Thursday, October1, 2020
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Marine Weather and Tides
Riva, 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 7:01AMSunset 6:49PM Thursday October 1, 2020 6:47 PM EDT (22:47 UTC) Moonrise 6:08PMMoonset 5:36AM Illumination 100% Phase: Full Moon; Moon at 15 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- 436 Pm Edt Thu Oct 1 2020
.small craft advisory in effect through late tonight...
Rest of this afternoon..N winds 10 kt. Waves 1 ft. A chance of showers.
Tonight..N winds 5 to 10 kt with gusts to 20 kt. Waves 2 ft. Showers likely.
Fri..NW winds 5 to 10 kt. Waves 1 to 2 ft.
Fri night..NW winds 5 to 10 kt. Waves 1 ft.
Sat..NW winds 5 to 10 kt. Waves 1 ft.
Sat night..NE winds around 5 kt. Waves 1 ft or less.
Sun..SE winds 5 kt. Waves less than 1 ft. A chance of showers through the night.
Mon..N winds 5 to 10 kt. Waves 1 ft. A chance of showers.
ANZ500 436 Pm Edt Thu Oct 1 2020
Synopsis for the tidal potomac and md portion of the chesapeake bay.. A cold front will pass through tonight. Canadian high pressure will build overhead for Friday and Saturday. Low pressure and its associated cold front will approach the waters Sunday before passing through Sunday night into Monday. A small craft advisory may be required Friday night.


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 011903 AFDLWX

Area Forecast Discussion National Weather Service Baltimore MD/Washington DC 303 PM EDT Thu Oct 1 2020

SYNOPSIS. A cold front will slide across the region late this afternoon into tonight. Canadian high pressure will build overhead Friday through Saturday. Low pressure may impact the area late Sunday into Monday before high pressure returns for the middle of next week.

NEAR TERM /UNTIL 6 AM FRIDAY MORNING/. An upper level disturbance, dropping southeastward across the lower Great Lakes and eastern Ohio Valley, will bring a period of rain to the eastern half of our CWA late this afternoon through tonight. We should begin to see this rain taking shape along and just east of the Blue Ridge Mountains from near Loudoun County to Albemarle County in Virginia around 4 or 5 pm this afternoon. Most of this rain will spread east and north the remainder of this afternoon and throughout tonight. Rain amounts will be light. No thunder is expected when considering most of this rain will fall on the cool side of the cold front that will be passing through our CWA tonight. A re-inforcing cold front will pass through later tonight and help to clear cloud cover and rain out of our area. Highs this afternoon will be in the low to mid 70s. Lows tonight will be in the mid 40s to mid 50s.

SHORT TERM /6 AM FRIDAY MORNING THROUGH SATURDAY NIGHT/. During the day Friday, we will enter an area of subsidence as high pressure builds in from the northwest. A lingering shower in northeastern Maryland may still occur around daybreak Friday; otherwise, conditions will become and remain dry. Mostly sunny skies are forecast, along with highs in the mid- upper 60s. Skies will stay mostly clear tomorrow night as high pressure starts to work overhead. The pressure gradient of the building may weaken enough for sheltered valleys in the West Virginia panhandle to go calm. If the higher elevation valleys do go calm, some patchy frost can't be ruled out. Elsewhere, lows should be in the low to mid 40s, with temperatures holding near 50 in the urban centers and along the bay.

Saturday will feature similar conditions to Friday as high pressure moves overhead. Skies will be mostly sunny, winds will stay light, and highs will be in the mid 60s. With high pressure overhead and clear skies, patchy frost may be possible once again Saturday night in the mountain valleys to the west. Lows will run below normal for early October, with low to mid 40s common, and around 50 degrees in DC, Baltimore, and along the bay.

LONG TERM /SUNDAY THROUGH THURSDAY/. High pressure will shift offshore Sunday as a H5 trough deepens over the Plains. While the majority of Sunday appears to remain dry at this time, PoPs are likely to increase from west to east during the late afternoon/evening as the trough continues to swings eastward. As of now, the best chance for showers appears to be along and west of the Blue Ridge late Sunday afternoon/evening.

Low pressure will continue to move eastward through the region Monday, resulting in showery conditions throughout most of the day. However the low appears to be rather quick moving, thus should see slight improving conditions Monday afternoon, especially for areas west of I-95 as high pressure builds in from the west.

Thereafter, expansive high pressure will once again dominate the region through the middle of next week. A cold front may impact the region on Thursday in regards to additional showery activity. Temperatures overall appear to remain seasonable during the extended period.

AVIATION /19Z THURSDAY THROUGH TUESDAY/. VFR conditions the rest of this afternoon through Saturday. A period of light rain late this afternoon and this evening could lead to a reduction in conditions, mainly ceilings, to MVFR. This rain will push out of the area by daybreak Friday, giving way to dry conditions for Friday and Saturday.

VFR conditions are likely for the majority of the day on Sunday before an area of low pressure moves through the region late Sunday into Monday. As a result, CIG/VSBY restrictions are possible. VFR conditions are expected to return late Monday and remain through Wednesday.

MARINE. A Small Craft Advisory is in effect this evening through mid- morning Friday for the Tidal Potomac and central and southern portions of the Chesapeake Bay in our CWA responsibility. A northerly flow developing this evening and continuing overnight behind a reinforcing cold front will generate some channeling and gusty northerly winds. Sub- SCA winds are expected for late morning Friday through Saturday.

A cold front will approach Sunday and it will pass through the waters Monday as coastal low pressure develops offshore and tracks to the northeast. An SCA for northwest winds behind the boundary may be needed Monday into Monday night.

EQUIPMENT. The KLWX (Sterling, VA) WSR-88D outage, which began on September 20, 2020, will continue and remain out of service until on or about October 16, 2020.

On Saturday, technicians from the NWS Radar Operations Center (ROC), based in Norman, Oklahoma, determined that a primary component for turning the radar antenna, the bull-gear, needs replacement. This repair will require 12,000 to 15,000 pounds of equipment and a six-person team from the ROC to restore the radar. At this time, the team anticipates repairs being completed on or about October 16, 2020.

During the downtime, adjacent supporting NWS radars include: Dover DE (KDOX), Mt. Holly NJ (KDIX), Pittsburgh PA (KPBZ), Charleston WV (KRLX), Blacksburg VA (KFCX), and Wakefield VA (KAKQ).

For a radar mosaic loop for the region:

https:/radar.weather.gov/ridge/Conus/northeast.php

Further updates about the situation will be issued as information becomes available. Thank you for your understanding during this extended outage.

Point of Contact:

Christopher Strong email: Christopher.Strong@noaa.gov office: 703-996-2223

LWX WATCHES/WARNINGS/ADVISORIES. DC . None. MD . None. VA . None. WV . None. MARINE . Small Craft Advisory from 6 PM this evening to 9 AM EDT Friday for ANZ532>534-537-540>543.

SYNOPSIS . KLW NEAR TERM . KLW SHORT TERM . KLW LONG TERM . MSS AVIATION . MSS/KLW MARINE . MSS/KLW EQUIPMENT . KLW


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
APAM2 - 8575512 - Annapolis, MD 9 mi48 min N 2.9 G 4.1 72°F
BSLM2 - Chesapeake Bay, MD 9 mi138 min E 4.1 1012 hPa
TPLM2 - Thomas Point, MD 9 mi48 min NE 8.9 G 9.9 69°F 71°F1014 hPa (-0.0)53°F
CPVM2 13 mi48 min 70°F 53°F
WASD2 - 8594900 - Washington, DC 22 mi48 min N 6 G 13 70°F 69°F1013.6 hPa (+0.5)
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 23 mi48 min NNW 8 G 9.9 70°F 1013.2 hPa (-0.0)
FSNM2 23 mi48 min NNW 8.9 G 9.9 69°F 1013.1 hPa (-0.0)
44062 - Gooses Reef, MD 25 mi30 min NE 12 G 14 70°F 71°F
BLTM2 - 8574680 - Baltimore, MD 26 mi48 min N 8.9 G 12 69°F 73°F1013 hPa (-0.0)
TCBM2 - 8573364 - Tolchester Beach, MD 29 mi48 min N 8.9 G 9.9 69°F 71°F1013.6 hPa (-0.0)
CA2 - 8571892 - Cambridge, MD 36 mi48 min Calm G 1 74°F 71°F1012.8 hPa (-0.0)
COVM2 - 8577018 - Cove Point LNG Pier, MD 36 mi48 min SSE 7 G 7 1013.2 hPa (+0.0)
SLIM2 - 8577330 - Solomons Island, MD 40 mi48 min SE 8.9 G 9.9 70°F 72°F1012.4 hPa (+0.0)
NCDV2 46 mi48 min Calm G 1.9 73°F 72°F1011.5 hPa (-0.4)

Wind History for Washington, DC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Annapolis, United States Naval Academy, MD9 mi54 minNE 310.00 miOvercast69°F57°F66%1013.3 hPa
Camp Springs / Andrews Air Force Base, MD15 mi52 minN 610.00 miMostly Cloudy67°F58°F74%1013.8 hPa
Bay Bridge Field, MD15 mi53 minN 010.00 miOvercast68°F53°F60%1013.2 hPa
Fort Meade / Tipton, MD16 mi53 minN 010.00 miOvercast63°F59°F88%1014.6 hPa
College Park Airport, MD18 mi53 minNW 410.00 miOvercast67°F50°F57%1013.9 hPa
Baltimore, Baltimore-Washington International Airport, MD21 mi54 minNNW 410.00 miMostly Cloudy68°F52°F57%1013.1 hPa
Washington/Reagan National Airport, DC, VA23 mi56 minNNW 810.00 miOvercast69°F53°F57%1013.7 hPa

Link to 5 minute data for KNAK

Wind History from NAK (wind in knots)
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Last 24hrS4S4S5S5S5S43S33W6W5CalmCalmNW54W7NW7NW8NW7NW9NW6N8N5NE3
1 day agoS9
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Tide / Current Tables for Rhode River (County Wharf), Maryland
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Rhode River (County Wharf)
Click for Map
Thu -- 05:04 AM EDT     1.50 feet High Tide
Thu -- 06:35 AM EDT     Moonset
Thu -- 07:02 AM EDT     Sunrise
Thu -- 11:26 AM EDT     0.45 feet Low Tide
Thu -- 05:06 PM EDT     Full Moon
Thu -- 05:26 PM EDT     1.45 feet High Tide
Thu -- 06:47 PM EDT     Sunset
Thu -- 07:08 PM EDT     Moonrise
Thu -- 11:39 PM EDT     0.50 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.50.711.21.41.51.41.310.80.60.50.50.60.81.11.31.41.41.31.10.90.70.5

Tide / Current Tables for Baltimore Harbor Approach, Maryland Current
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Baltimore Harbor Approach
Click for Map
Thu -- 02:39 AM EDT     0.00 knots Slack
Thu -- 05:41 AM EDT     0.79 knots Max Flood
Thu -- 06:35 AM EDT     Moonset
Thu -- 07:01 AM EDT     Sunrise
Thu -- 08:41 AM EDT     -0.00 knots Slack
Thu -- 11:48 AM EDT     -0.84 knots Max Ebb
Thu -- 02:52 PM EDT     0.00 knots Slack
Thu -- 05:06 PM EDT     Full Moon
Thu -- 06:03 PM EDT     0.90 knots Max Flood
Thu -- 06:47 PM EDT     Sunset
Thu -- 07:07 PM EDT     Moonrise
Thu -- 09:14 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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-0.8-0.6-0.30.10.50.70.80.60.3-0.1-0.5-0.8-0.8-0.7-0.40.10.50.80.90.80.50.1-0.3-0.7

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
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.