Tuesday, March19, 2019 L-36.com


Marine Weather and Tides
St. James, MD

Version 3.4
What's New / NOTES
10/6/2018 Colors of tide XTide graphs changed to emphasize that they were upgraded. See next note. Comments welcome.
10/4/2018 I have fixed XTide and updated the harmonic files. There were some name changes so you might have to click EDIT to find the new station name.

Sunrise 7:14AMSunset 7:22PM Tuesday March 19, 2019 4:28 AM EDT (08:28 UTC) Moonrise 4:51PMMoonset 5:41AM Illumination 97% Phase: Waxing Gibbous; Moon at 13 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- 137 Am Edt Tue Mar 19 2019
Overnight..NW winds 5 kt. Waves less than 1 ft.
Tue..NW winds 5 kt. Waves less than 1 ft.
Tue night..S winds around 5 kt. Waves 1 ft.
Wed..S winds around 5 kt. Waves 1 ft.
Wed night..S winds 5 kt. Waves less than 1 ft. A chance of rain.
Thu..NW winds around 5 kt. Waves 1 ft. Rain likely.
Thu night..NW winds 5 kt. Waves less than 1 ft.
Fri..NW winds 5 to 10 kt. Waves 1 ft.
Sat..NW winds 5 to 10 kt. Waves 1 ft.
ANZ500 137 Am Edt Tue Mar 19 2019
Synopsis for the tidal potomac and md portion of the chesapeake bay.. High pressure will return for tonight through Wednesday. Low pressure will move northward along the coast Wednesday night, followed by a cold frontal passage Thursday. High pressure will return for late in the week into the weekend. A small craft advisory may be needed for portions of the waters later Wednesday through Friday.


7 Day Forecast for Marine Location Near St. James, MD
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location: 39.59, -77.77     debug


Area Discussion for - Baltimore, MD/Washington
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Fxus61 klwx 190752
afdlwx
area forecast discussion
national weather service baltimore md washington dc
352 am edt Tue mar 19 2019

Synopsis
High pressure will remain overhead through Wednesday. Coastal
low pressure will develop Wednesday night and it will pass
through the area Thursday. The low will move away from the area
Friday while high pressure approaches from the great lakes. The
high will build overhead Saturday before moving offshore early
next week.

Near term through tonight
High pressure will remain overhead through tonight, bringing dry
and chilly conditions. Highs today will be in upper 40s to lower
50s for most locations along with sunshine.

Some high clouds will move into the area tonight, but the cloud
deck should be thin. Therefore, radiational cooling is expected
and min temps will be chilly, ranging from the 20s in sheltered
valleys and rural areas to the mid 30s in downtown washington
and baltimore.

Short term Wednesday through Thursday night
High pressure will build to the south and east Wednesday, and a
return flow will allow for a milder afternoon despite high and
mid-level clouds overhead.

Northern stream energy will track through the ohio valley and
tennessee valleys Wednesday night. This energy will lead to the
development of coastal low pressure later Wednesday night, that
will pass through our area Thursday. There is still some
uncertainty as to how strong the low will be an how far west it
will track. However, latest guidance has trended stronger with
this system, which means that atlantic moisture would get drawn
into it. This seems to make sense given the potent ridge
upstream over the central conus. This would allow for the
northern stream system to dig farther south, causing coastal low
pressure to develop and strengthen as it tracks through our area.

Confidence is still low since guidance has just began to pick
up on this, but a soaking rain is possible later Wednesday night
and Thursday as the low passes through the area or nearby.

The low will continue to intensify as it moves off to the
northeast Thursday night and high pressure will build over the
central conus. A northwest flow will develop, and this will lead
to drier conditions Thursday night, but it will be blustery.

Long term Friday through Monday
An amplified, split flow pattern will be in place across the
conus for the first part of the long term period, with a closed
low over the intermountain west, ridging over the plains, and
another closed low developing over new england canadian
maritimes. The latter feature will affect the local area Friday,
as a second cold front rotates around the gyre and across the
area. Breezy conditions are expected with the deep surface low
to our northeast. A vort MAX may help in generating some low
topped showers. With the convective cloud layer eventually
intersecting the dendritic growth zone, some graupel could
occur, with snow in heavier showers at the highest elevations.

Lower elevations should have temperatures in the 50s though.

Surface high pressure will build in from the west over the
weekend. Cold air advection will peak Friday night into early
Saturday, so temperatures will likely remain a bit below normal.

Winds may still be a bit gusty Saturday before the high settles
overhead Saturday night. Temperatures will rebound Sunday as the
high moves offshore and ridging aloft moves closer. The weekend
should be dry.

There some model disagreement on how quickly the western low
breaks down and moves eastward, with potential low pressure
developing along a frontal zone moving southward from canada.

Chances for showers will begin increasing Monday or Monday
night. Temperatures may be dependent on frontal positioning, but
look to be near or above seasonal averages.

Aviation 07z Tuesday through Saturday
Vfr conditions are expected through Wednesday. Coastal low
pressure may bring rain and subvfr conditions Wednesday night,
and Thursday. Blustery northwest winds are expected behind the
system Thursday night.

Strong northwest winds will be the main hazard Friday, although
a stray shower can't be ruled out as a second front crosses the
area. Winds will gradually ease through Saturday as high
pressure builds in from the west. Ceilings visibility will
likely remain in theVFR category.

Marine
High pressure will remain over the waters through tonight. Winds
should remain below SCA criteria. High pressure will slowly
build to the south and east Wednesday. A return flow will
develop. Winds may come close to SCA criteria in the afternoon
but confidence is low due to a weak gradient.

Coastal low pressure may develop Wednesday night before passing
through our area Thursday and then off to the northeast Thursday
night. A small craft advisory may be needed for portions of the
waters during this time.

Gusty northwest winds will continue Friday. Small craft
advisories appear likely, and winds may approach gale force.

Winds will abate some through Saturday as high pressure moves
closer, but small craft advisories may need to continue.

Lwx watches warnings advisories
Dc... None.

Md... None.

Va... None.

Wv... None.

Marine... None.

Synopsis... Bjl
near term... Bjl
short term... Bjl
long term... Ads
aviation... Bjl ads
marine... Bjl ads


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
WASD2 - 8594900 - Washington, DC 63 mi41 min N 2.9 G 6 41°F 50°F1029.4 hPa
BLTM2 - 8574680 - Baltimore, MD 67 mi47 min N 5.1 G 8.9 40°F 45°F1028.6 hPa
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 71 mi41 min NNE 7 G 8 40°F 1028.9 hPa

Wind History for Washington, DC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Hagerstown, Washington County Regional Airport, MD9 mi36 minN 010.00 miFair33°F15°F48%1029.8 hPa
Eastern WV Regional Airport/Shepherd Field, WV17 mi36 minNW 310.00 miFair34°F16°F48%1028.9 hPa
Frederick Municipal Airport, MD24 mi44 minN 010.00 miFair30°F24°F80%1029.8 hPa

Wind History from HGR (wind in knots)
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Last 24hrNE5NW3NE5NE6N4E7CalmCalmW54NW6N5NW14NW9NW10NW8NW7NW6NW6N3N5N6CalmCalm
1 day agoW8W4W6W4NW13W9NW12
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NW10NW9NW9N4N4N4CalmSE4SE3CalmNE4N5
2 days agoW18
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Tide / Current Tables for Chain Bridge, D.C.
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Chain Bridge
Click for Map
Tue -- 02:22 AM EDT     0.00 feet Low Tide
Tue -- 06:36 AM EDT     Moonset
Tue -- 07:13 AM EDT     Sunrise
Tue -- 07:53 AM EDT     3.19 feet High Tide
Tue -- 02:40 PM EDT     -0.10 feet Low Tide
Tue -- 05:48 PM EDT     Moonrise
Tue -- 07:19 PM EDT     Sunset
Tue -- 08:18 PM EDT     3.33 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.80.400.10.71.72.533.22.92.31.60.90.40-0.10.41.32.333.33.22.72

Tide / Current Tables for Chain Bridge, one mile below, D.C.
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Chain Bridge
Click for Map
Tue -- 02:16 AM EDT     0.00 feet Low Tide
Tue -- 06:36 AM EDT     Moonset
Tue -- 07:13 AM EDT     Sunrise
Tue -- 07:48 AM EDT     3.19 feet High Tide
Tue -- 02:35 PM EDT     -0.10 feet Low Tide
Tue -- 05:48 PM EDT     Moonrise
Tue -- 07:19 PM EDT     Sunset
Tue -- 08:13 PM EDT     3.33 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.80.300.10.81.72.63.13.22.82.21.50.90.4-0-0.10.41.42.433.33.22.62

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 (4,6,7,8)
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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.