Friday, March24, 2017 L-36.com


Marine Weather and Tides
St. James, MD

Version 3.4
What's New / NOTES
5/19/2016 - There were issues with the 3 day airport observation history. I switched to another data source. Let me know if you see any issues with the data feeds.
3/12/2015 - Added section for Gulf current for users in the GMZ marine zones.
This was requested by a user. If you have requests, please let me know.

Sunrise 7:04AMSunset 7:29PM Friday March 24, 2017 12:22 AM EDT (04:22 UTC) Moonrise 4:06AMMoonset 2:52PM Illumination 12% Phase: Waning Crescent; Moon at 26 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- 1031 Pm Edt Thu Mar 23 2017
.small craft advisory in effect Friday afternoon...
Rest of tonight..S winds 5 kt. Waves less than 1 ft.
Fri..S winds 10 to 15 kt with gusts to 25 kt. Waves 1 ft.
Fri night..SW winds 5 to 10 kt. Waves 1 ft.
Sat..SW winds around 5 kt. Waves 1 ft.
Sat night..S winds around 5 kt. Waves 1 ft or less.
Sun..SE winds 5 to 10 kt. Waves 1 ft. A chance of showers.
Sun night..SE winds 5 to 10 kt. Waves 1 ft. Showers likely.
Mon..SE winds around 5 kt. Waves 1 ft. Showers likely in the morning...then a chance of showers through the night.
Tue..NW winds around 5 kt. Waves 1 ft. A chance of showers.
ANZ500 1031 Pm Edt Thu Mar 23 2017
Synopsis for the tidal potomac and md portion of the chesapeake bay.. High pressure will slide offshore tonight, allowing a warm front to lift through the area on Friday. A low pressure system will then approach the area Sunday, and move through Sunday night into Monday. Small craft advisories may be needed for portions of the waters Friday night and again Sunday and Sunday night.

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 240037
afdlwx
area forecast discussion
national weather service baltimore md/washington dc
837 pm edt Thu mar 23 2017

Synopsis
High pressure will shift offshore tonight. A warm front will
cross the region Friday. A low pressure system will then
approach the region on Sunday, and cross the area Sunday night
into Monday.

Near term /until 6 am Friday morning/
High pressure will move offshore tonight and a warm front will
approach the area from the west overnight. A southerly flow will
allow for milder conditions compared to Wednesday night.

However... Radiational cooling will still cause min temps to drop
into the upper 20s to the middle 30s across most areas.

Clouds will increase overnight as the warm front approaches. A
period of rain is possible toward morning... Especially across
northern maryland... Eastern west virginia and northern virginia.

Confidence in precipitation remains low since most of the lift
associated with the warm front will be over pennsylvania.

However... A period of light rain cannot be ruled out. Temps
will be near freezing across northern maryland... Eastern west
virginia and extreme northern virginia. Pockets of freezing rain
cannot be ruled out. Confidence is too low for an advisory at
this time.

Short term /6 am Friday morning through Saturday night/
Aforementioned band of light precipitation will be moving from
west to east near the northern extent of our forecast area
Friday morning. Again while the bulk of the precipitation will
remain across pennsylvania, some light rain and patches of
freezing rain are possible, especially across eastern west
virginia and northern maryland. Any pockets of freezing rain
will be over by 9 am as temperatures rise above freezing across
all locations. After warm frontal passage, the afternoon should
warm significantly with breaks of Sun and highs reaching the
upper 50s to mid 60s.

Dry and mild conditions expected Friday night with lows only in
the 40s to around 50f. Frontal boundary will remain north of the
region on Saturday with mainly dry conditions and warm southerly
flow. Despite high clouds, should see temperatures rise to near
or above 70f pretty much area-wide.

Closed low pressure system will be moving towards the great
lakes region Saturday night with high pressure building into the
canadian maritimes. This will strengthen the frontal boundary
over the northeastern united states, and may push it back
southwestward towards the region overnight as a backdoor front.

However, even so, we should still remain mild, with lows near
50f. Dry conditions expected for most of the area.

Long term /Sunday through Thursday/
Unsettled weather expected for parts of the long
term as frontal boundaries stall nearby and southerly flow brings
gulf moisture over our area. Sunday into Monday, a low pressure
system moves east over the southern great lakes and into the ne
us as a frontal boundary stalls north of us. A brief dry period
is possible Monday night before another low pressure and its
front affects our area Tuesday into Wednesday. Conditions start
drying on Wednesday and into Thursday as high pressure builds
into the area. Temperatures will be above normal, with high
temperatures in the 50s and 60s, with some 70s on Monday and
Tuesday. Low temperatures will be in the 40s and 50s, with 30s
Wednesday night.

Aviation /01z Friday through Tuesday/
Expecting mainlyVFR through Saturday night. There may be a band
of light precipitation that crosses the northern terminals late
Friday morning, but no significant reductions to ceilings or
visibilities are expected. There is the threat of some patches
of light freezing rain, with highest risk at mrb but even across
this area confidence is low.

Winds will become southerly and a bit gusty, up to 20 knots or
so, on Friday, slackening somewhat on Saturday.

Unsettled weather Sunday into Monday as frontal
boundaries stall near our area. Brief period of dry conditions
Monday night before another front approaches on Tuesday. Sub-vfr
conditions possible most of this period.

Marine
Southerly flow will increase tonight as a warm front
approaches, with SCA threat spreading up the bay and portions of
the tidal potomac overnight and then to the adjacent waters
during the day Friday. Winds should diminish somewhat for Friday
night and Saturday. Gusts may be near SCA criteria Friday night
but with the water likely remaining cooler than the surrounding
air mass, the lack of mixing will reduce gusts over the waters
for Friday night through Saturday night.

Unsettled weather Sunday into Monday as frontal
boundaries stall near our area. Brief period of dry conditions
Monday night before another front approaches on Tuesday. Small
craft advisories may be needed for portions of the waters Sunday
into Sunday night ahead of the front.

Lwx watches/warnings/advisories
Dc... None.

Md... None.

Va... None.

Wv... None.

Marine... Small craft advisory from midnight tonight to 6 pm edt Friday
for anz531>534-537-539>541-543.

Small craft advisory from noon to 6 pm edt Friday for anz535-
536-538.

Small craft advisory from 6 am to 6 pm edt Friday for anz530-
542.

Synopsis... Mm
near term... Bjl/mm
short term... Mm
long term... Bjl/imr
aviation... Bjl/mm/imr
marine... Bjl/mm/imr


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
WASD2 - 8594900 - Washington, DC 63 mi52 min SSE 5.1 G 6 39°F 47°F1034.5 hPa
BLTM2 - 8574680 - Baltimore, MD 67 mi52 min SW 4.1 G 5.1 39°F 44°F1034.3 hPa
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 71 mi52 min S 8.9 G 9.9 40°F 1034.5 hPa

Wind History for Washington, DC
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E4
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Hagerstown, Washington County Regional Airport, MD9 mi29 minSE 910.00 miFair40°F10°F30%1032.3 hPa
Eastern WV Regional Airport/Shepherd Field, WV17 mi29 minSE 410.00 miFair35°F12°F40%1031.3 hPa
Frederick Municipal Airport, MD24 mi47 minN 010.00 miFair32°F23°F69%1034.2 hPa

Wind History from HGR (wind in knots)
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Last 24hrNE4E3N4CalmCalmN4N5CalmN7NE6Calm3SW83E3S5S5S8S7SE5SE4E5SE7SE9
1 day agoN6NW12NW8NW16NW19
G24
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N13NW6NW8NE34NW5
2 days agoE3N6N6NE3NW5N6N7N4CalmNW4W3CalmNW9NW12NW14NW14NW10NW6W5SW6SW6CalmW5W5

Tide / Current Tables for Chain Bridge, Washington, D.C.
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Chain Bridge
Click for Map
Fri -- 12:42 AM EDT     0.43 feet Low Tide
Fri -- 05:02 AM EDT     Moonrise
Fri -- 06:31 AM EDT     2.81 feet High Tide
Fri -- 07:05 AM EDT     Sunrise
Fri -- 12:53 PM EDT     0.38 feet Low Tide
Fri -- 03:50 PM EDT     Moonset
Fri -- 06:45 PM EDT     2.93 feet High Tide
Fri -- 07:24 PM EDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.50.40.71.42.12.52.82.82.41.91.30.80.50.40.61.11.92.52.92.92.72.21.61

Tide / Current Tables for Chain Bridge, D.C.
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Chain Bridge
Click for Map
Fri -- 12:41 AM EDT     0.39 feet Low Tide
Fri -- 05:02 AM EDT     Moonrise
Fri -- 06:31 AM EDT     2.86 feet High Tide
Fri -- 07:05 AM EDT     Sunrise
Fri -- 12:52 PM EDT     0.35 feet Low Tide
Fri -- 03:50 PM EDT     Moonset
Fri -- 06:45 PM EDT     2.98 feet High Tide
Fri -- 07:24 PM EDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.50.40.71.42.12.62.82.82.51.91.30.70.40.40.51.122.62.932.72.21.61

Weather Map and Satellite Images
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Weather Map
wmap_A
IR Satellite Image from GEOS
east_satellite

GOES Local Image of Mid-Atlantic    EDIT
Geos

Wind Forecast for Baltimore, MD/Washington (0,6,7,8)
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Ground Weather Radar Station Sterling, VA
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weather_mapweather_map weather_map

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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.