Monday, December9, 2019
Privacy Policy
L-36.com


Marine Weather and Tides
Alexandria, VA

Version 3.4
NOTICE
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.
6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

Sunrise 7:13AMSunset 4:47PM Monday December 9, 2019 1:41 PM EST (18:41 UTC) Moonrise 3:22PMMoonset 4:23AM Illumination 95% Phase: Waxing Gibbous; Moon at 13 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
    EDIT      (on/off)   Help
ANZ535 Tidal Potomac From Key Bridge To Indian Head- 1239 Pm Est Mon Dec 9 2019
.small craft advisory in effect from 9 pm est this evening through late tonight...
This afternoon..S winds 10 kt. Waves 1 ft. Rain. Vsby 1 to 3 nm.
Tonight..SW winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft. Scattered showers.
Tue..W winds 5 to 10 kt. Waves 1 ft. Showers.
Tue night..NW winds 10 to 15 kt with gusts to 20 kt...becoming N 5 kt after midnight. Waves 1 ft. Rain.
Wed..NW winds 5 kt. Waves less than 1 ft. Rain.
Wed night..NW winds 5 kt. Waves less than 1 ft.
Thu..NE winds around 5 kt. Waves 1 ft.
Fri..E winds around 5 kt. Waves 1 ft. Showers likely through the night.
ANZ500 1239 Pm Est Mon Dec 9 2019
Synopsis for the tidal potomac and md portion of the chesapeake bay.. Low pressure over the upper midwest will move into the great lakes this afternoon, then move into southeastern canada tonight. This low will drag its trailing cold front through the region Tuesday into Wednesday. High pressure will follow Wednesday night through Thursday. Small craft advisories will likely be needed Tuesday evening into Wednesday.


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


Area Discussion for - Baltimore, MD/Washington
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
FXUS61 KLWX 091445 AFDLWX

Area Forecast Discussion National Weather Service Baltimore MD/Washington DC 945 AM EST Mon Dec 9 2019

SYNOPSIS. Low pressure will develop over the central United States and lift into the Great Lakes today. A warm front developing east of this area of low pressure over the Carolinas is expected to lift northward across the Mid-Atlantic today. The aforementioned low will drag its trailing cold front through the region Tuesday into Wednesday. Strong Arctic high pressure will build from the Great Lakes toward the Mid-Atlantic Wednesday night through Thursday night, then shift offshore of New England as low pressure develops over and approaches from the southeastern United States.

NEAR TERM /THROUGH TONIGHT/. A steady rain has developed over much of the area, just about to the I-95 corridor as of 9:30AM. This rain will continue to overspread the rest of the Mid-Atlantic through midday (except perhaps a touch less widespread/steady over southern Maryland, further from upper forcing).

As a lead shortwave impulse in the 700-500 hPa layer pushes northeast by nightfall, the steadier rain will come to an end. The warm front currently positioned to our south should subsequently move northward, with rain becoming more spotty and showery in nature through tonight.

SHORT TERM /TUESDAY THROUGH WEDNESDAY NIGHT/. Surface cold front will move across our area on Tuesday and showers will redevelop into Tuesday night. The front should be east of our area by Tuesday evening but the upper jet dynamics and a mid level energy ahead of a trough will allow for anafrontal precipitation. Cold and dry air advection behind the front will have an impact on the p-type on Tuesday night. A changeover from rain to snow could occur Tuesday night, assuming there is still enough moisture in the column.

If things come together, the most likely areas for snow accumulations are over higher elevation. Highest amounts are about 5 inches at the ridgetops, with up to 3 inches elsewhere (see winter weather website). This of course will depend if cold air moves in fast enough, so there is still some uncertainty with this.

Precipitation will end on Wednesday as Arctic high pressure builds in from the west on Wednesday into the night.

LONG TERM /THURSDAY THROUGH SUNDAY/. Guidance is in relatively good agreement, better than last night, regarding the end of week and weekend. High pressure likely dominates on Thursday, with chilly temperatures but dry conditions. By Friday, low pressure developing near the Gulf coast may start to spread precipitation into the region, but this is more likely Friday night. With the chilly air mass in place, some mixed precipitation, perhaps even freezing rain, will be possible mainly west of the Blue Ridge. By Saturday, the low lifts northward to our west, likely scouring out the cold air and bringing temperatures back above normal across much of the area, though rain showers will continue. As low pressure then moves further away to the north and east by Sunday, drier weather should return, but with little cold air behind the system, temperatures look more likely to remain on the plus side of normal.

AVIATION /15Z MONDAY THROUGH FRIDAY/. Fog near DCA/BWI/MTN lifting as of 15Z, but will soon be followed by vsby reductions in rain (this will affect all terminals today, steadiest north of CHO). CIGs look IFR/LIFR much of today as well with strong low level moist advection just above a surface temperature inversion. LLWS is likely until 00-03Z this evening as LLJ strengthens to 40+ kts at 2 kft. Surface winds out of the south may gust to 20 kts this evening.

A lull in precipitation is expected tonight, but it may remain sub-VFR through much of the night (though conditions may lift after midnight as the warm front lifts north, am skeptical as to just how quickly/if conditions return to VFR). Precipitation will return again Tuesday, most likely after 15Z as a cold front moves through with sub-VFR conditions highly likely during this time. Precipitation may linger through early Wednesday, and a changeover to snow on Tuesday night is expected, with any appreciable accums most likely for the MRB terminal.

High pressure will build in Wednesday, allowing for VFR conditions to return by around or shortly after midday. NW winds will increase and become gusty.

VFR conditions expected Thursday. However, uncertainty exists Friday as some guidance indicates a low pressure may try to lift northward into the region, bringing potential for mixed precipitation.

MARINE. SCA this afternoon for mid Chesapeake Bay/lower tidal Potomac, expanding northward tonight into tomorrow as low level stability decreases and winds mix down a little more readily. After a potential lull Tuesday, confidence is high on winds increasing out of the northwest behind the front Tuesday night into Wednesday.

Winds likely drop below SCA levels by Thursday as high pressure builds in. Friday, some uncertainty exists as low pressure may lift northward into the region.

LWX WATCHES/WARNINGS/ADVISORIES. DC . None. MD . None. VA . None. WV . None. MARINE . Small Craft Advisory from 6 PM this evening to 6 AM EST Tuesday for ANZ530>532-538>540-542. Small Craft Advisory from 1 PM this afternoon to 1 PM EST Tuesday for ANZ534-537-543. Small Craft Advisory from 1 PM this afternoon to 6 AM EST Tuesday for ANZ533-541.

SYNOPSIS . RCM NEAR TERM . IMR/DHOF SHORT TERM . IMR LONG TERM . RCM AVIATION . IMR/RCM/DHOF MARINE . IMR/RCM/DHOF


Weather Reporting Stations
   EDIT       (on/off)   Help   NOTE: Click on distance to see the station location on a map
Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
WASD2 - 8594900 - Washington, DC 3 mi54 min S 7 G 8 45°F 44°F1015.8 hPa
BSLM2 - Chesapeake Bay, MD 18 mi132 min S 4.1 47°F 1017 hPa
APAM2 - 8575512 - Annapolis, MD 32 mi54 min 47°F 1015 hPa
TPLM2 - Thomas Point, MD 32 mi42 min SE 12 G 12 46°F 45°F1016.3 hPa (-3.9)46°F
44063 - Annapolis 33 mi36 min SW 7.8 G 9.7 45°F 45°F1015.9 hPa
NCDV2 35 mi60 min S 1.9 G 4.1
CPVM2 36 mi60 min 46°F
44062 - Gooses Reef, MD 38 mi42 min SSW 3.9 G 3.9 47°F 1016.6 hPa
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 38 mi54 min S 5.1 G 6 46°F 1015.5 hPa
BLTM2 - 8574680 - Baltimore, MD 39 mi60 min SSW 1 G 4.1 46°F 45°F1015.2 hPa
SLIM2 - 8577330 - Solomons Island, MD 47 mi54 min SW 5.1 G 6 48°F 47°F1015.7 hPa

Wind History for Washington, DC
(wind in knots)    EDIT      (on/off)   Help
2
PM
3
PM
4
PM
5
PM
6
PM
7
PM
8
PM
9
PM
10
PM
11
PM
12
AM
1
AM
2
AM
3
AM
4
AM
5
AM
6
AM
7
AM
8
AM
9
AM
10
AM
11
AM
12
PM
1
PM
Last
24hr
S7
S8
S5
S1
SE1
SE4
W1
S1
SE5
G10
S6
S4
SE2
SE3
W1
G7
NW3
--
S2
S3
S4
G7
S6
S6
S7
S6
S6
G9
1 day
ago
W7
G11
W7
NW7
NW4
G7
NW3
W3
N2
SW1
SE1
--
--
NE1
W1
SW1
SE1
--
--
--
--
SW1
S3
S3
SW7
S6
2 days
ago
S6
SW5
G8
SW2
G5
S2
SE1
S1
NW2
G6
NW5
SE1
N10
G20
N9
G15
N6
G13
N7
G13
N6
G11
N6
G11
N4
G10
N3
G9
NE2
G5
N3
N3
G6
N3
G7
W5
NW5
G12
NW6
G12

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports. Follow links for more data.
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Washington/Reagan National Airport, DC, VA2 mi50 minS 83.00 miRain Fog/Mist46°F44°F93%1015.7 hPa
Camp Springs / Andrews Air Force Base, MD9 mi3.8 hrsSW 87.00 miLight Rain46°F45°F99%1019.8 hPa
Fort Belvoir, VA10 mi3.8 hrsSSE 38.00 miLight Rain45°F43°F94%1019.6 hPa
College Park Airport, MD12 mi66 minS 57.00 miOvercast45°F43°F93%1015.6 hPa
Fort Meade / Tipton, MD23 mi69 minSSW 34.00 miOvercast45°F44°F100%1016.9 hPa
Gaithersburg - Montgomery County Airport, MD24 mi46 minS 45.00 miRain Fog/Mist44°F43°F96%1016.5 hPa
Washington/Dulles International Airport, DC, VA24 mi50 minSSW 102.00 miRain Fog/Mist42°F39°F92%1015.2 hPa

Link to 5 minute data for KDCA

Wind History from DCA (wind in knots)
2
PM
3
PM
4
PM
5
PM
6
PM
7
PM
8
PM
9
PM
10
PM
11
PM
12
AM
1
AM
2
AM
3
AM
4
AM
5
AM
6
AM
7
AM
8
AM
9
AM
10
AM
11
AM
12
PM
1
PM
Last 24hrS8S10S6S3S4SE5S4SW4SE9S6S5S3CalmSE6SW3W4S4S5S6S6S8S9S7S8
1 day agoN56NW6NW6W6NW5N5E4NE4CalmNE3CalmNE3NE4CalmCalmCalmCalmCalmCalmS3S6S6S8
2 days agoSW8SW9SW8S4SW5N5NW6NW10NW7NW19
G24
N12NW11N14
G20
N10N7N8N8N7CalmN7N6CalmNW7Calm

Tide / Current Tables for Bellevue, D.C.
   EDIT   Weekend mode (on/off)   (on/off)   Help   One Week of Data
Bellevue
Click for Map
Mon -- 12:17 AM EST     0.09 feet Low Tide
Mon -- 04:23 AM EST     Moonset
Mon -- 06:02 AM EST     2.50 feet High Tide
Mon -- 07:14 AM EST     Sunrise
Mon -- 12:09 PM EST     -0.02 feet Low Tide
Mon -- 03:21 PM EST     Moonrise
Mon -- 04:46 PM EST     Sunset
Mon -- 06:15 PM EST     2.85 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

12
am
1
am
2
am
3
am
4
am
5
am
6
am
7
am
8
am
9
am
10
am
11
am
12
pm
1
pm
2
pm
3
pm
4
pm
5
pm
6
pm
7
pm
8
pm
9
pm
10
pm
11
pm
0.10.20.71.422.32.52.31.81.10.50.1-00.10.61.42.12.62.82.72.31.71.10.6

Tide / Current Tables for Benning Bridge, D.C.
   EDIT      (on/off)   Help   One Week of Data
Benning Bridge
Click for Map
Mon -- 12:31 AM EST     0.10 feet Low Tide
Mon -- 04:23 AM EST     Moonset
Mon -- 06:17 AM EST     2.59 feet High Tide
Mon -- 07:14 AM EST     Sunrise
Mon -- 12:23 PM EST     -0.02 feet Low Tide
Mon -- 03:21 PM EST     Moonrise
Mon -- 04:45 PM EST     Sunset
Mon -- 06:30 PM EST     2.96 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

12
am
1
am
2
am
3
am
4
am
5
am
6
am
7
am
8
am
9
am
10
am
11
am
12
pm
1
pm
2
pm
3
pm
4
pm
5
pm
6
pm
7
pm
8
pm
9
pm
10
pm
11
pm
0.10.10.51.21.92.42.62.521.30.70.2000.41.222.62.92.92.51.91.30.7

Weather Map
       (on/off)   Help Weather Map
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 (13,3,4,5)
      (on/off)   Help

Ground Weather Radar Station Sterling, VA
   (on/off)   Help
weather_mapweather_map weather_map

Ad by Google

Cookie Policy:
This webiste uses cookies to save your settings. No personal information is saved. You can disable cookies in your browser if you like but it is not recommended for this site. I do not sell cookies. Go to a bakery for that. In fact I do not sell anything. To disable cookies from L-36.com, please refer to the Help button in your browser.
Privacy Policy:
I do not sell or share any user data or anything else for that matter. I do not keep site logs longer than I need to to keep bad actors off the site. Basically, I delete them after looking at them. If you are subject to CCPA, Google ads on this site will not be based on your past behavior so you will likely not see an ad for a lawn mower just because you looked for one at a big box website. I do not believe this site is subject to CCPA but I am doing what I can to follow the guidelines anyway.
Disclaimer:
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 numerious 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.