Sunday, October22, 2017 L-36.com


Marine Weather and Tides
Kings Park, 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 7:25AMSunset 6:21PM Sunday October 22, 2017 6:40 PM EDT (22:40 UTC) Moonrise 8:56AMMoonset 7:28PM Illumination 8% Phase: Waxing Crescent; Moon at 3 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- 432 Pm Edt Sun Oct 22 2017
.small craft advisory in effect from Monday evening through late Monday night...
Rest of this afternoon..SE winds 10 kt. Waves 1 ft.
Tonight..SE winds 5 to 10 kt. Waves 1 ft. Patchy fog. Vsby 1 to 3 nm.
Mon..SE winds 5 to 10 kt. Waves 1 ft. Patchy fog. Vsby 1 to 3 nm.
Mon night..SE winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft. Showers.
Tue..S winds 10 to 15 kt. Gusts up to 20 kt in the morning. Waves 1 ft. Showers likely.
Tue night..W winds 5 kt. Waves less than 1 ft.
Wed..NW winds 5 kt. Waves less than 1 ft.
Thu..S winds around 5 kt. Waves 1 ft.
ANZ500 432 Pm Edt Sun Oct 22 2017
Synopsis for the tidal potomac and md portion of the chesapeake bay.. High pressure will remain offshore through Monday. A cold front will cross the waters early Tuesday.

7 Day Forecast for Marine Location Near Kings Park, VA
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location: 38.8, -77.27     debug


Area Discussion for - Baltimore, MD/Washington
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Fxus61 klwx 221857
afdlwx
area forecast discussion
national weather service baltimore md washington dc
257 pm edt Sun oct 22 2017

Synopsis High pressure will push eastward into the northwest
atlantic through Monday. Low pressure will move up the
appalachians Monday night into Tuesday. Upper troughing will
remain over the region through the second half of the week.

Near term through tonight
Mostly clear this evening, but low clouds and areas of fog are
expected to develop late tonight as low-level moisture increases
in sse flow. Warmer tonight due to more clouds and sse winds.

Short term Monday through Tuesday night
Low clouds mix out during the late morning, but mid-high clouds
thicken through the day with showers developing over the
appalachians and spreading east Mon night as moisture deepens in
response to strenghtening low-level jet. Models indicate a thin
convective line will move quickly across the area with potential
for gusty winds of 35-40 mph as strong 850mb low-level jet of
50-60 kts mixes down with the showers. The pre-frontal convective
line should be east of the chesapeake bay by 18z Tue but light
showers will remain possible tue-tue night as actual cdfnt
moves through and upper trough remains still to the west.

Rainfall amounts of 0.5 to 0.75 inches are expected except
higher over the appalachians and blue ridge mountains. Given
progressive nature of front and dry antecedent conditions, no
flooding is anticipated.

Long term Wednesday through Sunday
The cold front will be well off the eastern seaboard 12z
Wednesday as weak high pressure builds. Moderate 850 hpa cold
advection on Wednesday afternoon in NW flow should bring a fair
amount of strato-cumulus cloudiness across the area which will hold
down temperatures during the afternoon. 12z GFS shows 850 hpa
temperatures falling to at or just below 0 degc overnight Wed into
Thursday, but quickly start to rebound by 12z Thursday. Along
upslope mountain areas Wednesday night, there could be some a few
showers, with temps fall aloft to below freezing... Some wet snow
could mix with rain after midnight.

Thursday... High pressure builds across the southeast and into our
region... And will be in control with dry weather and seasonal
temperatures. Morning temperatures will probably be the coldest of
the week... But nothing unseasonably cold.

Friday... The center of the high will move off the southeast coast
during the day... Allowing a return of warmer readings to commence on
Friday under clear skies.

Weekend... Saturday... The center of high will be over new
england... And temperatures will once again rebound to above seasonal
normals. Dry weather is expected on Saturday. By Sunday, more
uncertainty in the forecast associated with the timing of a cold
front extending from a low centered over the northern great lakes,
that is expected to cross the area. The new 12z GFS is faster
brining in the colder air in on Sunday compared to the slower
00z ECMWF ensemble guidance. Looks like this is the next best chance
for widespread wetting precipitation.

Aviation 19z Sunday through Friday
Widespread low clouds (MVFR cigs) and areas of 2-4sm fog are
expected to develop late tonight as low-level moisture advects
in sse flow. Dense fog is possible at kbwi and kmtn. Showers
expected to overspread the area quickly late Mon afternoon and
early evening as cdfnt approaches. Gusty winds will accompany
these showers with gusts up to 40 mph possible. Llws is also
possible Mon night. Convective line will move east of the
terminals by 15z Tue with flying conditions improving.

ExpectVFR conditions through the extended. Possibly on Friday
there could be locally ifr visibilities in early morning fog at
iad mrb terminals.

Marine Winds are expected to strengthen some this evening but
especially Mon afternoon and night. Have issued a gale warning
for much of the chesapeake bay and lower potomac for Mon night in
anticipation of a convective line to move across the area when a
850-mb jet of 50+kt is expected to spread the area.

Small craft winds possible Wednesday. As high pressure builds in on
Thursday, expect winds waves to remain below small craft advisory
levels for the remainder of the week.

Tides coastal flooding
Water levels are expected to rise rapidly Mon night as strong
srly low-level flow develops with minor coastal flooding
expected at most of the sensitive locations.

Lwx watches warnings advisories
Dc... None.

Md... None.

Va... None.

Wv... None.

Marine... Small craft advisory from 11 am to 6 pm edt Monday for
anz531>534-537-539>541-543.

Gale warning from 6 pm Monday to 6 am edt Tuesday for
anz531>534-537-539>541-543.

Small craft advisory from 11 am Monday to 6 am edt Tuesday for
anz538-542.

Small craft advisory from 6 pm Monday to 6 am edt Tuesday for
anz530-535-536.

Synopsis... Lfr
near term... Lfr
short term... Lfr
long term... Smz
aviation... Lfr smz
marine... Lfr smz
tides coastal flooding... Lfr


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
WASD2 - 8594900 - Washington, DC 14 mi41 min SE 4.1 G 12 73°F 67°F1025.9 hPa (-0.8)
BSLM2 - Chesapeake Bay, MD 30 mi71 min SE 5.1 72°F 1026 hPa46°F
NCDV2 35 mi41 min ESE 12 G 14 70°F 69°F1025 hPa (-0.8)
APAM2 - 8575512 - Annapolis, MD 44 mi41 min 68°F 1025.7 hPa (-1.2)
44063 - Annapolis 45 mi31 min S 5.8 G 5.8 69°F 1 ft1025.3 hPa
TPLM2 - Thomas Point, MD 45 mi41 min S 8.9 G 8.9 69°F 68°F
44062 - Gooses Reef, MD 48 mi31 min SSW 9.7 G 9.7 69°F 1024 hPa
CPVM2 49 mi41 min 69°F 59°F
BLTM2 - 8574680 - Baltimore, MD 49 mi41 min S 2.9 G 6 69°F 70°F1025.6 hPa (-1.4)
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 49 mi41 min ESE 7 G 7 68°F 1026 hPa (-1.3)

Wind History for Washington, DC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Fort Belvoir, VA7 mi4.7 hrsS 710.00 miFair74°F57°F55%1027.7 hPa
Washington/Reagan National Airport, DC, VA13 mi49 minSE 1110.00 miMostly Cloudy73°F55°F53%1026 hPa
Manassas, Manassas Regional Airport/Harry P. Davis Field, VA14 mi45 minSE 910.00 miFair70°F57°F64%1026.7 hPa
Washington/Dulles International Airport, DC, VA15 mi49 minSE 810.00 miMostly Cloudy70°F54°F57%1025.4 hPa
Quantico Marine Corps Airfield - Turner Field, VA20 mi45 minSE 1110.00 miFair71°F57°F63%1026 hPa
Camp Springs / Andrews Air Force Base, MD21 mi1.7 hrsESE 810.00 miFair72°F54°F53%1026.1 hPa
College Park Airport, MD22 mi56 minESE 410.00 miFair70°F50°F50%1026.1 hPa

Wind History from DAA (wind in knots)
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Last 24hrS3CalmS3CalmCalmCalmCalmCalmCalm--CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmSE3S6SE7S7
1 day agoNW7NW7N5CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmSE4S4
2 days agoS5S4S3CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmNW4NW8NW5N6W10
G17

Tide / Current Tables for Marshall Hall, Potomac River, Maryland
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Marshall Hall
Click for Map
Sun -- 04:29 AM EDT     0.12 feet Low Tide
Sun -- 07:25 AM EDT     Sunrise
Sun -- 09:55 AM EDT     Moonrise
Sun -- 10:30 AM EDT     2.46 feet High Tide
Sun -- 04:22 PM EDT     0.17 feet Low Tide
Sun -- 06:20 PM EDT     Sunset
Sun -- 08:27 PM EDT     Moonset
Sun -- 10:39 PM EDT     2.68 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
21.40.90.50.20.20.51.11.72.22.42.421.40.80.40.20.20.51.21.92.42.62.7

Tide / Current Tables for Chain Bridge, one mile below, Washington, D.C.
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Chain Bridge
Click for Map
Sun -- 05:31 AM EDT     0.14 feet Low Tide
Sun -- 07:25 AM EDT     Sunrise
Sun -- 09:55 AM EDT     Moonrise
Sun -- 11:02 AM EDT     3.05 feet High Tide
Sun -- 05:23 PM EDT     0.20 feet Low Tide
Sun -- 06:19 PM EDT     Sunset
Sun -- 08:27 PM EDT     Moonset
Sun -- 11:11 PM EDT     3.33 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
2.92.31.610.60.20.20.71.52.32.832.82.21.50.90.50.20.30.81.62.53.13.3

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 (18,4,5,8)
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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.