Monday, November20, 2017 L-36.com


Marine Weather and Tides
Forest Heights, 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 6:55AMSunset 4:52PM Monday November 20, 2017 12:17 PM EST (17:17 UTC) Moonrise 8:37AMMoonset 6:45PM Illumination 4% Phase: Waxing Crescent; Moon at 2 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- 947 Am Est Mon Nov 20 2017
.small craft advisory in effect from Tuesday morning through Tuesday afternoon...
Rest of today..W winds 10 kt. Waves 1 ft.
Tonight..S winds 5 to 10 kt. Waves 1 ft.
Tue..S winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft.
Tue night..SW winds 5 to 10 kt. Waves 1 ft. A chance of showers.
Wed..NW winds 10 to 15 kt. Waves 1 ft.
Wed night..N winds 5 to 10 kt. Waves 1 ft.
Thu..W winds around 5 kt. Waves 1 ft.
Fri..S winds around 5 kt. Waves 1 ft.
ANZ500 947 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 tonight. 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 night through Wednesday night.

7 Day Forecast for Marine Location Near Forest Heights, MD
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location: 38.83, -77.03     debug


Area Discussion for - Baltimore, MD/Washington
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Fxus61 klwx 201536
afdlwx
area forecast discussion
national weather service baltimore md washington dc
1036 am est Mon nov 20 2017

Synopsis
High pressure will build to our south through tonight. 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. The high will
build to our south for Friday and Saturday before a cold front
moves through Saturday night.

Near term through tonight
Upper-level trough moving east of us this morning while surface
high pressure builds to the south. Rising heights will allow
plenty of sunshine this afternoon... But temps will still be
below average for this time of year. MAX temps will range from
the upper 30s along the ridges of the allegheny highlands... To
the mid and upper 40s in northern maryland... To the middle 50s
in central virginia.

The high will remain to the south tonight. A weak shortwave in
a southwest flow aloft may bring a few high clouds... But dry
conditions will persist. Min temps will range from the mid and
upper 20s in the colder valleys to the mid and upper 30s in
downtown washington and baltimore.

Short term Tuesday through Wednesday night
High pressure will shift offshore Tuesday while a cold front
moves through the great lakes. A southwest flow in between these
systems will allow for milder conditions. MAX temps will be in
the upper 50s to lower 60s across most locations. There will be
some high clouds in a southwest flow aloft... But the cloud deck
should be thin enough for a partly to mostly sunny sky much of
the day.

The cold front will approach our area from the north and west
Tuesday evening before passing through overnight Tuesday into
early Wednesday morning. There will be separation between the
lift associated with the cold front and deeper moisture to our
south and east. Latest guidance shows that some of this moisture
can get drawn up into the front... Bringing the chance for
showers. The best chance for showers will be across eastern
areas where moisture has a better chance to move in before the
frontal passage.

Any showers early Wednesday morning should dissipate as the cold
front moves off to the south and east. A northwest flow will
cause chillier conditions despite increasing sunshine. High
pressure will settle overhead and it will turn out dry and cold.

Did also want to note that a few snow showers are possible along
and west of the allegheny front Tuesday night into early
Wednesday. However... As discussed earlier moisture should be
limited so any accumulation would be light.

Long term Thursday through Sunday
Longwave western us ridging and east coast troughing will
continue to dominate the weather pattern over the united states
through the holiday weekend. While no significant storm systems
are currently forecast, several upper level impulses will move
through the large-scale troughing.

Sprawling surface high pressure is expected to be in place on
thanksgiving day from the southern plains extending
northeastward through the appalachians. At the same time, weak
shortwave energy in both the northern and southern branches of
the jet stream will be moving towards the east coast and may
lead to surface cyclogensis off the southeastern us coastline.

At this time, the surface ridging and flow aloft is expected to
keep anything that can develop well to our south and east,
leading to a dry and uneventful weather forecast for
thanksgiving day. Surface ridging is expected to persist into
Friday as well, keeping the forecast dry.

By Friday night and Saturday, a more potent northern stream
system will move into the upper midwest, with its associated
cold front barrelling towards the mid-atlantic Saturday night.

Once again, southern stream energy will be present as well near
the southeastern states, and the potential exists for surface
cyclogenesis to occur. At this time, fast flow aloft and
orientation of upper level trough suggests that a track well
offshore is favored. However, chances for rain showers increase,
either with the offshore low or with the cold front itself.

Following the front Sunday, blustery and colder conditions are
likely, along with the potential for snow showers over the
higher terrain.

Temperatures will start out below normal on thanksgiving (40s),
moderate back towards normal or even a bit above for Friday and
Saturday (50s), before falling back below for Sunday (40s).

Aviation 15z Monday through Friday
Vfr conditions will persist through Tuesday. Winds are mostly
below 15 knots at present and will gradually turn to the
southwest this afternoon and continue like so tonight.

On Tuesday, southwest winds will continue, with gusts around 20
knots in the afternoon. A cold front will pass through Tuesday
night into early Wednesday. A few showers are possible along
with subvfr cigs. The best chance for this will be across the
eastern terminals.VFR conditions will return behind the cold
front for later Wednesday through Wednesday night.

Vfr and light winds expected Thursday and Friday with surface
high pressure

Marine
West winds this morning will gradually turn to the southwest
this afternoon. Wind gusts should gradually diminish throughout
the day. SCA continues across portions of the bay thru the day,
but winds may drop below SCA criteria on all waters late in the
afternoon. However, southerly channeling will develop this
evening as high pressure shifts east, with SCA returning, so
the period of sub SCA will likely be less than 6 hours where the
sca remains in effect through the period.

High pressure will move offshore Tuesday. South to southwest
winds will increase during this time ahead of the next cold
front. Therefore, SCA for all the waters Tuesday. The SCA was
extended into Tuesday evening for portions of the waters.

A cold front will pass through the waters late Tuesday night
into Wednesday morning. Northwest winds will pick up behind the
front and an SCA may be needed for portions of the waters later
Wednesday into Wednesday night.

Sub-sca conditions expected Thursday and Friday with surface
high pressure.

Lwx watches warnings advisories
Dc... None.

Md... None.

Va... None.

Wv... None.

Marine... Small craft advisory until 6 pm est this evening for anz530-
531-539.

Small craft advisory from midnight tonight to midnight est
Tuesday night for anz531-539-542.

Small craft advisory from 6 am to 6 pm est Tuesday for anz535-
536-538.

Small craft advisory until midnight est Tuesday night for
anz532>534-540-541-543.

Small craft advisory from 6 am Tuesday to midnight est Tuesday
night for anz530.

Small craft advisory until noon est today for anz537.

Small craft advisory from 6 pm this evening to midnight est
Tuesday night for anz537.

Synopsis... Bjl rcm
near term... Bjl rcm
short term... Bjl rcm
long term... Mm
aviation... Bjl mm rcm
marine... Bjl mm rcm


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
WASD2 - 8594900 - Washington, DC 3 mi48 min WSW 4.1 G 9.9 45°F 48°F1022.9 hPa
BSLM2 - Chesapeake Bay, MD 17 mi48 min WNW 6 45°F 1023 hPa20°F
APAM2 - 8575512 - Annapolis, MD 31 mi48 min 44°F 1021.6 hPa
44063 - Annapolis 32 mi38 min NW 12 G 16 44°F 1022.2 hPa
TPLM2 - Thomas Point, MD 32 mi78 min WNW 17 G 20 42°F 52°F
NCDV2 35 mi48 min WSW 8 G 11 47°F 51°F1022.4 hPa
CPVM2 36 mi48 min 45°F 24°F
44062 - Gooses Reef, MD 38 mi38 min NW 12 G 16 46°F 1026.6 hPa
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 38 mi48 min W 13 G 15 43°F 1021.7 hPa
BLTM2 - 8574680 - Baltimore, MD 39 mi48 min NW 7 G 12 44°F 54°F1021.5 hPa
44043 - Patapsco, MD 41 mi38 min WNW 12 G 18 43°F 1022.8 hPa
COVM2 - 8577018 - Cove Point LNG Pier, MD 45 mi48 min WNW 11 G 16 45°F 1023.4 hPa
SLIM2 - 8577330 - Solomons Island, MD 47 mi48 min W 8.9 G 13 47°F 54°F1022.5 hPa
TCBM2 - 8573364 - Tolchester Beach, MD 49 mi48 min W 12 G 16 43°F 49°F1022.1 hPa

Wind History for Washington, DC
(wind in knots)    EDIT      (on/off)   Help
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Last
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NW16
G27
W12
G25
NW12
G22
NW12
G27
NW7
G20
NW9
G18
NW6
G9
W8
G13
NW8
G11
NW11
G18
NW7
G17
NW10
G13
NW6
G9
NW7
G16
NW6
G9
NW8
G12
W8
G14
NW8
G15
NW6
G11
W5
G8
NW11
W6
G10
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G13
W8
G15
1 day
ago
S11
S14
G20
S12
G17
S9
G16
S7
G10
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S6
G9
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G15
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S14
G17
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G19
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G20
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G16
SW7
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G17
NW10
G25
NW16
G24
NW7
G17
NW11
G21
NW14
G28
NW10
G26
NW16
G22
2 days
ago
N6
G10
NW4
G15
W7
G10
NW4
G8
NW5
G8
NW3
--
E1
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S1
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S1
SE2
S4
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G8
S5
G8
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S8
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G11
S12
G16
S11
S11
G15

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Washington/Reagan National Airport, DC, VA2 mi26 minWSW 1110.00 miA Few Clouds48°F21°F36%1022.9 hPa
Camp Springs / Andrews Air Force Base, MD8 mi22 minWSW 1110.00 miFair46°F20°F35%1022.8 hPa
Fort Belvoir, VA11 mi22 minW 10 G 1510.00 miFair48°F20°F33%1023 hPa
College Park Airport, MD12 mi32 minW 9 G 1510.00 miFair45°F18°F35%1022.3 hPa
Fort Meade / Tipton, MD23 mi33 minSW 10 G 1510.00 miFair45°F21°F39%1023 hPa
Washington/Dulles International Airport, DC, VA24 mi26 minW 910.00 miA Few Clouds46°F21°F38%1022.5 hPa
Gaithersburg - Montgomery County Airport, MD24 mi22 minW 10 G 1510.00 miFair44°F21°F41%1025.1 hPa

Wind History from DCA (wind in knots)
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Last 24hrW14
G26
NW14
G26
W21
G29
W13
G20
W15
G24
W8NW10W10W13
G23
W12
G19
W13
G20
NW5NW9NW5W9
G20
NW12
G17
NW11NW8W8NW8W11W9
G16
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SW11
1 day agoS17
G24
S16
G23
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G26
S9S9S10S13S11S13
G20
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G27
S16
G24
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G21
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G24
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W11NW25
G42
W15
G25
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G32
W18
G26
NW17
G29
NW17
G28
NW18
G26
2 days agoNW9W9NW8NW9W6NW3CalmCalmS3SW3SW5S4S4S6S4S6S8S10S11S12S15
G24
S12S17
G23
S11
G18

Tide / Current Tables for Bellevue, Potomac River, Washington, D.C.
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Bellevue
Click for Map
Mon -- 03:51 AM EST     -0.02 feet Low Tide
Mon -- 06:56 AM EST     Sunrise
Mon -- 08:36 AM EST     Moonrise
Mon -- 09:24 AM EST     2.76 feet High Tide
Mon -- 03:39 PM EST     0.05 feet Low Tide
Mon -- 04:50 PM EST     Sunset
Mon -- 06:45 PM EST     Moonset
Mon -- 09:30 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
1.610.50.1-00.311.82.42.72.72.21.50.90.40.10.10.41.22.12.7332.6

Tide / Current Tables for Benning Bridge, D.C.
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Benning Bridge
Click for Map
Mon -- 04:07 AM EST     0.02 feet Low Tide
Mon -- 06:56 AM EST     Sunrise
Mon -- 08:36 AM EST     Moonrise
Mon -- 09:40 AM EST     2.83 feet High Tide
Mon -- 03:55 PM EST     0.10 feet Low Tide
Mon -- 04:50 PM EST     Sunset
Mon -- 06:44 PM EST     Moonset
Mon -- 09:46 PM EST     3.17 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.91.20.70.300.20.91.72.42.72.82.41.81.10.60.20.10.311.92.73.13.22.9

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 (12,3,4,5)
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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.