Monday, January18, 2021
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Marine Weather and Tides
Bryans Road, 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 7:22AMSunset 5:16PM Monday January 18, 2021 9:16 PM EST (02:16 UTC) Moonrise 10:49AMMoonset 10:58PM Illumination 31% Phase: Waxing Crescent; Moon at 6 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- 644 Pm Est Mon Jan 18 2021
.small craft advisory in effect until 8 pm est this evening...
Tonight..W winds 5 to 10 kt. Gusts up to 20 kt early this evening. Waves 1 ft.
Tue..SW winds 5 to 10 kt. Waves 1 ft.
Tue night..W winds 5 kt. Waves less than 1 ft.
Wed..NW winds 10 to 15 kt with gusts to 30 kt. Waves 1 ft. Scattered flurries.
Wed night..NW winds 5 to 10 kt...becoming S after midnight. Waves 1 ft.
Thu..SW winds 5 to 10 kt with gusts to 20 kt. Waves 1 ft.
Thu night..W winds 5 kt. Gusts up to 20 kt in the evening. Waves 1 ft.
Fri..NW winds 5 to 10 kt. Waves 1 ft.
Sat..NW winds 5 to 10 kt. Waves 1 ft.
ANZ500 644 Pm Est Mon Jan 18 2021
Synopsis for the tidal potomac and md portion of the chesapeake bay.. In the wake of the passage of upper level system, gusty winds will be widespread across the area waterways through this evening. High pressure builds to the south of our region through the early parts of this week. Small craft advisories likely Wednesday into Thursday, and possible again on Friday. There will also be potential gales on Wednesday.


7 Day Forecast for Marine Location Near Bryans Road, MD
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location: 38.62, -77.1     debug


Area Discussion for - Baltimore, MD/Washington
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FXUS61 KLWX 190151 AFDLWX

Area Forecast Discussion National Weather Service Baltimore MD/Washington DC 851 PM EST Mon Jan 18 2021

SYNOPSIS. High pressure will build south of the region this afternoon into Tuesday while low pressure remains over the eastern Great Lakes through mid week. A cold front will cross the area Thursday night. High pressure will build toward the region toward the end of the week and into the weekend.

NEAR TERM /THROUGH TUESDAY/.

The upper level shortwave is slowly moving east of our region this evening. Winds are slowly tapering off as the pressure gradient weakens. Skies continue to slowly clear this evening as dry air is slowly advecting into our region. I expect scattered cloud cover by tomorrow morning for most areas east of the Allegheny front.

..Previous Discussion.

The core of a modest upper trough has exited the region, although some residual trailing perturbations in the flow remain an impetus toward scattered snow flurries. The post-trough passage air mass is relatively dry at the low- levels which has generally led to evaporation of any snowflakes aloft into either virga or scattered flurries. These low-topped towers should wane by sundown given the loss of diurnal heating. Temperatures today have remained seasonable for mid-January standards, generally in the low/mid 40s, with 20s and 30s in the mountains. Any residual brisk west to northwesterly wind gusts should subside after dark. Until then, wind gusts around 15 to 25 mph remain possible.

While much of the region clears out, the exception will be along and west of the Allegheny Front where scattered snow showers remain in the forecast. Accumulations are likely to amount to a dusting up to 1 inch. Otherwise, a chilly night will be in store for mountain locations with lows well into the 20s, with mid 20s to near freezing elsewhere.

SHORT TERM /TUESDAY NIGHT THROUGH WEDNESDAY NIGHT/. A high latitude blocking pattern is in place with a ridge set up over Greenland while lower heights are in control over a large chunk of eastern Canada into the Great Lakes. This will maintain a train of shortwaves which are forecast to track from the midwestern U.S. into the Mid-Atlantic/northeastern U.S. One such wave is set to arrive Tuesday night bringing another round of widespread snow showers to the Allegheny Front region. 2 to 4 inches are possible through Wednesday, locally higher in a few spots. For areas from I-81 eastward, it will be a milder day given a shift to southwesterly flow. High temperatures could approach 50 degrees in central Virginia given enough sunshine. Skies will be comprised by a mixed bag of clouds and sun, so some spots may stay relatively cooler than others.

On Wednesday/Inauguration Day morning, a sharpening shortwave tracks across northern Pennsylvania, eventually exiting off the New Jersey coast. While some scattered flurries could churn out of these height falls, there is a lot of dry air to work around per model soundings. Any activity should wind down by the late morning hours with increasingly blustery northwesterly winds occurring throughout the day. A deep, well-mixed boundary layer could bring some of the 30 to 35 knot plus winds down to the surface. Thus, expect wind gusts reaching the 30 to 40 mph range at times which will lower wind chill temperatures into the mid/upper 20s. Winds should diminish by later in the evening as gradients decrease. By the overnight hours, lows will dip into the low/mid 20s in most areas, with chillier weather across the mountains. Wind chills are likely to reach the single digits over the higher peaks.

LONG TERM /THURSDAY THROUGH MONDAY/. Overall, the long term period will feature an extended stretch of quiet weather conditions. We'll have northwesterly flow aloft on both Thursday and Friday as multiple moisture starved shortwaves pass to our north. A cold front will move on through Friday Night, leading to cooler temperatures and blustery conditions on Saturday. Highs on Saturday should top out in the 30s and lower 40s, compared to the 40s on preceding days. The uptick in northwesterly flow behind the cold front Friday Night into Saturday may be enough to spark the development of a few snow showers along the Allegheny Front, but elsewhere conditions should stay dry. Any snow shower activity should come to an end Saturday afternoon as high pressure builds in from the west. Dry conditions will continue on Sunday as the high builds overhead. Highs on Sunday will again be mainly in the 40s.

AVIATION /02Z TUESDAY THROUGH SATURDAY/. VFR conditions are likely throughout the week across all terminals. The main issue for aviation this afternoon is the gusty west to northwesterly winds, generally 15 to 20 knots up through 6 PM. On Wednesday, blustery conditions are expected with northwesterly gusts possibly 25 to 35 knots at some terminals.

MARINE. Gusty winds across the marine waters will maintain small craft conditions into early Tuesday morning. The exception is the upper/middle Potomac which should see a gradual reduction in such winds by the early evening. Blustery winds on Wednesday will ensure Small Craft Advisory conditions, but also the possibility of gale-force wind gusts.

Gusts may approach Small Craft Advisory criteria on Thursday and Friday.

LWX WATCHES/WARNINGS/ADVISORIES. DC . None. MD . None. VA . None. WV . None. MARINE . Small Craft Advisory until 6 AM EST Tuesday for ANZ530>534- 537>543.

SYNOPSIS . BRO NEAR TERM . BRO/JMG SHORT TERM . BRO LONG TERM . KJP AVIATION . BRO/KJP/JMG MARINE . BRO/KJP


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
WASD2 - 8594900 - Washington, DC 18 mi46 min W 6 G 12 40°F 40°F1017.7 hPa
NCDV2 21 mi46 min W 1 G 2.9 39°F 42°F1017.2 hPa
BSLM2 - Chesapeake Bay, MD 24 mi46 min NW 6 39°F 1016 hPa20°F
44062 - Gooses Reef, MD 37 mi22 min NW 9.7 G 12 40°F 41°F
SLIM2 - 8577330 - Solomons Island, MD 40 mi46 min W 7 G 9.9 40°F 43°F1017.3 hPa
TPLM2 - Thomas Point, MD 40 mi16 min W 11 G 12 39°F 42°F1018.2 hPa (+3.1)22°F
APAM2 - 8575512 - Annapolis, MD 41 mi46 min W 7 G 9.9 38°F 42°F1016.5 hPa
PPTM2 - 8578240 - Piney Point, MD 45 mi46 min W 7 G 8.9
CPVM2 46 mi46 min 39°F 22°F

Wind History for Washington, DC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Fort Belvoir, VA9 mi20 minW 610.00 miFair38°F19°F46%1018.3 hPa
Quantico Marine Corps Airfield - Turner Field, VA13 mi20 minW 310.00 miFair38°F19°F46%1018.9 hPa
Washington/Reagan National Airport, DC, VA17 mi24 minW 710.00 miMostly Cloudy40°F20°F45%1017.9 hPa
Camp Springs / Andrews Air Force Base, MD19 mi20 minW 1010.00 miOvercast39°F20°F46%1017.8 hPa
Manassas, Manassas Regional Airport/Harry P. Davis Field, VA23 mi20 minW 410.00 miFair34°F20°F56%1019 hPa
Stafford, Stafford Regional Airport, VA24 mi21 minN 010.00 miMostly Cloudy38°F7°F27%1020 hPa

Link to 5 minute data for KDAA

Wind History from DAA (wind in knots)
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Last 24hrCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmW8W11
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1 day agoW4CalmW4CalmS4SW4SW5SW5SW4CalmS3SW3SW5SW4W7W5W9
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2 days agoCalmCalmCalmCalmNW6NW6NW6NW5W5W7W4W6NW11NW9NW10NW10NW6SW6W10W6W6W5W6SW6

Tide / Current Tables for Glymont, Maryland
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Glymont
Click for Map
Mon -- 05:16 AM EST     -0.12 feet Low Tide
Mon -- 07:23 AM EST     Sunrise
Mon -- 10:48 AM EST     Moonrise
Mon -- 11:09 AM EST     1.64 feet High Tide
Mon -- 05:14 PM EST     Sunset
Mon -- 05:37 PM EST     -0.07 feet Low Tide
Mon -- 10:58 PM EST     Moonset
Mon -- 11:33 PM EST     1.61 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.51.10.70.30.1-0.1-0.10.30.81.21.51.61.51.20.90.50.2-0-0.10.20.61.11.41.6

Tide / Current Tables for Mount Vernon, Virginia
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Mount Vernon
Click for Map
Mon -- 05:48 AM EST     -0.15 feet Low Tide
Mon -- 07:23 AM EST     Sunrise
Mon -- 10:48 AM EST     Moonrise
Mon -- 11:39 AM EST     1.99 feet High Tide
Mon -- 05:14 PM EST     Sunset
Mon -- 06:08 PM EST     -0.08 feet Low Tide
Mon -- 10:58 PM EST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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21.61.10.60.2-0.1-0.10.10.61.21.71.921.71.30.80.40.1-0.100.411.51.8

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.
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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.