Friday, April3, 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 6:43AMSunset 7:31PM Friday April 3, 2020 1:48 PM EDT (17:48 UTC) Moonrise 1:17PMMoonset 3:13AM Illumination 81% Phase: Waxing Gibbous; Moon at 11 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- 139 Pm Edt Fri Apr 3 2020
.small craft advisory in effect through late tonight...
This afternoon..NW winds 15 kt with gusts to 30 kt. Waves 3 ft.
Tonight..N winds 10 to 15 kt. Gusts up to 25 kt until early morning. Waves 2 ft.
Sat..N winds 5 to 10 kt. Waves 1 ft.
Sat night..SE winds 5 kt. Waves flat.
Sun..S winds 5 kt. Waves less than 1 ft.
Sun night..SW winds 5 kt. Waves less than 1 ft.
Mon..SW winds 5 kt. Waves less than 1 ft.
Tue..SE winds 5 kt. Waves less than 1 ft. A chance of showers.
ANZ500 139 Pm Edt Fri Apr 3 2020
Synopsis for the tidal potomac and md portion of the chesapeake bay.. High pressure will build in from the ohio valley through through Sunday morning. A weak cold front will follow Sunday afternoon. The front will stall nearby Monday into Tuesday before a low pressure system approaches from the midwest Wednesday.


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 031329 AFDPHI

Area Forecast Discussion National Weather Service Mount Holly NJ 929 AM EDT Fri Apr 3 2020

SYNOPSIS. Low pressure south of the Canadian Maritimes will retrograde back towards the Mainland today before departing over the weekend. Meanwhile, high pressure over the Great Lakes and Ohio Valley slowly builds east, and will be over the Northeast and Mid-Atlantic over the weekend. This high moves offshore Sunday night, and a warm front lifts north through the region. High pressure returns on Monday, then moves offshore Tuesday. A series of weak low pressure systems will pass through the region next week until a stronger cold front passes through the region late in the week.

NEAR TERM /UNTIL 6 PM THIS EVENING/. The large offshore ocean storm will continue to retrograde south- southwestward. As of 9 AM it was only about 90 miles off the coast of Cape Cod. By late this afternoon, we are expecting the low to be about 300 miles due east of the central Jersey shore. This will lead to today being a considerably less pleasant day than yesterday. Widespread cloudiness has already pinwheeled southwest across most of the region and will remain in place through the day. We also expect light rain showers to pinwheel in as a trough on the back side of the low digs south over our region. The best chance for showers will be in the eastern half of the region, with activity gradually shifting southward through the day. Showers look like they will be mainly light and "spritzy", with the various high res models all a little different in their evolution. Rainfall totals mostly less than a tenth of an inch.

Another breezy day is expected, though it will probably not be quite as windy as yesterday. While the center of the low will be closer, it is also weakening and the gradients are starting to slowly relax. Still, gusts to 30 mph are likely in many areas, and a bit stronger at the coast. Highs are forecast to be mainly in the mid 50s as 850mb temperatures near 0C and the widespread clouds and showers will keep us a little cooler than average.

SHORT TERM /6 PM THIS EVENING THROUGH 6 AM SATURDAY/. Improving conditions are expected tonight as high pressure starts to build in from the west. The offshore low will continue shifting southward, but will begin to move in a more southeasterly direction as it says goodbye to the East Coast for good. Mostly cloudy conditions should linger through the night, but the shower risk will decrease. In addition, as the low moves away, the pressure gradient will weaken and winds will finally relax in earnest. Lows ranging from the upper 30s to mid 40s as cloud cover and the lighter but still steady breeze will help keep the lows a little above average.

LONG TERM /SATURDAY THROUGH THURSDAY/. Low pressure over the Western Atlantic, generally about 500 miles east of the Carolina coast, will continue to drift offshore on Saturday. Meanwhile, high pressure over the Ohio Valley builds east into western New York and Pennsylvania. Some strong shortwave energy will pass through the region as well, and although some sprinkles, perhaps a light rain shower, are possible, think it should be dry enough at the surface that will not include PoPs in the forecast. It will be cloudy, though, with near normal temperatures in the mid to upper 50s. Onshore flow will keep temperatures cooler along the coasts.

Low pressure continues to drift out to sea over the weekend, and high pressure will be over the area on Sunday, and departs late in the day. WAA begins, and temperatures warm back up into the upper 50s and lower 60s. Another warm front lifts north through the region Sunday night, and high pressure redevelops west of the area for the start of the new week. It will turn much warmer on Monday with highs in the mid to upper 60s throughout.

From there, a series of low pressure systems will begin to affect the area starting on Tuesday, and there will be at least a chance for showers through Thursday. A stronger area of low pressure passing through Canada should drag a stronger cold front through the region late Thursday.

AVIATION /13Z FRIDAY THROUGH TUESDAY/. The following discussion is for KPHL, KPNE, KTTN, KABE, KRDG, KILG, KMIV, KACY and surrounding areas.

Today . Mainly VFR conditions expected through this morning, with ceilings gradually lowering. This afternoon, development of MVFR ceilings is likely in most areas, though RDG and ABE may remain VFR. Scattered light rain showers possible especially east of PHL. Northwest winds around 15 kt with gusts up to 30 kt possible, slowly diminishing late this afternoon and this evening. Overall high confidence, though fluctuations between low end VFR and high end MVFR conditions are possible.

Tonight . Mainly MVFR with ceilings around 2000-3000 ft, but low end VFR may hold on near RDG and ABE. Winds becoming northerly early, then north-northeasterly late, with speeds decreasing to around 5 to 10 kt. High confidence.

Outlook .

Saturday . VFR. NE winds 5-10 kt, becoming LGT/VRB Saturday night. High confidence.

Sunday . VFR during the day, then a chance for MVFR with scattered showers Sunday night as a warm front lifts through the region. W-SW winds 5-10 kt. Moderate confidence.

Monday through Tuesday . Mainly VFR conditions expected. Light west to southwest winds, with localized sea breezes along the coasts. Moderate confidence.

MARINE. Today . A gale warning has been issued for the southern coastal waters and the lower Delaware Bay as gale force gusts are expected to continue at least through mid day near the mouth of the Delaware Bay. SCA conditions are expected elsewhere.

Tonight . On Delaware Bay, conditions should subside to sub-SCA levels early with winds gradually turning northerly and gusts diminishing to 20 kt or less. On the Atlantic coastal waters, SCA conditions will continue. Winds will shift to northerly then north- northeasterly at 15 to 20 kt with gusts to 30 kt. Seas building to 5 to 8 ft.

Outlook .

Saturday through Sunday night . A prolonged period of SCA conditions expected for the ocean waters. There will be wind gusts to 25 kt on Saturday, and then seas will remain elevated at 4-6 feet through Sunday. Sub-SCA conditions expected on DE Bay during this time.

Monday through Tuesday . Sub-SCA conditions expected on DE Bay and the Atlantic Coastal waters.

TIDES/COASTAL FLOODING. Low pressure over the western Atlantic Ocean will combine with increasing astronomical tides due to an approaching full moon to result in a period of coastal flooding during the times of high tide late tonight through Saturday morning.

Widespread minor tidal flooding is possible, with areas of moderate flooding across southern New Jersey and Delaware. Will go ahead and hoist a Coastal Flood Watch for Atlantic, Cape May, and Cumberland counties in southern New Jersey, and for Kent and Sussex counties in Delaware from 2am-10am Saturday.

For the northern New Jersey areas of Monmouth, Ocean, and southern Burlington counties, a Coastal Flood Advisory will likely be needed for minor coastal flooding, likewise for New Castle county, Delaware, and Salem county, New Jersey.

For the tidal Delaware River, at least one round of minor flooding is possible on Saturday, but confidence is a little lower owing to increased model variability and predominant northerly flow. For the eastern shores of Chesapeake Bay, confidence is also rather low. The north to northwest flow would suggests a reduced threat, but will need to watch lower portions of the bay closely to determine if sufficient water evacuation occurs between high tides to mitigate the threat of higher tidal levels in upper portions of the bay.

PHI WATCHES/WARNINGS/ADVISORIES. PA . None. NJ . Coastal Flood Watch from late tonight through Saturday morning for NJZ021>025. DE . Coastal Flood Watch from late tonight through Saturday morning for DEZ002>004. MD . None. MARINE . Small Craft Advisory until 7 PM EDT Saturday for ANZ450>452. Gale Warning until 4 PM EDT this afternoon for ANZ431-453>455. Small Craft Advisory until 4 PM EDT this afternoon for ANZ430.

Synopsis . MPS Near Term . Johnson/O'Brien Short Term . O'Brien Long Term . MPS Aviation . MPS/O'Brien Marine . Johnson/MPS/O'Brien Tides/Coastal Flooding .


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
TPLM2 - Thomas Point, MD 10 mi48 min WNW 22 G 25 56°F 51°F1009 hPa (-0.5)31°F
CPVM2 11 mi48 min 56°F
APAM2 - 8575512 - Annapolis, MD 14 mi48 min 57°F 1007.6 hPa (-0.7)
CA2 - 8571892 - Cambridge, MD 23 mi48 min NW 21 G 26 55°F 53°F1007.4 hPa (-0.4)
TCBM2 - 8573364 - Tolchester Beach, MD 23 mi48 min N 22 G 29 1008.9 hPa (+0.3)
44062 - Gooses Reef, MD 24 mi24 min NNW 16 G 18 55°F
BSLM2 - Chesapeake Bay, MD 25 mi138 min NNW 11 1008 hPa
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 28 mi48 min NNW 23 G 27 55°F 1007.8 hPa (-0.4)
FSNM2 28 mi60 min NNW 27 G 33 55°F 1007.5 hPa
BLTM2 - 8574680 - Baltimore, MD 32 mi48 min N 13 G 27 56°F 49°F1008 hPa (-0.3)
COVM2 - 8577018 - Cove Point LNG Pier, MD 34 mi156 min NW 25 G 31 1008.6 hPa
SLIM2 - 8577330 - Solomons Island, MD 40 mi48 min NW 13 G 20 58°F 53°F1007.5 hPa (-1.2)
WASD2 - 8594900 - Washington, DC 41 mi48 min NW 9.9 G 21 61°F 55°F1009 hPa (-1.1)
BISM2 - 8571421 - Bishops Head, MD 47 mi48 min NNW 19 G 27 58°F 51°F1007.3 hPa (-0.8)

Wind History for Cambridge, MD
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Bay Bridge Field, MD8 mi63 minNNW 12 G 2110.00 miMostly Cloudy57°F39°F51%1008.5 hPa
Easton / Newman Field, MD11 mi58 minNW 17 G 2310.00 miPartly Cloudy57°F32°F39%1009.1 hPa
Annapolis, United States Naval Academy, MD14 mi54 minNNW 13 G 2510.00 miA Few Clouds57°F33°F41%1008.2 hPa

Link to 5 minute data for KW29

Wind History from W29 (wind in knots)
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1 day agoNW6N7NW6N5--CalmW4NW5W5NW7N10
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Tide / Current Tables for Claiborne, Eastern Bay, Maryland
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Claiborne
Click for Map
Fri -- 12:13 AM EDT     1.02 feet High Tide
Fri -- 04:12 AM EDT     Moonset
Fri -- 06:26 AM EDT     0.17 feet Low Tide
Fri -- 06:45 AM EDT     Sunrise
Fri -- 12:49 PM EDT     1.42 feet High Tide
Fri -- 02:17 PM EDT     Moonrise
Fri -- 07:31 PM EDT     Sunset
Fri -- 08:02 PM EDT     0.32 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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110.80.60.40.30.20.20.30.60.91.21.41.41.31.210.70.50.40.30.40.60.8

Tide / Current Tables for Baltimore Harbor Approach, Maryland Current
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Baltimore Harbor Approach
Click for Map
Fri -- 02:13 AM EDT     0.41 knots Max Flood
Fri -- 04:13 AM EDT     Moonset
Fri -- 04:52 AM EDT     -0.00 knots Slack
Fri -- 06:46 AM EDT     Sunrise
Fri -- 07:49 AM EDT     -0.49 knots Max Ebb
Fri -- 10:29 AM EDT     0.00 knots Slack
Fri -- 02:09 PM EDT     0.85 knots Max Flood
Fri -- 02:17 PM EDT     Moonrise
Fri -- 05:33 PM EDT     -0.00 knots Slack
Fri -- 07:31 PM EDT     Sunset
Fri -- 08:50 PM EDT     -0.82 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.10.30.40.40.2-0-0.3-0.4-0.5-0.4-0.10.20.50.70.80.80.60.2-0.2-0.5-0.8-0.8-0.7-0.4

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.
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Wind Forecast for Philadelphia/Mount Holly, PA (13,3,4,5)
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Ground Weather Radar Station Dover AFB, DE
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Disclaimer:
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.