Marine Weather and Tides
6/25/2017 - NOAA is having a major issue that impact the 7 day forecast load times. Many users are reporting problems. The issue has been reported.
5/23/2017 - Worked with NOAA again to speed up the 7 day forecast load times. Thanks to them for being responsive.
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.
|Sunrise 7:23AM||Sunset 6:16PM||Monday October 23, 2017 8:27 PM EDT (00:27 UTC)||Moonrise 9:49AM||Moonset 8:03PM||Illumination 15%|
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|ANZ538 Patapsco River Including Baltimore Harbor- 732 Pm Edt Mon Oct 23 2017 |
.gale warning in effect through Tuesday morning...
.small craft advisory in effect from Tuesday morning through Tuesday afternoon...
Tonight..SE winds 15 to 20 kt. Gusts up to 35 kt... Increasing to 40 kt after midnight. Waves 2 to 3 ft. Showers likely this evening, then showers with a slight chance of tstms after midnight. Vsby 1 to 3 nm...decreasing to 1 nm or less after midnight.
Tue..S winds 10 to 15 kt. Gusts up to 30 kt early in the morning. Waves 3 ft...subsiding to 1 ft in the afternoon. A chance of showers.
Tue night..NW winds 5 to 10 kt. Waves 1 ft.
Wed..W winds 5 to 10 kt. Waves 1 ft.
Wed night..NW winds 5 to 10 kt. Waves 1 ft.
Thu..W winds 5 to 10 kt. Waves 1 ft.
Thu night..SW winds around 5 kt. Waves 1 ft or less.
Fri..S winds around 5 kt. Waves 1 ft or less.
Sat..S winds around 5 kt. Waves 1 ft. A chance of showers through the night. Winds and waves higher and visibilities lower in and near tstms.
|ANZ500 732 Pm Edt Mon Oct 23 2017 |
Synopsis for the tidal potomac and md portion of the chesapeake bay.. A cold front will cross the waters tonight, followed by a secondary cold front Wednesday. High pressure will return late in the week.
7 Day Forecast for Marine Location Near Edgemere, MDHourly EDIT Help
Area Discussion for - Baltimore, MD/Washington  (on/off)  Help NOTE: mouseover dotted underlined text for definition
|Fxus61 klwx 232353|
area forecast discussion
national weather service baltimore md washington dc
753 pm edt Mon oct 23 2017
A cold front will move across the area late tonight
and push east of the chesapeake bay Tuesday morning. High
pressure will gradually build across the region during the
second half of the week.
Near term until 6 am Tuesday morning
Frontal boundary resides from ohio through khts to western south
carolina at this time. A line of thunderstorms continue just
east of this axis, near a plume of favorable moisture (dewpoints
in the 60s). Winds aloft will become increasingly favorable as
well, with a low level jet of 50-60 kt centered around 5000 ft.
Winds of 40 kt likely reach down to 1000 ft or so... Without any
mixing. Given these kinematics, shear profiles exceptionally
favorable. Instability, on the other hand, meager. It remains to
be seen how effectively severe gusts will mix. Its been good in
southwest virginia, but with the loss of daytime heating, that
trend should decrease. Have a tornado watch for nelson augusta
counties, where the threat the best.
That leaves the synoptic wind threat. Am quite concerned about
the ridges, and have issued a wind advisory for that. There will
be a certain amount of vertical transport in just showers. Am
uncertain of what the magic formula will be, but included
counties with several hundred feet elevation in the advisory.
That ended up as roughly i-95 west. The time fram of wind
concern roughly now through midnight or 06z along west of the
blue ridge. By midnight, the low level jet will spread east to
include the i-95 corridor, lasting until sunrise or just before.
Short term 6 am Tuesday morning through Wednesday night
Cdfnt will push east of the bay by 12z with showers ending.
Still mild under westerly flow. Upper trough axis crosses the
area Wed (gfs) or Wed night (ecmwf) with temps staying in the
60s during the day and 40s at night. Any precip would be
confined to the upslope areas.
Long term Thursday through Monday
Troughing will remain entrenched over the eastern CONUS through the
period as ridging persists out west and over the north atlantic.
This will lead to near normal temperatures late this week into the
weekend. A spoke of energy will rotate around an upper low stationed
just southwest of james bay likely bringing another period of
unsettled weather at some point next weekend, but timing placement
details remain fuzzy this far out.
Aviation 00z Tuesday through Saturday
Shallow line of convection will move across terminals tonight
first at kcho between 01z-03z and then across the rest of the|
terminals between 03z-09z. MVFR CIGS and wind gusts to 45-50 kt
can be expected with this line of showers.
MainlyVFR expected late in the week with light flow.
Winds are expected to strengthen rapidly tonight in response to
strengthening low-level jet. Main channel of the bay and lower
potomac should experience gale force winds easily while the
upper bay and upper potomac the winds will depend more on
strength intensity of convection. Think there could be a 3-hr
period where they also experience brief gales, so raised the
gale warning everywhere. Convective line moves east of the bay
by 15z Tue at the latest with winds diminishing and showers
ending. Smws may also be required later tonight.
Light flow with high pressure over the waters thu-fri.
Tides coastal flooding
Water levels are expected to rise quickly this evening as srly
flow strengthens. Estofs performing much better than etss as it
typically does in srly flow, but magnitude of surge is almost
always overestimated especially in the upper parts of the bay.
Don't have enough confidence to raise an advzy for baltimore and
havre de grace, but have enough confidence that annapolis will
experience minor coastal flooding for the next two high tide
cycles, so raised the advzy for them.
Lwx watches warnings advisories
Dc... Wind advisory until 6 am edt Tuesday for dcz001.
Md... Wind advisory until 6 am edt Tuesday for mdz003>006-011-
Coastal flood advisory until 1 pm edt Tuesday for mdz014.
Va... Wind advisory until 6 am edt Tuesday for vaz026>031-037>040-
Wv... Wind advisory until 6 am edt Tuesday for wvz050>053-055.
Marine... Gale warning until 8 am edt Tuesday for anz530>533-535>542.
Small craft advisory from 8 am to 6 pm edt Tuesday for
Gale warning until 3 pm edt Tuesday for anz534-543.
near term... Hts
short term... Lfr
long term... Dfh
aviation... Hts lfr dfh
marine... Lfr dfh
tides coastal flooding...
Weather Reporting StationsEDIT (on/off)  Help NOTE: Click on distance to see the station location on a map
|Stations||Dist||Age||Wind||Air Temp||Water Temp||Waves||Pressure||DewPt|
|FSKM2 - 8574728 - Francis Scott Key Bridge, MD||4 mi||40 min||1013.4 hPa|
|44043 - Patapsco, MD||5 mi||28 min||SE 16 G 18||70°F||67°F||2 ft||1014.3 hPa (-2.5)|
|BLTM2 - 8574680 - Baltimore, MD||8 mi||40 min||70°F||1013.2 hPa|
|TCBM2 - 8573364 - Tolchester Beach, MD||12 mi||40 min||67°F||1014.1 hPa|
|CPVM2||14 mi||58 min||72°F||68°F|
|APAM2 - 8575512 - Annapolis, MD||14 mi||40 min||1013.2 hPa|
|44063 - Annapolis||16 mi||28 min||SE 16 G 19||71°F||68°F||2 ft||1012.8 hPa (-2.4)|
|TPLM2 - Thomas Point, MD||20 mi||28 min||SE 22 G 24||72°F||68°F|
|BSLM2 - Chesapeake Bay, MD||31 mi||58 min||ESE 13||69°F||1013 hPa||64°F|
|44057 - Susquehanna, MD||32 mi||28 min||SE 14 G 18||70°F||69°F||1014.6 hPa (-2.1)|
|WASD2 - 8594900 - Washington, DC||37 mi||40 min||67°F||1012.2 hPa|
|CHCM2 - 8573927 - Chesapeake City, MD||42 mi||40 min||1015.5 hPa|
|44062 - Gooses Reef, MD||44 mi||28 min||S 21 G 25||72°F||69°F||3 ft||1013.3 hPa (-2.6)|
|CA2 - 8571892 - Cambridge, MD||48 mi||40 min||1014.9 hPa|
Wind History for Francis Scott Key Bridge, MD(wind in knots) EDIT (on/off)  Help
Airport ReportsEDIT (on/off)  Help Click EDIT to display multiple airports
|Baltimore, Inner Harbor, MD||10 mi||34 min||no data||mi||72°F||64°F||79%||1013.8 hPa|
|Baltimore / Martin, MD||11 mi||43 min||E 11 G 16||10.00 mi||Mostly Cloudy||72°F||66°F||83%||1014.6 hPa|
|Baltimore, Baltimore-Washington International Airport, MD||11 mi||34 min||ESE 13 G 20||10.00 mi||Overcast||72°F||64°F||76%||1013.3 hPa|
|Annapolis, United States Naval Academy, MD||15 mi||34 min||SE 17||10.00 mi||Overcast||72°F||68°F||87%||1013.8 hPa|
|Bay Bridge Field, MD||17 mi||48 min||SE 14||10.00 mi||Overcast||72°F||64°F||78%||1013.9 hPa|
|Fort Meade / Tipton, MD||17 mi||43 min||SE 9 G 16||10.00 mi||Overcast||70°F||62°F||78%||1014.2 hPa|
Wind History from BWI (wind in knots)
|1 day ago||Calm||Calm||Calm||Calm||Calm||Calm||Calm||Calm||Calm||Calm||Calm||Calm||Calm||E||E||SE||E||SE||SE||SE||SE||SE||SE||Calm|
|2 days ago||W||W||NW||NW||SW||Calm||Calm||Calm||W||Calm||Calm||W||Calm||Calm||E||SE||SE||E||E||E||SE||Calm||Calm|
EDIT RT Ports Option Weekend mode (on/off) (on/off)  Help One Week of Data
|North Point |
Click for Map
Mon -- 04:30 AM EDT 0.56 feet Low Tide
Mon -- 07:24 AM EDT Sunrise
Mon -- 09:29 AM EDT 1.14 feet High Tide
Mon -- 10:48 AM EDT Moonrise
Mon -- 03:18 PM EDT 0.25 feet Low Tide
Mon -- 06:15 PM EDT Sunset
Mon -- 09:03 PM EDT Moonset
Mon -- 10:11 PM EDT 1.61 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
EDIT (on/off)  Help One Week of Data
|Baltimore Harbor Approach |
Click for Map
Mon -- 02:29 AM EDT -0.97 knots Max Ebb
Mon -- 06:03 AM EDT 0.00 knots Slack
Mon -- 07:23 AM EDT Sunrise
Mon -- 08:38 AM EDT 0.55 knots Max Flood
Mon -- 10:47 AM EDT Moonrise
Mon -- 11:24 AM EDT -0.00 knots Slack
Mon -- 02:15 PM EDT -0.58 knots Max Ebb
Mon -- 04:56 PM EDT 0.00 knots Slack
Mon -- 06:15 PM EDT Sunset
Mon -- 08:31 PM EDT 0.96 knots Max Flood
Mon -- 09:03 PM EDT Moonset
Mon -- 11:54 PM EDT -0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Weather Map and Satellite Images(on/off)  Help
|Weather Map ||IR Satellite Image from GEOS|
GOES Local Image of Mid-Atlantic EDIT
Wind Forecast for Baltimore, MD/Washington (20,4,5,8)(on/off)  Help
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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.