Monday, November20, 2017 L-36.com


Marine Weather and Tides
Woodburn, VA

Version 3.4
What's New / NOTES
6/25/2017 - NOAA is having a major issue that impact the 7 day forecast load times. Many users are reporting problems. The issue has been reported.
5/23/2017 - Worked with NOAA again to speed up the 7 day forecast load times. Thanks to them for being responsive.
5/19/2016 - There were issues with the 3 day airport observation history. I switched to another data source. Let me know if you see any issues with the data feeds.

Sunrise 6:56AMSunset 4:52PM Monday November 20, 2017 1:02 AM EST (06:02 UTC) Moonrise 8:38AMMoonset 6:46PM Illumination 2% Phase: Waxing Crescent; Moon at 1 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- 1231 Am Est Mon Nov 20 2017
.small craft advisory in effect until 10 am est this morning...
Overnight..W winds 15 kt with gusts to 20 kt. Waves 1 ft.
Mon..SW winds 10 to 15 kt. Gusts up to 20 kt. Waves 1 ft.
Mon night..SW winds 5 kt. Waves less than 1 ft.
Tue..S winds 5 to 10 kt. Waves 1 ft.
Tue night..SW winds 5 to 10 kt. Waves 1 ft. A chance of showers.
Wed..NW winds 5 to 10 kt. Waves 1 ft.
Wed night..N winds 5 to 10 kt. Waves 1 ft.
Thu..W winds around 5 kt. Waves 1 ft or less.
Fri..SW winds around 5 kt. Waves 1 ft.
ANZ500 1231 Am Est Mon Nov 20 2017
Synopsis for the tidal potomac and md portion of the chesapeake bay.. High pressure will build to our south through Monday. The high will move offshore Tuesday and a cold front will pass through late Tuesday night into Wednesday. High pressure will return for the second half of the week. A small craft advisory may be needed for portions of the waters Tuesday through Wednesday night.

7 Day Forecast for Marine Location Near Woodburn, VA
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location: 38.83, -77.23     debug


Area Discussion for - Baltimore, MD/Washington
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Fxus61 klwx 200210
afdlwx
area forecast discussion
national weather service baltimore md washington dc
910 pm est Sun nov 19 2017

Synopsis
High pressure will build to our south tonight through Monday
night. The high will move offshore Tuesday and a cold front will
pass through Tuesday night into Wednesday. High pressure will
build back overhead later Wednesday through thanksgiving day.

Coastal low pressure will likely move well out to sea Friday and
a cold front will pass through Saturday.

Near term through Monday
Surface low pressure is racing toward the canadian maritimes
this evening while high pressure is centered near memphis. Water
vapor loops show the mid upper level shortwave over top of the
area, which is allowing stratocumulus clouds to persist. Wind
gusts have diminished compared to the daylight hours, but random
gustiness will remain possible through the night due to the
cold air advection and pressure rises.

Pbz radar shows snow showers continuing to advect into the
appalachian mountains. So far, snow observations we've received
have not amounted to much, but due to the targeted nature and
intensity of the convective elements, will allow the winter
weather advisory to continue. Traffic cameras indicate roads are
becoming snow covered in garrett county, so that's likely the
case further south as well. A few flurries and sprinkles are
making it east of the mountains but will have little impact with
temperatures in the upper 30s to around 40.

Overnight, snow showers along the allegheny front should
quickly wind down behind the shortwave and stratocumulus should
clear. Temps will bottom out below freezing in most of the
area, except the warmest urban centers and along the warmer
large bodies of water (potomac chesapeake).

On Monday, high pressure should continue building eastward,
reaching eastern north carolina by day's end. This will cause
winds to shift from northwest to southwest, but warm advection
will be slow, so we still expect Monday to be chilly, with highs
struggling to reach 50. The lighter winds and greater sunshine
under a shortwave ridge will likely make Monday feel a little
more comfortable, especially in the afternoon.

Short term Monday night through Tuesday night
High pressure will shift east off the coast Monday night and
Tuesday, allowing southwesterly flow to dominate. While Monday
night looks radiational thanks to diminishing winds and clear
skies near the center of the high, by Tuesday sunshine and
warmer air aloft will translate to warmer surface temps, with
most places rebounding 5-10 degrees above Monday's expected
highs.

Tuesday night, a cold front will approach from the northwest
while a shortwave will spawn a coastal low near the outer banks.

Still some question regarding how far west the rain shield from
this low makes it, but most guidance now shows rain reaching
southern maryland, and a fair number have rain reaching
baltimore and washington proper. Thus, have chance pops for the
big cities and likely in southern md. Further west, odds are
considerably lower. It should overall be a milder night thanks
to the warm advection ahead of the cold front combined with
increased cloud cover, with lows mostly above freezing.

Long term Wednesday through Sunday
High pressure will build into the region Wednesday through
Friday night. Dry conditions expected with plenty of sunshine
each day and mainly clear skies at night. Despite the daytime
sunshine, temperatures each period will be about 5 to 7 degrees
below average with highs in the upper 40s to near 50 and lows in
the upper 20s to near 30.

A storm system over eastern canada will bring a cold front
toward and across the mid-atlantic Saturday and Saturday night.

There is a chance for a few rain showers along the mason-dixon
region Saturday with a chance of rain and snow showers in the
appalachians and along the mason-dixon regions Saturday night.

Temperatures will be closer to average.

A gusty northwest wind will usher in cold air into the region
Sunday. With that, a chance of snow showers are expected in the
appalachian mountains. Below average temperatures expected to
retake the region.

Aviation 02z Monday through Friday
Vfr overall through the TAF period. There could be a stray
sprinkle or flurry this evening but with little impact. Winds
have generally diminished, but a few random gusts to 20 kt
remain possible through the night. Winds may return to the 20
knot range during the day Monday. Tuesday night is the only real
chance of sub-VFR as a low pressure system could bring a bit
of rain, which may reduce CIGS and vis for a time. Still
uncertain just how far west this precip gets.

Vfr conditions Wednesday through Thursday night. Winds
northwest 5 to 10 knots Wednesday. Winds northwest around 5
knots Wednesday night. Winds becoming light and variable
Thursday and Thursday night.

Marine
Winds have diminished substantially, with most observations
being 20 knots or less. Will continue the small craft advisory
for all waters through the night, as gustiness may increase at
times due to cold air advection and pressure rises. Am not
thinking these factors will be strong enough to pull down any
gale force gusts, though a few gusts around 30 knots remain
possible on the more open waters.

Sca continues most waters through Monday as high pressure
shifts east to our south. However, winds may diminish across the
southern half of the waters by midday. Winds probably go sub
sca on Monday night but may go back to SCA Tuesday ahead of the
next cold front, which passes late Tuesday night.

Sca possible behind cold front Wednesday, may be diminishing
Wednesday night. Winds light and variable Thursday and Thursday
night.

Lwx watches warnings advisories
Dc... None.

Md... None.

Va... None.

Wv... Winter weather advisory until 11 pm est this evening for
wvz501-505.

Marine... Small craft advisory until 6 pm est Monday for anz530>534-
537>543.

Small craft advisory until 10 am est Monday for anz535-536.

Synopsis... Rcm
near term... Ads rcm
short term... Rcm
long term... Klw
aviation... Ads rcm klw
marine... Ads rcm klw


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
WASD2 - 8594900 - Washington, DC 11 mi44 min NW 7 G 8.9 43°F 49°F1015.7 hPa
BSLM2 - Chesapeake Bay, MD 28 mi92 min NW 6 44°F 1015 hPa29°F
NCDV2 37 mi44 min WSW 4.1 G 5.1 44°F 51°F1014.7 hPa
APAM2 - 8575512 - Annapolis, MD 41 mi44 min 43°F 1014.3 hPa
44063 - Annapolis 42 mi32 min NNW 14 G 21 44°F 1014.9 hPa
TPLM2 - Thomas Point, MD 42 mi62 min WNW 18 G 20 44°F 53°F
CPVM2 46 mi44 min 44°F 25°F
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 46 mi44 min W 17 G 19 43°F 1014.1 hPa
BLTM2 - 8574680 - Baltimore, MD 46 mi44 min NW 7 G 15 43°F 55°F1014 hPa
44062 - Gooses Reef, MD 47 mi32 min NNW 16 G 21 46°F 1009.1 hPa

Wind History for Washington, DC
(wind in knots)    EDIT      (on/off)   Help
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Last
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S11
G16
SW7
G15
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G17
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G25
NW16
G24
NW7
G17
NW11
G21
NW14
G28
NW10
G26
NW16
G22
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G27
W12
G25
NW12
G22
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G27
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G20
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G18
NW6
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G13
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S1
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G11
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G16
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NW5
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NW6
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G16
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G13
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N6
G10
NW4
G15
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G10
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G8
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S1
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Fort Belvoir, VA7 mi66 minWNW 710.00 miOvercast44°F26°F51%1015.6 hPa
Washington/Reagan National Airport, DC, VA11 mi70 minNW 510.00 miMostly Cloudy43°F28°F56%1015.2 hPa
Washington/Dulles International Airport, DC, VA15 mi70 minWNW 710.00 miMostly Cloudy41°F28°F60%1015 hPa
Manassas, Manassas Regional Airport/Harry P. Davis Field, VA17 mi66 minWNW 1010.00 miA Few Clouds43°F24°F47%1016.6 hPa
College Park Airport, MD19 mi76 minWNW 10 G 1610.00 miPartly Cloudy41°F26°F56%1014.6 hPa
Camp Springs / Andrews Air Force Base, MD19 mi66 minWNW 910.00 miOvercast43°F26°F52%1015.3 hPa
Quantico Marine Corps Airfield - Turner Field, VA22 mi4.1 hrsNNW 3 miOvercast46°F27°F47%1014.1 hPa
Gaithersburg - Montgomery County Airport, MD24 mi66 minW 10 G 1710.00 miMostly Cloudy39°F26°F60%1017.9 hPa

Wind History from DAA (wind in knots)
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Last 24hrS5S6S8S8
G14
W9
G17
NW26
G37
W22
G28
NW12
G29
NW19
G28
W25
G31
W21
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G34
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W10NW8W5NW5NW8NW7NW7
1 day agoCalmCalmCalmCalmCalmSE3SE3SE6S7S9
G15
S11
G18
S11
G16
S11
G20
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G17
S9SE5SE5SE6S5S9
G15
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2 days agoW10W9
G17
W5W6NW6NW3NW8NW5NW11
G19
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G17
NW10NW9
G15
NW7NW9NW6NW7CalmCalmCalmCalmCalmCalmCalmCalm

Tide / Current Tables for Chain Bridge, one mile below, Washington, D.C.
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Chain Bridge
Click for Map
Mon -- 04:06 AM EST     -0.02 feet Low Tide
Mon -- 06:56 AM EST     Sunrise
Mon -- 08:37 AM EST     Moonrise
Mon -- 09:38 AM EST     2.76 feet High Tide
Mon -- 03:54 PM EST     0.05 feet Low Tide
Mon -- 04:50 PM EST     Sunset
Mon -- 06:45 PM EST     Moonset
Mon -- 09:44 PM EST     3.08 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.81.20.60.2-00.20.81.72.32.72.72.31.710.50.20.10.311.92.633.12.7

Tide / Current Tables for Chain Bridge, D.C.
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Chain Bridge
Click for Map
Mon -- 04:13 AM EST     0.02 feet Low Tide
Mon -- 06:57 AM EST     Sunrise
Mon -- 08:37 AM EST     Moonrise
Mon -- 09:44 AM EST     2.73 feet High Tide
Mon -- 04:01 PM EST     0.09 feet Low Tide
Mon -- 04:50 PM EST     Sunset
Mon -- 06:45 PM EST     Moonset
Mon -- 09:50 PM EST     3.05 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.91.30.70.300.20.81.62.22.62.72.41.81.10.60.20.10.30.91.82.52.932.8

Weather Map and Satellite Images
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Weather Map
wmap_A
IR Satellite Image from GEOS
east_satellite

GOES Local Image of Mid-Atlantic    EDIT
Geos

Wind Forecast for Baltimore, MD/Washington (1,6,7,8)
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Ground Weather Radar Station Sterling, VA
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weather_mapweather_map weather_map

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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.