Sunday, July5, 2020
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Marine Weather and Tides
Forest Heights, 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 5:47AMSunset 8:37PM Sunday July 5, 2020 4:21 PM EDT (20:21 UTC) Moonrise 8:23PMMoonset 5:01AM Illumination 100% Phase: Full Moon; Moon at 15 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- 214 Pm Edt Sun Jul 5 2020
This afternoon..S winds 5 kt. Waves less than 1 ft. Showers and tstms likely.
Tonight..S winds around 5 kt. Waves 1 ft.
Mon..S winds 5 to 10 kt. Waves 1 ft. A chance of showers and tstms.
Mon night..S winds 5 to 10 kt. Waves 1 ft. A chance of showers and tstms.
Tue..S winds around 5 kt. Waves 1 ft. A chance of showers and tstms.
Tue night..S winds around 5 kt. Waves 1 ft.
Wed..SE winds around 5 kt. Waves 1 ft. A chance of showers and tstms through the night.
Thu..NE winds around 5 kt. Waves 1 ft. A chance of showers. Winds and waves higher and visibilities lower in and near tstms.
ANZ500 214 Pm Edt Sun Jul 5 2020
Synopsis for the tidal potomac and md portion of the chesapeake bay.. High pressure over the atlantic will control the weather pattern through Tuesday. Low pressure will develop to the south Wednesday and it may impact the waters late in the week.


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 051841 AFDLWX

Area Forecast Discussion National Weather Service Baltimore MD/Washington DC 241 PM EDT Sun Jul 5 2020

SYNOPSIS. Surface high pressure continues to build over the Atlantic through Tuesday. Meanwhile, upper-level ridging builds in across the area as well. Cutoff low pressure will develop to the south for Wednesday and it may impact the area late in the week.

NEAR TERM /THROUGH TONIGHT/. Current temperatures are not quite as warm as had been expected for much of the area, but still in the upper 80s to low 90s. Expect to add a degree or two to that for the highs today. Dew points are in the low to mid 70s for most of the area, keeping heat indices generally in the mid-upper 90s and even near 100 in a few spots. As a result of this very warm and humid airmass, starting to see several thunderstorms pop up across the area. The environment is characterized by 2500-3500 J/kg of MLCAPE, upwards of 1300 J/kg of DCAPE, but very little in terms of shear overall, with only 20-25 knots over northeast MD, decreasing further south and west. Coverage of storms has been best over central VA thus far, coming off of the higher terrain. However, we are beginning to see storms fire off of the river/bay breezes in central and northeast MD. Storms are expected to continue into this evening. SPC has put much of the area under a marginal risk for severe weather this afternoon. Given the DCAPE present across the region, any storm that really gets going is bringing down some wind. The lack of shear should allow for a more pulse-type storm environment, rather than longer lived multicells. However, in a similar environment yesterday, there was one storm that proved that theory wrong, so can't rule out an isolated more organized cell somewhere. Storms have generally been slow-moving thus far, but flooding isn't expected to be much of an issue given the lack of any well defined surface boundaries, and the presence of mid-level dry air, which should facilitate strong cold pool production and resultant propagation of storms.

Storms should quickly die off this evening as we lose daytime heating. Areas of patchy fog may be possible, especially to the west of the Blue Ridge, where winds are more likely to go calm within sheltered valleys. Lows tonight will range from the mid 60s in the mountains to the mid-upper 70s in the urban areas.

SHORT TERM /MONDAY THROUGH TUESDAY NIGHT/. With surface high pressure remaining in place over the Atlantic, and upper-level ridging building in overhead, expect much of the same on Monday and Tuesday. High temperatures will reach into the low-mid 90s, with continued high humidity leading to heat indices in the mid-upper 90s each afternoon. In fact, lows Monday and Tuesday night only get down into the low 70s for most areas (upper 60s in higher terrain and mid 70s in DC/Baltimore).

On Monday, things get a little more interesting. A weak upper- level shortwave will pass overhead in this very unstable environment. While weak, this shortwave will provide a little bit more shear than we have had in recent days. Given the combination of 20-25 knots of deep layer shear and high instability (2000 J/kg or so), should see some more intense and organized multicell clusters. For that reason SPC has place much of the forecast area under a marginal risk for severe weather on Monday. Damaging winds would be the primary risk with any storms, but some hail cannot be ruled out as well.

LONG TERM /WEDNESDAY THROUGH SATURDAY/. A warm and potentially fairly stormy pattern exists through the long term. To start, on Wednesday a weak upper low be near or just south of the region. This low lingers Thursday. The location of this low will help dictate how stormy the weather is, with a closer locale likely resulting in more afternoon thunderstorms and slightly cooler temperatures. Friday and Saturday, uncertainty grows, with some guidance kicking the upper low east ahead of a stronger trough approaching from the west, while others keep the low around. This will significantly affect the forecast, but uncertainty is high. Bottom line, however, is that slightly warmer than normal temperatures are likely, but the extent of thunderstorms is a more uncertain.

AVIATION /18Z SUNDAY THROUGH FRIDAY/. Generally expecting VFR at all terminals through Tuesday. However, there will be a chance for afternoon showers and storms each day, given the hot and humid air mass we are stuck in. This threat will generally end once the sun sets each evening.

Most of the activity thus far this afternoon has been near CHO, but will continue to keep TSRA in DCA/BWI between 20-22z, with greatest confidence in a storm hitting one of the terminals. VCTS remains for IAD and MTN as well, but think they may just get by without a direct hit this afternoon. Will continue to monitor radar and update as needed.

Main concern Wednesday and Thursday will be potential for early morning fog and afternoon thunderstorms. Both of these concerns are most likely to affect CHO and MRB.

MARINE. Light southerly winds (below SCA) are expected over the waters through Tuesday. Isolated to scattered showers and thunderstorms are expected each afternoon today through Tuesday. Special Marine Warnings may be needed for any stronger storms that form.

Mainly light winds on the waters Wednesday and Thursday, with the primary hazard being potential for afternoon thunderstorms both days.

TIDES/COASTAL FLOODING. Southerly flow continues over the next several days, which will help to keep anomalies generally elevated. Could see minor coastal flooding in many of the same spots this evening/tonight yet again. For now though, am holding off, as subtle shifts in the wind speed/direction could lead to quick drops in the anomalies, which could quickly bump the forecast back down. So, will hold off on any advisories at this time.

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

SYNOPSIS . CJL NEAR TERM . CJL SHORT TERM . CJL LONG TERM . RCM AVIATION . RCM/CJL MARINE . RCM/CJL TIDES/COASTAL FLOODING . CJL


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
WASD2 - 8594900 - Washington, DC 3 mi52 min SSW 6 G 8 89°F 87°F1013.8 hPa
BSLM2 - Chesapeake Bay, MD 17 mi112 min S 5.1 1014 hPa
APAM2 - 8575512 - Annapolis, MD 31 mi52 min S 4.1 G 8.9 90°F 83°F1013.5 hPa
TPLM2 - Thomas Point, MD 32 mi22 min SE 15 G 17 83°F 81°F1014.7 hPa (-1.8)76°F
NCDV2 35 mi52 min SSW 5.1 G 6 89°F 85°F1013.7 hPa
CPVM2 36 mi52 min 83°F 75°F
44062 - Gooses Reef, MD 38 mi34 min S 12 G 14 83°F 82°F
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 38 mi52 min SW 7 G 8.9 89°F 1013.4 hPa
FSNM2 38 mi64 min SSW 7 G 9.9 89°F 1013.5 hPa
BLTM2 - 8574680 - Baltimore, MD 39 mi52 min WSW 6 G 9.9 91°F 80°F1013 hPa
COVM2 - 8577018 - Cove Point LNG Pier, MD 45 mi190 min SSE 11 G 12
SLIM2 - 8577330 - Solomons Island, MD 47 mi52 min SSW 8.9 G 9.9 86°F 82°F1014.8 hPa
TCBM2 - 8573364 - Tolchester Beach, MD 49 mi52 min SSW 8 G 11 87°F 84°F1014.5 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 mi30 minS 1010.00 miPartly Cloudy93°F73°F52%1013.7 hPa
Camp Springs / Andrews Air Force Base, MD8 mi86 minS 310.00 miFair90°F72°F57%1015 hPa
Fort Belvoir, VA11 mi86 minSE 910.00 miPartly Cloudy92°F73°F56%1014.4 hPa
College Park Airport, MD12 mi27 minSE 610.00 miPartly Cloudy88°F64°F45%1013.5 hPa
Fort Meade / Tipton, MD23 mi27 minS 810.00 mi88°F71°F59%1014.2 hPa
Gaithersburg - Montgomery County Airport, MD24 mi26 minVar 410.00 miMostly Cloudy90°F71°F54%1015.2 hPa
Washington/Dulles International Airport, DC, VA24 mi30 minSE 710.00 miMostly Cloudy92°F70°F49%1013.3 hPa

Link to 5 minute data for KDCA

Wind History from DCA (wind in knots)
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Last 24hrE9E7SE5SE7S4S4SE3S4S8S10S9S9S10S7S5S6S8S9S9S10S9S10S11S10
1 day agoNW4NW11NW10NW7W4W5W7N10N3NW5N7N5N6N5N7N8NE8NE9NE6E7N5E4E3SE7
2 days agoN8N7N6NW6NW5W4SW3CalmS4SW3CalmSW3NW3N5N5N7NW8NW9N96N7NE33NW12

Tide / Current Tables for Bellevue, D.C.
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Bellevue
Click for Map
Sun -- 12:44 AM EDT     Full Moon
Sun -- 03:13 AM EDT     0.20 feet Low Tide
Sun -- 05:49 AM EDT     Sunrise
Sun -- 06:00 AM EDT     Moonset
Sun -- 08:58 AM EDT     3.64 feet High Tide
Sun -- 04:07 PM EDT     -0.01 feet Low Tide
Sun -- 08:36 PM EDT     Sunset
Sun -- 09:22 PM EDT     Moonrise
Sun -- 09:35 PM EDT     3.08 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.40.90.50.20.3122.93.43.63.42.82.11.50.90.3-00.211.82.6332.6

Tide / Current Tables for Benning Bridge, D.C.
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Benning Bridge
Click for Map
Sun -- 12:44 AM EDT     Full Moon
Sun -- 03:27 AM EDT     0.21 feet Low Tide
Sun -- 05:48 AM EDT     Sunrise
Sun -- 06:00 AM EDT     Moonset
Sun -- 09:13 AM EDT     3.78 feet High Tide
Sun -- 04:21 PM EDT     -0.01 feet Low Tide
Sun -- 08:36 PM EDT     Sunset
Sun -- 09:22 PM EDT     Moonrise
Sun -- 09:50 PM EDT     3.20 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.610.60.30.30.81.82.83.53.83.63.12.41.71.10.500.10.81.72.533.22.9

Weather Map
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wmap_A
GEOS Local Image of    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.
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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Baltimore, MD/Washington (16,3,4,5)
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Ground Weather Radar Station Sterling, VA
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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.