Saturday, August24, 2019 L-36.com


Marine Weather and Tides
Brookmont, MD

Version 3.4
NOTICE
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.
6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

Sunrise 6:28AMSunset 7:52PM Saturday August 24, 2019 8:25 AM EDT (12:25 UTC) Moonrise 12:00AMMoonset 2:03PM Illumination 35% Phase: Waning Crescent; Moon at 24 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- 736 Am Edt Sat Aug 24 2019
Today..NE winds 5 to 10 kt. Waves 1 ft.
Tonight..NE winds 5 to 10 kt. Waves 1 ft.
Sun..E winds 5 to 10 kt. Waves 1 ft.
Sun night..NE winds 5 to 10 kt. Waves 1 ft.
Mon..NE winds 5 to 10 kt. Waves 1 ft.
Mon night..NE winds around 5 kt. Waves 1 ft.
Tue..SE winds around 5 kt. Waves 1 ft. A chance of showers.
Wed..NW winds around 5 kt. Waves 1 ft. A chance of tstms. A chance of showers. Winds and waves higher and visibilities lower in and near tstms.
ANZ500 736 Am Edt Sat Aug 24 2019
Synopsis for the tidal potomac and md portion of the chesapeake bay.. High pressure will settle north of the waters this weekend. Low pressure off the florida coast will likely move northward offshore of the eastern seaboard early next week. Small craft advisories may be needed Sunday into Monday.


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 240757
afdlwx
area forecast discussion
national weather service baltimore md washington dc
357 am edt Sat aug 24 2019

Synopsis
A cold front will move into the southern mid-atlantic today.

Strong high pressure will build north of the region through
early next week. A tropical cyclone could form over the weekend
and move near the southeast coast and out to sea.

Near term through tonight
Isolated light rain showers are moving west to east across nelson
and parts of albemarle counties in virginia. Rain amounts will be
only a few hundredths of an inch at best. Aside from the showers,
patches of dense fog have formed in valleys in the potomac highlands
and shenandoah valley. These are areas where wind has grown calm and
dewpoint temperatures are near 60. Visibility has fluctuated in most
of these areas from around 2 miles to one-quarter mile then back up
to 1 mile. Low confidence in a prolonged period of dense fog but
will closely monitor the situation over the next hour or so to
decide if an advisory will be needed or not.

As for today, high pressure will continue to build to our north and
usher in drier and cooler air than during the early to middle of
last week. Obviously, the cloud cover and light to moderate rain
showers with the passing front on Friday had kept our temperatures
in the 60s throughout the day for the most part. However, we are
anticipating a little more sunshine today that will inevitably lift
our temperatures from the lower 60s to the lower to middle 70s over
most of the region. A few showers can't be ruled out near the
chesapeake bay area with a northeast to onshore flow during the
afternoon.

Dry conditions will continue tonight as temperatures drop to the
middle to upper 50s on a light northerly wind and partially clearing
skies.

Short term Sunday through Monday night
With high pressure in control to our north and soon to be to our
northeast Sunday into Sunday night, another dry and cool day in
store for us during the period. High temperatures Sunday will be
about the same as today, if not about 3 degrees warmer. The cooler
scenario would rely on whether we have a northerly component to our
wind or an easterly component to our wind Sunday into Sunday night.

Again, a stray shower or two can't be ruled out along the chesapeake
bay during the afternoon.

As for Monday into Monday night, the high pressure center makes a
move toward the northeast to allow for an easterly wind and then a
gradual southeast wind. These change in direction will allow for
warmth and moisture to return to the region Monday into Monday
night, primarily the moisture.

Temperatures will still only reach the middle to upper 70s Monday
afternoon. There is a chance that rain showers will develop not just
along the chesapeake bay, but in other places as well. Rain amounts
will be light, if they occur.

Long term Tuesday through Friday
Coastal low pressure will be sliding offshore Tuesday, increasing
the threat of showers. Onshore flow may provide a bit of a cooler
wedge, but its too soon to rule embedded thunderstorms out-- a small
deviation in the details would allow for sufficient heating. Ample
moisture will be in play, and heights will be dropping by the end of
the day.

That trough axis, with a surface cold front, will be crossing the
area Wednesday... Making this period the most likely time frame for
precipitation. Given the humidity of the air mass ahead of the
front, thunderstorms also possible, but its uncertain whether there
will be enough upper level support for strong storms.

Continental high pressure will gradually build Thursday-Friday, with
the 500 mb trough axis gradually dampening. Given the low heights,
wouldn't completely rule out a diurnally driven shower on Thursday,
but the trend will deviate toward seasonable dry conditions by the
end of the week.

Aviation 08z Saturday through Wednesday
Patchy dense fog has been causing visibility to fluctuate in the
shenandoah valley and toward the mason-dixon line. Although we are
anticipating ifr conditions near mrb, there is a chance that lifr
could occur at some point near daybreak. All in all for the
remainder of the terminals, and for mrb from mid-morning on,VFR
conditions are expected with building high pressure. Winds will be
northwest at first becoming northerly then northeasterly over the
course of today, tonight and Sunday.

Vfr conditions expected again Monday into Monday night. Any isolated
showers could bring lower ceilings to the TAF sites Monday
afternoon. Winds northeast becoming southeast Monday into Monday
night.

Onshore winds Tuesday may bring a marine layer inland. While
confidence in details low, flight restrictions due to ceilings
possible. If low ceilings do form, they would be likely to lift
Wednesday; however, as a cold front advances, the threat for showers
and thunderstorms increase. Restrictions on Wednesday likely to
be more brief spotty in nature.

Marine
A small craft advisory is in effect through noon today for all
zones, then for the tidal potomac and central chesapeake bay
this evening and overnight. Additional small craft advisories
may be imminent for the marine zones Sunday afternoon and then
again for Monday. One factor could be the pressure gradient
between the high pressure to the north and northeast and the
developing coastal sub- tropical or tropical low pressure system
over the southeast u.S.

East northeast winds Tue will become west wed. At this point, the
strongest winds appear as though they may be associated with
showers thunderstorms due to a cold front Wednesday.

Lwx watches warnings advisories
Dc... None.

Md... None.

Va... None.

Wv... None.

Marine... Small craft advisory until noon edt today for anz531>534-537-
539>541-543.

Small craft advisory from 6 pm this evening to 6 am edt Sunday
for anz534-537-543.

Synopsis... Klw
near term... Klw
short term... Klw
long term... Hts
aviation... Klw hts
marine... Klw hts


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
WASD2 - 8594900 - Washington, DC 5 mi61 min N 2.9 G 8 65°F 83°F1021.6 hPa
BSLM2 - Chesapeake Bay, MD 23 mi115 min NNW 1 60°F 1020 hPa59°F
APAM2 - 8575512 - Annapolis, MD 33 mi55 min 69°F 1020.6 hPa
TPLM2 - Thomas Point, MD 35 mi25 min N 14 G 16 69°F 80°F1022.1 hPa (+1.9)56°F
BLTM2 - 8574680 - Baltimore, MD 37 mi61 min NNE 8.9 G 11 65°F 82°F1020.9 hPa
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 37 mi55 min NNE 9.9 G 12 65°F 1021.3 hPa
FSNM2 37 mi61 min N 11 G 13 1021 hPa
CPVM2 38 mi55 min 71°F 61°F
NCDV2 42 mi61 min N 4.1 G 8 67°F 84°F1019.8 hPa
44062 - Gooses Reef, MD 44 mi31 min NE 14 G 16 71°F 1021.7 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 mi33 minN 710.00 miA Few Clouds67°F55°F68%1021.9 hPa
College Park Airport, MD10 mi42 minN 010.00 miFair61°F59°F94%1021.7 hPa
Camp Springs / Andrews Air Force Base, MD14 mi29 minN 710.00 miFair64°F57°F80%1022.2 hPa
Fort Belvoir, VA14 mi29 minN 310.00 miFair65°F57°F76%1021.9 hPa
Gaithersburg - Montgomery County Airport, MD17 mi29 minN 010.00 miFair61°F55°F84%1024 hPa
Washington/Dulles International Airport, DC, VA19 mi33 minN 710.00 miA Few Clouds64°F55°F75%1022.1 hPa
Fort Meade / Tipton, MD21 mi43 minN 07.00 miFair55°F55°F100%1022.7 hPa

Link to 5 minute data for KDCA

Wind History from DCA (wind in knots)
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Last 24hrN12N13NE11N13N11N11N11N9N10N9N12N7N6N7NW6NW5NW7N8N6N5N8N10N10N7
1 day ago4NW9W116
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SW10S7S11SW11S11S11SW14W7S5SW7SW6SW9SW5SW5CalmNW8N7N10
2 days agoSW8SW10S11S14S10SW12S9S14S14S12E9S3S4NE5S4S6S4CalmN3SW3SW3SW3SW3W4

Tide / Current Tables for Chain Bridge, one mile below, Washington, D.C.
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Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.


Tide / Current Tables for Reagan National Airport, Washington, D.C.
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Reagan National Airport
Click for Map
Sat -- 12:22 AM EDT     Moonrise
Sat -- 02:40 AM EDT     3.39 feet High Tide
Sat -- 06:29 AM EDT     Sunrise
Sat -- 09:58 AM EDT     0.76 feet Low Tide
Sat -- 03:02 PM EDT     Moonset
Sat -- 03:26 PM EDT     2.85 feet High Tide
Sat -- 07:50 PM EDT     Sunset
Sat -- 09:34 PM EDT     0.56 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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22.93.33.43.12.72.11.51.10.80.80.91.322.62.82.82.521.40.90.60.60.8

Weather Map and Satellite Images
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wmap_A
GOES Local Image of Mid-Atlantic    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 (8,2,3,4)
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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.