Saturday, January25, 2020
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Marine Weather and Tides
Grasonville, 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 7:14AMSunset 5:18PM Saturday January 25, 2020 3:38 PM EST (20:38 UTC) Moonrise 7:59AMMoonset 6:05PM Illumination 1% Phase: New Moon; Moon at 1 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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ANZ540 Eastern Bay- 1239 Pm Est Sat Jan 25 2020
This afternoon..W winds 10 kt. Waves 1 ft. Scattered showers. Vsby 1 to 3 nm.
Tonight..W winds 5 to 10 kt. Waves 1 ft.
Sun..W winds 10 kt. Waves 1 ft.
Sun night..W winds 5 to 10 kt. Waves 1 ft.
Mon..W winds 5 to 10 kt. Waves 1 ft.
Mon night..NW winds 10 kt. Waves 1 ft.
Tue..NW winds 5 to 10 kt. Waves 1 ft.
Wed..N winds 5 kt. Waves less than 1 ft.
ANZ500 1239 Pm Est Sat Jan 25 2020
Synopsis for the tidal potomac and md portion of the chesapeake bay.. A low pressure system will move away from the waters through tonight. Northwest flow ahead of weak high pressure will build behind this system. Small craft advisories may be required Monday night into Tuesday.


7 Day Forecast for Marine Location Near Grasonville, MD
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location: 38.88, -76.25     debug


Area Discussion for - Philadelphia/Mount Holly, PA
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FXUS61 KPHI 251800 AFDPHI

Area Forecast Discussion National Weather Service Mount Holly NJ 100 PM EST Sat Jan 25 2020

SYNOPSIS. Low pressure and an associated cold front will cross the Middle Altantic region today. The low will further deepen as it moves across New England tonight and into Sunday. High pressure will then begin to build across the area early next week. A weak low will pass well south of the area Tuesday. The next storm will affect the area towards the end of the week and into early next weekend.

NEAR TERM /UNTIL 6 PM THIS EVENING/. Weak low pressure was located in southwestern New Jersey around midday. The low will progress to the northeast, across southern New Jersey and off the coast this afternoon.

Meanwhile, a middle level low was drifting across southeastern Michigan. The pattern was drawing a significant amount of moisture northward from the Caribbean and the Atlantic waters off the Southeast Coast. A band of heavy rain extended up into central and northern New Jersey around midday.

The back edge of the rain will continue to lift northeastward this afternoon, and it is expected to be out of New Jersey before sunset.

Temperatures have risen above the freezing mark in the elevated terrain of the Pocono Region and far northern New Jersey. As a result, freezing rain is no longer a concern there.

Temperatures will continue to range from the 30s in our northern counties to the 50s in the south. The wind is expected to settle into the west around 10 mph.

SHORT TERM /6 PM THIS EVENING THROUGH 6 PM SUNDAY/. Tonight . While a spotty rain or snow shower will be possible across the far north on developing westerly flow, the vast majority of tonight will be dry as today's storm pulls away to the north. Cooler air will start to bleed into the region, but only gradually as lows will only drop into the low 30s for most.

Sunday . Westerly flow continues on Sunday as both surface and upper level areas of low pressure move further north. Should be a mainly dry day but probably plenty of stratocumulus especially to the northwest with steep low level lapse rates. A sprinkle or flurry is possible across the Poconos and northern NJ. Otherwise, Sunday looks like a rather nice day. Despite the westerly flow there is no cold air to the northwest to tap into (a common theme this winter) so highs will end up mostly a few degrees above average: upper 30s and low 40s to the north with mid to upper 40s further south. The pressure gradient behind the departing low is not strong, and wind gusts Sunday should only reach 20-25mph.

LONG TERM /SUNDAY NIGHT THROUGH FRIDAY/. The long term forecast was not edited overnight due to focus on near term concerns. Looks to be a mainly quiet and high pressure dominated week until perhaps the very end of the week or next weekend, but very low confidence on any potential storminess for that period. The previous long term discussion is included below.

Fairly quiet weather expected as low pressure continues to move away over Atlantic Canada while high pressure will gradually build down from the north and west with time. This will keep the region predominately in a dry W/NW flow through most of next week. Most days should feature a good deal of sunshine though some shortwaves riding through the upper level flow will bring some cloudier periods from time to time. Temperatures look to generally be near to a little above late January averages. Early indications are that the next storm system could impact the area next weekend but it's too early to forecast any specifics with this system.

AVIATION /18Z SATURDAY THROUGH THURSDAY/. The following discussion is for KPHL, KPNE, KTTN, KABE, KRDG, KILG, KMIV, KACY and surrounding areas.

This afternoon . IFR ceilings gradually improving to MVFR or VFR as rain continues to lift to the northeast of our region. The wind should settle into the west around 10 knots. Medium confidence.

Tonight . MVFR improving to VFR this evening. VFR is expected overnight. Winds will remain west to northwest 5 to 10 knots. Medium confidence.

Sunday . VFR ceilings. West wind increasing around 10 knots with gusts near 20 knots. High confidence.

Outlook .

Sunday night-Tuesday . Mainly VFR, though cigs could occasionally be MVFR at times due to stratus. Winds remain mainly west to northwest and may gust 15-20 knots at times through Tuesday. Moderate confidence.

Wednesday . Mainly VFR with NW winds 5-10 knots.

MARINE. A Small Craft Advisory is now in effect on all waters. For the ocean waters, seas will run 6 to 9 ft through tonight. Seas should linger around 5 ft through the day Sunday, so the SCA was extended through Sunday afternoon. East-southeasterly winds could gust to 30 kt today. There is the potential for a couple of isolated gale force gusts, but not expecting them to be widespread or long lasting enough to warrant a Gale Warning. For the Delaware Bay, the SCA will expire at noon today as winds diminish. Sub-SCA conditions should continue through Sunday on the Bay, though westerly winds on Sunday could gust to 20 kt.

Outlook .

Sunday night . Winds and waves are likely to remain above advisory levels into the evening before diminishing overnight.

Monday-Wednesday . Winds and waves should remain mainly below advisory levels through this period though winds could occasionally gust to near or just over 20 knots at times.

TIDES/COASTAL FLOODING. High tide has now passed at all tide gauges, and water levels will continue to subside. Therefore, the coastal flood advisory has been cancelled for the remainder of the area.

PHI WATCHES/WARNINGS/ADVISORIES. PA . None. NJ . None. DE . None. MD . None. MARINE . Small Craft Advisory until 6 PM EST Sunday for ANZ450>455.



Synopsis . O'Hara Near Term . Iovino Short Term . O'Brien Long Term . Fitzsimmons/O'Brien Aviation . Iovino/O'Hara Marine . Haines/O'Brien/O'Hara Tides/Coastal Flooding . Haines


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
TPLM2 - Thomas Point, MD 10 mi39 min W 13 G 14 49°F 40°F1010.8 hPa (+0.0)45°F
CPVM2 11 mi57 min 50°F
APAM2 - 8575512 - Annapolis, MD 14 mi57 min 51°F 1009.2 hPa
CA2 - 8571892 - Cambridge, MD 23 mi57 min WNW 5.1 G 8.9 46°F 41°F1009.7 hPa
TCBM2 - 8573364 - Tolchester Beach, MD 23 mi57 min SSW 5.1 G 6 45°F 41°F1009.9 hPa
BSLM2 - Chesapeake Bay, MD 25 mi129 min WNW 4.1 1009 hPa
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 28 mi51 min WNW 12 G 14 49°F 1009.8 hPa
FSNM2 28 mi63 min W 14 G 19 1009.5 hPa
BLTM2 - 8574680 - Baltimore, MD 32 mi57 min NNW 7 G 9.9 50°F 39°F1009.4 hPa
SLIM2 - 8577330 - Solomons Island, MD 40 mi51 min NNW 9.9 G 13 52°F 42°F1009.3 hPa
WASD2 - 8594900 - Washington, DC 41 mi51 min NNW 5.1 G 9.9 50°F 40°F1010.9 hPa
BISM2 - 8571421 - Bishops Head, MD 47 mi57 min NW 6 G 7 50°F 42°F1009 hPa

Wind History for Cambridge, MD
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Bay Bridge Field, MD8 mi54 minWNW 710.00 miMostly Cloudy48°F46°F94%1009.8 hPa
Easton / Newman Field, MD11 mi54 minWSW 510.00 miMostly Cloudy52°F48°F88%1010.8 hPa
Annapolis, United States Naval Academy, MD14 mi1.7 hrsVar 410.00 miOvercast49°F45°F86%1009.9 hPa

Link to 5 minute data for KW29

Wind History from W29 (wind in knots)
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N8N9NE3W4W7W5W6W5W7
1 day agoNW3NE3CalmCalmCalmCalmCalmN3NW4NE4CalmCalmN3NE4N5NE5NE3E7E6E6E4N3E7E7
2 days agoE6CalmSE3CalmE3CalmCalmCalm--SW6SW5SE6Calm--CalmCalmCalmCalmNW4NE4CalmCalmN4NW3

Tide / Current Tables for Claiborne, Eastern Bay, Maryland
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Claiborne
Click for Map
Sat -- 03:57 AM EST     0.62 feet High Tide
Sat -- 07:16 AM EST     Sunrise
Sat -- 07:58 AM EST     Moonrise
Sat -- 10:09 AM EST     -0.42 feet Low Tide
Sat -- 04:57 PM EST     1.17 feet High Tide
Sat -- 05:18 PM EST     Sunset
Sat -- 06:06 PM EST     Moonset
Sat -- 11:56 PM EST     -0.04 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-00.10.40.60.60.50.30.1-0.2-0.3-0.4-0.4-0.20.20.50.91.11.21.10.90.70.40.20

Tide / Current Tables for Baltimore Harbor Approach, Maryland Current
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Baltimore Harbor Approach
Click for Map
Sat -- 03:15 AM EST     0.00 knots Slack
Sat -- 05:46 AM EST     0.57 knots Max Flood
Sat -- 07:17 AM EST     Sunrise
Sat -- 07:59 AM EST     Moonrise
Sat -- 08:29 AM EST     -0.00 knots Slack
Sat -- 11:18 AM EST     -0.61 knots Max Ebb
Sat -- 01:54 PM EST     0.00 knots Slack
Sat -- 05:17 PM EST     Sunset
Sat -- 05:33 PM EST     1.08 knots Max Flood
Sat -- 06:06 PM EST     Moonset
Sat -- 08:55 PM EST     -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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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 Philadelphia/Mount Holly, PA (15,3,4,5)
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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.