Monday, August20, 2018 L-36.com


Marine Weather and Tides
Brookmont, MD

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7/21/2018 Trying to make page Mobile Friendly

Sunrise 6:26AMSunset 7:57PM Monday August 20, 2018 11:00 AM EDT (15:00 UTC) Moonrise 3:04PMMoonset 12:21AM Illumination 67% Phase: Waxing Gibbous; Moon at 9 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- 1035 Am Edt Mon Aug 20 2018
Rest of today..E winds 10 kt. Waves 1 ft. A slight chance of showers late this morning, then a chance of showers this afternoon.
Tonight..E winds 5 to 10 kt. Waves 1 ft.
Tue..SE winds 5 to 10 kt. Waves 1 ft. Showers and tstms likely.
Tue night..SW winds 5 to 10 kt. Waves 1 ft. Showers and tstms likely.
Wed..W winds 5 to 10 kt. Waves 1 ft. A chance of showers.
Wed night..NW winds 5 to 10 kt. Waves 1 ft.
Thu..N winds 5 to 10 kt...becoming light. Waves 1 ft or less.
Fri..S winds around 5 kt. Waves 1 ft. Winds and waves higher and visibilities lower in and near tstms.
ANZ500 1035 Am Edt Mon Aug 20 2018
Synopsis for the tidal potomac and md portion of the chesapeake bay.. High pressure will build to the north today while a front remains stalled to the south. A warm front will lift northward through the waters on Tuesday. A cold front will sweep to the east on Wednesday followed by modified canadian high pressure taking hold through week's end. A small craft advisory may be needed Tuesday night and Wednesday.


7 Day Forecast for Marine Location Near Brookmont, MD
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location: 38.92, -77.1     debug


Area Discussion for - Baltimore, MD/Washington
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Fxus61 klwx 201410
afdlwx
area forecast discussion
national weather service baltimore md washington dc
1010 am edt Mon aug 20 2018

Synopsis
High pressure will build to the northeast today while a front
remains stalled to the south. Low pressure will pass northwest
of the area Tuesday, lifting a warm front northward. A cold
front will sweep eastward on Wednesday, with high pressure
building from the west for the end of the week.

Near term through tonight
A frontal boundary will remain south of the region today while
high pressure is positioned over new england. Low clouds will
be the rule through the morning, though the may begin to
break lift a bit during the afternoon. Showers and perhaps some
embedded thunderstorms will be most probable in central
virginia where instability will be greater, although easterly
upslope winds may cause some showers over the mountains as well.

The clouds will hold temperatures in the mid 70s to lower 80s.

Strengthening low pressure will be lifting into the great lakes
tonight, which will cause the front to slowly start lifting
north (though unlikely to clear our area due to the lingering
high pressure wedge). The best moisture and lift will be over
the mountains, but can't rule out a shower anywhere. There could
be an embedded rumble of thunder, but instability will be
minimal. Lows will be in the 60s to lower 70s.

Short term Tuesday through Wednesday night
Tuesday and Tuesday night still looks like an active period
across the region. The warm front will likely lift to the north
during the day, but plentiful moisture and instability will
likely lead to showers and some storms as it does so. This
activity, combined with cloud cover, continues to raise
questions about available instability. However, as the upper
trough approaches later in the day, deep shear will increase to
30-40 knots, which will likely act to organize some
thunderstorms along a prefrontal trough late in the day and
evening. The higher chances of severe weather may increase with
westward extent, where shear will be higher and storms are more
likely during the diurnally favorable time of day. Damaging
winds will be the primary threat, though it is worth noting
there is a good amount of turning of winds in the lower
atmosphere which could lead to rotating updrafts. Precipitable
water amounts over 2 inches could lead to heavy rainfall, though
individual elements will likely be moving with sufficient speed.

If sensitive areas get multiple rounds of rain though, some
isolated flooding could occur. Highs will be in the upper 70s to
lower 80s.

The trough, and eventually front, will sweep eastward Tuesday
night, and be near the bay Wednesday morning, with decreasing
precipitation chances through the night. A secondary front will
cross later Wednesday, with some showers and perhaps a few
storms developing along it. This front will quickly exit
Wednesday evening with dry weather ensuing and cooler, less
humid conditions (after temperatures spike up into the mid-upper
80s on Wednesday).

Long term Thursday through Sunday
High pressure will build into the region Thursday and Friday.

Northwest winds will gradually diminish and become northeasterly by
Friday afternoon. Plenty of sunshine expected through the period
with daytime high temperatures reaching near 80 Thursday, then lower
to middle 80s Friday.

Although we anticipate conditions to be dry for the most part on
Saturday, a weak shortwave approaching from the northwest could be
the deciding factor if any showers or thunderstorms develop across
the northern potomac highlands or along the mason-dixon region by
Saturday night. Highs Saturday in the middle 80s.

The shower and thunderstorm chance lingers Sunday into Monday as a
pre-frontal trough of low pressure develops on the leeside of the
potomac highlands and along the shenandoah valley. With increasing
warmth and humidity each day, any passing mid-level shortwave of
energy crossing over our CWA could spark a few showers or
thunderstorms. Highs Sunday into Monday in the middle to upper 80s
with higher humidity.

Aviation 14z Monday through Friday
MVFR clouds continue across the area this morning, with ifr
lingering for a couple more hours at cho. Gradual improvement to
vfr is likely at most sites by the mid to late afternoon and
evening hours.

Ceilings will again be an issue tonight with widespread MVFR
returning. A period of ifr will also be possible again late
tonight into early Tuesday. Cho stands the best chance of seeing
additional showers which could reduce visibility, but timing
them is problematic.

A warm front will lift northward Tuesday, followed by a cold
front Tuesday night. In between, ceilings will likely lift, but
showers and thunderstorms will become likely, some of which
could be strong with gusty winds. A secondary front will cross
on Wednesday and may produce some showers as it crosses.

Vfr conditions expected Thursday through Friday night. Northwest
winds 5 to 10 knots Thursday will become light and variable Thursday
night. Winds will become southeast around 5 knots Friday and
Friday night.

Marine
Building high pressure over new england is responsible for a
tightening gradient over the waters, with northeast to east
winds averaging 10-15 knots. This same direction is likely to
continue through tonight, with speeds perhaps decreasing a
touch. There is a low chance of an isolated thunderstorm near
southern maryland through the day.

A warm front will lift north Tuesday and flow will turn
southerly. Wind speeds through the day may be marginal for sca,
with the best chance occurring as a cold front approaches late.

Showers and thunderstorms will also become increasingly likely
during the afternoon and evening and could contain gusty winds.

A cold front will cross the area early Wednesday, and winds
don't look particularly strong behind it. However, a secondary
cold front will pass late in the day with potential for a few
showers and storms. In its wake, SCA conditions will be
possible.

No marine hazards Thursday through Friday night. Winds northwest
around 10 knots Thursday becoming light and variable Thursday night
and Friday. Winds veering to southeast 5 to 10 knots Friday
night.

Tides coastal flooding
Onshore flow will continue through early Tuesday, then turn
southerly as a warm front lifts north. The favored (higher
astronomical) tides Monday night and Tuesday night could
approach minor flood stage as anomalies increase. Best odds
appear to be Tuesday night as the southerly flow increases ahead
of an approaching cold front.

Lwx watches warnings advisories
Dc... None.

Md... None.

Va... None.

Wv... None.

Marine... None.

Synopsis... Ads
near term... Ads mm
short term... Ads
long term... Klw
aviation... Ads mm klw
marine... Ads mm klw
tides coastal flooding... Ads


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
WASD2 - 8594900 - Washington, DC 5 mi30 min E 2.9 G 8 74°F 81°F1019.6 hPa
BSLM2 - Chesapeake Bay, MD 23 mi90 min Calm 68°F 1020 hPa65°F
APAM2 - 8575512 - Annapolis, MD 33 mi30 min 73°F 1019.3 hPa
TPLM2 - Thomas Point, MD 35 mi60 min ENE 8.9 G 12 72°F 81°F1020.5 hPa (+1.8)68°F
44063 - Annapolis 35 mi30 min E 9.7 G 12 73°F 1020 hPa
FSNM2 37 mi30 min ENE 9.9 G 12 71°F 1019.8 hPa
BLTM2 - 8574680 - Baltimore, MD 37 mi30 min ESE 6 G 13 71°F 83°F1019.8 hPa
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 37 mi30 min ENE 8 G 9.9 71°F 1019.8 hPa
CPVM2 38 mi30 min 73°F 69°F
NCDV2 42 mi30 min ENE 4.1 G 8 78°F 81°F1017.8 hPa
44062 - Gooses Reef, MD 44 mi30 min ENE 12 G 14 75°F 1020.5 hPa

Wind History for Washington, DC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Washington/Reagan National Airport, DC, VA6 mi68 minNE 710.00 miOvercast74°F66°F76%1019.6 hPa
College Park Airport, MD10 mi86 minE 410.00 miOvercast70°F64°F84%1019.6 hPa
Fort Belvoir, VA14 mi64 minNNE 310.00 miOvercast72°F68°F89%1019.6 hPa
Camp Springs / Andrews Air Force Base, MD14 mi64 minNE 710.00 miOvercast71°F66°F85%1019.8 hPa
Gaithersburg - Montgomery County Airport, MD17 mi64 minVar 310.00 miOvercast71°F66°F84%1023 hPa
Washington/Dulles International Airport, DC, VA19 mi68 minE 610.00 miOvercast71°F66°F87%1019.4 hPa
Fort Meade / Tipton, MD21 mi87 minNE 610.00 miOvercast70°F64°F83%1020.7 hPa

Wind History from DCA (wind in knots)
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Last 24hrN7NW7N8N6N8NE7NE7NE8NE9NE15NE12NE10NE8NE8NE7NE8E9NE10NE8NE11NE11NE8NE7NE5
1 day agoSW8W9W9W10W11W10W8SW8W7NW4W8W5W5NW5NW7N6NW7NW9N9N7NW9N7N8N6
2 days agoS9S10S12S12S12S10
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CalmSW4SW4W3SW4S3S5SW8

Tide / Current Tables for Chain Bridge, one mile below, Washington, D.C.
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Chain Bridge
Click for Map
Mon -- 01:21 AM EDT     Moonset
Mon -- 04:37 AM EDT     3.23 feet High Tide
Mon -- 06:26 AM EDT     Sunrise
Mon -- 11:31 AM EDT     0.47 feet Low Tide
Mon -- 04:04 PM EDT     Moonrise
Mon -- 05:12 PM EDT     2.83 feet High Tide
Mon -- 07:56 PM EDT     Sunset
Mon -- 11:26 PM EDT     0.49 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.91.62.32.93.23.22.92.41.81.30.90.50.50.91.62.12.62.82.72.21.71.10.80.5

Tide / Current Tables for Reagan National Airport, Washington, D.C.
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Reagan National Airport
Click for Map
Mon -- 01:21 AM EDT     Moonset
Mon -- 04:19 AM EDT     3.39 feet High Tide
Mon -- 06:26 AM EDT     Sunrise
Mon -- 11:15 AM EDT     0.51 feet Low Tide
Mon -- 04:03 PM EDT     Moonrise
Mon -- 04:55 PM EDT     2.96 feet High Tide
Mon -- 07:55 PM EDT     Sunset
Mon -- 11:08 PM EDT     0.53 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.11.92.63.13.43.32.92.31.81.30.80.50.61.21.82.42.832.72.21.610.70.5

Weather Map and Satellite Images
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wmap_A
GOES Local Image of    EDIT
NOTE: East coast views moved to GEOS-16. They are experimental and not well supported by NOAA so they may not be correct so be warned. This change required redoing a large amount of the GOES code. If the image you are expecting is not showing, please let me know. You may need to use the EDIT function to update your location.
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Wind Forecast for Baltimore, MD/Washington (11,2,3,4)
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Ground Weather Radar Station Sterling, VA
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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.