Wednesday, March22, 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 7:05AMSunset 7:24PM Wednesday March 22, 2017 8:26 PM EDT (00:26 UTC) Moonrise 2:37AMMoonset 12:54PM Illumination 22% 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
    EDIT      (on/off)   Help
ANZ535 Tidal Potomac From Key Bridge To Indian Head- 731 Pm Edt Wed Mar 22 2017
.small craft advisory in effect until 8 pm edt this evening...
Tonight..N winds 5 to 10 kt. Waves 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. Waves 1 ft.
Sat..SW winds 5 kt. Waves less than 1 ft.
Sat night..SE winds around 5 kt. Waves 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 731 Pm Edt Wed Mar 22 2017
Synopsis for the tidal potomac and md portion of the chesapeake bay.. High pressure will then build from the north, settling across the waters Thursday morning. The high will move offshore Thursday night, allowing a warm front to lift through the area on Friday. A low pressure system may approach the area Sunday. Small craft advisories may be needed on Friday.

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


Area Discussion for - Baltimore, MD/Washington
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
Fxus61 klwx 221858
afdlwx
area forecast discussion
national weather service baltimore md/washington dc
258 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 /through tonight/
High pressure over the great lakes this afternoon will crest
over the forecast area by Thursday morning. That will lead to
decoupling of the wind field (the gradient has already started
to relax) and radiational cooling. The best cooling will occur
in the mountains, where lows will be in the teens. However, the
entire area will be in the 20s by sunrise tomorrow. Ultimately,
the extent of radiational cooling will depend upon when winds
diminish. With dewpoints near 10 above, there is plenty of room
for cooling, and the source of the uncertainty.

Short term /Thursday 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 /19z Wednesday through Monday/
Vfr flight conditions will prevail through the valid TAF period.

Gusty northwest winds are diminishing, with gusts 20-30kt
through sunset. Winds will continue to diminish, with winds less
than 10 kt overnight. Few if any clouds through this period.

Mostly clear/clear skies and light winds will continue through
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 continue to diminish. Will replace all gale warnings with
small craft advisories. The small craft will be able to be
trimmed through the evening. 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 8 pm edt this evening for anz530-
531-538>540.

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

Small craft advisory until 8 pm edt this evening for anz535-
536.

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


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 11 mi39 min NNW 8 G 9.9 44°F 45°F1028.4 hPa
BSLM2 - Chesapeake Bay, MD 28 mi117 min NW 9.9 44°F 1027 hPa10°F
NCDV2 37 mi39 min NNW 5.1 G 6 44°F 47°F1027.9 hPa
APAM2 - 8575512 - Annapolis, MD 41 mi39 min 42°F 1028.1 hPa
TPLM2 - Thomas Point, MD 42 mi27 min N 18 G 21 42°F 44°F5°F
FSNM2 46 mi39 min NNW 19 G 23 41°F 1027.6 hPa
CPVM2 46 mi39 min 43°F 13°F
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 46 mi39 min NNW 17 G 19 42°F 1028.4 hPa
BLTM2 - 8574680 - Baltimore, MD 46 mi39 min N 8.9 G 16 42°F 45°F1028.4 hPa
44062 - Gooses Reef, MD 47 mi27 min N 18 G 19 44°F 44°F2 ft1028.6 hPa (+3.0)

Wind History for Washington, DC
(wind in knots)    EDIT      (on/off)   Help
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
-12
PM
3
PM
4
PM
5
PM
6
PM
7
PM
8
PM
Last
24hr
NW5
G9
--
SW2
SE1
W3
G6
NW4
NW7
G13
NW5
G10
N11
N14
G23
N12
G23
NW14
G22
NW16
G25
NW14
G20
NW14
G24
NW13
G19
NW15
G23
N15
G23
N11
G16
NW13
G18
N15
N8
G16
1 day
ago
SE1
--
SE3
--
SE3
E1
--
NE1
G5
E4
NE2
NE1
G5
NE2
G5
N3
E2
NW2
W4
G7
NW4
W6
NW8
G13
NW8
G16
NW10
G13
NW6
G10
NW3
G7
NW2
2 days
ago
N8
G13
N11
G19
N6
G15
NW8
G16
NW7
G10
NW8
G13
NW4
G9
NW6
G9
NW8
G12
NW4
NW4
G8
NW8
G11
N5
G10
W6
NW6
G11
NW5
NW6
NW4
NW4
NW2
SE2
--

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Fort Belvoir, VA7 mi29 minNNW 510.00 miFair43°F5°F21%1029.1 hPa
Washington/Reagan National Airport, DC, VA11 mi35 minNNW 1410.00 miFair43°F5°F21%1028.9 hPa
Washington/Dulles International Airport, DC, VA15 mi35 minNNW 810.00 miFair41°F3°F20%1029.1 hPa
Manassas, Manassas Regional Airport/Harry P. Davis Field, VA17 mi31 minN 910.00 miFair40°F7°F25%1030.4 hPa
College Park Airport, MD19 mi46 minNNW 9 G 1510.00 miFair39°F3°F22%1028.8 hPa
Camp Springs / Andrews Air Force Base, MD19 mi29 minN 910.00 miFair38°F6°F27%1029 hPa
Quantico Marine Corps Airfield - Turner Field, VA22 mi31 minNNE 1010.00 miFair43°F8°F24%1029.3 hPa
Gaithersburg - Montgomery County Airport, MD24 mi32 minN 310.00 miFair37°F3°F23%1030.1 hPa

Wind History from DAA (wind in knots)
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
2
PM
3
PM
4
PM
5
PM
6
PM
7
PM
8
PM
Last 24hrCalmCalmNW3CalmCalmCalmCalmNW8NW7N12
G19
NW15
G25
NW19
G27
NW16
G27
NW19
G27
N11
G28
NW12
G18
NW17
G25
N13
G23
NW15
G22
NW13
G22
N11
G18
NW13
G20
NW12
G18
N5
1 day agoCalmSE3CalmCalmCalmCalmCalmCalmCalmCalmSE3Calm33NW4N65NW9NW12
G17
NW8
G17
W11NW9NW7Calm
2 days ago5NW7NW7NW8NW7NW6NW4NW5NW5CalmCalmW36N63CalmCalmNW8NW8CalmCalmCalmCalmCalm

Tide / Current Tables for Chain Bridge, one mile below, Washington, D.C.
   EDIT   RT Ports Option   Weekend mode (on/off)   (on/off)   Help   One Week of Data
Chain Bridge
Click for Map
Wed -- 03:36 AM EDT     Moonrise
Wed -- 04:41 AM EDT     2.65 feet High Tide
Wed -- 07:08 AM EDT     Sunrise
Wed -- 10:35 AM EDT     0.47 feet Low Tide
Wed -- 01:53 PM EDT     Moonset
Wed -- 04:45 PM EDT     2.81 feet High Tide
Wed -- 07:22 PM EDT     Sunset
Wed -- 11:41 PM EDT     0.49 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.71.31.92.42.62.62.41.91.30.80.50.50.71.21.92.52.82.82.62.21.61.10.70.5

Tide / Current Tables for Chain Bridge, D.C.
   EDIT      (on/off)   Help   One Week of Data
Chain Bridge
Click for Map
Wed -- 03:36 AM EDT     Moonrise
Wed -- 04:48 AM EDT     2.70 feet High Tide
Wed -- 07:08 AM EDT     Sunrise
Wed -- 10:44 AM EDT     0.44 feet Low Tide
Wed -- 01:53 PM EDT     Moonset
Wed -- 04:53 PM EDT     2.86 feet High Tide
Wed -- 07:22 PM EDT     Sunset
Wed -- 11:46 PM EDT     0.46 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.71.21.92.42.62.72.521.30.80.50.40.61.11.82.52.82.92.72.31.71.20.70.5

Weather Map and Satellite Images
       (on/off)   Help
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 (20,4,5,8)
      (on/off)   Help

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

Ad by Google

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.