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 7:17AM||Sunset 5:22PM||Wednesday January 24, 2018 6:38 AM EST (11:38 UTC)||Moonrise 11:33AM||Moonset 12:00AM||Illumination 52%|
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|ANZ537 Tidal Potomac From Cobb Island To Smith Point- 332 Am Est Wed Jan 24 2018 |
.small craft advisory in effect through late tonight...
Rest of the overnight..W winds 10 kt. Waves 1 ft.
Today..NW winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft.
Tonight..NW winds 10 kt with gusts to 20 kt. Waves 2 ft.
Thu..NW winds 10 to 15 kt. Waves 2 ft.
Thu night..S winds around 5 kt. Waves flat.
Fri..S winds 5 to 10 kt. Waves 1 ft or less.
Fri night..S winds 5 to 10 kt. Waves 1 ft.
Sat..S winds 10 kt. Waves 1 ft. A chance of showers through the night.
Sun..W winds 5 to 10 kt. Waves 1 ft. Showers likely through the day, then a chance of showers through the night.
|ANZ500 332 Am Est Wed Jan 24 2018 |
Synopsis for the tidal potomac and md portion of the chesapeake bay.. A secondary cold front will cross the waters today into tonight. High pressure will build overhead Thursday and Friday, then move offshore Saturday. A cold front will approach from the west by Sunday. Small craft advisories may need to be extended into Thursday, and will likely be needed over the weekend.
7 Day Forecast for Marine Location Near St. George Island CDP, MDHourly EDIT Help
Area Discussion for - Baltimore, MD/Washington  (on/off)  Help NOTE: mouseover dotted underlined text for definition
|Fxus61 klwx 240853|
area forecast discussion
national weather service baltimore md washington dc
353 am est Wed jan 24 2018
A secondary cold front will cross the region late today into
tonight. High pressure will build overhead Thursday and Friday,
then move offshore Saturday. A cold front will affect the area
Sunday into Sunday night, followed by another area of high
pressure by midweek next week.
Near term through tonight
Tuesday's cold front has pushed into the western atlantic. A
secondary cold front is approaching the area from the lower
great lakes, aided by a stout 700-500 mb shortwave. Latest
nam GFS bufkit soundings show a thin saturated layer trapped
beneath a subsidence inversion around 4000 feet. This should
lead to periodic mountain wave clouds resulting in a partly to
mostly cloudy sky, with a general increase in cloud cover
through the afternoon as PVA increases ahead of the approaching
Despite the expected clouds and cooler 850 mb temps,
downsloping flow should allow highs to reach well into the 40s
in the lowlands.
After a lull in upslope snow showers during the day, scattered
to numerous snow showers should increase again this evening
coincident with the passage of the upper trough. Inversion
heights increase to around 7000 feet this evening as the
trough attendant surface cold front cross. Model soundings show
about 70-90% rh between 2500 and 7500 feet overnight and some
low-level instability, so the thought is that these factors
should allow a few flurries or even a snow shower to cross the
mountains. Little or no accumulation is expected east of the
highlands, though, with a quick inch likely on the western
A secondary pressure surge associated with the front should
keep winds up most of the night. This and expected clouds will
prevent ideal radiational cooling. Rather uniform low
temperatures should result, with 20s in the lowlands and teens
in the highlands.
Short term Thursday through Friday night
Any lingering snow showers over the western ridges should
quickly diminish Thursday morning as the upper trough departs.
Drying and subsidence should result in lots of sunshine. High
pressure building overhead likely causes winds to go pretty
light during the afternoon. So despite the sunshine and subtly
warmer temperatures aloft, Thursday may actually end up being a
little cooler than Wednesday for most of the area.
Ridging at the surface and aloft moves directly over the area
Thursday night through Friday. Some high clouds may spill over
the ridge at times, but generally clear conditions conditions
are expected. Light winds and mainly clear skies Thursday night
should allow temperatures in the outlying areas to fall close to
the dew points, which will still be in the lower 20s.
Moderation is expected Friday and Friday night as a light return
Long term Saturday through Tuesday
At the start of the long term period on Saturday, we are solidly
in a warm pattern as high pressure pushes east off the coast and
the next cold front approaches from the northwest. With the
front still off to the northwest on Saturday, expect it to
generally be a dry day with some clouds mixing with the sun, a
gusty south to southwest wind, and highs approaching 60. By
Saturday night, the front will continue slowly pushing toward
us, but its progress will be slowed as a wave of low pressure|
develops in response to a shortwave diving across the midwest.
Some showers may overspread the area, but right now the bulk of
the rain is likely to wait until Sunday, as the front and the
developing wave of low pressure crosses the region. Still
uncertain if there might be any thunder with this system, but
something to watch. Most guidance shifts the front through the
region by early evening, with drying and cooling trend expected
through Sunday night. Monday will be considerably cooler than
Sunday, but high pressure will still be hanging back well to the
west. As another upper level shortwave approaches, clouds will
likely linger and a few rain snow showers may even reach
locations east of the mountains, especially late in the day or
during the evening when instability is maximized. By Tuesday,
high pressure should be gaining a firmer control on our weather
as it slides east, and drier and sunnier weather should take
hold. Temps will be closer to normal, perhaps even slightly
below normal by this point, but still not expecting anything
like the cold we had early in the month.
Aviation 09z Wednesday through Sunday
MainlyVFR thru Fri night. Brief MVFR CIGS possible overnight
tonight as upper trough cold front cross. A flurry is possible
overnight with the front. No accums expected, but vsby could
briefly drop to MVFR as well (mainly INVOF mrb). NW winds 10 kts
gusts to 25 kts, peaking late this morning then again this
evening with two separate pressure surges. Winds become light
aob 10 kts Thu pm-fri.
Vfr likely prevails Saturday, but sub-vfr, potentially ifr
conditions are likely on Sunday as a cold front crosses the
region with showers. Gusty south winds Saturday into Sunday
morning will likely shift northwest by day's end Sunday.
Air temps are still relatively warmer than water temps tonight,
so despite NW flow cold advection, gusts have ceased. Allowed
sca to drop overnight. Gusts should increase again as diurnal
mixing increases after daybreak, and a subtle pressure surge
moves across. This surge will likely be reinvigorated by the
passage of a secondary cold front this evening, so keep the sca
into the overnight for all waters, and through the entire night
for the open waters. This latter portion may need to be extended
into Thursday morning before high pressure moves firmly
overhead, resulting in light winds Thu pm-fri.
High pressure sliding east of the region combined with an
approaching cold front from the west will result in an
increasingly strong southerly flow. Small craft advisories will
likely be needed Saturday and Sunday.
Lwx watches warnings advisories
Marine... Small craft advisory until 2 am est Thursday for anz530>532-
Small craft advisory until 6 am est Thursday for anz533-534-
near term... Dhof
short term... Dhof
long term... Rcm
aviation... Rcm dhof
marine... Rcm dhof
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|
|LWTV2 - 8635750 - Lewisetta, VA||4 mi||50 min||W 5.1 G 5.1||39°F||37°F||1016 hPa|
|PPTM2 - 8578240 - Piney Point, MD||7 mi||50 min||W 2.9 G 4.1|
|44042 - Potomac, MD||9 mi||48 min||NNW 3.9 G 5.8||38°F||1015.3 hPa|
|SLIM2 - 8577330 - Solomons Island, MD||20 mi||50 min||NNW 6 G 8.9||41°F||35°F||1015.6 hPa|
|COVM2 - 8577018 - Cove Point LNG Pier, MD||26 mi||50 min||NW 8.9 G 9.9||44°F||1016.4 hPa|
|BISM2 - 8571421 - Bishops Head, MD||27 mi||50 min||WSW 6 G 7||39°F||40°F||1015.9 hPa|
|NCDV2||34 mi||50 min||NW 2.9 G 4.1||43°F||36°F||1015.3 hPa|
|44058 - Stingray Point, VA||35 mi||48 min||WSW 3.9 G 3.9||39°F||1017.2 hPa|
|44062 - Gooses Reef, MD||36 mi||48 min||W 7.8 G 9.7||42°F||1015.9 hPa|
|RPLV2 - 8632837 - Rappahannock Light, VA||43 mi||50 min||W 8.9 G 9.9||1016.6 hPa|
|CA2 - 8571892 - Cambridge, MD||43 mi||50 min||43°F||35°F||1016.2 hPa|
|YRSV2 - Chesapeake Bay,VA||45 mi||68 min||WSW 1.9||33°F||1017 hPa||30°F|
Wind History for Lewisetta, VA(wind in knots) EDIT (on/off)  Help
Airport ReportsEDIT (on/off)  Help Click EDIT to display multiple airports
|St. Inigoes, Webster Field, Naval Electronic Systems Engineering Activity, MD||8 mi||45 min||N 0||10.00 mi||Fair||33°F||30°F||89%||1015.7 hPa|
|Patuxent River, Naval Air Station, MD||18 mi||46 min||NW 3||10.00 mi||Fair||36°F||28°F||76%||1015.7 hPa|
|St Marys County Airport, MD||19 mi||61 min||WNW 5||10.00 mi||Partly Cloudy||36°F||28°F||75%||1016.3 hPa|
|Tappahannock-Essex County Airport, VA||24 mi||43 min||W 3||10.00 mi||Fair||38°F||28°F||66%||1016.6 hPa|
Wind History from NUI (wind in knots)
|1 day ago||S||S||S||S||S||S||S||S||SE||SE||SE||SE||S||E||SE||SE||SE||SE||SE||SE||S||SE|
|2 days ago||Calm||Calm||Calm||W||S||SE||SE||SE||SE||SE|
EDIT RT Ports Option Weekend mode (on/off) (on/off)  Help One Week of Data
|Lynch Point |
Click for Map
Wed -- 12:26 AM EST -0.09 feet Low Tide
Wed -- 06:42 AM EST 1.31 feet High Tide
Wed -- 07:16 AM EST Sunrise
Wed -- 11:33 AM EST Moonrise
Wed -- 01:13 PM EST -0.00 feet Low Tide
Wed -- 05:20 PM EST Sunset
Wed -- 05:20 PM EST First Quarter
Wed -- 07:16 PM EST 1.19 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
EDIT (on/off)  Help One Week of Data
|Point Patience |
Click for MapFlood direction 315° true
Ebb direction 145° true
Wed -- 02:10 AM EST 0.00 knots Slack
Wed -- 04:33 AM EST 0.52 knots Max Flood
Wed -- 07:16 AM EST Sunrise
Wed -- 07:34 AM EST -0.00 knots Slack
Wed -- 11:15 AM EST -0.61 knots Max Ebb
Wed -- 11:32 AM EST Moonrise
Wed -- 03:26 PM EST 0.00 knots Slack
Wed -- 04:50 PM EST 0.23 knots Max Flood
Wed -- 05:19 PM EST Sunset
Wed -- 05:20 PM EST First Quarter
Wed -- 06:42 PM EST -0.00 knots Slack
Wed -- 10:53 PM EST -0.68 knots Max Ebb
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 (6,6,7,8)(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.