Thursday, January18, 2018 L-36.com


Marine Weather and Tides
Port Tobacco Village, MD

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 7:22AMSunset 5:17PM Thursday January 18, 2018 12:43 AM EST (05:43 UTC) Moonrise 8:19AMMoonset 6:53PM 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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ANZ536 Tidal Potomac From Indian Head To Cobb Island- 1231 Am Est Thu Jan 18 2018
.small craft advisory in effect until 2 am est early this morning...
.small craft advisory in effect from 8 am est this morning through this afternoon...
Overnight..NW winds 10 kt with gusts to 20 kt. Waves 1 ft.
Thu..W winds 5 to 10 kt. Waves 1 ft.
Thu night..SW winds around 5 kt. Waves 1 ft or less.
Fri..SW winds around 5 kt. Waves 1 ft.
Fri night..SW winds 5 kt. Waves less than 1 ft.
Sat..SW winds around 5 kt. Waves 1 ft.
Sat night..NW winds around 5 kt. Waves 1 ft or less.
Sun..S winds around 5 kt. Waves 1 ft.
Mon..S winds 5 to 10 kt. Waves 1 ft. Showers likely through the night.
ANZ500 1231 Am Est Thu Jan 18 2018
Synopsis for the tidal potomac and md portion of the chesapeake bay.. Low pressure will develop and move off the north carolina coast and move out to sea overnight. High pressure will then build south of the area Thursday through Sunday.

7 Day Forecast for Marine Location Near Port Tobacco Village, MD
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location: 38.44, -77.11     debug


Area Discussion for - Baltimore, MD/Washington
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Fxus61 klwx 180226
afdlwx
area forecast discussion
national weather service baltimore md washington dc
926 pm est Wed jan 17 2018

Synopsis
A cold front will move offshore tonight as low pressure off the
carolina coast moves northeastward over the western atlantic.

High pressure will build south of the area through the weekend.

A cold front may approach the area early next week.

Near term through Thursday
Temperatures this evening have dropped quickly in to the teens
across our northern and western zones where skies are clear,
winds have slackened a bit, and a snowpack exists. After seeing
some decreasing in cloud coverage earlier this evening, clouds
have filtered back in from the south over the dc metro area
southward, likely in response to the mid to upper level trough
swinging through our area. Low pressure developing off the
carolina coast overnight will deepen and race off to the east
northeast over the atlantic as the aforementioned trough moves
east of our region. This will allow skies to clear for the
entire cwa, except along the western allegheny front, as
temperatures bottom out in the teens for most, and near 20
degrees in the city centers.

With gusty northwest winds overnight, but not as gusty as
earlier today, wind chills will dip in to the single digits to
below zero across the higher elevations and ridgetops. The
ridgetops are expected to see wind chills of -10 to -20 tonight
into Thursday morning, and a wind chill advisory is in effect
for these areas.

Winds turn more westerly as strong warming commences aloft
Thursday (850 mb temperatures rise from -5 to +5 c in about 12
hours). Despite this advection, dry W flow and subsidence
behind an upper low to the east likely keep the region mainly
sunny Thursday. Downsloping winds could push temperatures in the
lowlands well into the 40s.

Short term Thursday night through Friday night
Undercut most guidance for temperatures Thursday night with clear
skies and light winds and dew points still in the teens. Bufkit
soundings imply de-coupling at our usual ideal radiational cooling
spots. A shortwave passing to the north could result in a modest
increase in high clouds Friday, but no precipitation is expected.

The moderating trend in temperatures will continue Friday with highs
nearing 50 in many places. We will still be under the influence of
high pressure, though, so with mainly clear skies and light winds
Friday night, temperatures should again drop into the 20s.

Long term Saturday through Wednesday
High pressure will continue to settle south of the region over the
weekend. A draw of milder air from the south will allow for
temperatures to at least reach the 50s. There could be a couple of
rain showers in the western mountains as a weak front moves west to
east Saturday night into Sunday.

High pressure will move east Monday. A cold front will approach from
the west and bring a chance of rain showers, mainly in the west and
northern areas during the day. By Monday night, the rain shower
threat spreads west to east. High temperatures likely reach the 50s
once again.

Cooler air will move into the region behind the system on Tuesday,
with a decreasing chance of rain as high pressure builds back into
the region. Highs will be in the 30s and 40s.

Wednesday will be even cooler than Tuesday with high pressure
reinforcing itself across the region. Highs will be 40s near the bay
but colder in the central and western areas.

Aviation 02z Thursday through Monday
PredominateVFR conditions forecast through Friday night as high
pressure builds across the ark-la-tex region and eastward in to
the southeast u.S. Northwest winds will abate a bit overnight,
but regain their gustiness (17-20kts) Thursday morning, veering
more westerly and diminishing to around 10 knots through
Friday.

Vfr conditions Saturday through Sunday. Sub-vfr possible by Monday
as a cold front approaches from the west. Winds light and
southwesterly Saturday into Monday before increasing.

Marine
In the wake of the frontal passage earlier today, gusty
northwest winds have prevailed over our waters, resulting in sca
headlines. This gustiness will remain over the open waters
overnight, before SCA gusts return for all waters during the day
on Thursday.

Winds should become light through Friday, and even though there
may be a bit of a gradient at times between high pressure to
the south and a shortwave passing to the north, waters will be
cooler than the air and that should preclude mixing SCA gusts.

No marine hazards expected Saturday through Sunday night. Winds
southwest to west 5 to 10 knots each period.

Lwx watches warnings advisories
Dc... None.

Md... Wind chill advisory until 9 am est Thursday for mdz501.

Va... Wind chill advisory until 9 am est Thursday for vaz503-504-507-
508.

Wv... Wind chill advisory until 9 am est Thursday for wvz501-503-505-
506.

Marine... Small craft advisory until midnight est tonight for anz530-531-
535-536-538>540-542.

Small craft advisory from 8 am to 4 pm est Thursday for anz530-
531-535-536-538>540-542.

Small craft advisory until 4 pm est Thursday for anz532>534-
537-541-543.

Synopsis... Bkf dhof
near term... Bkf dhof
short term... Dhof
long term... Klw
aviation... Bkf klw dhof
marine... Bkf klw dhof


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
NCDV2 9 mi43 min N 7 G 14 22°F 32°F1024.8 hPa (-0.6)
WASD2 - 8594900 - Washington, DC 30 mi43 min NW 11 G 20 20°F 33°F1026.4 hPa (-0.7)
BSLM2 - Chesapeake Bay, MD 32 mi133 min NNW 8 21°F 1026 hPa9°F
SLIM2 - 8577330 - Solomons Island, MD 36 mi43 min NNW 13 G 18 23°F 34°F1024 hPa (-1.2)
PPTM2 - 8578240 - Piney Point, MD 37 mi43 min N 19 G 21
44062 - Gooses Reef, MD 38 mi33 min NNW 19 G 23 23°F 1023.9 hPa
COVM2 - 8577018 - Cove Point LNG Pier, MD 39 mi43 min N 23 G 27 23°F 1024.7 hPa (-1.1)
LWTV2 - 8635750 - Lewisetta, VA 46 mi43 min N 15 G 20 24°F 32°F1024.2 hPa (-1.2)
TPLM2 - Thomas Point, MD 48 mi43 min NW 14 G 15 21°F 31°F

Wind History for Washington, DC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Quantico Marine Corps Airfield - Turner Field, VA11 mi3.8 hrsN 12 G 1910.00 miPartly Cloudy25°F7°F46%1027.1 hPa
Stafford, Stafford Regional Airport, VA19 mi48 minN 510.00 miFair19°F6°F58%1027.4 hPa
Fort Belvoir, VA20 mi47 minNW 9 G 1510.00 miPartly Cloudy20°F4°F51%1026.5 hPa
Fredericksburg, Shannon Airport, VA22 mi48 minN 910.00 miFair20°F7°F58%1025.7 hPa

Wind History from NYG (wind in knots)
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Last 24hrNW4----------------N5N14
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N11N9N9N10N12
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1 day agoCalmSE5W3CalmS5CalmCalmCalmCalm3S4S3--S4S6S6S6SW3SW3CalmCalmCalmW3NW4
2 days agoN7NE6N5NW4NW5N5N5N6N5N5N7N5E8NE4NW3NE5E8E8E4NE4NE4CalmCalmNW6

Tide / Current Tables for Goose Bay, Port Tobacco River, Potomac River, Maryland
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Goose Bay
Click for Map
Thu -- 04:37 AM EST     1.31 feet High Tide
Thu -- 07:22 AM EST     Sunrise
Thu -- 08:18 AM EST     Moonrise
Thu -- 10:35 AM EST     -0.08 feet Low Tide
Thu -- 04:43 PM EST     1.45 feet High Tide
Thu -- 05:14 PM EST     Sunset
Thu -- 06:52 PM EST     Moonset
Thu -- 11:16 PM EST     -0.08 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.10.50.91.11.31.31.10.80.40.1-0-0.10.10.50.91.21.41.41.310.60.30.1-0.1

Tide / Current Tables for Maryland Point Light, Potomac River, Maryland
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Maryland Point Light
Click for Map
Thu -- 12:03 AM EST     -0.06 feet Low Tide
Thu -- 05:45 AM EST     0.98 feet High Tide
Thu -- 07:23 AM EST     Sunrise
Thu -- 08:18 AM EST     Moonrise
Thu -- 11:58 AM EST     -0.06 feet Low Tide
Thu -- 05:15 PM EST     Sunset
Thu -- 05:51 PM EST     1.08 feet High Tide
Thu -- 06:53 PM EST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-0.100.30.60.80.910.90.60.40.1-0-0.100.30.60.911.110.80.50.30.1

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 (0,6,7,8)
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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.