Tuesday, March31, 2020
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Marine Weather and Tides
Deale, MD

Version 3.4
NOTICE
12/16/2019 NOAA is having trouble with requests that include wind gusts. I am posting graphs without wind gusts until it gets fixed.
10/9/2019 Updated the Marine Zones.
9/4/2019 Fixed the weather maps due to NOAA moving them.
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.

Sunrise 6:49AMSunset 7:30PM Tuesday March 31, 2020 4:32 PM EDT (20:32 UTC) Moonrise 10:16AMMoonset 12:34AM Illumination 53% Phase: First Quarter Moon; Moon at 8 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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ANZ532 Chesapeake Bay From Sandy Point To North Beach- 142 Pm Edt Tue Mar 31 2020
.small craft advisory in effect from 9 pm edt this evening through Wednesday afternoon...
This afternoon..E winds 10 kt. Waves 1 ft. A chance of rain.
Tonight..NE winds 10 to 15 kt. Gusts up to 20 kt. Waves 2 ft. Rain likely.
Wed..N winds 10 to 15 kt with gusts to 20 kt. Waves 2 to 3 ft.
Wed night..NW winds 10 to 15 kt with gusts to 20 kt. Waves 1 to 2 ft.
Thu..NW winds 15 to 20 kt with gusts to 25 kt. Waves 2 to 3 ft.
Thu night..NW winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft.
Fri..N winds 10 to 15 kt...becoming ne 5 kt after midnight. Waves 1 to 2 ft.
Sat..SE winds 5 kt. Waves less than 1 ft.
ANZ500 142 Pm Edt Tue Mar 31 2020
Synopsis for the tidal potomac and md portion of the chesapeake bay.. Low pressure pushing swiftly across the deep south today will move offshore of south carolina this evening, then pass well south of the region on its way out to sea tonight into Wednesday. High pressure will slowly build in from the midwest through the end of the week. Small craft advisories may be needed Thursday into Friday.


7 Day Forecast for Marine Location Near Deale, MD
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location: 38.76, -76.53     debug


Area Discussion for - Baltimore, MD/Washington
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FXUS61 KLWX 311915 AFDLWX

Area Forecast Discussion National Weather Service Baltimore MD/Washington DC 315 PM EDT Tue Mar 31 2020

SYNOPSIS. Low pressure will move offshore of South Carolina this evening, then head out to sea Wednesday as it strengthens. High pressure will slowly build in from the Midwest through the end of the week. The high will gradually move offshore over the weekend. A cold front may approach from the Ohio Valley by early next week.

NEAR TERM /THROUGH WEDNESDAY/. Surface low pressure is over Georgia this afternoon with its associated overrunning rain shield extending up through the southern half of Virginia. While the previously mentioned backdoor front is losing its definition, there's still a notable demarcation with lower clouds and a cluster of showers across the Baltimore metro. While there could be some light rain along this boundary as it gradually continues its southwestward motion, the main area of rain will be moving up from the south. However, drier air will eventually work in behind the backdoor boundary, which will limit its northward progress. Thus locations near and north of US 50 may not see much rain at all, and even across far southern areas, amounts should be less than a half inch. Rain associated with the low will pivot to the southeast after midnight, while moist onshore flow may cause some light precip to linger until dawn along and west of the Blue Ridge. Temperatures along the highest ridges will be marginally supportive of snow, although amounts are expected to be below advisory levels. Low temperatures will settle into the mid 30s to lower 40s for most.

Upper level troughing will remain overhead on Wednesday, which will likely promote cloud cover to persist much of the day. A few showers are possible in the afternoon as a vort max crosses, mainly near and west of the Blue Ridge. With continued cold advection and cloud cover, temperatures will be held in the 50s.

SHORT TERM /WEDNESDAY NIGHT THROUGH THURSDAY NIGHT/. A secondary boundary will slip southward Wednesday night. It should be dry, but winds may pick up a bit. So even though low temperatures will be in the mid 30s to around 40, the probability of any frost is low.

Gusty winds will continue into Thursday between the deep low pressure off the coast and high pressure extending across the Great Lakes. Skies should be clearer overall though, with high temperatures in the mid 50s to the lower 60s. Lows will again be in the mid 30s to lower 40s as winds being to diminish.

LONG TERM /FRIDAY THROUGH TUESDAY/. Split zonal flow will be the story for Friday and Saturday, with little to no chance of precipitation either day. Meanwhile, surface ridge axis will be settled over the Ohio Valley, slowly moving east over the region later Saturday. Temperatures on both days will be seasonable, with highs in the upper 50s to low 60s.

A very weak cold front may push through the region on Sunday, but precipitation chances with this seem rather low at this point. If anything, just some light showers. Temperatures will be warmer though, as winds turn more southerly ahead of the approaching front, and behind the departing surface ridge. Highs expected to be closer to the mid 60s.

Not much of a temperature drop at all behind the aforementioned front, as highs on Monday expected to be in the upper 60s to near 70. This is a result of surface high pressure moving offshore of the northeastern U.S. and turning winds back out of the southeast once again. Showers will again be possible Monday.

AVIATION /19Z TUESDAY THROUGH SUNDAY/. Low pressure will be passing to the south through tonight, though its rain shield will only be grazing the area. A backdoor boundary has led to some showers and IFR conditions at MTN, though progress to BWI is uncertain as the showers lifted to the north. Elsewhere, VFR is continuing, but MVFR is expected to continue to overspread the area (from the south and northeast) during the late afternoon and evening. A period of IFR is possible this evening, but removed it from DCA/BWI/MTN, as drier air is progged to advect in behind the backdoor boundary. Rain shouldn't lower vsby below 3SM except perhaps at CHO. The drier air will bring rising ceilings late tonight into Wednesday morning as any chance of precipitation ends.

Upper level energy will keep VFR stratocumulus across the area Wednesday and perhaps a brief shower in the afternoon. Ceilings will clear out Wednesday night. Northwest winds will be gusty (up to 25 kt) on Thursday.

VFR conditions expected Friday and Saturday, as high pressure builds in from the west.

MARINE. SCA conditions likely to develop at least on part of the waters by this evening and continue into Wednesday as a low pressure passes to the south. Have expanded the advisory in both area and time based on latest guidance, and it's possible further expansions are possible. After a lull late Wednesday, another front combined with high pressure building in likely leads to another period of SCA conditions late Wednesday night and Thursday. SCA conditions may linger into Friday on portions of the water as the strong offshore low only slowly moves away.

No marine hazards expected on Saturday into Sunday, as high pressure will be building in from the west.

TIDES/COASTAL FLOODING. The tide forecast still has some uncertainty tonight into Wednesday due to distant but deep low pressure expected to pass south and east of the region. Generally onshore flow would result in increasing water levels. But the exact direction and strength of the winds, as well as the timing of a wind shift to a more northerly to northwesterly offshore direction will determine exactly how high water levels are able to get over the next several tide cycles. Right now, it appears minor inundation is most likely for the more sensitive sites during the Wednesday morning/midday high tide cycle.

LWX WATCHES/WARNINGS/ADVISORIES. DC . None. MD . None. VA . None. WV . None. MARINE . Small Craft Advisory from 9 PM this evening to 3 PM EDT Wednesday for ANZ531>533-539>542. Small Craft Advisory from 6 PM this evening to 6 PM EDT Wednesday for ANZ534-537-543.

SYNOPSIS . ADS NEAR TERM . ADS SHORT TERM . ADS LONG TERM . CJL AVIATION . ADS/CJL MARINE . ADS/CJL TIDES/COASTAL FLOODING . DHOF/ADS


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
BSLM2 - Chesapeake Bay, MD 10 mi123 min ENE 5.1 1012 hPa
TPLM2 - Thomas Point, MD 11 mi33 min E 18 G 20 46°F 52°F1013.4 hPa (-2.0)46°F
44062 - Gooses Reef, MD 15 mi33 min E 16 G 18 49°F 2 ft
APAM2 - 8575512 - Annapolis, MD 16 mi63 min 48°F 1012.5 hPa
CPVM2 18 mi63 min 47°F
WASD2 - 8594900 - Washington, DC 27 mi63 min E 4.1 G 8.9 55°F 56°F1011.9 hPa
CA2 - 8571892 - Cambridge, MD 28 mi63 min E 15 G 18 48°F 56°F1013.2 hPa
SLIM2 - 8577330 - Solomons Island, MD 31 mi63 min ESE 16 G 19 48°F 54°F1012.1 hPa
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 32 mi63 min E 15 G 17 47°F 1013 hPa
FSNM2 32 mi63 min E 13 G 15 46°F 1012.8 hPa
BLTM2 - 8574680 - Baltimore, MD 35 mi63 min SE 12 G 15 48°F 52°F1012.8 hPa
TCBM2 - 8573364 - Tolchester Beach, MD 35 mi99 min ESE 8.9 G 13 46°F 52°F1013.9 hPa
NCDV2 41 mi63 min SE 8 G 8.9 53°F 58°F1011 hPa
PPTM2 - 8578240 - Piney Point, MD 43 mi63 min SE 18 G 21
BISM2 - 8571421 - Bishops Head, MD 45 mi63 min E 12 G 15 49°F 57°F1012.3 hPa

Wind History for Cove Point LNG Pier, MD
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Annapolis, United States Naval Academy, MD15 mi39 minE 127.00 miOvercast48°F43°F83%1012.8 hPa
Bay Bridge Field, MD18 mi48 minE 710.00 miOvercast48°F44°F87%1013.2 hPa
Camp Springs / Andrews Air Force Base, MD19 mi97 minN 010.00 miMostly Cloudy54°F37°F54%1012.9 hPa

Link to 5 minute data for KADW

Wind History from ADW (wind in knots)
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Last 24hrCalmNW8
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N8N7CalmN4CalmCalmN4NW3N4CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalm
1 day agoSW3SE3SE6E7NE5--NE6NE6E4N5NE5CalmNE7E5E3CalmCalmCalmS3CalmSW4S8SW4W5
2 days agoE8E8NE8NE6NE3N9NE7NE5NE4CalmCalmN9NE7E3CalmCalmCalmCalmSE3S3SE3E8S6S6

Tide / Current Tables for Fairhaven, Herring Bay, Maryland
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Fairhaven
Click for Map
Tue -- 01:34 AM EDT     Moonset
Tue -- 02:37 AM EDT     0.15 feet Low Tide
Tue -- 06:51 AM EDT     Sunrise
Tue -- 09:23 AM EDT     1.16 feet High Tide
Tue -- 11:16 AM EDT     Moonrise
Tue -- 04:49 PM EDT     0.29 feet Low Tide
Tue -- 07:29 PM EDT     Sunset
Tue -- 09:56 PM EDT     0.74 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.40.30.20.20.20.40.60.91.11.21.110.90.70.50.40.30.30.30.50.60.70.70.7

Tide / Current Tables for Baltimore Harbor Approach, Maryland Current
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Baltimore Harbor Approach
Click for Map
Tue -- 01:34 AM EDT     Moonset
Tue -- 01:41 AM EDT     -0.00 knots Slack
Tue -- 04:40 AM EDT     -0.42 knots Max Ebb
Tue -- 06:50 AM EDT     Sunrise
Tue -- 07:16 AM EDT     0.00 knots Slack
Tue -- 11:11 AM EDT     0.85 knots Max Flood
Tue -- 11:14 AM EDT     Moonrise
Tue -- 02:48 PM EDT     -0.00 knots Slack
Tue -- 06:10 PM EDT     -0.75 knots Max Ebb
Tue -- 07:28 PM EDT     Sunset
Tue -- 10:06 PM EDT     0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.30.1-0.1-0.3-0.4-0.4-0.3-0.10.20.50.70.80.80.60.3-0.1-0.4-0.6-0.7-0.7-0.5-0.3-00.2

Weather Map
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wmap_A
GEOS Local Image of Mid-Atlantic    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.
Link to Loop



Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Baltimore, MD/Washington (16,3,4,5)
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Ground Weather Radar Station Dover AFB, DE
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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 numerous 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.