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 6:26AM||Sunset 7:50PM||Wednesday August 23, 2017 4:21 AM EDT (08:21 UTC)||Moonrise 7:20AM||Moonset 8:09PM||Illumination 1%|
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|ANZ532 Chesapeake Bay From Sandy Point To North Beach- 258 Am Edt Wed Aug 23 2017 |
.small craft advisory in effect until 5 am edt early this morning...
Overnight..W winds 10 kt with gusts to 20 kt. Waves 2 ft. A chance of showers.
Wed..N winds 5 to 10 kt. Waves 1 to 2 ft.
Wed night..N winds 5 to 10 kt. Waves 1 ft.
Thu..NE winds 5 to 10 kt. Waves 1 ft.
Thu night..N winds 5 kt. Waves less than 1 ft.
Fri..N winds 5 kt. Waves less than 1 ft.
Fri night..N winds 5 to 10 kt. Waves 1 ft.
Sat..NE winds 5 to 10 kt. Waves 1 ft.
Sun..E winds 5 to 10 kt. Waves 1 ft.
|ANZ500 258 Am Edt Wed Aug 23 2017 |
Synopsis for the tidal potomac and md portion of the chesapeake bay.. A cold front will cross the waters late tonight into early Wednesday. High pressure will return for the second half of the week.
7 Day Forecast for Marine Location Near Galesville, MDHourly EDIT Help
Area Discussion for - Baltimore, MD/Washington  (on/off)  Help NOTE: mouseover dotted underlined text for definition
|Fxus61 klwx 230742|
area forecast discussion
national weather service baltimore md washington dc
342 am edt Wed aug 23 2017
A cold front will drop southeastward across the mid-atlantic region
today, before stalling over southeast virginia tonight. Upper level
energy will sweep southeastward tomorrow and push the front offshore
tomorrow night. High pressure will quickly follow tomorrow night and
persist right on into the weekend.
Near term through tonight
Current radar shows a few patches of light rain showers in parts of
central maryland and in parts of the northern shenandoah valley. A
cold front extends across southern pennsylvania in the vicinity of
the mason-dixon line but angled from north of harrisburg,
pennsylvania to near cumberland, maryland. This front will continue
to move toward the south-southeast, generate additional scattered
showers, and slide across our entire region today into this evening.
Any rain showers that do develop ahead of or along the front should
produce a few hundredths of an inch to one tenth of an inch this
morning through midday. Showers or perhaps any thunderstorms could
develop during the afternoon but would be mainly across or near
southern maryland and between fredericksburg and richmond in eastern
virginia. Heavier downpours could occur with this activity as
precipitable water values are at or near the 2 inch mark. It is
during the late afternoon and evening hours that the cold front is
expected to stall, bisecting the DELMARVA peninsula and extending
southwestward into southeast virginia. As we proceed into the
overnight hours, clouds and precipitation chances decrease and slide
to the east. Temperatures will be nearly 10 degrees cooler than
yesterday across much of our region with humidity values on the
downward trend as well. High temperatures will be mainly in the
middle 80s with low temperatures tonight dropping down into the
Short term Thursday through Friday night
Thursday will consist of two factors of weather. One of them an
upper level disturbance dropping out of the lower great lakes region
into the mid-atlantic region. This disturbance will help to kick the
stalled front over southeast virginia out to sea and could produce a
couple of sprinkles in the northern potomac highlands. The other
factor will be a firm ridge of high pressure that will build in from
the northwest about the same time as the disturbance moves
southeastward. The high pressure will strengthen behind the passing
disturbance to give us a couple of periods of dry conditions and
comfortable temperatures from Thursday right through Friday night.
High temperatures Thursday and Friday will be near 80 with low
temperatures Thursday night and Friday in the upper 50s to near
Long term Saturday through Tuesday
The weekend forecast will still be dictated by high pressure over
northern new england. As has been advertised for a couple of days,
temperatures humidity levels will be almost fall-like. The only
precipitation potential will come over the mountains at the end of
the day... And that would be limited to a stray shower.
Little will change for early next week, other than the center of the
high will move offshore. That could lead to a bit more moisture
flowing onshore, which may enhance diurnal terrain showers.
We're still talking about a small chance, with isolated to perhaps
at worst scattered coverage. And since water temperatures are in the
upper 70s, forecast air temperatures wouldn't change much.
Aviation 08z Wednesday through Sunday
Vfr conditions expected at all terminals through Friday night. Any
stray showers near the cho terminal would be mainly this morning and
reduce conditions to MVFR briefly. Winds will be variable around 5
knots most of today ahead of the cold front but are expected to
shift to the northwest at 5 to 10 knots with higher gusts once the
front has passed across the terminals. Winds will be generally
northwest to north 5 to 10 knots tonight through Friday night with
typical diurnal fluctuations each afternoon.
Vfr conditions anticipated this weekend under high pressure.
No marine hazards expected today and tonight. Small craft advisories
may be needed Thursday with diurnal heating during the day and cool
advection aloft. No marine hazards expected Thursday night
through Friday night.
Winds this weekend should be light (at or below 10 kt) under the
influence of high pressure.
Tides coastal flooding
Water levels are presently running between a half and three-quarters
of a foot above astronomical predictions. As a cold front crosses
the area, winds will gradually veer west, and then northwest, which
should assist in blowing the tides out of the area. Even in advance
of the front, departures in the virginia waters are lower than the
maryland waters, which suggests that departures won't rise further,
and will have an opportunity to drop this morning.
The latest guidance suggests that annapolis will be on the cusp of
minor flooding. If the current anomaly holds, then annapolis will
peak right at the 2.4 ft minor criteria. Do not have the confidence
that this will won't happen. Since its a difference of an inch, will
hold off for now. May need to issue a short fused advisory if i'm
All other sites forecast to crest under thresholds, although some
action stages will be threatened.
Lwx watches warnings advisories
Marine... Small craft advisory until 5 am edt early this morning for
near term... Klw
short term... Klw
long term... Hts
aviation... Klw hts
marine... Klw hts
tides coastal flooding... Hts
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|
|TPLM2 - Thomas Point, MD||6 mi||82 min||W 6 G 6||81°F||81°F|
|44063 - Annapolis||9 mi||42 min||NNW 5.8 G 5.8|
|APAM2 - 8575512 - Annapolis, MD||10 mi||52 min||79°F||1008.6 hPa|
|BSLM2 - Chesapeake Bay, MD||11 mi||112 min||Calm||76°F||1009 hPa||72°F|
|CPVM2||13 mi||52 min||80°F||74°F|
|44062 - Gooses Reef, MD||21 mi||42 min||WSW 5.8 G 9.7||82°F||1009.8 hPa|
|44043 - Patapsco, MD||22 mi||42 min||W 7.8 G 9.7||80°F||1009.5 hPa|
|FSKM2 - 8574728 - Francis Scott Key Bridge, MD||25 mi||52 min||WSW 8 G 9.9||78°F||1008.8 hPa|
|WASD2 - 8594900 - Washington, DC||26 mi||52 min||WNW 1.9 G 2.9||80°F||83°F||1009 hPa|
|TCBM2 - 8573364 - Tolchester Beach, MD||29 mi||52 min||WNW 5.1 G 7||79°F||83°F||1009.3 hPa|
|BLTM2 - 8574680 - Baltimore, MD||29 mi||52 min||WSW 4.1 G 6||77°F||84°F||1008.6 hPa|
|CA2 - 8571892 - Cambridge, MD||31 mi||52 min||80°F||83°F||1010.1 hPa|
|COVM2 - 8577018 - Cove Point LNG Pier, MD||32 mi||52 min||NW 8 G 8.9||80°F||1010 hPa|
|SLIM2 - 8577330 - Solomons Island, MD||37 mi||52 min||NW 5.1 G 7||81°F||82°F|
|NCDV2||45 mi||52 min||NW 1 G 2.9||80°F||83°F||1008.6 hPa|
|PPTM2 - 8578240 - Piney Point, MD||49 mi||52 min||WSW 8 G 11|
Wind History for Francis Scott Key Bridge NE Tower, MD(wind in knots) EDIT (on/off)  Help
Airport ReportsEDIT (on/off)  Help Click EDIT to display multiple airports
|Annapolis, United States Naval Academy, MD||9 mi||88 min||W 3||10.00 mi||Fair||81°F||73°F||79%||1009.1 hPa|
|Bay Bridge Field, MD||14 mi||37 min||WNW 4||10.00 mi||Fair||79°F||71°F||79%||1009.1 hPa|
|Camp Springs / Andrews Air Force Base, MD||18 mi||84 min||N 0||7.00 mi||Fair||78°F||67°F||70%||1009.8 hPa|
|Fort Meade / Tipton, MD||21 mi||34 min||W 3||10.00 mi||Mostly Cloudy||72°F||69°F||94%||1010.2 hPa|
|College Park Airport, MD||23 mi||34 min||WSW 3||10.00 mi||Overcast||77°F||67°F||73%||1009.5 hPa|
Wind History from ADW (wind in knots)
|1 day ago||Calm||Calm||Calm||Calm||S||S||S||S||S||S||S||S||S||S||S||SW||S||SW||S||S||S||SW||SW||SW|
|2 days ago||Calm||N||N||N||N||N||N||N||N||Calm||NE||W||W||N||SE||E||S||Calm||Calm||Calm||Calm||Calm||Calm||SE |
EDIT RT Ports Option Weekend mode (on/off) (on/off)  Help One Week of Data
|Shady Side |
Click for Map
Wed -- 12:31 AM EDT 0.33 feet Low Tide
Wed -- 06:27 AM EDT Sunrise
Wed -- 06:28 AM EDT 1.55 feet High Tide
Wed -- 08:20 AM EDT Moonrise
Wed -- 01:28 PM EDT 0.35 feet Low Tide
Wed -- 06:53 PM EDT 1.35 feet High Tide
Wed -- 07:49 PM EDT Sunset
Wed -- 09:09 PM EDT Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
EDIT (on/off)  Help One Week of Data
|Baltimore Harbor Approach |
Click for Map
Wed -- 12:40 AM EDT -0.87 knots Max Ebb
Wed -- 03:35 AM EDT 0.00 knots Slack
Wed -- 06:26 AM EDT Sunrise
Wed -- 06:50 AM EDT 1.03 knots Max Flood
Wed -- 08:19 AM EDT Moonrise
Wed -- 10:00 AM EDT -0.00 knots Slack
Wed -- 01:11 PM EDT -1.05 knots Max Ebb
Wed -- 04:25 PM EDT 0.00 knots Slack
Wed -- 07:26 PM EDT 0.93 knots Max Flood
Wed -- 07:48 PM EDT Sunset
Wed -- 09:09 PM EDT Moonset
Wed -- 10:32 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 (4,6,7,8)(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.