Thursday, April22, 2021
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Marine Weather and Tides
Mason Neck, VA

Version 3.4
NOTICE
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 6:20AMSunset 7:53PM Thursday April 22, 2021 10:07 AM EDT (14:07 UTC) Moonrise 1:43PMMoonset 3:07AM Illumination 81% Phase: Waxing Gibbous; Moon at 11 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- 933 Am Edt Thu Apr 22 2021
.small craft advisory in effect through this evening...
Rest of today..W winds 15 kt with gusts to 25 kt. Waves 1 ft.
Tonight..W winds 10 to 15 kt with gusts to 25 kt... Diminishing to 5 kt after midnight. Waves 1 ft.
Fri..W winds 5 to 10 kt. Waves 1 ft.
Fri night..SW winds 5 to 10 kt. Waves 1 ft.
Sat..S winds 5 to 10 kt. Waves 1 ft. Rain likely.
Sat night..S winds 5 to 10 kt. Waves 1 ft. Rain.
Sun..NW winds 10 to 15 kt. Waves 1 ft. A chance of showers in the morning.
Mon..N winds 5 to 10 kt...becoming se after midnight. Waves 1 ft.
ANZ500 933 Am Edt Thu Apr 22 2021
Synopsis for the tidal potomac and md portion of the chesapeake bay.. High pressure will build to the west today before settling to our south Friday. Low pressure will pass through the waters this weekend. Small craft advisories will likely be needed this weekend.


7 Day Forecast for Marine Location Near Mason Neck, VA
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location: 38.65, -77.13     debug


Area Discussion for - Baltimore, MD/Washington
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FXUS61 KLWX 220806 AFDLWX

Area Forecast Discussion National Weather Service Baltimore MD/Washington DC 406 AM EDT Thu Apr 22 2021

SYNOPSIS. High pressure will build to our southwest today through tonight, before progressing offshore on Friday. Low pressure will pass overhead Saturday night, before moving off to our northeast on Sunday. High pressure will move back in for the early to middle portions of next week.

NEAR TERM /THROUGH TONIGHT/. Low pressure has pulled away toward the Canadian Maritimes this morning, but upper level troughing remains overhead. Winds have slackened a bit overnight, but most locations have maintained westerly winds. Some locations in the Virginia Piedmont and Shenandoah Valley have decoupled, and those are the locations that have dropped to freezing. If more locations were to decouple, they could drop to freezing as well, but for now expect that most locations that maintain winds will stay just above freezing this morning. Snow showers are streaming down in northwest flow from Ohio and Pennsylvania. These snow showers should remain primarily along and northwest of the Allegheny Front through daybreak, but a few flurries may be able to spill over into the eastern WV Panhandle or northern MD early this morning.

Low-level west-northwesterly flow will be maintained today, and winds should pick back up again shortly after sunrise as mixing commences. While it won't be quite as windy as yesterday, winds should gust to around 30 mph out of the west-northwest through most of the day. Skies are also expected to become mostly cloudy today as a stratocumulus deck forms in response to mixing. A shortwave situated on the backside of the larger scale trough will pivot from the southern Great Lakes toward southwest Virginia today. This disturbance will spark the development of showers across West Virginia. Most of the activity will remain along and west of the Allegheny Front, but a few showers may spill over the mountains and into the central Shenandoah Valley or central Virginia later this afternoon. The showers should mostly be in the form of snow along the ridgetops, with rain showers at lower elevations, although a little graupel may mix in with some of the more convective showers. Some of these snow showers could be on the heavier side along the Allegheny Front from Grant County southward to Highland County, where most guidance shows snow squall parameter values increasing to well above one. Any accumulations should be minimal and relegated to the highest of elevations, with most spots even along the Allegheny Front rising above freezing.

This shower activity across southwestern portions of the forecast area should wind down this evening as daytime heating is lost and the aforementioned shortwave pivots off to the south and east. Winds will decrease again tonight, and more locations should decouple compared to early this morning. However the airmass will be a bit warmer. As a result, temperatures may drop to freezing again in locations that decouple. It will again be a close call as to whether many spots remain just above or just below freezing, so the Freeze Watch has been maintained.

SHORT TERM /FRIDAY THROUGH SATURDAY NIGHT/. The upper-level trough will progress off to our east on Friday, allowing high pressure to build to our south at the surface. With high pressure in control, mostly sunny skies and light winds are expected, along with warmer but still below normal temperatures. Most locations should see highs in the 60s.

The next shortwave and associated area of low pressure at the surface will approach the area from the southwest on Saturday. The day should start out dry for all, but clouds will be on the increase through the morning. Rain will overspread the area from southwest to northeast through the afternoon, and a soaking rain is expected for all through Saturday night. Rainfall amounts should generally be around a half of an inch to an inch for most.

LONG TERM /SUNDAY THROUGH WEDNESDAY/. The long term features a general drying and warming trend. To start, low pressure will be pulling northeast out of the area Sunday. Some showers may linger, especially early, with a brisk northwest wind, but temperatures will not be nearly as chilly as what we are experiencing presently. High pressure will then build across the region to our north Monday before shifting south of the area Tuesday and Wednesday. This will cause northerly winds to shift southwesterly, providing a strong warming trend. All the while, heights will be rising significantly as the trough over the region Sunday is replaced by a strong ridge by the middle of the week. Thus, temperatures which will start off near normal Sunday and Monday will rise well above normal by Wednesday. Current forecast brings temps to the 80s Wednesday. After the showers pull away Sunday, dry weather should prevail thanks to the high pressure and building ridge.

AVIATION /07Z THURSDAY THROUGH MONDAY/. Winds have dropped off a bit overnight, but will pick up again shortly after sunrise, with gusts of 25 to 30 knots out of the west-northwest common throughout the daylight hours. Skies will become mostly cloudy, but ceilings will remain VFR. Winds will drop off tonight, but remain out of the west to west-northwest. Conditions will remain VFR through Saturday morning, but should deteriorate to sub-VFR Saturday afternoon through Saturday night in association with low clouds and rain as an area of low pressure moves through.

Lingering reduced cigs and vsby are possible Sunday, especially in the morning, as low pressure pulls out of the area. Otherwise, a gusty northwest wind Sunday will gradually dwindle as high pressure builds across the area Monday with VFR conditions.

MARINE. A Gale Warning is in effect for locations south of North Beach through 6 AM. Thereafter, a Small Craft Advisory is in effect for all location through today. Gusts to around 30 knots are expected through much of the daylight hours. Winds will decrease a bit overnight, but remain above at SCA levels overnight. As a result, the SCA has been extended through tonight, with the exception of the Upper Tidal Potomac, where it ends at midnight. Gusts overnight will be closer to 20 knots. SCA level winds may linger into Friday, especially over northern waters, but it will be marginal, so no headline decisions have been made as of yet.

Winds should drop below SCA values Friday night through Saturday morning, but should rise back up to SCA levels Saturday afternoon through Saturday night as an area of low pressure moves through.

Widespread Small Craft Advisory winds are expected as low pressure pulls out of the region Sunday. These winds gradually diminish Monday as high pressure builds across the region.

FIRE WEATHER. It will be windy and dry today with critical Rh's and winds, however, most places are now experiencing green-up with fuel moisture values now above critical levels. Therefore, not anticipating red flag conditions.

LWX WATCHES/WARNINGS/ADVISORIES. DC . None. MD . Freeze Watch from late tonight through Friday morning for MDZ003>005. Freeze Warning until 9 AM EDT this morning for MDZ003>006-507. VA . Freeze Watch from late tonight through Friday morning for VAZ025>031-036>040-051-501-505-507-508. Freeze Warning until 9 AM EDT this morning for VAZ025>031- 036>040-051-501-505-507-508. WV . Freeze Watch from late tonight through Friday morning for WVZ051>053. Freeze Warning until 9 AM EDT this morning for WVZ051>053. MARINE . Small Craft Advisory until 6 AM EDT Friday for ANZ530>532-536- 538>540. Small Craft Advisory until 6 AM EDT Friday for ANZ533-534-537- 541>543. Gale Warning until 6 AM EDT early this morning for ANZ533-534- 537-541>543. Small Craft Advisory until midnight EDT tonight for ANZ535.

SYNOPSIS . KJP NEAR TERM . KJP SHORT TERM . KJP LONG TERM . RCM AVIATION . RCM/KJP MARINE . RCM/KJP FIRE WEATHER . LFR


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
WASD2 - 8594900 - Washington, DC 16 mi49 min WNW 5.1 G 11 44°F 59°F1017.5 hPa
NCDV2 23 mi49 min WNW 4.1 G 11 46°F 58°F1017.2 hPa
BSLM2 - Chesapeake Bay, MD 24 mi37 min N 8 43°F 1016 hPa24°F
44062 - Gooses Reef, MD 38 mi37 min 18 G 23 41°F 54°F1 ft1017.8 hPa
APAM2 - 8575512 - Annapolis, MD 41 mi49 min W 8.9 G 13 46°F 56°F1016.1 hPa
TPLM2 - Thomas Point, MD 41 mi67 min WSW 18 G 21 41°F 54°F1017.4 hPa (+1.0)23°F
44063 - Annapolis 42 mi37 min 18 G 31 41°F 54°F1017.4 hPa
COVM2 - 8577018 - Cove Point LNG Pier, MD 43 mi49 min W 14 G 28 43°F 1017 hPa
SLIM2 - 8577330 - Solomons Island, MD 43 mi49 min W 8 G 16 45°F 56°F1017 hPa
CPVM2 46 mi49 min 43°F 25°F
PPTM2 - 8578240 - Piney Point, MD 48 mi49 min WNW 16 G 20

Wind History for Washington, DC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Fort Belvoir, VA6 mi71 minW 710.00 miFair44°F22°F40%1017.6 hPa
Quantico Marine Corps Airfield - Turner Field, VA13 mi71 minWNW 710.00 miPartly Cloudy44°F24°F45%1018.3 hPa
Washington/Reagan National Airport, DC, VA15 mi75 minW 9 G 1910.00 miMostly Cloudy44°F23°F43%1017.1 hPa
Camp Springs / Andrews Air Force Base, MD19 mi71 minW 12 G 2010.00 miA Few Clouds43°F23°F45%1017.1 hPa
Manassas, Manassas Regional Airport/Harry P. Davis Field, VA21 mi71 minNW 16 G 2110.00 miMostly Cloudy43°F22°F43%1018.4 hPa
Stafford, Stafford Regional Airport, VA24 mi72 minW 710.00 miFair44°F12°F27%1019.3 hPa

Link to 5 minute data for KDAA

Wind History from DAA (wind in knots)
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--------W3SE3CalmNW3SW5W7
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S7S7SE7SE7SE8SE7SE6SE6SE5S7SE4CalmS5S8S9
2 days agoW5SE3CalmCalmSE5E4S5SE6SE7S3CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalm

Tide / Current Tables for Gunston Cove, Virginia
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Gunston Cove
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Thu -- 04:04 AM EDT     2.07 feet High Tide
Thu -- 04:07 AM EDT     Moonset
Thu -- 06:22 AM EDT     Sunrise
Thu -- 10:21 AM EDT     0.40 feet Low Tide
Thu -- 02:43 PM EDT     Moonrise
Thu -- 04:19 PM EDT     2.16 feet High Tide
Thu -- 07:52 PM EDT     Sunset
Thu -- 11:03 PM EDT     0.33 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.81.21.722.121.71.30.90.60.40.40.71.11.622.12.11.81.410.70.40.3

Tide / Current Tables for Deep Point, Mattawoman Creek, Maryland
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Deep Point
Click for Map
Thu -- 03:21 AM EDT     1.67 feet High Tide
Thu -- 04:07 AM EDT     Moonset
Thu -- 06:22 AM EDT     Sunrise
Thu -- 09:37 AM EDT     0.34 feet Low Tide
Thu -- 02:43 PM EDT     Moonrise
Thu -- 03:35 PM EDT     1.74 feet High Tide
Thu -- 07:52 PM EDT     Sunset
Thu -- 10:19 PM EDT     0.27 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.91.31.61.71.61.41.10.80.50.40.30.50.81.21.61.71.71.61.30.90.60.40.30.3

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