Saturday, July4, 2020
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Marine Weather and Tides
Baltimore Highlands, 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 5:44AMSunset 8:37PM Saturday July 4, 2020 10:46 PM EDT (02:46 UTC) Moonrise 7:29PMMoonset 4:01AM Illumination 100% Phase: Full Moon; Moon at 14 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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ANZ538 Patapsco River Including Baltimore Harbor- 1036 Pm Edt Sat Jul 4 2020
Rest of tonight..SW winds 5 kt. Waves less than 1 ft.
Sun..S winds around 5 kt. Waves 1 ft or less. A chance of showers and tstms.
Sun night..SW winds 5 kt. Waves less than 1 ft.
Mon..S winds 5 to 10 kt. Waves 1 ft or less. A chance of showers and tstms.
Mon night..S winds 5 to 10 kt. Waves 1 ft. A chance of showers and tstms.
Tue..S winds 5 to 10 kt. Waves 1 ft or less. A chance of showers.
Tue night..S winds 5 to 10 kt. Waves 1 ft.
Wed..S winds 5 to 10 kt. Waves 1 ft or less.
Thu..SE winds 5 to 10 kt. Waves 1 ft or less. A chance of showers and tstms. Winds and waves higher and visibilities lower in and near tstms.
ANZ500 1036 Pm Edt Sat Jul 4 2020
Synopsis for the tidal potomac and md portion of the chesapeake bay.. A weak front stalled near the area will weaken tonight into Sunday. High pressure over the atlantic will control the weather pattern for the early and middle portion of next week. Low pressure will pass by to the south during this time.


7 Day Forecast for Marine Location Near Baltimore Highlands, MD
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location: 39.26, -76.6     debug


Area Discussion for - Baltimore, MD/Washington
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FXUS61 KLWX 050118 AFDLWX

Area Forecast Discussion National Weather Service Baltimore MD/Washington DC 918 PM EDT Sat Jul 4 2020

SYNOPSIS. A weak backdoor boundary remains stalled over the region, and will dissipate overnight into Sunday. High pressure will build overhead at the surface and aloft for the early and middle portions of next week, bringing hot and humid conditions to the area. Daily chances for showers and thunderstorms remain however.

NEAR TERM /UNTIL 6 AM SUNDAY MORNING/. Even though there is plenty of instability, the 00Z IAD sounding tells the story as to why convection has struggled: poor mid level lapse rates and an abundance of mid level dry air. At 9PM, there's only one prominent thunderstorm left in Nelson County, along with a few small showers in southern PA and the Potomac Highlands. Some guidance continues to depict showers lasting well into the night, but don't know if a substantial trigger exists for much new development. Will maintain some low PoPs for a few more hours but will be removing thunder chances.

Guidance also indicates the potential for light fog, though am not sure how widespread it will be since rain coverage has been sparse, and some mid and high level clouds will likely be crossing through the night. Have kept patchy fog mention generally west of I-95. Lows in the upper 60s to mid 70s are on track.

SHORT TERM /6 AM SUNDAY MORNING THROUGH MONDAY NIGHT/. Upper level ridge will build towards the region Sunday and Monday. This, paired with southerly surface flow, will lead to continued hot and humid conditions across the region. Highs will remain in the mid 90s both days, with lows only into the low 70s for most, with upper 60s over the higher elevations.

Continued heat and humidity, paired with a weak pressure trough, bay/river breezes and the terrain circulation, could spark off showers and storms each day. Storms would be isolated to widely scattered in coverage each day though, as the ridge aloft will make it a little harder to really get convection going. Gusty winds and heavy rain will be possible with any storms that do develop.

LONG TERM /TUESDAY THROUGH SATURDAY/. Overall good agreement amongst guidance concerning the long term. Upper level ridging along most of the southern CONUS with the jet stream displaced along the US/Canada border persists throughout much of next week. High pressure centered over the Mid-Atlantic will keep conditions mainly dry through Wednesday. Overall conditions are expected to remain hot and humid with temperatures in the 90s and dew points in the 70s. Given the amount of heat and moisture, cannot fully rule out the chances for afternoon convection. There will be a lack of any significant forcing, thus expect any showers/thunderstorms to be widely scattered and brief at best.

Meanwhile, a weak cut-off low will meander over the southeastern CONUS before shifting offshore late Wednesday into Thursday. While the low is expected to remain mainly offshore, there is moderate spread on how close the low comes to the Potomac which could cause more widespread showers/thunderstorms to occur. Regardless, the influx of additional moisture from an easterly flow will keep convection potential elevated through the end of the week.

AVIATION /01Z SUNDAY THROUGH THURSDAY/. It looks like the threat of thunderstorms has ended for the night at the TAF sites, though there could be a brief shower or sprinkle near MRB. Main concern for the second half of the night is fog and/or low clouds. Guidance solutions are disparate, with consensus blend resulting in MVFR at MRB and CHO. Think some guidance is too saturated, especially since rain coverage was sparse today, and there will be mid/high level clouds crossing as well. Thus have not put any IFR in the TAFs, though an hour or two can't be ruled out at MRB/CHO (as well as MVFR at IAD). Would think restrictions would favor fog over low clouds as well.

Another chance for showers and storms Sunday and Monday across the forecast area, which could lead to restrictions at any of the terminals during the afternoon/evening. Generally VFR otherwise though.

Chances for lower CIG/VSBYs will remain present in regards to patchy early morning fog. Otherwise, mainly VFR conditions are expected Tuesday and Wednesday. While conditions are expected to remain mostly dry, chances for afternoon convection persist throughout much of next week.

MARINE. It appears the threat of thunderstorms has ended for the waters for tonight. Winds have turned southerly and could gust around 15 kt at times on the main channel of the Bay. Closer to shore, there may be some land breeze effects.

A southerly gradient wind should remain below SCA criteria most of the time Sunday through Wednesday. However, isolated to scattered thunderstorms are possible during the afternoon and evening hours each day, and locally gusty winds are possible in any thunderstorm that develops.

TIDES/COASTAL FLOODING. A light southerly flow will develop tonight into Sunday, and it will persist through early next week. This will cause water levels to be elevated. Minor flooding is possible at sensitive areas, beginning with the high tide cycle later tonight and continuing into early next week. Confidence is low because the flow will be light. Given trends so far this evening, do not have the confidence to hoist any advisories yet, though Straits Point and Annapolis will be close.

LWX WATCHES/WARNINGS/ADVISORIES. DC . None. MD . None. VA . None. WV . None. MARINE . None.

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


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
BLTM2 - 8574680 - Baltimore, MD 1 mi47 min WSW 1 G 2.9 83°F 80°F1012.9 hPa (+0.9)
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 5 mi47 min SW 4.1 G 4.1 82°F 1013.2 hPa (+1.0)
FSNM2 5 mi59 min SSW 4.1 G 5.1 84°F 1013.3 hPa
TCBM2 - 8573364 - Tolchester Beach, MD 19 mi47 min ESE 2.9 G 5.1 80°F 84°F1013.6 hPa (+1.0)
APAM2 - 8575512 - Annapolis, MD 20 mi47 min N 1.9 G 1.9 81°F 84°F1012.8 hPa (+0.7)
CPVM2 21 mi47 min 83°F 73°F
TPLM2 - Thomas Point, MD 26 mi47 min S 1.9 G 1.9 83°F 82°F1014.3 hPa (+0.8)72°F
BSLM2 - Chesapeake Bay, MD 34 mi137 min WSW 1 1012 hPa
WASD2 - 8594900 - Washington, DC 35 mi47 min S 1.9 G 2.9 83°F 85°F1013.5 hPa (+0.8)
CHCM2 - 8573927 - Chesapeake City, MD 46 mi47 min SE 2.9 G 4.1 77°F 83°F1013.7 hPa (+1.1)

Wind History for Baltimore, MD
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Baltimore, Baltimore-Washington International Airport, MD6 mi53 minS 38.00 miFair81°F68°F65%1013.1 hPa
Baltimore / Martin, MD11 mi53 minN 010.00 miClear82°F69°F66%1013.2 hPa
Fort Meade / Tipton, MD15 mi52 minN 02.50 miFair72°F71°F100%1014.2 hPa
Annapolis, United States Naval Academy, MD20 mi53 minN 06.00 miFair with Haze80°F72°F76%1013.4 hPa
Bay Bridge Field, MD24 mi52 minSE 47.00 miFair77°F75°F94%1013.5 hPa

Link to 5 minute data for KBWI

Wind History from BWI (wind in knots)
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Last 24hrN9N3W3NW3NW3CalmCalmCalmCalmN6E95E56SE6E7E7SE5E7SE6E6S3S3S3
1 day agoW3W3W5W4W4W4NW5NW4NW4NW6NW75NW7NW6NW75NW7NW7NW7W6W9W6W3Calm
2 days agoCalmCalmCalmNW4CalmCalmCalmCalmCalmNW4N7NW7NW95N85NW7NW7NW8N5NW6NW5W3SW3

Tide / Current Tables for Middle Branch, Baltimore Harbor, Maryland
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Middle Branch
Click for Map
Sat -- 12:10 AM EDT     0.20 feet Low Tide
Sat -- 05:00 AM EDT     Moonset
Sat -- 05:45 AM EDT     Sunrise
Sat -- 07:08 AM EDT     1.95 feet High Tide
Sat -- 02:38 PM EDT     0.39 feet Low Tide
Sat -- 07:13 PM EDT     1.04 feet High Tide
Sat -- 08:28 PM EDT     Moonrise
Sat -- 08:36 PM EDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.20.20.40.81.21.61.81.91.91.71.51.20.90.60.40.40.50.70.9110.90.60.4

Tide / Current Tables for Baltimore Harbor Approach, Maryland Current
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Baltimore Harbor Approach
Click for Map
Sat -- 12:59 AM EDT     0.00 knots Slack
Sat -- 04:51 AM EDT     1.33 knots Max Flood
Sat -- 05:00 AM EDT     Moonset
Sat -- 05:45 AM EDT     Sunrise
Sat -- 08:26 AM EDT     -0.00 knots Slack
Sat -- 11:45 AM EDT     -1.16 knots Max Ebb
Sat -- 03:33 PM EDT     0.00 knots Slack
Sat -- 05:50 PM EDT     0.49 knots Max Flood
Sat -- 08:17 PM EDT     -0.00 knots Slack
Sat -- 08:26 PM EDT     Moonrise
Sat -- 08:34 PM EDT     Sunset
Sat -- 11:14 PM EDT     -0.66 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.400.50.91.21.31.20.80.2-0.3-0.8-1.1-1.2-1-0.6-0.20.20.40.50.40.1-0.2-0.5-0.7

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 (22,6,7,8)
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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.