Sunday, May31, 2020
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Marine Weather and Tides
North Chevy Chase, 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 5:43AMSunset 8:29PM Sunday May 31, 2020 11:46 AM EDT (15:46 UTC) Moonrise 1:35PMMoonset 1:44AM Illumination 71% Phase: Waxing Gibbous; Moon at 9 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- 1034 Am Edt Sun May 31 2020
.small craft advisory in effect until 2 pm edt this afternoon...
Rest of today..NW winds 10 kt. Waves 1 ft.
Tonight..N winds 5 to 10 kt. Waves 1 ft.
Mon..NW winds 5 to 10 kt. Waves 1 ft.
Mon night..SW winds around 5 kt. Waves 1 ft.
Tue..SW winds 5 kt. Waves less than 1 ft.
Tue night..SW winds around 5 kt. Waves 1 ft.
Wed..W winds around 5 kt. Waves 1 ft. A chance of showers and tstms through the night.
Thu..NW winds around 5 kt. Waves 1 ft. A chance of showers and tstms. Winds and waves higher and visibilities lower in and near tstms.
ANZ500 1034 Am Edt Sun May 31 2020
Synopsis for the tidal potomac and md portion of the chesapeake bay.. High pressure builds into the region through early this week. A warm front will cross the waters Tuesday night. Small craft advisory may be needed for portions of the waters tonight into early Monday morning.


7 Day Forecast for Marine Location Near North Chevy Chase, MD
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location: 39, -77.09     debug


Area Discussion for - Baltimore, MD/Washington
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FXUS61 KLWX 311343 AFDLWX

Area Forecast Discussion National Weather Service Baltimore MD/Washington DC 943 AM EDT Sun May 31 2020

SYNOPSIS. High pressure over the Upper Midwest builds eastward through Tuesday. Low pressure passing north of the Great Lakes will aim to lift a warm front through the area during the middle portion of the week. A cold front will approach the region thereafter before stalling in the region as we head into next weekend.

NEAR TERM /THROUGH TONIGHT/. High pressure is situated over the Upper Midwest this morning as a cold front extends off the Carolina coastline. Dry and pleasant conditions on tap today with a northerly breeze around 10 to 15 mph, gusting upwards of 25 mph at times through early afternoon. As the aforementioned high nudges closer today, winds will slacken this afternoon and remain on the lighter side through the overnight hours.

Dewpoints are quite comfortable this morning as surface observations highlight 40s area wide, indicating a much drier airmass compared to just a couple days ago when we had widespread dewpoints in the lower 70s. The drier airmass is also evident on water vapor imagery and the lack of clouds on the visible channel. Additionally, this mornings upper air sounding out of IAD measured a measly 0.37 inches of precipitable water, registering below the 10th percentile for the date.

Vibrant sunshine can be expected the remainder of the day as temperatures rise into the low to middle 70s under a cold air advection regime on the heels of the northerly breeze. Clear and seasonably chilly conditions tonight as the high centers over the Ohio Valley. Could see a few mid-high clouds creep in from the north overnight as we reside on the backside of the upper trough axis and the jet stream dips southward over the region. Otherwise, widespread temperatures in the 40s expected, hovering in the lower 50s in the city centers and near the larger bodies of water. Colder locations along the Alleghenies will dip into the upper 30s.

SHORT TERM /MONDAY THROUGH TUESDAY NIGHT/. High will continue to build southeastward toward and over the region through Monday night. Mostly clear skies, below normal temperatures, and dry conditions will be the resultant weather. Highs Monday will hold in the low to middle 70s, with overnight lows falling back into 40s to middle 50s.

Mid-upper level clouds will increase Monday night as we reside on the eastern periphery of an upper ridge and a weak shortwave seems poised to drop southeastward from the Great Lakes. Will hold on to a dry forecast Monday night, but wouldn't be surprised if low end chance POPs sneak in at some point, at least across northern Maryland and eastern West Virginia.

Rain chances return on Tuesday as a weak upper-level shortwave passes over the region. A surface warm front will also be lifting north, as surface high pressure shifts offshore. Given the warmer and more humid environment, can't rule out a thunderstorm Tuesday afternoon as well. Highs Tuesday reach the lower 80s.

LONG TERM /WEDNESDAY THROUGH SATURDAY/. At the start of the long term, a broad ridge will dominate the southeastern adn south central US, with cut-off lows over Atlantic Canada and southwest of southern California. A weak trough will be located over the Great Lakes. By Thursday, the ridge locally will weaken in the wake of the passage of the trough in the Great Lakes, which will help cause the closed low over Atlantic Canada to retrograde westward a bit. On Friday, another weak shortwave will cross the area as the closed low to the north starts retreating away from our area once again. By Saturday, yet another weak shortwave will cross the region, but by this point the whole ridge will start to buckle, expanding north across the Plains while being infringed by a new closed low over the Pacific Northwest, which will absorb the closed low southwest of California.

At the surface, a warm front will advance across the region early Wednesday, allowing very warm to borderline hot air to overspread the region for the first time this year. Highs may reach 90 in many areas. However, this may not last long, as most guidance then drops a cold front southward into the region by Thursday, though some models are slower than others with its progress. This front will waffle across the region on Friday and Saturday. With northwesterly flow aloft on the northeast side of the ridge, significant widespread rain is not expected despite the near-stationary front, but showers and thunderstorms will be possible each day. The position of the front each day will determine temperatures, with significantly cooler readings likely north and east of the boundary, while very warm readings should prevail south and west.

AVIATION /13Z SUNDAY THROUGH THURSDAY/. Northerly winds expected throughout the day today, gusting to around 20 knots at times through early afternoon before relaxing later in the afternoon. VFR conditions will prevail, as high pressure builds in out of the Upper Midwest. High pressure then continues to build over the region, with light winds and VFR conditions expected through Monday night.

Showers and a few thunderstorms cannot be ruled out at the MRB, MTN and BWI Tuesday, as a warm front lifts through the area. Brief restrictions possible in any thunderstorm.

Most likely VFR most of the time Wednesday and Thursday. A back door cold front could try to bring lower cigs on Thursday, but uncertainty here is high. Otherwise, main concern will be potential for scattered thunderstorms.

MARINE. Small Craft Advisory continues through early afternoon as high pressure builds toward the region delivering northerly breezes gusting to around 20 knots at times. Winds are expected to relax later this afternoon as the high nudges closer and the gradient slackens.

High pressure then continues to build across the region through Monday night as a light northerly flow persists. Gusts could approach marginal SCA levels the first half of tonight with northerly channeling on the main stem of the Bay. Will assess this potential as the morning model guidance filters in.

Winds turn out of the south to southwest on Tuesday as high pressure shifts offshore, pushing a warm front through the region. Winds remain below SCA criteria, but could see showers or a thunderstorm in the northern Bay during the afternoon.

Warm air over cool waters should help keep winds below SCA thresholds Wednesday and Thursday. Main concern will be risk of scattered thunderstorms both days.

LWX WATCHES/WARNINGS/ADVISORIES. DC . None. MD . None. VA . None. WV . None. MARINE . Small Craft Advisory until 2 PM EDT this afternoon for ANZ530>543.

SYNOPSIS . CJL NEAR TERM . BKF SHORT TERM . CJL LONG TERM . RCM AVIATION . RCM/CJL MARINE . BKF/CJL


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
WASD2 - 8594900 - Washington, DC 10 mi46 min WNW 11 G 11 68°F 74°F1021.3 hPa (+0.3)
BSLM2 - Chesapeake Bay, MD 25 mi136 min N 2.9 1020 hPa
APAM2 - 8575512 - Annapolis, MD 32 mi46 min 67°F 1020.4 hPa (+0.0)
BLTM2 - 8574680 - Baltimore, MD 33 mi46 min N 8 G 15 66°F 67°F1020.5 hPa (+0.0)
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 33 mi46 min NNW 13 G 15 65°F 1020.6 hPa (+0.0)
44063 - Annapolis 34 mi34 min 62°F 69°F1 ft1020.7 hPa
FSNM2 34 mi58 min NNW 12 G 16 64°F 1020.5 hPa
TPLM2 - Thomas Point, MD 35 mi46 min NNE 9.9 G 12 62°F 67°F1021.8 hPa (+0.6)45°F
CPVM2 37 mi46 min 63°F
44062 - Gooses Reef, MD 47 mi28 min NNE 7.8 G 9.7 64°F
NCDV2 47 mi52 min NNW 6 G 9.9 69°F 72°F1020.5 hPa
TCBM2 - 8573364 - Tolchester Beach, MD 47 mi100 min NNE 6 G 8 62°F 71°F1021.2 hPa

Wind History for Washington, DC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Washington/Reagan National Airport, DC, VA10 mi54 minNNW 12 G 1710.00 miA Few Clouds69°F43°F39%1021.4 hPa
Gaithersburg - Montgomery County Airport, MD12 mi50 minVar 610.00 miPartly Cloudy66°F43°F43%1023 hPa
Camp Springs / Andrews Air Force Base, MD17 mi50 minN 710.00 miFair67°F42°F41%1021.5 hPa
Fort Belvoir, VA19 mi50 minN 610.00 miFair70°F39°F34%1021.6 hPa
Washington/Dulles International Airport, DC, VA19 mi54 minN 1110.00 miA Few Clouds68°F39°F36%1021.4 hPa

Link to 5 minute data for KCGS

Wind History from CGS (wind in knots)
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Last 24hrNW6N4N5NW5NW3NW4NW6NW3CalmNW3N4NW5NW5NW6NW7----------------N9
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1 day agoS7SW6S8S6S7S6SW6SW8
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W3CalmCalmCalmCalmCalmNW3NW7W7NW4N4
2 days ago--------------------------------------------SW5SW5

Tide / Current Tables for Chain Bridge, D.C.
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Chain Bridge
Click for Map
Sun -- 02:43 AM EDT     Moonset
Sun -- 04:07 AM EDT     3.23 feet High Tide
Sun -- 05:45 AM EDT     Sunrise
Sun -- 10:57 AM EDT     0.49 feet Low Tide
Sun -- 02:34 PM EDT     Moonrise
Sun -- 04:30 PM EDT     3.13 feet High Tide
Sun -- 08:27 PM EDT     Sunset
Sun -- 11:18 PM EDT     0.30 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.91.72.533.23.12.621.40.90.60.50.71.32.12.83.13.12.72.11.50.90.50.3

Tide / Current Tables for Chain Bridge, one mile below, D.C.
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Chain Bridge
Click for Map
Sun -- 02:43 AM EDT     Moonset
Sun -- 04:02 AM EDT     3.23 feet High Tide
Sun -- 05:45 AM EDT     Sunrise
Sun -- 10:52 AM EDT     0.49 feet Low Tide
Sun -- 02:34 PM EDT     Moonrise
Sun -- 04:25 PM EDT     3.13 feet High Tide
Sun -- 08:27 PM EDT     Sunset
Sun -- 11:13 PM EDT     0.30 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.91.72.63.13.23.12.621.40.90.60.50.71.42.22.83.13.12.72.11.40.90.50.3

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.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Baltimore, MD/Washington (11,2,3,4)
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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.