Saturday, August17, 2019 L-36.com


Marine Weather and Tides
Halfway, 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 6:23AMSunset 8:06PM Saturday August 17, 2019 10:31 PM EDT (02:31 UTC) Moonrise 8:31PMMoonset 7:11AM 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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ANZ535 Tidal Potomac From Key Bridge To Indian Head- 913 Pm Edt Sat Aug 17 2019
Rest of tonight..S winds 5 kt. Waves less than 1 ft.
Sun..S winds 5 kt. Waves less than 1 ft. Scattered showers and tstms.
Sun night..S winds around 5 kt. Waves 1 ft.
Mon..SW winds around 5 kt. Waves 1 ft.
Mon night..W winds around 5 kt. Waves 1 ft.
Tue..S winds around 5 kt. Waves 1 ft. A chance of showers and tstms.
Tue night..SW winds around 5 kt. Waves 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 913 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 Halfway, MD
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location: 39.62, -77.79     debug


Area Discussion for - Baltimore, MD/Washington
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Fxus61 klwx 180127
afdlwx
area forecast discussion
national weather service baltimore md washington dc
927 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 until 6 am Sunday morning
Other than a couple of small isolated showers, convection has
dissipated. Storms in central pa are also weakening and seem
unlikely to make it to our cwa. Believe the remainder of the
night will be dry, but with elevated instability remaining in
place, it would only take a small trigger for an isolated shower
or even thunderstorm to develop.

Low clouds and or fog may form again late tonight in northeast
md and the va piedmont, but model guidance indicates that it
should be less widespread than past two mornings. Otherwise,
warm and muggy with lows in the mid 60s to mid 70s.

Short term 6 am Sunday morning through Monday night
A bit more convective coverage is shown by hi-res models
for Sunday afternoon, but still only scattered in nature.

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 01z Sunday through Thursday
Patchy light fog (3-5sm vsbys, but there could be some ifr,
especially at cho and mrb) is expected during the early morning
hours of Sunday and Monday. Isolated to widely scattered showers
and thunderstorms are possible each afternoon, but will be
difficult to pinpoint times and locations due to lack of an
organized threat. Otherwise, hot and humid for the next few
days.

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 south to southwest winds generally 10 kt or less through
Monday. Slight risk of a thunderstorm each afternoon and
evening. 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... Ads lfr
short term... Lfr
long term... Klw
aviation... Ads lfr klw
marine... Ads lfr klw


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
WASD2 - 8594900 - Washington, DC 66 mi50 min Calm 82°F 84°F1015 hPa
BLTM2 - 8574680 - Baltimore, MD 69 mi50 min WSW 1.9 G 1.9 83°F 83°F1014.5 hPa
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 72 mi44 min S 1.9 G 1.9 82°F 1015 hPa

Wind History for Washington, DC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Hagerstown, Washington County Regional Airport, MD7 mi39 minN 010.00 miFair81°F68°F65%1015.7 hPa
Eastern WV Regional Airport/Shepherd Field, WV18 mi39 minN 010.00 miFair77°F70°F79%1014.4 hPa

Link to 5 minute data for KHGR

Wind History from HGR (wind in knots)
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Last 24hrSE3CalmCalmSE4CalmNW3CalmNW4CalmW3Calm4Calm5SW8S63S6S7SW8S8S3E3Calm
1 day agoE4E3NW4W6W3SE6CalmCalmCalmCalmNW5SW4S9S6SW5SE10SE4S8S8S8SE9SE3SE5SE4
2 days agoNE3CalmN4N5N5N3NW4CalmN4CalmCalmCalmNW5S5CalmSE6S12S12SE9S8SE6SE5SE4Calm

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 (22,6,7,8)
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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.