Monday, May10, 2021
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Marine Weather and Tides
Alexandria, 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 5:58AMSunset 8:10PM Monday May 10, 2021 5:47 PM EDT (21:47 UTC) Moonrise 4:36AMMoonset 6:14PM Illumination 1% Phase: New Moon; Moon at 29 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- 437 Pm Edt Mon May 10 2021
.small craft advisory in effect until 6 pm edt this evening...
Rest of this afternoon..NW winds 10 kt with gusts to 20 kt. Waves 1 ft.
Tonight..N winds 5 to 10 kt. Waves 1 ft.
Tue..NW winds 5 to 10 kt. Gusts up to 20 kt in the late morning and afternoon. Waves 1 ft. A chance of showers.
Tue night..NW winds 5 to 10 kt. Waves 1 ft.
Wed..NW winds 5 to 10 kt with gusts to 20 kt. Waves 1 ft.
Wed night..NW winds 5 to 10 kt. Waves 1 ft.
Thu..SW winds around 5 kt. Waves 1 ft.
Fri..NW winds around 5 kt. Waves 1 ft.
ANZ500 437 Pm Edt Mon May 10 2021
Synopsis for the tidal potomac and md portion of the chesapeake bay.. A cold front will push southeast of the area today. High pressure over the upper midwest will slowly expand toward the area during the middle of the week, settling over the east coast late in the week. Small craft advisories will likely be needed for portions of the waters Tuesday through Wednesday.


7 Day Forecast for Marine Location Near Alexandria, VA
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location: 38.83, -77.04     debug


Area Discussion for - Baltimore, MD/Washington
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FXUS61 KLWX 101929 AFDLWX

Area Forecast Discussion National Weather Service Baltimore MD/Washington DC 329 PM EDT Mon May 10 2021

SYNOPSIS. A cold front will settle to our south today. A slow moving upper trough will reside to our north tomorrow and Wednesday, with high pressure building overhead at the surface for the middle to latter portions of the week.

NEAR TERM /UNTIL 6 AM TUESDAY MORNING/. Showers have finally cleared the area, and this morning's solid overcast has largely broken up outside of southern Maryland to near Fredericksburg. Just a few fair weather cumulus clouds remain further north as post cold frontal northerly flow ushers cooler and drier air into the region. Temperatures will max out in the 60s this afternoon for most.

The overnight hours will start out with mostly clear skies, but clouds will be on the increase overnight as a weak disturbance embedded in zonal flow passes through. The HRRR even hints that a few light showers may try to form across southwestern portions of the forecast area. If any showers were to form, they'd be light and brief in nature. Cloud cover will keep temperatures warmer than they potentially could be, with overnight lows ranging from the upper 30s in the mountains, to around 50 in downtown DC and Baltimore.

SHORT TERM /6 AM TUESDAY MORNING THROUGH WEDNESDAY NIGHT/. A mid-upper level trough currently centered over Lake Superior will slowly drift southward toward our area during the day tomorrow. As the upper low drops southward, and mid-levels start to cool, showers are expected to develop in response to daytime heating tomorrow afternoon. With equilibrium levels around -10 C, no lightning is expected, but the showers could produce a brief heavy downpour with gusty winds. Any showers should decay shortly after dark with loss of daytime heating. As the trough drops southward, it will drive a very weak reinforcing cold front through the area. Temperatures will be quite chilly tomorrow night, with lows dropping into the 30s (to the west of the Blue Ridge) and lower to middle 40s (to the east of the Blue Ridge). Issued a Freeze Watch for most of the Allegheny Front where temperatures are likely to be coldest.

Zonal flow aloft will be maintained on Wednesday as the upper low to our north starts to move off to the east. At the surface, high pressure will build toward the area from the Great Lakes. The combination of building high pressure and zonal flow aloft will lead to mostly sunny skies. Temperatures will hold below normal (highs in the 60s) as northwesterly winds in advance of the approaching high continue to transport seasonably cool air into the area. As high pressure builds closer still Wednesday night, wind may go weak enough for some spots to decouple. As a result, frost/freeze headlines may potentially be needed again to the west of the Blue Ridge.

LONG TERM /THURSDAY THROUGH MONDAY/. Cyclonic flow begins to exit the northeastern U.S. on Thursday with a split jet structure noted further upstream. A sprawling ridge of surface high pressure extends from the Missouri Valley into much of the eastern U.S. While a passing shortwave trough will weaken this dome of high pressure, it should remain a fixture in the forecast into the upcoming weekend. Models are in agreement that height falls should move through the Mid-Atlantic on Friday. Compared to this past weekend's upper low, this should be much less impressive in terms of shower production. The vertical column is not nearly as cold, instability is nearly non-existent, and wind fields aloft are quite weak. However, will maintain a chance of some showers for Friday. This system eventually induces cyclogenesis well off the southeastern U.S. coast which is of no consequence to the Mid- Atlantic region.

For the weekend, the northern stream is forecast to dominate the pattern with prevailing northwesterly flow expected. This will maintain the extended period of below average temperatures. Depending on the level of amplification of the upstream flow, some shower chances may intermittently impact the region over the weekend. Confidence does remain low in the threat for showers. Winds eventually become westerly by Sunday which may bring temperatures closer to mid-May climatology. This would favor mid 70s with 60s across the higher terrain. Will continue to monitor the progression of an approaching warm front which may aid in further warmth into next week. The composite of global ensembles support a warming trend which also is indicated in the Day 6-10 Climate Prediction Center outlook.

AVIATION /20Z MONDAY THROUGH SATURDAY/. VFR conditions and northwesterly winds are expected at the terminals through Wednesday. Winds may gust to around 15 to 20 knots each afternoon.

Thursday and Friday should bring VFR conditions to the terminals. With surface high pressure in place, winds are to be on the lighter side with variable directions at times. A few showers are possible by Friday, but confidence is below average.

MARINE. Winds will remain northwesterly through Wednesday, with gusts to low-end SCA levels at times. The only opportunity for winds to get stronger than low-end SCA will be tomorrow afternoon in any convective showers that form. Coverage of these showers isn't expected to be high, but an SMW or two can't be ruled out tomorrow afternoon if these showers are able to bring higher winds down from aloft.

Sprawling high pressure across the area will keep winds below small craft levels for Thursday and Friday, and likely into the weekend as well.

LWX WATCHES/WARNINGS/ADVISORIES. DC . None. MD . Freeze Watch from late Tuesday night through Wednesday morning for MDZ001. VA . Freeze Watch from late Tuesday night through Wednesday morning for VAZ503. WV . Freeze Watch from late Tuesday night through Wednesday morning for WVZ501-505. MARINE . Small Craft Advisory until 6 PM EDT this evening for ANZ530>543. Small Craft Advisory from 11 PM this evening to 5 AM EDT Tuesday for ANZ530>532-538>540. Small Craft Advisory from 11 PM this evening to 9 AM EDT Tuesday for ANZ533-534-537-541>543.

SYNOPSIS . KJP NEAR TERM . KJP SHORT TERM . RCM/KJP LONG TERM . BRO AVIATION . BRO/KJP MARINE . BRO/KJP


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
WASD2 - 8594900 - Washington, DC 3 mi59 min NW 8 G 12 65°F 65°F1014.6 hPa
BSLM2 - Chesapeake Bay, MD 18 mi77 min N 5.1 66°F 1013 hPa43°F
APAM2 - 8575512 - Annapolis, MD 32 mi59 min WNW 11 G 12 65°F 63°F1013.5 hPa
TPLM2 - Thomas Point, MD 32 mi47 min NNE 7 G 8.9 60°F 60°F1014.9 hPa (-0.4)44°F
44063 - Annapolis 33 mi47 min 16 G 19 61°F 60°F1 ft1015.2 hPa (-0.3)
NCDV2 35 mi59 min NNW 9.9 G 15 65°F 63°F1013.3 hPa
CPVM2 36 mi59 min 62°F 45°F
44062 - Gooses Reef, MD 38 mi47 min 12 G 14 58°F 61°F1 ft1015.3 hPa (-0.6)
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 38 mi59 min NW 8 G 9.9 63°F 1013.9 hPa
FSNM2 38 mi59 min NW 13 G 16 62°F 1013.6 hPa
BLTM2 - 8574680 - Baltimore, MD 39 mi59 min N 8 G 13 64°F 61°F1013.5 hPa
COVM2 - 8577018 - Cove Point LNG Pier, MD 46 mi59 min NW 4.1 G 6 59°F 1014 hPa
SLIM2 - 8577330 - Solomons Island, MD 47 mi59 min E 7 G 8.9 60°F 63°F1013.6 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 mi55 minNW 14 G 1910.00 miPartly Cloudy66°F40°F39%1014.5 hPa
Camp Springs / Andrews Air Force Base, MD9 mi51 minNNW 810.00 miFair65°F42°F43%1014.1 hPa
Fort Belvoir, VA10 mi51 minNNW 610.00 miFair66°F40°F39%1014.8 hPa
College Park Airport, MD12 mi52 minNNW 810.00 miFair64°F37°F37%1014.2 hPa
Fort Meade / Tipton, MD23 mi52 minNW 510.00 miPartly Cloudy63°F43°F49%1014.9 hPa
Gaithersburg - Montgomery County Airport, MD24 mi51 minWNW 11 G 1410.00 miFair64°F41°F43%1016.4 hPa
Washington/Dulles International Airport, DC, VA24 mi55 minWNW 11 G 1910.00 miA Few Clouds65°F39°F39%1014.7 hPa

Link to 5 minute data for KDCA

Wind History from DCA (wind in knots)
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Last 24hrSE7SE10SE8SE7S7S6SW6SW13SW9NW18
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1 day agoNW11
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NW6NW6NW5NW6CalmN5N6W3N4N11S6SW5SW5S7S7S5SE9
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2 days agoN5N5NW6NW9NW7NW8NW5W6W5W6SW3CalmSW3W4E4NW5NW11NW9N10
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Tide / Current Tables for Bellevue, D.C.
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Bellevue
Click for Map
Mon -- 02:27 AM EDT     0.44 feet Low Tide
Mon -- 05:35 AM EDT     Moonrise
Mon -- 06:00 AM EDT     Sunrise
Mon -- 08:23 AM EDT     3.42 feet High Tide
Mon -- 03:12 PM EDT     0.31 feet Low Tide
Mon -- 07:14 PM EDT     Moonset
Mon -- 08:09 PM EDT     Sunset
Mon -- 08:51 PM EDT     2.97 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.20.80.50.511.72.53.13.43.32.92.31.71.10.60.30.511.82.42.832.72.1

Tide / Current Tables for Benning Bridge, D.C.
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Benning Bridge
Click for Map
Mon -- 02:41 AM EDT     0.47 feet Low Tide
Mon -- 05:35 AM EDT     Moonrise
Mon -- 05:59 AM EDT     Sunrise
Mon -- 08:38 AM EDT     3.55 feet High Tide
Mon -- 03:26 PM EDT     0.33 feet Low Tide
Mon -- 07:13 PM EDT     Moonset
Mon -- 08:09 PM EDT     Sunset
Mon -- 09:06 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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1.40.90.60.50.91.62.43.13.53.53.12.51.91.30.80.40.40.91.72.32.93.12.92.4

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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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