Saturday, August17, 2019 L-36.com


Marine Weather and Tides
Frederick, 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 6:22AMSunset 8:04PM Saturday August 17, 2019 9:12 PM EDT (01:12 UTC) Moonrise 8:30PMMoonset 7:10AM Illumination 94% Phase: Waning Gibbous; Moon at 17 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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ANZ538 Patapsco River Including Baltimore Harbor- 736 Pm Edt Sat Aug 17 2019
Tonight..S winds 5 kt. Waves flat. Isolated showers and tstms this evening.
Sun..S winds 5 to 10 kt. Waves 1 ft or less. Scattered showers and tstms.
Sun night..S winds 5 to 10 kt. Waves 1 ft.
Mon..S winds 5 kt. Waves flat.
Mon night..SW winds 5 kt. Waves flat.
Tue..SW winds 5 kt. Waves less than 1 ft. A chance of showers and tstms.
Tue night..S winds 5 kt. Waves less than 1 ft. A chance of showers and tstms.
Wed..SW winds 5 kt. Waves less than 1 ft. A chance of tstms. A chance of showers.
Thu..NW winds 5 kt. Waves less than 1 ft. Showers likely with a chance of tstms, then a chance of showers after midnight. Winds and waves higher and visibilities lower in and near tstms.
ANZ500 736 Pm Edt Sat Aug 17 2019
Synopsis for the tidal potomac and md portion of the chesapeake bay.. High pressure over the atlantic will control the weather pattern through Monday. A trough will build near the waters for Tuesday and Wednesday. Small craft advisories may be needed for portions of the waters Wednesday.


7 Day Forecast for Marine Location Near Frederick, MD
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location: 39.43, -77.41     debug


Area Discussion for - Baltimore, MD/Washington
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Fxus61 klwx 171846
afdlwx
area forecast discussion
national weather service baltimore md washington dc
246 pm edt Sat aug 17 2019

Synopsis An upper-level ridge will build overhead
through Monday with surface high pressure in the atlantic. Hot
and humid conditions will persist during this time. The upper-
level ridge will gradually weaken Tuesday and Wednesday before a
cold front passes through Thursday. High pressure will return
for late next week bringing noticeably cooler and less humid
conditions.

Near term through tonight
Isolated to scattered thunderstorms will dissipate early this
evening with clear skies. Low clouds and or fog may form again
late tonight in northeast md and the va piedmont, but model
guidance indicate that it should be less widespread than past
two mornings. Otherwise, warm and muggy with lows in the 70s.

Short term Sunday through Monday night
A bit more convective coverage is shown by hi-res models
for Sunday afternoon, otherwise hotter and more humid with
temperatures reaching into the middle 90s with heat indices
exceeding 100f in many places and may reach 105f briefly in a
few spots but should be for an hour or less, so not anticipating
issuing any heat advisories at this time.

Mid-upper level ridge peaks over the area Monday with similar
temperatures to Sunday perhaps a few degrees hotter over western
md and western va. Models showing a marked decrease in
convective coverage due to high heights aloft and strengthening
subsidence inversion.

Long term Tuesday through Saturday
An upper level trough of low pressure will push across the great
lakes later on Tuesday into Wednesday. The heat and humidity will
remain in place ahead of the trough. These conditions will fuel the
chance for showers and thunderstorms. Some thunderstorms will be on
the strong side because of the increased instability.

Additional showers and thunderstorms could develop Wednesday
night into Thursday as the upper trough pushes across the mid-
atlantic region and toward the east coast. A surface cold front
will be nudged by the upper trough Thursday and Thursday night.

Slightly cooler conditions expected each day from Wednesday
through Friday, either due to cloud cover and convection or a
change in the air mass due to cold frontal passage. By the end
of the week, high temperatures may only reach the lower to
middle 80s.

High pressure will build in late week and this weekend.

Less humid conditions expected with the building high.

Aviation 18z Saturday through Thursday
Patchy light fog in the morning (3-5sm vsbys) with only a
slight risk of a t-storm in the afternoon. Otherwise, hot and
humid next few days. Risk of thunderstorms increases Tue and
wed.

Brief MVFR conditions possible at the terminals Tuesday afternoon
and then again during the day Wednesday with a development of
showers and thunderstorms. Some thunderstorms may be strong enough
to reduce visibility to ifr at some terminals. Winds southwest
around 5 knots Tuesday through Wednesday night. Gusts higher in
heavy thunderstorms.

Marine
Light winds generally 10 kt or less. Slight risk of a
thunderstorm each afternoon and night. Locally higher winds and
waves in thunderstorms.

No marine hazards expected Tuesday through Wednesday night. If any
strong thunderstorm affects the potomac and or chesapeake bay
through the period, a special marine warning may be warranted. Winds
generally southwest 5 to 10 knots.

Lwx watches warnings advisories
Dc... None.

Md... None.

Va... None.

Wv... None.

Marine... None.

Synopsis... Lfr
near term... Lfr
short term... Lfr
long term... Klw
aviation... Lfr klw
marine... Lfr klw


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
WASD2 - 8594900 - Washington, DC 44 mi73 min SW 2.9 G 7 87°F 84°F1014.5 hPa (+0.6)
BLTM2 - 8574680 - Baltimore, MD 45 mi73 min S 2.9 G 4.1 84°F 83°F1014 hPa (+0.3)
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 49 mi73 min S 2.9 G 2.9 83°F 1014.4 hPa (+0.5)
FSNM2 49 mi79 min Calm G 4.1 83°F 1014.5 hPa

Wind History for Washington, DC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Frederick Municipal Airport, MD2 mi86 minN 010.00 miClear84°F71°F66%1015.6 hPa
Gaithersburg - Montgomery County Airport, MD22 mi77 minSE 610.00 miA Few Clouds82°F71°F69%1016.6 hPa

Link to 5 minute data for KFDK

Wind History from FDK (wind in knots)
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Last 24hrCalmCalmCalmCalmCalmCalmCalmE3CalmCalmCalmCalmCalm--SW4--S5SW4S3SW3S3S3CalmS6
1 day agoCalmCalmNE3CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmS4S4Calm--S3SE3SE5--S2Calm--
2 days agoCalmCalmNE3CalmCalmNE3N3CalmCalmCalmCalmCalmCalmCalmSE7SE53CalmE7S5SE6SE5CalmN4

Tide / Current Tables for Chain Bridge, D.C.
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Chain Bridge
Click for Map
Sat -- 04:56 AM EDT     0.44 feet Low Tide
Sat -- 06:23 AM EDT     Sunrise
Sat -- 08:09 AM EDT     Moonset
Sat -- 10:40 AM EDT     3.25 feet High Tide
Sat -- 05:24 PM EDT     0.36 feet Low Tide
Sat -- 08:00 PM EDT     Sunset
Sat -- 09:27 PM EDT     Moonrise
Sat -- 11:05 PM EDT     3.10 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.621.40.90.60.40.71.32.22.83.23.22.92.31.71.10.70.40.40.91.72.52.93.1

Tide / Current Tables for Chain Bridge, one mile below, D.C.
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Chain Bridge
Click for Map
Sat -- 04:51 AM EDT     0.44 feet Low Tide
Sat -- 06:23 AM EDT     Sunrise
Sat -- 08:09 AM EDT     Moonset
Sat -- 10:35 AM EDT     3.25 feet High Tide
Sat -- 05:19 PM EDT     0.36 feet Low Tide
Sat -- 08:00 PM EDT     Sunset
Sat -- 09:27 PM EDT     Moonrise
Sat -- 11:00 PM EDT     3.10 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.621.40.90.60.40.71.42.22.93.23.22.82.21.610.60.40.411.82.52.93.1

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.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Baltimore, MD/Washington (21,6,7,8)
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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.