Friday, October30, 2020
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Marine Weather and Tides
Point of Rocks, 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 7:34AMSunset 6:11PM Friday October 30, 2020 12:44 PM EDT (16:44 UTC) Moonrise 5:05PMMoonset 5:29AM Illumination 99% Phase: Waxing Gibbous; 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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ANZ535 Tidal Potomac From Key Bridge To Indian Head- 1040 Am Edt Fri Oct 30 2020
.small craft advisory in effect through this evening...
Rest of today..N winds 10 to 15 kt with gusts to 25 kt. Waves 1 ft. A chance of showers.
Tonight..N winds 5 to 10 kt with gusts to 20 kt. Waves 1 ft.
Sat..E winds 5 kt. Waves less than 1 ft.
Sat night..S winds around 5 kt. Waves 1 ft.
Sun..SW winds 5 to 10 kt with gusts to 20 kt. Waves 1 ft. A chance of showers.
Sun night..W winds 10 kt with gusts to 25 kt. Waves 1 ft.
Mon..W winds 10 to 15 kt. Waves 1 ft.
Tue..SW winds 5 to 10 kt. Waves 1 ft or less.
ANZ500 1040 Am Edt Fri Oct 30 2020
Synopsis for the tidal potomac and md portion of the chesapeake bay.. Low pressure will exit the region to the east later this morning. High pressure will build in its wake through Saturday night, then a cold front will follow by late Sunday. Small craft advisories and gale warnings will likely be needed Sunday into Monday.


7 Day Forecast for Marine Location Near Point of Rocks, MD
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location: 39.28, -77.53     debug


Area Discussion for - Baltimore, MD/Washington
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FXUS61 KLWX 301340 AFDLWX

Area Forecast Discussion National Weather Service Baltimore MD/Washington DC 940 AM EDT Fri Oct 30 2020

SYNOPSIS. Low pressure will continue to exit our area this morning as high pressure builds in through Saturday evening. A strong cold front will move through our region late Sunday through Monday; bringing windy conditions, the chance for showers, and colder than normal temperatures. High pressure continues over our region for the majority of next week.

NEAR TERM /THROUGH TONIGHT/. The bulk of the shower activity has ended across the CWA this morning. However a few lingering showers currently persist over northeastern MD but are expected to diminish as the low continues to move offshore. While the idea of a few additional scattered showers redeveloping this afternoon cannot be fully ruled out, overall expect drying conditions to continue throughout the remainder of the day as high pressure over the Ohio Valley continues to build into our area. Gusty northerly winds will continue through this afternoon but are expected to relax as we head into the evening hours. Cooler than normal temperatures are expected today with highs rising into the low to mid 50s.

As the high moves overhead by tonight, overnight lows will drop down into the upper 20s to mid 30s which has required us to issue freeze warnings and frost advisories for our counties who still have a growing season.

SHORT TERM /SATURDAY THROUGH SUNDAY NIGHT/. *PREVIOUS DISCUSSION* High pressure will remain positioned over our region through Saturday evening. Mostly clear skies along with continue light variable winds will lead to afternoon highs in the upper 40s to lower 50s. The high pressure will start of lift out of our region to the northeast Saturday evening. Behind the high pressure, winds will become southerly leading to the formation of a light return flow.

A closed off upper level low is forecast to drop down into the northern MD and PA areas on Sunday. A strong cold front associated with this low is expected to pass through our region during the later parts of the evening on Sunday and into Monday. The general trend of models over the past few days has been to increase the chances for precipitation with the best chance for rain focused along the MD/PA border where the best forcing will exist. Ahead of the frontal passage, winds will continue out of the south which will allow daytime temperatures to rise up into the upper 50s to lower 60s. The cold front is forecast to have a strong pressure gradient field which will lead to the threat for widespread strong and gusty winds especially over our higher elevations and over our marine areas. The strongest winds should occur during the early morning periods on Monday when our region will be positioned between the strong surface low to our northeast and a strong high pressure approaching from the southwest. Behind the frontal passage, a west to northwesterly flow will lead to some upslope induced rain and snow showers along and west of the Allegany front. Wind Advisories may be needed especially over our higher elevations Sunday into Monday. Behind the frontal passage, a much cooler air mass will move into our region with Sunday night lows forecast to be in the 20s and 30s.

LONG TERM /MONDAY THROUGH THURSDAY/. Gradient winds will be strong on Monday as low pressure strengthens to our northeast, providing a windy and chilly start to the work week. Humidity will also be low, and if it wasn't for the rains we got yesterday, there could be a fire weather concern. Winds could approach advisory criteria on Monday, which might cause minor damage, mainly to trees.

Temps Monday will be well below Sunday, and in fact stand a good chance of being the coldest so far this season, with temps potentially staying in the 40s all day long. This could lead to another widespread freeze potential, with likely the coldest night of the season thus far Monday night. Temps in most suburbs could reach the 20s, especially if the wind slackens late at night.

High pressure passing to our south should allow for a lighter, more westerly wind on Tuesday, shifting southwesterly on Wednesday and Thursday, which will provide a dry mid-week with warming temperatures.

AVIATION /13Z FRIDAY THROUGH TUESDAY/. Light showers are moving through our terminals this morning with periods of moderate rain. Ceilings should continue to be the most consistent aviation restriction over the next five hours with all terminals reporting MVFR to IFR conditions. Visibility remains the hardest to predict for our terminals as it depends on whether heavier rain moves through the terminals. Generally light rain has only been causing visiblities to drop down into the 5 to 6 mile range. The light mist and heavier rain seems to cause the most visibility restrictions at our terminals this morning. I expect rain to start tapering off over the CHO terminal over the next few hours with the back edge of the rain moving out of the DC metro terminals by 10Z. The MTN and BWI terminals will continue to see periods of heavier rain through about 12Z and then start to see the rain taper off shortly after daybreak. Once the rain moves out of our region, the main taf restrictions will be the gusty winds out of the north with 18 to 22 knot gust possible throughout today.

Skies will clear over all of our terminals by this afternoon and mainly VFR conditions expect through this weekend. The gusty winds will weakened and taper off Saturday morning with a light and variable flow expected through early Sunday. A strong cold front will bring strong, gusty winds to all our terminals late Sunday afternoon and into Monday.

Main aviation concern Monday will be the after the front crosses the region. Winds could gust to 50 mph. Lighter winds and continued VFR Tuesday.

MARINE. Showers are moving through our marine areas and will continue through this morning. The threat of rain should taper off by this afternoon with the main threat for our marine zone being the continued strong winds. We expect gale level winds to occur later this morning and into this afternoon for the majority of the Chesapeake Bay zones with Small Craft Advisory conditions expected through Saturday morning.

A strong cold front will bring strong and gusty winds to our marine zones Sunday into Monday. This system will likely produce widespread gale level winds for all of our marine waters and Gale Warnings are likely Sunday afternoon into Monday at this time.

Strong gusty winds are the main concern Monday after a powerful cold front blasts across the region. Gales look very possible as low pressure strengthens to our northeast. Lighter winds by Tuesday.

TIDES/COASTAL FLOODING. Falling water levels are expected today as the remnants of Zeta move away. Anomalies may spike by Sunday as southwesterly flow redevelops ahead of the next cold front, with another risk of minor flooding.

LWX WATCHES/WARNINGS/ADVISORIES. DC . None. MD . Frost Advisory from 3 AM to 9 AM EDT Saturday for MDZ011-503- 504-506. Freeze Warning from 3 AM to 9 AM EDT Saturday for MDZ004>006- 505-507-508. VA . Frost Advisory from 3 AM to 9 AM EDT Saturday for VAZ025-026- 029>031-038>040-050>053-501-502-506>508. Freeze Warning from 3 AM to 9 AM EDT Saturday for VAZ505. WV . Freeze Warning from 3 AM to 9 AM EDT Saturday for WVZ053. MARINE . Small Craft Advisory from 2 PM this afternoon to 10 AM EDT Saturday for ANZ532>534-537-540>543. Gale Warning until 2 PM EDT this afternoon for ANZ532>534-537- 540>543. Small Craft Advisory until 10 AM EDT Saturday for ANZ530-531- 538-539. Small Craft Advisory until 11 PM EDT this evening for ANZ535- 536.

SYNOPSIS . MSS/JMG NEAR TERM . MSS SHORT TERM . JMG LONG TERM . RCM AVIATION . RCM/JMG MARINE . RCM/JMG TIDES/COASTAL FLOODING .


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
WASD2 - 8594900 - Washington, DC 39 mi56 min N 8.9 G 14 53°F 64°F1014.2 hPa
BLTM2 - 8574680 - Baltimore, MD 50 mi56 min NNE 15 G 19 49°F 67°F1013.3 hPa
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 53 mi56 min NNW 15 G 18 49°F 1013.3 hPa

Wind History for Washington, DC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Frederick Municipal Airport, MD13 mi57 minN 810.00 miOvercast48°F42°F82%1015.2 hPa
Leesburg / Godfrey, VA14 mi49 minN 11 G 1910.00 miOvercast43°F35°F76%1015.6 hPa
Gaithersburg - Montgomery County Airport, MD21 mi48 minVar 410.00 miOvercast49°F41°F74%1015.8 hPa
Washington/Dulles International Airport, DC, VA23 mi52 minNNW 14 G 2210.00 miOvercast50°F41°F71%1014.8 hPa

Link to 5 minute data for KFDK

Wind History from FDK (wind in knots)
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Last 24hr5NE12N13N14
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NE5NE5N7N6N7N7NE9NE3N5N6N6N8N7N7N7NE8NE8N8
1 day agoS6SW6--CalmSW5NW3N7N3N5N6N3CalmCalmN4N4N5NE7NE5NE455555
2 days agoCalmCalmCalmSW4S4S7S3CalmCalmNE4N4N3CalmN3CalmCalmCalmCalmSE3CalmCalm--SW7S6

Tide / Current Tables for Chain Bridge, D.C.
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Chain Bridge
Click for Map
Fri -- 02:59 AM EDT     0.20 feet Low Tide
Fri -- 06:26 AM EDT     Moonset
Fri -- 07:34 AM EDT     Sunrise
Fri -- 08:42 AM EDT     2.95 feet High Tide
Fri -- 03:06 PM EDT     0.20 feet Low Tide
Fri -- 06:02 PM EDT     Moonrise
Fri -- 06:09 PM EDT     Sunset
Fri -- 08:59 PM EDT     3.17 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.40.80.40.20.41.11.82.42.92.92.621.30.80.40.20.411.82.533.22.92.4

Tide / Current Tables for Chain Bridge, one mile below, D.C.
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Chain Bridge
Click for Map
Fri -- 02:54 AM EDT     0.20 feet Low Tide
Fri -- 06:26 AM EDT     Moonset
Fri -- 07:34 AM EDT     Sunrise
Fri -- 08:37 AM EDT     2.95 feet High Tide
Fri -- 03:01 PM EDT     0.20 feet Low Tide
Fri -- 06:02 PM EDT     Moonrise
Fri -- 06:09 PM EDT     Sunset
Fri -- 08:54 PM EDT     3.17 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.30.80.40.20.51.11.92.52.92.92.51.91.30.80.40.20.41.11.92.633.22.92.3

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 Sterling, VA
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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.