington, DC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Washington/Reagan National Airport, DC, VA2 mi73 minN 010.00 miPartly Cloudy75°F69°F82%1014.8 hPa
Camp Springs / Andrews Air Force Base, MD8 mi69 minN 010.00 miFair72°F70°F94%1014.6 hPa
Fort Belvoir, VA11 mi69 minN 07.00 miFair71°F70°F97%1015.1 hPa
College Park Airport, MD12 mi70 minN 07.00 miFair71°F69°F93%1014.6 hPa
Fort Meade / Tipton, MD23 mi70 minN 03.00 miFair70°F70°F100%1015.6 hPa
Gaithersburg - Montgomery County Airport, MD24 mi69 minWNW 310.00 miFair71°F68°F90%1016.5 hPa
Washington/Dulles International Airport, DC, VA24 mi73 minN 010.00 miFair71°F69°F94%1014.8 hPa

Link to 5 minute data for KDCA

Wind History from DCA (wind in knots)
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Last 24hrSW6SW6S4S3S4S4CalmN8N5NE45E4N5Calm3E11SE10--S5W3W4CalmCalmCalm
1 day agoS12S13S11S7S8SW5S7SW10S10S11S11S9S12S9S8S12S8S9S7S8S6SW8SW7SW6
2 days agoSW3S3CalmSW3CalmCalmS5S8S6S8S8S8S10S12SE12
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Tide / Current Tables for Bellevue, D.C.
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Bellevue
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Tue -- 05:51 AM EDT     0.20 feet Low Tide
Tue -- 06:05 AM EDT     Sunrise
Tue -- 09:44 AM EDT     Moonset
Tue -- 11:31 AM EDT     3.39 feet High Tide
Tue -- 06:23 PM EDT     0.10 feet Low Tide
Tue -- 08:23 PM EDT     Sunset
Tue -- 10:58 PM EDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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3.12.61.91.30.80.40.20.51.32.333.33.32.92.31.610.50.10.20.81.72.53

Tide / Current Tables for Benning Bridge, D.C.
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Benning Bridge
Click for Map
Tue -- 06:04 AM EDT     Sunrise
Tue -- 06:05 AM EDT     0.21 feet Low Tide
Tue -- 09:44 AM EDT     Moonset
Tue -- 11:46 AM EDT     3.52 feet High Tide
Tue -- 06:37 PM EDT     0.11 feet Low Tide
Tue -- 08:23 PM EDT     Sunset
Tue -- 10:57 PM EDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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3.32.82.21.50.90.50.20.41.22.12.93.43.53.22.61.91.20.60.20.10.61.52.43

Weather Map
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NOTE: This section has been updated as of 1/26/2021. If the image you are expecting is not showing, please let me know. You may use the EDIT function to update your location.
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