Wednesday, April21, 2021
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Marine Weather and Tides
Port Tobacco Village, MD

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 6:22AMSunset 7:52PM Wednesday April 21, 2021 1:37 AM EDT (05:37 UTC) Moonrise 12:35PMMoonset 2:30AM Illumination 68% 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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ANZ536 Tidal Potomac From Indian Head To Cobb Island- 1041 Pm Edt Tue Apr 20 2021
.small craft advisory in effect until 6 am edt Wednesday...
.gale warning in effect from 6 am edt Wednesday through late Wednesday night...
.gale watch in effect from late Wednesday night through Thursday afternoon...
Rest of tonight..S winds 10 kt with gusts to 20 kt. Waves 1 ft.
Wed..SW winds 10 to 15 kt with gusts to 20 kt... Becoming nw 15 to 20 kt with gusts to 30 kt late. Waves 1 ft...building to 3 ft in the afternoon. Numerous showers. Vsby 1 nm or less.
Wed night..NW winds 15 to 20 kt with gusts to 35 kt...becoming W 5 to 10 kt with gusts to 25 kt after midnight. Waves 2 to 3 ft.
Thu..W winds 10 to 15 kt with gusts to 25 kt. Waves 1 to 2 ft.
Thu night..W winds 10 to 15 kt. Gusts up to 25 kt in the evening. Waves 1 ft.
Fri..W winds 5 to 10 kt. Waves 1 ft.
Fri night..W winds around 5 kt. Waves 1 ft.
Sat..SE winds 5 to 10 kt...becoming ne after midnight. Waves 1 ft. Showers.
Sun..NW winds 10 to 15 kt. Waves 1 to 2 ft. Showers in the morning.
ANZ500 1041 Pm Edt Tue Apr 20 2021
Synopsis for the tidal potomac and md portion of the chesapeake bay.. High pressure will remain over the western atlantic through tonight. A strong cold front will pass through the waters Wednesday and high pressure will build to the south and west through late in the week. Low pressure may impact the waters this weekend. A small craft advisory may be needed for portions of the waters Thursday night.


7 Day Forecast for Marine Location Near Port Tobacco Village, MD
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location: 38.44, -77.11     debug


Area Discussion for - Baltimore, MD/Washington
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FXUS61 KLWX 210119 AAA AFDLWX

Area Forecast Discussion . UPDATED National Weather Service Baltimore MD/Washington DC 919 PM EDT Tue Apr 20 2021

SYNOPSIS. High pressure will build along the Mid-Atlantic coast tonight and Tuesday. A strong cold front will cross the area Wednesday. Canadian high pressure will build to our west Wednesday night through Thursday before settling to the south late in the week. Low pressure may affect the area over the weekend.

NEAR TERM /UNTIL 6 AM WEDNESDAY MORNING/.

Isold-sct showers over the nw part of the CWA are expected to fizzle out by midnight leaving a mild night in store with increasing clouds from west to east around daybreak.

SHORT TERM /6 AM WEDNESDAY MORNING THROUGH THURSDAY NIGHT/. The potent upper-level trough will dig overhead Wednesday through Wednesday night. The surface low associated with this will strengthen and track to our north while a cold front passes through our area Wednesday before moving offshore Wednesday evening The timing of the front. crossing the Blue Ridge around midday . will not allow much instability to build ahead of it. There will be enough, however, when combined with the strong linear forcing and strong shear, for a line of low topped convection to form somewhere between the Blue Ridge and Chesapeake Bay. Faster timing would likely result in a more eastward intensification and lower severe risk. All in all, the Marginal Risk from SPC adequately represents the potential for localized strong to damaging gusts with these showers/embedded storms.

West winds will increase behind the front with falling temperatures. Frequent gusts around 25 to 40 mph are expected. The cold advection and upslope flow will bring some snow showers for locations along and west of the Allegheny Front later Wednesday morning and afternoon. Snow may coat the ground along the ridge tops.

Cold advection will continue Wednesday night with the upper trough overhead. A few upslope snow showers may continue but additional accumulations will be minor. Cold advection temperature forecasts are tricky since often models take temperatures too low too quickly when winds remain elevated due to downsloping effects off the mountains. For the time being, have issued a Freeze Watch for the Shenandoah Valley where confidence is higher for subfreezing conditions. Headlines may need to be expanded upon further analysis.

The upper-level trough will remain overhead Thursday while low pressure slowly tracks into the Canadian Maritimes. Gusty northwest winds are expected and highs will only be in the 40s/50s. A few rain/snow showers could persist in the Appalachains. Winds will diminish Thursday night as the upper- level trough departs and high pressure builds nearby to the south and west. Additional frost/freeze headlines may be needed with a better radiational component to the cooling.

LONG TERM /FRIDAY THROUGH TUESDAY/. A brief mid-level ridge will move towards the region Friday. As heights rise, the column will warm leading to surface temperatures 10-12 degrees warmer than Thursday. This coupled with surface high pressure will result in sunny skies and a seasonable Spring day.

An upper-level trough will move from the central Plains to the East Coast by Saturday night. At the surface, a region of low pressure will track from the Four Corners region towards the local area. Ensemble guidance varies with exact track of low pressure Saturday night east of the Appalachians, but a track either through the region or southeast along the coast is most likely. Strong winds and a soaking rain are supported by nearly all guidance. Given preceding dry conditions, widespread flooding is currently not anticipated, though rises in local streams are possible. The severe thunderstorm threat appears to be minimal due to stable conditions with the current low track.

As the low moves to the northeast Sunday morning, a few rain showers could linger. Drying out later Sunday as an upper-level ridge approaches and surface high pressure builds. High pressure will linger into Monday keeping conditions dry. Temperatures Sunday into Monday will be in the mid-upper 60s, which is below normal for late April.

AVIATION /01Z WEDNESDAY THROUGH SUNDAY/. VFR conditions are expected through tonight. An isolated shower is possible tonight, but most of the time will be dry.

A strong cold front will pass through Wednesday. For now, have included a couple hours of SHRA with the exception of MRB and CHO, where coverage may be more scattered. While there will be a larger window for the potential of a shower, ultimately a strongly forced line of low topped convection could develop near the I-95 corridor that would be brief, but could contain a heavy downpour and strong winds. Added VCTS to BWI/MTN where the chance of a thunderstorm nearby is highest. VFR conditions are expected outside of any heavier showers.

A wind shift from the south and southwest to the northwest will accompany the frontal passage and gusts around 25 to 35 knots are expected behind the boundary midday Wednesday into the afternoon.

Gusty winds will continue through Thursday (although winds may diminish for a brief period late Wednesday night) before diminishing Thursday night as high pressure builds nearby.

VFR conditions at the terminals Friday into at least Saturday morning. Sub-VFR conditions become possible Saturday afternoon into Sunday morning due to low clouds and rain.

MARINE. An SCA is in effect overnight for the Bay as well as the lower Tidal Potomac River.

A strong cold front will pass through the waters around midday, and gusty northwest winds are expected behind the boundary. Have issued a Gale Warning for the entire day, although winds may not fully ramp up until later in the afternoon. Strong wind gusts may also occur with a line of showers and thunderstorms along the front. Winds will diminish some Wednesday night before picking back up Thursday. Have left the Gale Watch in effect for these time periods, with the current thinking that it may ultimately be a high end SCA.

High pressure will build to the south and west Thursday night, and winds will diminish, but an SCA may still be needed for portions of the waters.

SCA conditions could last into the day Friday. As the winds become southerly on Saturday, they will increase and SCA conditions become possible.

LWX WATCHES/WARNINGS/ADVISORIES. DC . None. MD . None. VA . Freeze Watch from late Wednesday night through Thursday morning for VAZ025>031-507-508. WV . Freeze Watch from late Wednesday night through Thursday morning for WVZ051>053. MARINE . Gale Watch from late Wednesday night through Thursday afternoon for ANZ530>543. Small Craft Advisory until 6 AM EDT Wednesday for ANZ530>534- 536>543. Gale Warning from 6 AM Wednesday to 2 AM EDT Thursday for ANZ530>543.

SYNOPSIS . ADS NEAR TERM . LFR SHORT TERM . ADS LONG TERM . CPB AVIATION . LFR/CPB MARINE . LFR/CPB


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
NCDV2 9 mi49 min S 9.9 G 14 63°F 63°F1010.4 hPa
WASD2 - 8594900 - Washington, DC 30 mi49 min S 11 G 15 64°F 60°F1010.2 hPa
BSLM2 - Chesapeake Bay, MD 32 mi67 min SW 8.9 61°F 1010 hPa51°F
SLIM2 - 8577330 - Solomons Island, MD 36 mi49 min SSW 14 G 18 61°F 59°F1011.4 hPa
PPTM2 - 8578240 - Piney Point, MD 37 mi49 min SSW 15 G 19
44062 - Gooses Reef, MD 38 mi43 min 19 G 23 57°F 56°F1 ft1011.7 hPa
COVM2 - 8577018 - Cove Point LNG Pier, MD 39 mi49 min SSE 16 G 20 62°F 1011.5 hPa
LWTV2 - 8635750 - Lewisetta, VA 46 mi49 min SSW 13 G 16 62°F 59°F1012 hPa
TPLM2 - Thomas Point, MD 48 mi37 min SSE 20 G 21 58°F 55°F1011.3 hPa (-1.0)54°F

Wind History for Washington, DC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Quantico Marine Corps Airfield - Turner Field, VA11 mi41 minS 1110.00 miFair64°F46°F52%1010.9 hPa
Stafford, Stafford Regional Airport, VA19 mi42 minS 810.00 miFair59°F33°F37%1011.8 hPa
Fort Belvoir, VA20 mi41 minSSE 610.00 miFair62°F42°F48%1010.4 hPa
Fredericksburg, Shannon Airport, VA22 mi62 minS 710.00 miFair60°F41°F49%1010.8 hPa

Link to 5 minute data for KNYG

Wind History from NYG (wind in knots)
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Last 24hrW4CalmSW3SW4W4SW3SW4S5S4S9S11S10
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S11S13--S12S9S13SW7S7S11S11S12S11
1 day agoW3W6W5W6W6W7W6CalmSW3S3SE9SE5S5S7S8SW7S6S7SE5CalmW5W5W3W3
2 days agoN4W6W6W4W4W6W4NE4NE5E7S4SE4S5SE4SE4NE4NW6W4CalmNW4W5W4W4SW5

Tide / Current Tables for Goose Bay, Port Tobacco River, Maryland
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Goose Bay
Click for Map
Wed -- 03:30 AM EDT     Moonset
Wed -- 05:05 AM EDT     0.33 feet Low Tide
Wed -- 06:23 AM EDT     Sunrise
Wed -- 11:22 AM EDT     1.63 feet High Tide
Wed -- 01:35 PM EDT     Moonrise
Wed -- 05:58 PM EDT     0.29 feet Low Tide
Wed -- 07:50 PM EDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.51.310.60.40.30.40.50.91.21.51.61.61.41.10.80.50.30.30.40.60.91.31.5

Tide / Current Tables for Maryland Point Light, Maryland
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Maryland Point Light
Click for Map
Wed -- 12:23 AM EDT     1.13 feet High Tide
Wed -- 03:30 AM EDT     Moonset
Wed -- 06:24 AM EDT     Sunrise
Wed -- 06:28 AM EDT     0.26 feet Low Tide
Wed -- 12:30 PM EDT     1.21 feet High Tide
Wed -- 01:36 PM EDT     Moonrise
Wed -- 07:21 PM EDT     0.22 feet Low Tide
Wed -- 07:51 PM EDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.11.110.80.60.40.30.30.40.60.91.11.21.21.10.90.70.50.30.20.20.40.60.9

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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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