Tuesday, October27, 2020
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Marine Weather and Tides
Annapolis, MD

Version 3.4
NOTICE
8/26/2020 The 7 day forecast is taking about 5 seconds to load but it will eventually load. NOAA is still working on it.
8/18/2020 NOAA continues to have trouble. Wind guest will occasionally be left off graphs. I am working with NOAA to resolve the issue.
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 7:27AMSunset 6:12PM Tuesday October 27, 2020 10:57 AM EDT (14:57 UTC) Moonrise 3:49PMMoonset 2:30AM Illumination 82% 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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ANZ532 Chesapeake Bay From Sandy Point To North Beach- 1040 Am Edt Tue Oct 27 2020
Rest of today..N winds 5 to 10 kt. Waves 1 ft.
Tonight..NE winds 5 kt. Waves flat.
Wed..NE winds 5 kt. Waves less than 1 ft.
Wed night..SE winds 5 kt. Waves less than 1 ft. Rain.
Thu..SE winds 5 to 10 kt. Waves 1 to 2 ft. Rain.
Thu night..SE winds 5 to 10 kt...becoming nw 10 to 15 kt after midnight. Gusts up to 20 kt. Waves 1 to 2 ft. Rain.
Fri..N winds 15 to 20 kt. Waves 2 to 3 ft. Rain in the morning, then a chance of rain through the night.
Sat..SE winds 5 to 10 kt. Waves 1 to 2 ft.
ANZ500 1040 Am Edt Tue Oct 27 2020
Synopsis for the tidal potomac and md portion of the chesapeake bay.. A front will stall over our region today and remain in the area through Friday.the remnants of zeta will impact the waters late Wednesday night through Thursday night and another low pressure may pass through the waters Friday. A small craft advisory will be needed for the waters Thursday and Friday with gale warnings possible Thursday into Friday. Refer to the national hurricane center for the latest information regarding the track of zeta.


7 Day Forecast for Marine Location Near Annapolis, MD
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location: 38.97, -76.49     debug


Area Discussion for - Baltimore, MD/Washington
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FXUS61 KLWX 271428 AFDLWX

Area Forecast Discussion National Weather Service Baltimore MD/Washington DC 1028 AM EDT Tue Oct 27 2020

SYNOPSIS. A cold front will stall out nearby through Friday morning. The remnants of Zeta and another low pressure will track along the boundary, impacting our area Wednesday night through Friday morning. High pressure will return for later Friday through Saturday before a cold front passes through Sunday. Follow the National Hurricane Center for the latest information on Zeta.

NEAR TERM /THROUGH TONIGHT/. A weak cold front will continue to drop southeast into our area. The boundary will stall out over central Virginia later this afternoon. A nearly zonal flow aloft will continue during this time and a weak upper-level disturbance in the zonal flow may trigger a couple showers, especially across the Allegheny and Potomac Highlands. However, much of the time will be dry since forcing will be weak and moisture will be limited. A bkn stratocu deck along with some high and mid-level clouds will allow for mostly cloudy skies this afternoon, and temperatures will be near climo, with max temps in the lower to middle 60s for most locations, and perhaps upper 60s to near 70 in our extreme southwestern zones in central Virginia.

The boundary will remain nearly stationary tonight, and another upper-level disturbance will pass through in the zonal flow aloft. This may trigger a few showers, but any precipitation will be light since forcing will be limited. There may be some more fog overnight, but confidence for widespread fog is low since there will be plenty of clouds around as well. Best chance for fog appears to be across central Virginia where dewpoints till be a tad higher.

SHORT TERM /WEDNESDAY THROUGH THURSDAY NIGHT/. The boundary will remain near central Virginia Wednesday and it will separate near seasonable conditions for most of the area from warmer conditions to the south. Max temps will be in the upper 50s to lower 60s across northern MD, lower to middle 60s across most other locations, but perhaps into the lower and middle 70s for central Virginia. A stray shower cannot be completely ruled out, but most areas will remain dry for Wednesday.

Zeta will track through the Gulf Coast States Wednesday night while a potent upper-level low associated with the southern stream of the jet moves trough the southern Plains. Plenty of moisture from the Gulf of Mexico will advect well north and east ahead of these systems and the forcing along the boundary over our area will begin to strengthen in response to lower pressures from increased divergence aloft. This will cause rain to develop and spread northeastward into our area, especially overnight.

The remnants of Zeta will track along the boundary, passing through our area Thursday into Thursday night and the upper- level low will be fast on its heels moving into the area later Thursday night. Coastal low pressure will likely develop along the Mid-Atlantic coast as a result. The anomalous moisture along with forcing from the remnants of Zeta, as well as the upper- level low and developing coastal low appears that it will cause widespread rain across the area during this time. While it appears that the best frontogenetical forcing (along the 850mb boundary) may set up to our north and the best instability and tropical moisture (from the remnants of Zeta) may set up to our south, there is still the potential for locally heavy rainfall, especially if the remnants of Zeta hold together and track over the area. See the National Hurricane Center for the latest information regarding Zeta.

Most likely rainfall amounts for most areas appear to be around 1 to 3 inches, with locally higher amounts possible. This seems to match well with a majority of the 00z guidance as well as the latest 00z EPS and GEFS. Flooding is possible, but given the recent relatively dry conditions along with the fact that rainfall should be spread out, it appears that the threat will be more isolated vs widespread.

LONG TERM /FRIDAY THROUGH MONDAY/. A frontal system with multiple lows associated with it will exit our region on Friday. Rain will be likely Friday morning and into the early afternoon with periods of moderate rain possible. The main collection of lows should be over the far eastern half of our region by Friday afternoon with an upper level low dropping down into our region from the midwest. The upper level low will lead to some additional rainfall but rain should be lighter in nature. Rain start to taper off late Friday afternoon and move out of our area by Friday evening. Depending on how much rainfall that falls on our region Thursday into Friday morning, there will be the potential for isolated flooding. As the low shifts to our east, the strong pressure gradient on the west side of the system will likely lead to gusty winds of 20 to 25 knots out of the north.

Daytime highs on Friday should be cooler in the 50s as winds become northerly and skies remain overcast. As the front and upper level low exits our region to our east, winds will become northwesterly with clearing skies. A much cooler air mass will move into our region late Friday and into Saturday. Saturday morning lows will be chilly in the 30s with widespread freezing temps possible along and west of the Blue Ridge Mountains. Frost Advisories and freeze warnings will likely be needed for our counties who haven't already experience freezing temps.

Canadian high pressure will build over our region on Saturday. Cooler and drier conditions will become situated over our region with highs running in the upper 40s to lower 50s on Saturday. The high pressure will shift eastward out of our area on Sunday with a weak cold front moving through our region late Sunday into Monday morning. The main forcing associated with the front will likely remain to our north along the PA/NY border and will combine with a westerly flow to starve the front of moisture. A few showers especially along the Allegany front will be possible. High pressure will build back over our region Monday through the middle parts of next week.

AVIATION /15Z TUESDAY THROUGH SATURDAY/. A stratocu deck will continue this afternoon and MVFR cigs are possible, especially across KCHO.

More low clouds are possible tonight into Wednesday morning. The remnants of Zeta along with another low will approach Wednesday night before moving into the area later Thursday. Widespread rain is expected to develop Wednesday night and continue through Thursday night. IFR conditions are likely for much of this time.

Light to moderate rain associated with cold front will affect all regions on Friday lead to subVFR conditions. A strong gusty northwesterly flow will form on Friday with gusts up to 25 knots. The northerly winds will continue into this weekend but will weakened considerably. VFR conditions expected this weekend but fog can't be ruled out Saturday morning.

MARINE. A boundary will remain near the waters through Wednesday night. The gradient will be weak so winds should remain below SCA criteria for most of the time. The remnants of Zeta will pass through the area later Thursday and low pressure will develop Thursday night along the Mid-Atlantic Coast. A Small Craft Advisory will be needed during this time and a Gale Warning may also be needed.

A cold front will move through our marine waters on Friday. Small Craft Advisories are expected due to a strong northerly flow with gale warnings possible. The gusty winds should taper off over the weekend with subSCA conditions expected.

TIDES/COASTAL FLOODING. Elevated water levels will continue through midday, but with light winds the most likely scenario is for water levels to reach caution stages for sensitive areas.

More widespread coastal flooding is possible later Thursday into Friday as the remnants of Zeta pass through and another low pressure develops along the Mid-Atlantic Coast.

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

SYNOPSIS . BJL NEAR TERM . BJL/KLW SHORT TERM . BJL LONG TERM . JMG AVIATION . KLW/JMG MARINE . KLW/JMG TIDES/COASTAL FLOODING . KLW


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
APAM2 - 8575512 - Annapolis, MD 1 mi57 min NNW 2.9 G 6 59°F 65°F1022.8 hPa (+1.3)
CPVM2 6 mi57 min 60°F 53°F
TPLM2 - Thomas Point, MD 6 mi57 min N 9.9 G 11 59°F 64°F1024.1 hPa (+1.3)53°F
BSLM2 - Chesapeake Bay, MD 17 mi147 min N 1 1022 hPa
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 17 mi57 min N 8 G 8.9 59°F 1023.2 hPa (+1.1)
FSNM2 17 mi57 min N 8 G 8.9 58°F 1022.8 hPa (+1.0)
BLTM2 - 8574680 - Baltimore, MD 21 mi57 min NNE 7 G 8.9 58°F 67°F1022.9 hPa (+1.2)
TCBM2 - 8573364 - Tolchester Beach, MD 21 mi57 min NNE 8.9 G 12 59°F 63°F1023.5 hPa (+1.3)
44062 - Gooses Reef, MD 29 mi57 min N 14 G 16 61°F 65°F
WASD2 - 8594900 - Washington, DC 29 mi57 min Calm G 4.1 61°F 64°F1023.6 hPa (+1.4)
CA2 - 8571892 - Cambridge, MD 35 mi57 min N 8.9 G 12 61°F 64°F1023.2 hPa (+1.8)
COVM2 - 8577018 - Cove Point LNG Pier, MD 40 mi57 min N 16 G 19 61°F 1023.6 hPa (+1.6)
SLIM2 - 8577330 - Solomons Island, MD 45 mi57 min N 6 G 8 60°F 66°F1023 hPa (+1.6)

Wind History for Francis Scott Key Bridge NE Tower, MD
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Annapolis, United States Naval Academy, MD1 mi63 minN 410.00 miOvercast60°F55°F86%1023.4 hPa
Bay Bridge Field, MD8 mi62 minN 610.00 miOvercast59°F53°F82%1023.4 hPa
Fort Meade / Tipton, MD17 mi62 minN 010.00 miOvercast55°F53°F94%1024 hPa
Baltimore, Baltimore-Washington International Airport, MD18 mi63 minN 310.00 miOvercast59°F51°F75%1023.1 hPa
Camp Springs / Andrews Air Force Base, MD22 mi61 minNNE 510.00 miOvercast58°F55°F90%1024 hPa
College Park Airport, MD23 mi62 minN 010.00 miOvercast58°F53°F85%1023.4 hPa

Link to 5 minute data for KNAK

Wind History from NAK (wind in knots)
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Last 24hrNW6CalmNW5N5N3NW5CalmNW3NE3E3CalmCalmCalmCalmCalmCalmCalmW3CalmCalmCalmN4N6N4
1 day agoNE7NE5NE4NE5NE4NE6NE7N66NE7NE5N5N5N6N5N5NW7NW8N8N8N4NW7NW5NW8
2 days agoN4N4N5NW7NW7NW8NW8NW8N5N7N11
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Tide / Current Tables for Annapolis, Maryland (2)
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Annapolis
Click for Map
Tue -- 02:56 AM EDT     1.22 feet High Tide
Tue -- 03:30 AM EDT     Moonset
Tue -- 07:28 AM EDT     Sunrise
Tue -- 09:33 AM EDT     0.33 feet Low Tide
Tue -- 03:16 PM EDT     1.07 feet High Tide
Tue -- 04:48 PM EDT     Moonrise
Tue -- 06:10 PM EDT     Sunset
Tue -- 09:29 PM EDT     0.34 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.811.21.21.210.90.60.50.30.30.40.60.811.110.90.80.60.40.40.40.5

Tide / Current Tables for Baltimore Harbor Approach, Maryland Current
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Baltimore Harbor Approach
Click for Map
Tue -- 02:49 AM EDT     0.70 knots Max Flood
Tue -- 03:30 AM EDT     Moonset
Tue -- 05:48 AM EDT     -0.00 knots Slack
Tue -- 07:28 AM EDT     Sunrise
Tue -- 09:04 AM EDT     -0.83 knots Max Ebb
Tue -- 12:16 PM EDT     0.00 knots Slack
Tue -- 03:28 PM EDT     0.84 knots Max Flood
Tue -- 04:48 PM EDT     Moonrise
Tue -- 06:09 PM EDT     Sunset
Tue -- 06:43 PM EDT     -0.00 knots Slack
Tue -- 09:42 PM EDT     -0.72 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.10.40.60.70.60.3-0.1-0.4-0.7-0.8-0.7-0.5-0.10.30.60.80.80.60.3-0.1-0.5-0.7-0.7-0.6

Weather Map
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GEOS Local Image of    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
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.