Wednesday, April1, 2020
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Marine Weather and Tides
Riva, 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 7:31PM Wednesday April 1, 2020 4:40 AM EDT (08:40 UTC) Moonrise 11:09AMMoonset 1:32AM Illumination 58% Phase: Waxing Gibbous; Moon at 8 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- 405 Am Edt Wed Apr 1 2020
.small craft advisory in effect until noon edt today...
.small craft advisory in effect from Thursday morning through Thursday afternoon...
Rest of the overnight..NE winds 15 kt with gusts to 20 kt. Waves 3 ft. A chance of showers.
Today..N winds 10 to 15 kt with gusts to 20 kt. Waves 2 to 3 ft.
Tonight..NW winds 10 to 15 kt. Waves 1 to 2 ft.
Thu..NW winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft.
Thu night..NW winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft.
Fri..N winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft.
Fri night..N winds 5 to 10 kt. Waves 1 to 2 ft.
Sat..SE winds 5 to 10 kt. Waves 1 ft or less.
Sun..SW winds 5 to 10 kt. Waves 1 ft.
ANZ500 405 Am Edt Wed Apr 1 2020
Synopsis for the tidal potomac and md portion of the chesapeake bay.. Low pressure will exit the carolina coastline tonight and move out to sea Wednesday while strengthening. High pressure will slowly build in from the midwest through the end of the week. Small craft advisories may be needed late Wednesday night through Friday.


7 Day Forecast for Marine Location Near Riva, MD
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location: 38.89, -76.6     debug


Area Discussion for - Baltimore, MD/Washington
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FXUS61 KLWX 010810 AFDLWX

Area Forecast Discussion National Weather Service Baltimore MD/Washington DC 410 AM EDT Wed Apr 1 2020

SYNOPSIS. Low pressure will meander over the western Atlantic through Thursday. High pressure will move in from the Midwest through the weekend. A couple of fronts may approach early next week.

NEAR TERM /THROUGH THURSDAY/. Latest surface analysis shows strengthening low pressure heading east off the Outer Banks. High pressure stretches from the Mississippi Valley north through the Great Lakes toward Hudson Bay. Aloft, a closed low is consolidating over the northeastern US, with a ridge building across the central Plains.

The two main players, high to the northwest and low to the south, will continue to play a role in our weather through the near and short term. Today, the low will continue to strengthen as it heads east into the Atlantic while high pressure slowly builds in. Rain showers will dwindle as drier air builds south, but upper level forcing associated with the upper low may spark a few showers in the higher terrain through the day into this evening before ending. The highest ridges may still see some light snow, but additional accumulations from this point will be less than an inch and overall, snow will end this morning in those few spots where it is falling. Some breaks for sun are likely later today, but overall, clouds will dominate again today, so highs will again be mostly in the 50s.

Tonight high pressure will become more dominant as the upper low heads east a bit, with some clearing sikes, but the northwest flow will keep the air moving. Thus, uncertainty exists regarding any potential for widespread frost. Most likely areas to have winds light enough for frost advisory conditions are the Shenandoah Valley, but further east it is possible as well. For now have included patchy frost in the forecast and will let day shift re- evaluate potential for a frost advisory. As suggested, lows tonight will be mostly in the 30s.

The low heading east this morning will loop back to the northwest on Thursday. For us, this just means we will see the wind increase, with gusts of 20-30 mph likely in the afternoon. However, drier air should mean we have plenty of sunshine, and the northwest flow should have a downslope effect. Thus, highs expected to warm a bit from today, with low 60s possible.

SHORT TERM /THURSDAY NIGHT THROUGH FRIDAY NIGHT/. High pressure will domiante the end of the work week but the low off the coast will do a loop just southeast of New England. This will keep us in its influence, which could bring some additional clouds back to the area while also keeping a noticeably northwest wind in place. However, other than that, it should be fairly tranquil. Lows mostly in the mid 30s to near 40s Thursday night with highs in the low 60s Friday. Lows creep up a bit Friday night, with upper 30s to low 40s in most areas.

LONG TERM /SATURDAY THROUGH TUESDAY/. Low pressure over the western Atlantic will continue moving farther away this weekend as high pressure builds overhead from the Midwest. A weakening cold front will likely approach Sunday night but with not a lot of forcing, precip chances appear very low.

General height rises are expected early next week as high pressure builds over the Southeast U.S. However, a trough embedded in the upper flow and associated surface frontal system may approach early next week, perhaps resulting in showers in a large scale warm air advection-type setup.

AVIATION /08Z WEDNESDAY THROUGH SUNDAY/. Conditoins generally improve through the day as drier air builds south while low pressure heads out to sea. May have some intervals of MVFR, but VFR should come to dominate by this afternoon. Clouds will persist until this evening, when they clear out. VFR conditions will prevail tonight through Friday night, though a gusty northwest wind is expected Thursday and Friday with low pressure looping off the coast.

VFR this weekend.

MARINE. Winds likely slowly decline today as low pressure moves away, so SCA's gradually drop away through the day. Light winds much of tonight, but as low pressure off the coast streghthens and turns back toward the coast while high pressure builds in to the west, SCA conditions likely start redeveloping, with widespread SCA once again by Thursday afternoon. Winds may diminish somewhat Thursday night but may re-invigorate with daylight on Friday as the low lingers off the coast.

Light flow is expected this weekend with high pressure overhead.

TIDES/COASTAL FLOODING. Flow will become more northerly today and more northwesterly by tonight resulting in decreasing water levels. Before then, water piled up due to onshore flow is expected to result in minor inundation, particularly for shoreline adjacent to the lower tidal Potomac River. Near moderate flooding is even possible for Saint Mary's County this morning.

LWX WATCHES/WARNINGS/ADVISORIES. DC . None. MD . Coastal Flood Advisory until noon EDT today for MDZ016. Coastal Flood Advisory until 11 AM EDT this morning for MDZ017. VA . Coastal Flood Advisory until noon EDT today for VAZ057. WV . None. MARINE . Small Craft Advisory until noon EDT today for ANZ531-532-539- 540. Small Craft Advisory from 6 AM to 6 PM EDT Thursday for ANZ530>532-538>540-542. Small Craft Advisory until 3 PM EDT this afternoon for ANZ533- 541-542. Small Craft Advisory until 7 PM EDT this evening for ANZ534- 537-543. Small Craft Advisory from 3 AM to 6 PM EDT Thursday for ANZ533- 534-537-541-543. Small Craft Advisory from noon to 6 PM EDT Thursday for ANZ535- 536. Small Craft Advisory until 6 AM EDT early this morning for ANZ536.

SYNOPSIS . RCM/DHOF NEAR TERM . 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
APAM2 - 8575512 - Annapolis, MD 9 mi70 min 43°F 1008 hPa
BSLM2 - Chesapeake Bay, MD 9 mi130 min NE 4.1 1008 hPa
TPLM2 - Thomas Point, MD 9 mi40 min NNE 19 G 21 43°F 51°F1008.6 hPa (-1.8)34°F
CPVM2 13 mi70 min 43°F
WASD2 - 8594900 - Washington, DC 22 mi70 min N 4.1 G 8 43°F 56°F1008.6 hPa
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 23 mi70 min ENE 9.9 G 11 43°F 1008.7 hPa
FSNM2 23 mi70 min NE 13 G 16 42°F 1008.5 hPa
44062 - Gooses Reef, MD 25 mi52 min NE 16 G 19 44°F
BLTM2 - 8574680 - Baltimore, MD 26 mi70 min NE 8.9 G 11 42°F 52°F1008.5 hPa
TCBM2 - 8573364 - Tolchester Beach, MD 29 mi142 min NE 4.1 G 8 42°F 52°F1009.4 hPa
CA2 - 8571892 - Cambridge, MD 36 mi70 min NE 14 G 17 44°F 54°F1007.1 hPa
COVM2 - 8577018 - Cove Point LNG Pier, MD 36 mi70 min NNE 17 G 21 1007.6 hPa
SLIM2 - 8577330 - Solomons Island, MD 40 mi70 min NE 9.9 G 17 43°F 53°F1007 hPa
NCDV2 46 mi70 min NNE 4.1 G 8.9 43°F 56°F1006.8 hPa

Wind History for Washington, DC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Annapolis, United States Naval Academy, MD9 mi46 minNE 910.00 miOvercast43°F34°F71%1008.5 hPa
Camp Springs / Andrews Air Force Base, MD15 mi1.7 hrsN 010.00 miA Few Clouds40°F36°F86%1008.5 hPa
Bay Bridge Field, MD15 mi55 minNE 7 G 1510.00 miOvercast41°F35°F81%1008.5 hPa
Fort Meade / Tipton, MD16 mi55 minENE 410.00 miOvercast41°F33°F76%1009.5 hPa
College Park Airport, MD18 mi55 minN 010.00 miOvercast40°F33°F77%1008.5 hPa
Baltimore, Baltimore-Washington International Airport, MD21 mi46 minNNE 810.00 miOvercast42°F34°F73%1008.6 hPa
Washington/Reagan National Airport, DC, VA23 mi48 minNNE 1010.00 miOvercast43°F36°F76%1008.6 hPa

Link to 5 minute data for KNAK

Wind History from NAK (wind in knots)
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Last 24hrCalmN3N3N5N5N7E7NE6E7E11E13E12E12E11
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1 day agoSE4SE4SE3S3S44SE10SE11SE10SE15SE13SE12E5N14
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2 days agoNE5NE3N3E3N4CalmCalmCalmE9S8S7SE4SE8SE8E3N4N105NE3NE3N4CalmN4NE6

Tide / Current Tables for Rhode River (County Wharf), Maryland
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Rhode River (County Wharf)
Click for Map
Wed -- 02:32 AM EDT     Moonset
Wed -- 04:22 AM EDT     0.19 feet Low Tide
Wed -- 06:21 AM EDT     First Quarter
Wed -- 06:50 AM EDT     Sunrise
Wed -- 11:11 AM EDT     1.29 feet High Tide
Wed -- 12:09 PM EDT     Moonrise
Wed -- 06:35 PM EDT     0.32 feet Low Tide
Wed -- 07:30 PM EDT     Sunset
Wed -- 11:46 PM EDT     0.86 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.80.60.40.30.20.20.30.50.811.21.31.31.10.90.70.60.40.30.30.40.60.70.8

Tide / Current Tables for Baltimore Harbor Approach, Maryland Current
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Baltimore Harbor Approach
Click for Map
Wed -- 12:19 AM EDT     0.28 knots Max Flood
Wed -- 02:31 AM EDT     Moonset
Wed -- 02:42 AM EDT     -0.00 knots Slack
Wed -- 05:38 AM EDT     -0.39 knots Max Ebb
Wed -- 06:21 AM EDT     First Quarter
Wed -- 06:49 AM EDT     Sunrise
Wed -- 08:12 AM EDT     0.00 knots Slack
Wed -- 12:08 PM EDT     Moonrise
Wed -- 12:09 PM EDT     0.84 knots Max Flood
Wed -- 03:44 PM EDT     -0.00 knots Slack
Wed -- 07:07 PM EDT     -0.76 knots Max Ebb
Wed -- 07:29 PM EDT     Sunset
Wed -- 10:59 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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0.30.30.1-0.1-0.2-0.4-0.4-0.3-0.10.20.50.70.80.80.60.3-0.1-0.4-0.7-0.8-0.7-0.5-0.30

Weather Map
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wmap_A
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
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.