Tuesday, March31, 2020
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Marine Weather and Tides
Havre de Grace, 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 6:48AMSunset 7:29PM Tuesday March 31, 2020 11:31 AM EDT (15:31 UTC) Moonrise 10:11AMMoonset 12:34AM Illumination 51% Phase: First Quarter Moon; Moon at 7 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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ANZ530 Chesapeake Bay North Of Pooles Island- 1038 Am Edt Tue Mar 31 2020
Rest of today..E winds 5 to 10 kt. Waves 1 ft. A chance of rain.
Tonight..NE winds 5 to 10 kt. Waves 1 ft. A chance of rain.
Wed..N winds 5 to 10 kt. Waves 1 ft.
Wed night..NW winds 5 to 10 kt. Waves 1 ft.
Thu..NW winds 10 to 15 kt with gusts to 25 kt. Waves 2 ft.
Thu night..NW winds 10 to 15 kt with gusts to 20 kt. Waves 1 to 2 ft.
Fri..N winds 10 to 15 kt...becoming E around 5 kt. Waves 1 ft.
Sat..S winds around 5 kt. Waves 1 ft.
ANZ500 1038 Am 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 Havre de Grace city, MD
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location: 39.54, -76.09     debug


Area Discussion for - Baltimore, MD/Washington
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FXUS61 KLWX 311405 AFDLWX

Area Forecast Discussion National Weather Service Baltimore MD/Washington DC 1005 AM EDT Tue Mar 31 2020

SYNOPSIS. 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. 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/. High pressure is located well to the north in Canada this morning, with a lobe extending toward the Mid Atlantic. A backdoor boundary is near northeast Maryland, while an inverted trough extends northward along the Appalachians from low pressure over Alabama. The low will progress across the deep south today ahead of an upper level trough.

Some light radar echoes are nearing the Baltimore metro as the backdoor boundary seeps to the southwest. Meanwhile rain to the southwest ahead of the low will slowly advance to the northeast, though it will take some time for the atmosphere to saturate. Measurable rain will hold off until at least mid-afternoon for most. A narrow corridor near the Potomac river may end up between both moisture sources until this evening, if not through the bulk of the event. Will evaluate PoPs as new guidance arrives. Low clouds have filled in across the north and high clouds are fairly dense across the south, so there probably won't be much sun to be seen today. Considered lowering high temperatures, but given the earlier overcast and higher starting point to temperatures, we aren't too far off from expected highs in the 50s, so minimal adjustments will likely be needed.

Tonight, the backdoor front will cross the region as it gets entrained in the circulation of the stronger low passing to the south. Meanwhile, some modest warm advection and jet dynamics associated with the low to the south will also move into the region. Thus, rain and drizzle is likely in most of the region, though the heaviest precip is likely in central and western VA. Amounts will be light overall, however, with totals unlikely to exceed a half inch anywhere in the region. There is just enough cold air available for a light dusting at the higher elevations, but generally an inch or less, so no winter weather advisories are necessary. Lows tonight will be in the 30s to near 40s.

Dry northeasterly flow from high pressure to the north will start to allow precip to end from northeast to southwest late tonight into Wednesday morning as the low heads out to sea, so much of the region will be dry for the bulk of the day. Lingering upper level energy combined with another weak front dropping southward from the north may bring a few more showers late in the day Wednesday into Wednesday night, especially near and west of I-81. Highs Wednesday will be similar to Tuesday, with 50s common.

SHORT TERM /WEDNESDAY NIGHT THROUGH THURSDAY NIGHT/. Low pressure heads away allowing high pressure to build in Wednesday night through Thursday night. Clearing skies should allow temps to drop into the 30s Wednesday night, but sunshine Thursday should let temps rebound to near 60. Dry and mostly clear Thursday night with temps again mostly in the 30s to low 40s.

LONG TERM /FRIDAY THROUGH MONDAY/. Generally split zonal flow aloft is expected during the long term period. A surface ridge axis will move slowly from the Midwest across the Mid-Atlantic Friday and Saturday, then move offshore Sunday. A cold front will likely follow Sunday night into Monday, but guidance continues to trend slower and weaker with this feature.

The next appreciable chance of rain may not come until a bit more amplified upper-level trough and associated surface frontal system approach during the early to middle portion of next week.

AVIATION /14Z TUESDAY THROUGH SATURDAY/. VFR to start, but conditions deteriorate late today into tonight as low pressure approaches from the south and a backdoor cold front drops in from the northeast. Possible MVFR cigs could arrive at BWI/MTN faster than progged with the backdoor front, though less certain if they would make it to IAD/DCA. IFR likely tonight at most terminals with low clouds and light rain/drizzle, though some chance MTN/BWI stay MVFR. As the low heads out to sea Wednesday and drier air behind the backdoor front becomes dominant, conditions should improve, and remain VFR Wednesday night through Thursday night.

VFR conditions are expected Friday into Saturday with light northwesterly flow as high pressure builds overhead.

MARINE. SCA conditions likely to develop at least on part of the waters tonight into Wednesday as a low pressure passes to the south. 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. Winds should diminish as high pressure builds Thursday night.

Dry weather with light northwesterly flow is expected Friday into Saturday under building high pressure.

TIDES/COASTAL FLOODING. The tide forecast is riddled with 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 at least minor inundation is most likely for the Wednesday morning/midday high tide cycle.

LWX WATCHES/WARNINGS/ADVISORIES. DC . None. MD . None. VA . None. WV . None. MARINE . Small Craft Advisory from 4 AM to 1 PM EDT Wednesday for ANZ533-541-542. Small Craft Advisory from 7 PM this evening to 4 PM EDT Wednesday for ANZ534-537-543.

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


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
CHCM2 - 8573927 - Chesapeake City, MD 15 mi44 min ESE 7 G 12 46°F 51°F1016.2 hPa
TCBM2 - 8573364 - Tolchester Beach, MD 24 mi50 min NE 4.1 G 6 50°F 53°F1015.8 hPa
DELD1 - 8551762 - Delaware City, DE 27 mi44 min ESE 15 G 17 45°F 55°F1016.3 hPa
RDYD1 - 8551910 - Reedy Point, DE 27 mi44 min 45°F 51°F1015.8 hPa
BLTM2 - 8574680 - Baltimore, MD 32 mi44 min E 2.9 G 5.1 50°F 52°F1014.7 hPa
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 32 mi50 min NE 5.1 G 5.1 50°F 1015.3 hPa
FSNM2 32 mi62 min NE 4.1 G 8 49°F 1014.8 hPa
MRCP1 - 8540433 - Marcus Hook, PA 40 mi44 min 44°F 52°F1016.5 hPa
CPVM2 41 mi44 min 50°F
SJSN4 - 8537121 - Ship John Shoal, NJ 41 mi44 min E 12 G 16 45°F 1016.6 hPa
APAM2 - 8575512 - Annapolis, MD 44 mi50 min 51°F 1014.7 hPa
TPLM2 - Thomas Point, MD 48 mi32 min N 8.9 G 9.9 49°F 52°F1015.7 hPa (-1.2)39°F

Wind History for Chesapeake City, MD
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Phillips Army Air Field / Aberdeen, MD6 mi94 minN 010.00 miOvercast49°F40°F73%1016.6 hPa
Baltimore / Martin, MD22 mi34 minN 010.00 miOvercast52°F41°F67%1015.6 hPa

Link to 5 minute data for KAPG

Wind History from APG (wind in knots)
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Last 24hrS10SW8SW7SW11S10SW4NW10N7N6N4N7NE6N5N8N5N4N5N3N3CalmN5NE4CalmCalm
1 day agoE3CalmE8E6CalmW4SE5NE4NE5N5NE4E4NE4CalmCalmCalmN3NE5CalmSW3CalmCalmSW7SW7
2 days agoE6E8E9E8E5E7E6NE9NE7N6N4NE3CalmN6CalmN5NE9NE5NE4E3N3NE3NE5E5

Tide / Current Tables for Havre de Grace, Susquehanna River, Maryland
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Havre de Grace
Click for Map
Tue -- 01:34 AM EDT     Moonset
Tue -- 03:20 AM EDT     1.73 feet High Tide
Tue -- 06:49 AM EDT     Sunrise
Tue -- 09:15 AM EDT     0.35 feet Low Tide
Tue -- 11:11 AM EDT     Moonrise
Tue -- 03:16 PM EDT     2.58 feet High Tide
Tue -- 07:28 PM EDT     Sunset
Tue -- 10:41 PM EDT     0.47 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.91.31.61.71.71.51.20.80.50.40.40.81.31.92.32.62.52.21.81.410.70.50.5

Tide / Current Tables for Chesapeake and Delaware Canal, Maryland/Delaware Current
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Chesapeake and Delaware Canal
Click for Map
Tue -- 12:29 AM EDT     1.59 knots Max Flood
Tue -- 01:33 AM EDT     Moonset
Tue -- 02:32 AM EDT     -0.00 knots Slack
Tue -- 06:05 AM EDT     -2.11 knots Max Ebb
Tue -- 06:48 AM EDT     Sunrise
Tue -- 09:28 AM EDT     0.08 knots Slack
Tue -- 11:10 AM EDT     Moonrise
Tue -- 01:21 PM EDT     2.03 knots Max Flood
Tue -- 04:19 PM EDT     -0.08 knots Slack
Tue -- 06:54 PM EDT     -1.40 knots Max Ebb
Tue -- 07:26 PM EDT     Sunset
Tue -- 09:11 PM EDT     0.02 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.61.51.1-1-1.7-2-2.1-2-1.6-0.90.91.41.8221.50.7-0.9-1.3-1.4-1.2-0.50.91.2

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



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Wind Forecast for Baltimore, MD/Washington (11,2,3,4)
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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.