Tuesday, June25, 2019 L-36.com


Marine Weather and Tides
Williamsport, MD

Version 3.4
NOTICE
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 5:42AMSunset 8:44PM Tuesday June 25, 2019 10:54 PM EDT (02:54 UTC) Moonrise 12:26AMMoonset 12:26PM Illumination 39% Phase: Third Quarter Moon; Moon at 23 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- 1037 Pm Edt Tue Jun 25 2019
Rest of tonight..NW winds 5 kt. Waves less than 1 ft.
Wed..W winds 5 kt. Waves less than 1 ft.
Wed night..W winds around 5 kt. Waves 1 ft.
Thu..NW winds around 5 kt. Waves 1 ft.
Thu night..W winds around 5 kt. Waves 1 ft or less.
Fri..SW winds around 5 kt. Waves 1 ft.
Fri night..SW winds around 5 kt. Waves 1 ft.
Sat..W winds around 5 kt. Waves 1 ft.
Sun..NW winds 5 to 10 kt. Waves 1 ft. A chance of showers.
ANZ500 1037 Pm Edt Tue Jun 25 2019
Synopsis for the tidal potomac and md portion of the chesapeake bay.. High pressure will build from the tennessee valley toward the mid- atlantic this week.


7 Day Forecast for Marine Location Near Williamsport, MD
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location: 39.58, -77.81     debug


Area Discussion for - Baltimore, MD/Washington
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Fxus61 klwx 260132
afdlwx
area forecast discussion
national weather service baltimore md washington dc
932 pm edt Tue jun 25 2019

Synopsis
High pressure will build from the tennessee valley toward the
region through the end of the week. A cold front may approach
from pennsylvania this weekend.

Near term through 6 am Wednesday morning most locations
have reached the 70s as temperatures continue to drop this
evening. A ridge of high pressure will keep us dry and quiet the
rest of the night with dewpoint temperatures lowering into the
upper 50s to lower 60s.

Short term Wednesday through Thursday night
A large high pressure ridge will provide quiet and seasonably
warm conditions Wednesday. A westerly flow Wednesday will keep
dewpoints from rising. Heat indices will be close to actual
temperatures during the day. Any chance of showers or
thunderstorms would be mainly along the maryland border.

Wednesday night will be quiet. Any showers or thunderstorms
along the maryland border early will dissipate with loss of
daytime heating and sunset.

By Thursday, flow backs slightly to the southwest, so the
humidity may rise slightly by then.

Subsidence should mostly inhibit convection Thursday too.

The forecast will remain dry.

Long term Friday through Tuesday
Mid-upper level ridge will be at its maximum amplitude over our cwa
thu and Fri with continued hot and dry conditions. Hottest
temperatures are expected Fri and possibly into Sat too. Digging
upper level closed low from james bay into northern new england
Sunday will help push a weak cold front through the area Sunday and
bring a slight reprieve to the hot weather (highs around 90 as
opposed to mid 90s) along with a chance of showers and thunderstorms
mainly to northern areas Sat afternoon and Sunday. Saturday could
turn out to be the hottest day just ahead of the frontal passage and
also when humidity is expected to be highest. It could be close to
heat advisory criteria in some areas Sat especially in the south.

Ridge tries to build from the west toward the middle of next week
with temperatures climbing back well into the 90s.

Aviation 02z Wednesday through Sunday
Vfr conditions will prevail through the valid TAF period.

Dewpoints will be low enough to preclude significant fog
development.

Hot temperatures will be the main concern for the rest of the
week. Risk of t-storms Sat and sun.

Marine
Light winds then gradually back southwest by Thursday. Local
onshore bay breeze effects expected each afternoon. Winds
anticipated to remain below small craft advisory thresholds
through the end of the week. Risk of thunderstorms Sat and sun
with a frontal passage.

Lwx watches warnings advisories
Dc... None.

Md... None.

Va... None.

Wv... None.

Marine... None.

Synopsis... Hts
near term... Hts klw
short term... Hts
long term... Lfr
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 64 mi61 min NW 2.9 G 4.1 82°F 80°F1014.2 hPa
BLTM2 - 8574680 - Baltimore, MD 69 mi61 min NW 4.1 G 6 83°F 80°F1013.2 hPa
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 72 mi61 min W 7 G 8 81°F 1013.6 hPa

Wind History for Washington, DC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Hagerstown, Washington County Regional Airport, MD10 mi62 minN 010.00 miFair79°F59°F50%1015.4 hPa
Eastern WV Regional Airport/Shepherd Field, WV15 mi62 minSW 310.00 miFair71°F60°F68%1014.4 hPa

Wind History from HGR (wind in knots)
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Last 24hrS6S7SW6S4SE7SE4S3W6SW4W7W12W8W5W8
G14
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NW9W10NW14NW12NW11NW9W6W3Calm
1 day agoE3SE5SE3E3CalmCalmCalmCalmCalmCalmCalmCalm54S7S5SW5S8S7S9S10S8S6S7
2 days agoNE3E4E4W3W3N7CalmCalmCalmCalmCalmE3W45NW4Calm5SW75W4S4S5SE4SE5

Tide / Current Tables for Chain Bridge, D.C.
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Chain Bridge
Click for Map
Tue -- 01:22 AM EDT     Moonrise
Tue -- 03:10 AM EDT     2.97 feet High Tide
Tue -- 05:44 AM EDT     Sunrise
Tue -- 05:48 AM EDT     Last Quarter
Tue -- 09:31 AM EDT     0.68 feet Low Tide
Tue -- 01:23 PM EDT     Moonset
Tue -- 03:23 PM EDT     2.84 feet High Tide
Tue -- 08:37 PM EDT     Sunset
Tue -- 09:39 PM EDT     0.44 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.82.42.832.92.51.91.30.90.70.711.62.22.62.82.82.51.91.30.80.50.50.7

Tide / Current Tables for Chain Bridge, one mile below, D.C.
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Chain Bridge
Click for Map
Tue -- 01:22 AM EDT     Moonrise
Tue -- 03:06 AM EDT     2.97 feet High Tide
Tue -- 05:44 AM EDT     Sunrise
Tue -- 05:48 AM EDT     Last Quarter
Tue -- 09:26 AM EDT     0.68 feet Low Tide
Tue -- 01:23 PM EDT     Moonset
Tue -- 03:18 PM EDT     2.84 feet High Tide
Tue -- 08:37 PM EDT     Sunset
Tue -- 09:34 PM EDT     0.44 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.82.52.832.82.41.91.30.90.70.711.62.32.72.82.82.41.91.20.70.50.50.7

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

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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.