Friday, March5, 2021
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Marine Weather and Tides
Shenandoah Farms, 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 6:37AMSunset 6:10PM Friday March 5, 2021 2:17 PM EST (19:17 UTC) Moonrise 12:37AMMoonset 10:36AM Illumination 54% Phase: Third Quarter Moon; Moon at 22 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- 1240 Pm Est Fri Mar 5 2021
.small craft advisory in effect until midnight est tonight...
.small craft advisory in effect from Saturday morning through Saturday afternoon...
This afternoon..NW winds 15 kt with gusts to 25 kt. Waves 1 ft.
Tonight..NW winds 5 to 10 kt with gusts to 20 kt. Waves 1 ft.
Sat..NW winds 5 to 10 kt with gusts to 20 kt. Waves 1 ft.
Sat night..NW winds 5 kt. Waves less than 1 ft.
Sun..NW winds 5 to 10 kt. Waves 1 ft.
Sun night..N winds 5 kt. Waves less than 1 ft.
Mon..SW winds 5 kt. Waves less than 1 ft.
Tue..SW winds 5 kt. Waves less than 1 ft.
ANZ500 1240 Pm Est Fri Mar 5 2021
Synopsis for the tidal potomac and md portion of the chesapeake bay.. High pressure will slowly build over the waters through Sunday before moving offshore during the early and middle portions of next week. A small craft advisory may be needed for portions of the waters Saturday night into early Sunday.


7 Day Forecast for Marine Location Near Shenandoah Farms, VA
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location: 39.01, -78.02     debug


Area Discussion for - Baltimore, MD/Washington
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FXUS61 KLWX 051451 AFDLWX

Area Forecast Discussion National Weather Service Baltimore MD/Washington DC 951 AM EST Fri Mar 5 2021

SYNOPSIS. Strong Canadian high pressure over the Great Lakes will slowly build toward the region through the weekend before shifting into the Southeast early next week, before migrating offshore toward the middle of next week.

NEAR TERM /THROUGH TONIGHT/.

Strong high pressure remains over the Great Lakes while an upper level low retrogrades over eastern Canada. The combination of the two systems continues to induce a gusty northwesterly flow of 20 to 30 mph across the area. Albeit dry, cooler temperatures are expected today with low to mid 40s for most with upper 20s to low 30s across the higher terrain and valley areas.

Winds may diminish some tonight, but it will remain cold with lows in the 20s for most areas (teens in the mountains).

SHORT TERM /SATURDAY THROUGH SUNDAY NIGHT/.

PREVIOUS DISCUSSION . The low will remain over eastern Canada while the surface high does build a little closer to our region. A blustery northwest flow will bring more dry conditions along with sunshine, but it will remain chilly for this time of year.

The high will build overhead Saturday night through Sunday night, allowing for winds to diminish. However, it will remain chilly for this time of year.

LONG TERM /MONDAY THROUGH THURSDAY/. Large scale troughing will shift offshore on Monday, giving way to increasingly zonal flow aloft. High pressure will settle overhead within the zone of subsidence behind the departing trough, leading to mostly sunny skies and light winds. High temperatures on Monday will top out in the lower 50s for most.

The aforementioned large area of high pressure at the surface will slide offshore and become nearly stationary through the middle of the week. Meanwhile, a positively tilted trough will move into the western CONUS, and very slowly translate eastward throughout the week. This will result in a somewhat stagnant flow pattern across the CONUS, with a strong belt of southwesterly flow aloft stretching from the Desert Southwest to the Great Lakes. Several weak disturbances embedded within that southwesterly flow aloft will progress off to our northwest during the middle to latter portions of the week, but most of the forcing for ascent should be displaced off to our northwest. As a result, conditions are expected to stay mostly dry, but a few showers can't be ruled out (especially across northwestern portions of the forecast area) by Wednesday Night into Thursday as the troughing slowly progresses further to the south and east.

The main item of note in the long term portion of the forecast will be the well above normal temperatures. Persistent southerly surface flow on the backside of the offshore high/southwesterly flow aloft ahead of the positively tilted trough situated off to our northwest will transport an anomalously warm airmass into the region, and then maintain it through much of the week. Highs on Tuesday and Wednesday are expected to be in the 60s, with some lower 70s even possible by Thursday.

AVIATION /15Z FRIDAY THROUGH TUESDAY/. VFR conditions will persist through Sunday night. Gusty northwest winds around 20 to 30 knots are expected today. Winds may diminish some tonight, but gusty northwest winds around 15 to 25 knots are expected Saturday. Winds will diminish Saturday night through Sunday night as high pressure builds overhead.

VFR conditions and light winds are expected at the terminals on Monday and Tuesday.

MARINE. Low pressure over eastern Canada and high pressure over the Great Lakes will allow for gusty northwest winds over the waters through Saturday. An SCA is in effect for all of the waters through this evening. The SCA remains in effect overnight for the lower Tidal Potomac River and middle portion of the Bay, before picking back up for all of the waters Saturday.

High pressure will build toward the waters Saturday night through Sunday night. Winds may still approach SCA criteria for portions of the waters (middle Bay and lower Tidal Potomac River) Saturday night into early Sunday, but winds should remain below SCA criteria for most o the time later Sunday and Sunday night.

Sub-SCA level winds are expected over the waters on both Monday and Tuesday.

FIRE WEATHER. Dry weather will persist through Saturday and the RH values will be low each day (teens and 20s today, and teens/20s over central VA Saturday with 20s and 30s across the rest of the area Saturday). Gusty northwest winds are expected during this time as well, with frequent gusts around 20 to 30 mph for most areas today and 15 to 25 mph for Saturday. As fuels continue to dry out over the next few days, the meteorological conditions may enhance the threat for the spread of wildfires.

Confidence is too low at this time for any headlines since the soils are likely holding onto some moisture due to recent rain and snowmelt, and it will remain chilly as well.

Dry conditions with low humidity will likely continue for Sunday and Monday, but winds should be less due to high pressure building overhead.

Warmer conditions are expected for the middle portion of next week, but there will likely be more atmospheric moisture.

LWX WATCHES/WARNINGS/ADVISORIES. DC . None. MD . None. VA . None. WV . None. MARINE . Small Craft Advisory until 6 PM EST Saturday for ANZ531>534- 537-539>541-543. Small Craft Advisory until midnight EST tonight for ANZ530-535- 536-538-542. Small Craft Advisory from 8 AM to 6 PM EST Saturday for ANZ530- 535-536-538-542.

SYNOPSIS . BJL/MSS NEAR TERM . BJL/MSS SHORT TERM . BJL LONG TERM . KJP AVIATION . BJL/KJP MARINE . BJL/KJP FIRE WEATHER .


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
WASD2 - 8594900 - Washington, DC 54 mi48 min NW 11 G 21 39°F 44°F1018.2 hPa
BSLM2 - Chesapeake Bay, MD 71 mi48 min N 11 38°F 1017 hPa9°F
BLTM2 - 8574680 - Baltimore, MD 78 mi48 min NNW 8.9 G 22 37°F 40°F1016.4 hPa

Wind History for Washington, DC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Winchester Regional, VA12 mi23 minW 17 G 2510.00 miFair37°F16°F41%1016.9 hPa
Leesburg / Godfrey, VA24 mi23 minWNW 20 G 2910.00 miFair and Breezy39°F16°F39%1017.9 hPa

Link to 5 minute data for KOKV

Wind History from OKV (wind in knots)
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2 days agoNW9NW6NW6NE3E3CalmCalmCalmCalmCalmCalmCalmCalmCalmW4SW3CalmCalmSW5SW4W5
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Tide / Current Tables for Chain Bridge, D.C.
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Chain Bridge
Click for Map
Fri -- 12:33 AM EST     Moonrise
Fri -- 12:57 AM EST     2.80 feet High Tide
Fri -- 06:34 AM EST     Sunrise
Fri -- 07:24 AM EST     0.04 feet Low Tide
Fri -- 10:32 AM EST     Moonset
Fri -- 01:11 PM EST     3.24 feet High Tide
Fri -- 06:05 PM EST     Sunset
Fri -- 08:31 PM EST     0.07 feet Low Tide
Fri -- 08:32 PM EST     Last Quarter
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.62.82.621.40.80.30.10.10.51.32.333.23.12.621.40.80.40.10.10.51.3

Tide / Current Tables for Chain Bridge, one mile below, D.C.
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Chain Bridge
Click for Map
Fri -- 12:33 AM EST     Moonrise
Fri -- 12:52 AM EST     2.80 feet High Tide
Fri -- 06:34 AM EST     Sunrise
Fri -- 07:19 AM EST     0.04 feet Low Tide
Fri -- 10:32 AM EST     Moonset
Fri -- 01:06 PM EST     3.24 feet High Tide
Fri -- 06:05 PM EST     Sunset
Fri -- 08:26 PM EST     0.07 feet Low Tide
Fri -- 08:32 PM EST     Last Quarter
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.72.82.521.30.70.30.10.10.61.42.433.23.12.61.91.30.80.40.10.10.61.4

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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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