Saturday, January23, 2021
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Marine Weather and Tides
Kemps Mill, 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 7:23AMSunset 5:21PM Saturday January 23, 2021 2:41 AM EST (07:41 UTC) Moonrise 1:03PMMoonset 2:57AM Illumination 75% Phase: Waxing Gibbous; Moon at 10 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- 1240 Am Est Sat Jan 23 2021
.small craft advisory in effect through this evening...
Overnight..NW winds 10 kt with gusts to 20 kt. Waves 1 ft.
Sat..NW winds 10 to 15 kt. Gusts up to 30 kt. Waves 2 ft.
Sat night..NW winds 5 to 10 kt with gusts to 20 kt. Waves 1 ft.
Sun..W winds 5 kt. Waves less than 1 ft.
Sun night..E winds around 5 kt. Waves 1 ft.
Mon..E winds around 5 kt. Waves 1 ft. Rain with a chance of snow.
Mon night..E winds 5 kt. Waves less than 1 ft. Rain and snow.
Tue..N winds 5 to 10 kt. Waves 1 ft. Rain and snow in the morning.
Wed..N winds 5 kt. Waves less than 1 ft. A chance of snow through the night.
ANZ500 1240 Am Est Sat Jan 23 2021
Synopsis for the tidal potomac and md portion of the chesapeake bay.. High pressure over the midwest will build eastward through the weekend. Low pressure may impact the region early next week. Small craft advisories will likely be needed for portions of the waters through the weekend. Small craft advisories may be needed Monday into Tuesday.


7 Day Forecast for Marine Location Near Kemps Mill, MD
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location: 39.63, -77.79     debug


Area Discussion for - Baltimore, MD/Washington
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FXUS61 KLWX 230228 AFDLWX

Area Forecast Discussion National Weather Service Baltimore MD/Washington DC 928 PM EST Fri Jan 22 2021

SYNOPSIS. High pressure will gradually build over the region tonight through Sunday morning, then move offshore Sunday night. Low pressure will pass through the area Tuesday. High pressure will return for Wednesday and the second half of next week.

NEAR TERM /THROUGH SATURDAY/. Colder temperatures but dry conditions will evolve throughout the weekend. Gusty winds Saturday will make it feel much colder than the actual temperatures. High pressure will be in control through the period. Highs Saturday will only reach the 30s in many places. A brisk northwest wind will make it feel like temperatures are in the teens and 20s. A few snow showers will be possible across the mountains, but these will be of little significance.

SHORT TERM /SATURDAY NIGHT THROUGH SUNDAY NIGHT/. Still chilly Saturday night with temperatures in the 20s or middle teens in the west. Less wind Sunday with high pressure in control and temperatures remaining chilly with high temperatures in the middle to upper 30s. Thickening clouds Sun night as moisture increases ahead of low pressure over the central Plains. Any precip through 12Z Mon should remain well west of I-81 and in the form of snow with any accumulations less than an inch.

LONG TERM /MONDAY THROUGH FRIDAY/. High pressure off to our southeast will continue to slide further offshore early Monday as low pressure emerges out of the south- central US. Guidance has come into better agreement over the last 24 hours in regards to the track of the system. Given a negative EPO, PNA, and NAO, the pattern is more inducive of a inside tracking system (northeastward along the Appalachians) which is now being modeled by all guidance members. The question now becomes the timing of the system which will help determine p-types. As of now, precip onset looks to occur Monday morning and continue into the evening/overnight hours.

Overall, guidance has been trending downward in terms of snow accumulations and continues to trend more towards a wintry mix type of event, especially at onset until a more southerly flow at the surface scours out any cold air trapped in the BL. With a good amount of uncertainty still remaining, it appears that (at this time) areas best suited for any winter weather will be along the Mason Dixon Line and into western Maryland and the eastern Panhandle of WV.

Tuesday appears to be more of a transition day, as showers are likely to continue throughout much of the day; albeit the bulk of the precip will have ended. Canadian high pressure returns for Wednesday, resulting in dry conditions. Another low pressure system may impact the region Thursday into Friday. However, the trend is for the system to remain more towards our south. However, confidence this far out remains low and will have to continue to monitor forecast trends over the next several days. General temperature trend in the long term period looks to remain slightly below normal for this time of year.

AVIATION /03Z SATURDAY THROUGH WEDNESDAY/. Blustery conditions Sat with a brisk northwest wind and gusting to 30 to 35 mph. Winds will diminish Sunday with increasing clouds Sun night with any precip likely to hold off until after 12Z Monday.

CIG/VSBY restrictions are likely, especially by Monday afternoon as low pressure spreads northward across the terminals. Restrictions are likely to continue through Tuesday as the low slowly exits the region. However there's a good chance that conditions improve late Tuesday into Wednesday.

MARINE. Strong SCA conditions Saturday into Saturday night with winds diminishing Sun afternoon.

SCA will be possible Monday and Tuesday as low pressure spreads eastward across the waters. SubSCA conditions possible on Wednesday.

LWX WATCHES/WARNINGS/ADVISORIES. DC . None. MD . None. VA . None. WV . None. MARINE . Small Craft Advisory until 6 AM EST Sunday for ANZ530>534- 537>543. Small Craft Advisory until 8 PM EST Saturday for ANZ535. Small Craft Advisory until 1 AM EST Sunday for ANZ536.

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


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
WASD2 - 8594900 - Washington, DC 66 mi53 min WNW 11 G 19 38°F 40°F1016.9 hPa
BLTM2 - 8574680 - Baltimore, MD 69 mi53 min N 12 G 16 37°F 42°F1015.9 hPa
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 73 mi53 min NW 16 G 18 38°F 1016 hPa

Wind History for Washington, DC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Hagerstown, Washington County Regional Airport, MD6 mi48 minNW 15 G 2210.00 miOvercast31°F12°F45%1017.8 hPa
Eastern WV Regional Airport/Shepherd Field, WV18 mi48 minNW 17 G 2310.00 miOvercast33°F16°F49%1016.7 hPa

Link to 5 minute data for KHGR

Wind History from HGR (wind in knots)
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Tide / Current Tables for Chain Bridge, D.C.
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Chain Bridge
Click for Map
Sat -- 02:52 AM EST     Moonset
Sat -- 04:24 AM EST     2.24 feet High Tide
Sat -- 07:21 AM EST     Sunrise
Sat -- 10:10 AM EST     0.04 feet Low Tide
Sat -- 01:01 PM EST     Moonrise
Sat -- 04:36 PM EST     2.58 feet High Tide
Sat -- 05:19 PM EST     Sunset
Sat -- 11:27 PM EST     0.13 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.51.11.622.22.21.81.20.60.200.10.51.11.82.32.52.62.31.81.20.70.40.2

Tide / Current Tables for Chain Bridge, one mile below, D.C.
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Chain Bridge
Click for Map
Sat -- 02:52 AM EST     Moonset
Sat -- 04:18 AM EST     2.24 feet High Tide
Sat -- 07:21 AM EST     Sunrise
Sat -- 10:05 AM EST     0.04 feet Low Tide
Sat -- 01:01 PM EST     Moonrise
Sat -- 04:31 PM EST     2.58 feet High Tide
Sat -- 05:19 PM EST     Sunset
Sat -- 11:22 PM EST     0.13 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.51.11.722.22.11.71.10.60.200.10.51.21.92.32.52.52.21.71.20.70.40.2

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




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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.