Thursday, August13, 2020
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Marine Weather and Tides
Riviera Beach, 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 6:16AMSunset 8:05PM Thursday August 13, 2020 4:16 AM EDT (08:16 UTC) Moonrise 12:00AMMoonset 2:46PM Illumination 31% Phase: Waning Crescent; Moon at 24 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- 353 Am Edt Thu Aug 13 2020
Rest of the overnight..NE winds 5 kt. Waves flat. A chance of showers with a slight chance of tstms.
Today..E winds 5 kt. Waves less than 1 ft. A chance of showers and tstms.
Tonight..E winds 5 kt. Waves less than 1 ft. A chance of showers and tstms.
Fri..NE winds 5 to 10 kt. Waves 1 ft. Showers and tstms likely.
Fri night..NE winds 5 to 10 kt. Waves 1 ft. A chance of showers.
Sat..E winds 5 to 10 kt. Waves 1 ft. A chance of showers and tstms.
Sat night..E winds 10 kt. Waves 1 ft. A chance of showers and tstms.
Sun..E winds 5 to 10 kt. Waves 1 ft. A chance of tstms. A chance of showers.
Mon..NW winds around 5 kt. Waves 1 ft or less. A chance of showers and tstms. Winds and waves higher and visibilities lower in and near tstms.
ANZ500 353 Am Edt Thu Aug 13 2020
Synopsis for the tidal potomac and md portion of the chesapeake bay.. A front will stall over the middle atlantic through Thursday, then drift southward through early this weekend.


7 Day Forecast for Marine Location Near Riviera Beach, MD
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location: 39.16, -76.53     debug


Area Discussion for - Baltimore, MD/Washington
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FXUS61 KLWX 130809 AFDLWX

Area Forecast Discussion National Weather Service Baltimore MD/Washington DC 409 AM EDT Thu Aug 13 2020

SYNOPSIS. A front will stall over the Middle Atlantic today, then drift southward Friday into Saturday. The front will then lift back northward through the end of the weekend as low pressure lifts into the Ohio River Valley.

NEAR TERM /THROUGH TONIGHT/. Stalled front in the vicinity combined with a tropical air mass and passing shortwave energy promises to make the next few days interesting. For this morning, a fairly significant vort max and shortwave will move through shortly. This is already starting to cause storms to develop, and expect coverage to expand northward, maxing out during rush hour. Locally heavy rain is very possible and given the rain we had yesterday in some areas, a flash flood watch seemed prudent. Ran the watch through this evening as expect more storms to fire in the afternoon, but highest coverage likely occurs this morning with the shortwave. Exhaustion of CAPE and modest height rises/anticyclonic flow this afternoon likely keep coverage a bit reduced. Some sun will break through, but highs will only be in the 80s. By comparison, tonight looks like we will be between upper level features, so evening convection will diminish and do not expect a refiring overnight. Lows in the 60s to 70s.

SHORT TERM /FRIDAY THROUGH SATURDAY NIGHT/. Front will make some southward progress Friday night through Saturday night as upper low to the west strengthens/sharpens. This will result in better afternoon storm coverage Friday, and then better rain/storm coverage overall Saturday. As the atmosphere being tapped is not going to change, even if the immediate low level one does somewhat behind the front, expect the heavy rain threat to persist through Saturday night. With the continued clouds and storms, highs will continue to be in the 80s, with Saturday being the cooler day as the front drops further south. Lows will be in the 60s to 70s, not much change.

LONG TERM /SUNDAY THROUGH WEDNESDAY/. The aforementioned frontal boundary continues to lift northward on Sunday, with low pressure riding along it across the area into Sunday evening. This will again bring thunderstorms to the area. Heavy rainfall again will be possible with these. Temperatures will be well below average on Sunday, with highs struggling to reach 80 for most.

Beyond Sunday, looks like a brief lull in activity could occur early in the week. However, still a great deal of uncertainty there, as the upper-level pattern remains unsettled nearby. But Monday and Maybe Tuesday could see the area in zonal flow, with less coverage of showers/storms. Highs each day in the low to mid 80s.

By the middle of next week upper-level flow may once again buckle, allowing for more disturbed weather across the region. However, timing of that is still up in the air at this point. This time of year typically brings about weakly forced events, so can be a bit tough to nail down this far out. Continue to monitor latest forecasts for new info.

AVIATION /08Z THURSDAY THROUGH MONDAY/. Patchy low clouds and fog will be an issue each of the next three late night/early morning periods as plentiful low level moisture will make its formation easy, if we have clearing. That said, higher clouds may limit this threat at the terminals. Otherwise, main concern will be for heavy downpours with lightning to produce sub-VFR conditions and gusty winds. Best coverage will generally be afternoon hours, though today, a disturbance makes storms a bit more likely in the morning.

Sub-VFR conditions expected at times on Sunday, as low pressure moves along a lifting frontal boundary over the area.

VFR conditions generally expected by Monday, in the wake of the low, but some showers and storms remain possible in the afternoon, but with less coverage.

MARINE. Generally sub-SCA conditions expected on the waters through Saturday. Main concern each day will be thunderstorms, primarily during the afternoon hours, though some may develop during the mornings. Gusty winds and even a few waterspouts will be possible with stronger storms.

SCA conditions possible on Sunday in onshore flow. By Monday, flow shifts offshore, but could remain close to (but should stay just below) SCA criteria.

HYDROLOGY. Significant rain fell in scattered areas around the CWA yesterday. While not everyone saw heavy rain, most of the CWA had some rain, so antecedent conditions are growing increasingly wet. With some locally heavy showers and storms expected this morning, it seemed prudent to issue a Flash Flood Watch, even though confidence on really heavy concentrated storms is not quite as high given somewhat reduced CAPE. Storm coverage may actually decrease significantly this afternoon, but confidence on this is not yet high. That said, would not be surprised if the watch was to be dropped early.

LWX WATCHES/WARNINGS/ADVISORIES. DC . Flash Flood Watch through this evening for DCZ001. MD . Flash Flood Watch through this evening for MDZ013-014-016>018. Flash Flood Watch from 7 AM EDT this morning through this evening for MDZ003>006-011-501>508. VA . Flash Flood Watch through this evening for VAZ025-026-029- 036>040-050>057-501>504-507-508. Flash Flood Watch from 7 AM EDT this morning through this evening for VAZ027-028-030-031-505-506. WV . Flash Flood Watch from 7 AM EDT this morning through this evening for WVZ050>053-055-501>506. MARINE . None.

SYNOPSIS . RCM NEAR TERM . RCM SHORT TERM . RCM LONG TERM . CJL AVIATION . RCM/CJL MARINE . RCM/CJL HYDROLOGY . RCM


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FSNM2 4 mi46 min 76°F 1017.3 hPa
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 4 mi46 min 76°F 1017.3 hPa
BLTM2 - 8574680 - Baltimore, MD 8 mi46 min 76°F 85°F1016.9 hPa
APAM2 - 8575512 - Annapolis, MD 13 mi46 min 77°F 85°F1016.9 hPa
CPVM2 14 mi46 min 77°F 74°F
TCBM2 - 8573364 - Tolchester Beach, MD 16 mi46 min 74°F 85°F1017.6 hPa
TPLM2 - Thomas Point, MD 19 mi76 min ENE 7 G 8 77°F 83°F1018.3 hPa (+0.0)77°F
BSLM2 - Chesapeake Bay, MD 28 mi106 min NNE 1 1017 hPa
WASD2 - 8594900 - Washington, DC 33 mi46 min 76°F 84°F1017.5 hPa
44062 - Gooses Reef, MD 42 mi28 min 79°F 84°F
CHCM2 - 8573927 - Chesapeake City, MD 46 mi46 min 75°F 85°F1017.8 hPa
CA2 - 8571892 - Cambridge, MD 47 mi46 min 76°F 85°F1017 hPa

Wind History for Francis Scott Key Bridge, MD
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Baltimore, Baltimore-Washington International Airport, MD8 mi22 minN 010.00 miMostly Cloudy75°F72°F90%1017.3 hPa
Annapolis, United States Naval Academy, MD13 mi22 minE 410.00 miFair77°F75°F96%1017.2 hPa
Fort Meade / Tipton, MD14 mi21 minN 02.50 miFair72°F69°F94%1018.6 hPa
Bay Bridge Field, MD17 mi21 minN 010.00 miFair75°F75°F100%1017.3 hPa
College Park Airport, MD24 mi21 minN 010.00 miMostly Cloudy73°F71°F93%1017.3 hPa

Link to 5 minute data for KBWI

Wind History from BWI (wind in knots)
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Last 24hrCalmW4W5W4NW4NW33SE34SW5N6N4S13
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CalmCalmS6N4SE4NW3CalmCalmCalmCalm
1 day agoCalmSE3S3S3Calm55S6S664S7S6S5S5S5S5CalmS4S4S4S3SW3Calm
2 days agoSW4SW3CalmW33NW3SW3CalmCalm43SE6SE9SE8S7S6S4S4CalmS3CalmCalmCalmSE3

Tide / Current Tables for Stony Creek, Patapsco River, Maryland
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Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.


Tide / Current Tables for Baltimore Harbor Approach, Maryland Current
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Baltimore Harbor Approach
Click for Map
Thu -- 12:54 AM EDT     Moonrise
Thu -- 01:08 AM EDT     0.90 knots Max Flood
Thu -- 04:49 AM EDT     -0.00 knots Slack
Thu -- 06:17 AM EDT     Sunrise
Thu -- 08:02 AM EDT     -0.70 knots Max Ebb
Thu -- 11:51 AM EDT     0.00 knots Slack
Thu -- 01:56 PM EDT     0.25 knots Max Flood
Thu -- 03:45 PM EDT     Moonset
Thu -- 04:05 PM EDT     -0.00 knots Slack
Thu -- 07:20 PM EDT     -0.50 knots Max Ebb
Thu -- 08:02 PM EDT     Sunset
Thu -- 10:04 PM EDT     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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0.80.90.80.60.3-0.1-0.4-0.6-0.7-0.6-0.5-0.200.20.30.20-0.2-0.4-0.5-0.5-0.3-00.3

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 (4,6,7,8)
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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.