Thursday, March23, 2017 L-36.com


Marine Weather and Tides
Woodburn, VA

Version 3.4
What's New / NOTES
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.
3/12/2015 - Added section for Gulf current for users in the GMZ marine zones.
This was requested by a user. If you have requests, please let me know.

Sunrise 7:04AMSunset 7:25PM Thursday March 23, 2017 2:13 AM EDT (06:13 UTC) Moonrise 3:21AMMoonset 1:51PM Illumination 20% Phase: Waning Crescent; Moon at 25 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- 154 Am Edt Thu Mar 23 2017
.small craft advisory in effect Friday afternoon...
Overnight..N winds 5 kt. Waves less than 1 ft.
Thu..S winds around 5 kt. Waves 1 ft.
Thu night..S winds 5 kt. Waves less than 1 ft.
Fri..S winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft.
Fri night..SW winds 5 to 10 kt. Gusts up to 20 kt in the evening. Waves 1 ft.
Sat..SW winds 5 to 10 kt. Waves 1 ft.
Sat night..S winds 5 kt. Waves less than 1 ft.
Sun..SE winds 5 kt. Waves less than 1 ft. A chance of showers through the day...then showers likely through the night.
Mon..E winds around 5 kt. Waves 1 ft. Showers likely in the morning...then a chance of showers through the night.
ANZ500 154 Am Edt Thu Mar 23 2017
Synopsis for the tidal potomac and md portion of the chesapeake bay.. High pressure will build overhead this morning. The high will move offshore tonight, allowing a warm front to lift through the area on Friday. A low pressure system may approach the area Sunday.

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 230038
afdlwx
area forecast discussion
national weather service baltimore md/washington dc
838 pm edt Wed mar 22 2017

Synopsis
High pressure will build across the area tonight, and move
offshore Thursday night. A warm front will cross the region
Friday. Low pressure may affect the area Sunday.

Near term /until 6 am Thursday morning/
High pressure will build overhead tonight. Mainly clear
skies... Light winds and dry air will provide a great setup for
radiational cooling. Therefore... Leaned toward colder guidance
for rural areas overnight. Min temps will range from the teens
in the colder valleys and rural areas to the mid and upper 20s
in downtown washington and baltimore.

Short term /6 am Thursday morning through Friday night/
Warm advection will commence by Thursday afternoon, and the axis
of the high will move offshore by Thursday night. It is less
certain whether the warming will be realized at ground level
during the day. Therefore, forecast highs will be similar to
today. The warming will begin to mix to the surface Thursday
night. The ECMWF has been (and continues to be) much wetter than
other guidance late Thursday night into early Friday morning near
a warm front. Given warming aloft, that suggests a freezing
rain threat. The ECMWF is alone in this solution; other guidance
is all dry. Have reduced pops a pinch (have 20-30% in database).

Am reluctant to remove pops outright, but at the same time am
skeptical whether this will pose an impact.

Forecast area will be on the warm side of the upper ridge on
Friday. Highs near 60; lows 45-50.

Long term /Saturday through Wednesday/
Warm southerly flow over our area as a high pressure sits
offshore- will allow for well above normal temperatures on
Saturday... Reaching the 70s for most locations... 60s
otherwise.

Backdoor cold front pushes south Saturday night into Sunday and
stalls near or above our CWA into Monday as low pressure approaches
the southern great lakes. Pops will be increasing as this low
continues to move ene through the front Sunday into Monday.

There seems to be a drier period sometime Monday night into early
Tuesday before a cold front pushes through the area Tuesday into
Tuesday night as pops increases. Dry conditions return on Wednesday.

High temperatures Sunday into Tuesday will be in the 50s and 60s,
and in the 40s on Wednesday behind the front.

Aviation /01z Thursday through Monday/
Vfr flight conditions will prevail through the valid TAF period.

Winds will continue to diminish overnight with speeds less than
10 knots expected. A thin deck of high clouds will overspread
the terminals Thursday.

South/southwesterly flow Thursday night into Friday. Clouds will
overspread during this period. Do not anticipate flight
restrictions during this period. Precipitation should remain
north of the terminals. There is a slight chance that precip
could move in before all cold air departs-- this would affect
only mrb. Have low confidence that this would occur.

Dry/vfr and warm conditions expected on Saturday. A front
pushes south and stalls over our area Sunday and increases
probability of precip over our region into Monday with possible
sub-vfr periods.

Marine
Winds will continue to gradually diminish over the waters
tonight. A small craft advisory remains in effect until early
Thursday morning for the middle portion of the bay and the lower
tidal potomac river. Winds will be light Thursday and Thursday
night. Southerly flow will increase again Friday.

Dry and warm conditions expected on Saturday. A front pushes
south and stalls over our area Sunday and increases probability
of precip over our region into Monday with possible. Winds are
expected to remain below the SCA threshold trough this period.

Lwx watches/warnings/advisories
Dc... None.

Md... None.

Va... None.

Wv... None.

Marine... Small craft advisory until 4 am edt Thursday for anz532>534-
537-541>543.

Synopsis... Hts
near term... Bjl/hts
short term... Hts
long term... Imr
aviation... Bjl/imr/hts
marine... Bjl/imr/hts


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
WASD2 - 8594900 - Washington, DC 11 mi44 min NNE 6 G 8.9 37°F 45°F1032.5 hPa
BSLM2 - Chesapeake Bay, MD 28 mi164 min N 2.9 33°F 1031 hPa17°F
NCDV2 37 mi44 min N 2.9 G 6 36°F 47°F1032 hPa
APAM2 - 8575512 - Annapolis, MD 41 mi44 min 34°F 1032.5 hPa
TPLM2 - Thomas Point, MD 42 mi74 min NNE 18 G 20 35°F 43°F10°F
FSNM2 46 mi44 min NE 7 G 8.9 32°F 1032.3 hPa
CPVM2 46 mi44 min 35°F 14°F
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 46 mi44 min NE 7 G 8 32°F 1033.2 hPa
BLTM2 - 8574680 - Baltimore, MD 46 mi44 min ENE 6 G 8.9 33°F 44°F1032.7 hPa
44062 - Gooses Reef, MD 47 mi24 min E 16 G 19 35°F 1032.8 hPa

Wind History for Washington, DC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Fort Belvoir, VA7 mi16 minN 410.00 miFair33°F5°F31%1033.2 hPa
Washington/Reagan National Airport, DC, VA11 mi22 minNNE 910.00 miFair35°F7°F31%1032.9 hPa
Washington/Dulles International Airport, DC, VA15 mi22 minNNW 710.00 miPartly Cloudy32°F6°F33%1032.8 hPa
Manassas, Manassas Regional Airport/Harry P. Davis Field, VA17 mi18 minN 510.00 miFair32°F10°F40%1034.2 hPa
College Park Airport, MD19 mi33 minN 010.00 miFair30°F8°F40%1032.8 hPa
Camp Springs / Andrews Air Force Base, MD19 mi76 minNE 710.00 miFair30°F7°F39%1032.8 hPa
Quantico Marine Corps Airfield - Turner Field, VA22 mi18 minNNE 910.00 miFair37°F10°F34%1033.2 hPa
Gaithersburg - Montgomery County Airport, MD24 mi19 minN 010.00 miFair28°F1°F31%1033.9 hPa

Wind History from DAA (wind in knots)
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Last 24hrCalmNW8NW7N12
G19
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NW16
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G28
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N5NW6N7NW3N3N3N4
1 day agoCalmCalmCalmCalmSE3Calm33NW4N65NW9NW12
G17
NW8
G17
W11NW9NW7CalmCalmCalmNW3CalmCalmCalm
2 days agoNW4NW5NW5CalmCalmW36N63CalmCalmNW8NW8CalmCalmCalmCalmCalmCalmSE3CalmCalmCalmCalm

Tide / Current Tables for Chain Bridge, one mile below, Washington, D.C.
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Chain Bridge
Click for Map
Thu -- 04:20 AM EDT     Moonrise
Thu -- 05:35 AM EDT     2.71 feet High Tide
Thu -- 07:06 AM EDT     Sunrise
Thu -- 11:43 AM EDT     0.45 feet Low Tide
Thu -- 02:50 PM EDT     Moonset
Thu -- 05:44 PM EDT     2.85 feet High Tide
Thu -- 07:23 PM EDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.50.81.322.42.72.72.41.81.20.80.50.50.71.21.92.52.82.82.62.11.61.10.7

Tide / Current Tables for Chain Bridge, D.C.
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Chain Bridge
Click for Map
Thu -- 04:20 AM EDT     Moonrise
Thu -- 05:41 AM EDT     2.76 feet High Tide
Thu -- 07:06 AM EDT     Sunrise
Thu -- 11:49 AM EDT     0.42 feet Low Tide
Thu -- 02:50 PM EDT     Moonset
Thu -- 05:51 PM EDT     2.91 feet High Tide
Thu -- 07:23 PM EDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.50.71.322.42.72.72.51.91.30.80.50.40.61.11.92.52.82.92.72.21.61.10.7

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 (2,6,7,8)
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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.