Monday, January20, 2020
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Marine Weather and Tides
Baltimore, 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 7:20AMSunset 5:13PM Monday January 20, 2020 10:56 AM EST (15:56 UTC) Moonrise 3:30AMMoonset 1:39PM Illumination 21% Phase: Waning Crescent; Moon at 25 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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ANZ538 Patapsco River Including Baltimore Harbor- 938 Am Est Mon Jan 20 2020
.small craft advisory in effect until 6 pm est this evening...
Rest of today..NW winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft. Tides 1 ft below normal.
Tonight..N winds 10 kt. Waves 1 ft.
Tue..NW winds 5 to 10 kt. Waves 1 ft.
Tue night..NW winds 5 to 10 kt. Waves 1 ft.
Wed..N winds 5 kt. Waves flat.
Wed night..N winds around 5 kt. Waves flat.
Thu..Light winds. Waves flat.
Fri..E winds around 5 kt. Waves 1 ft or less. A chance of rain through the night.
ANZ500 938 Am Est Mon Jan 20 2020
Synopsis for the tidal potomac and md portion of the chesapeake bay.. High pressure will build eastward from the northern plains during the first half of the week, then move offshore during the second half of the week. A small craft advisory may be needed for portions of the waters Tuesday night.


7 Day Forecast for Marine Location Near Baltimore, MD
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location: 39.28, -76.58     debug


Area Discussion for - Baltimore, MD/Washington
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FXUS61 KLWX 201501 AFDLWX

Area Forecast Discussion National Weather Service Baltimore MD/Washington DC 1001 AM EST Mon Jan 20 2020

SYNOPSIS. A large area of high pressure will move from the northern Plains during the first half of the week, centered overhead by Wednesday. The high will move offshore during the second half of the week, then low pressure will approach from the central United States for Saturday.

NEAR TERM /THROUGH TONIGHT/. Arctic surface high pressure 1044 mb over the northern plains will continue to expand east and dominate the weather across the eastern US through Thursday. Except for the far western upslope areas . conditions today will features breezy conditions and cold temperatures under sunny skies. Temperatures will average below seasonal normals today with mid 30s DC and lower 30s Baltimore areas.Wind chill readings this morning continue in the teens to lower 20s east of the Blue Ridge . with even single digit wind chills at times this morning at higher elevations west of the Blue Ridge. Northwest winds will continue gusty through this afternoon ranging from 20 to 30 mph. Upslope flurries will continue through around noontime but should taper off as moisture levels decrease through the afternoon there.

Tonight as the surface high build east, excellent radiational cooling will exist under clear skies although northwest winds will continue overnight helping to promote some mixing. Lack of snow cover other than along the western slopes will help keep temperatures from tanking too far..but a few single digits could occur in some of the sheltered valley locations across western areas.

Previous Short/Long term discussions follow .

SHORT TERM /TUESDAY THROUGH WEDNESDAY NIGHT/. Upper troughing will gradually lose its influence Tuesday and Wednesday, allowing the surface high to spread eastward. Ridging aloft will be overhead by Wednesday. Dry conditions are expected, and other than a batch or two of passing cirrus, skies should be mainly clear as well. Daytime highs will moderate a bit each day, with 40s becoming common again by Wednesday. Winds will become less of a factor as well. Lows will respond more slowly given favorable radiational cooling conditions continuing. Teens and 20s are expected both Tuesday and Wednesday nights.

LONG TERM /THURSDAY THROUGH SUNDAY/. High pressure will be in control on Thursday while mid to upper level trough deepens over the central CONUS, resulting in a mid- level cut-off low by Friday. At the surface, low pressure system will develop, but it is uncertain on location as deterministic and ensemble means develop it either over the Midwest or over the Tennessee Valley. This is followed by an ENE track that will increase the chances of precipitation over our region Friday night. The low pressure will then either move over us from the SW or will transfer its energy from the Great Lakes into a coastal low on Saturday. Either solution brings precipitation in form or rain or snow (mainly over higher elevations) between Friday night and Saturday night as the low deepens offshore. The low will move away from us Saturday night into Sunday with some lingering precipitation. Sunday night into Monday guidance suggests a shortwave trough could bring us some additional precipitation.

AVIATION /15Z MONDAY THROUGH FRIDAY/. VFR conditions expected through Friday. Gusty northwest winds will continue through mid afternoon, with peak gusts in the 20-25 kt range, then by late afternoon wind gust will diminish. Northwest winds tonight under clear skies.

MARINE. Small Craft Advisory conditions continue on all waters through noon. Gusty northwest winds continuing this afternoon. Blowout tides (-1 ft MLLW or lower) this morning for the northern Potomac and the upper reaches of the Chesapeake Bay. Wind gusts over the Upper Tidal Potomac are marginal for SCA conditions, but the middle/lower Potomac continue to quite gusty.

As the strong Arctic high pressure continues to build into the region, a tight pressure gradient across the Bay will result in continued gusty northerly winds tonight, with the advisory continuing for the wider waters south of Pooles Island, including the lower tidal Potomac. The high will be overhead by Wednesday, with light winds prevailing through Wednesday night.

Sub-SCA conditions expected Thursday into late Friday with high pressure in control.

LWX WATCHES/WARNINGS/ADVISORIES. DC . None. MD . None. VA . None. WV . None. MARINE . Small Craft Advisory until 10 AM EST Tuesday for ANZ531>534- 537-539>543. Small Craft Advisory until 6 PM EST this evening for ANZ530- 538. Small Craft Advisory until noon EST today for ANZ535-536.

SYNOPSIS . SMZ NEAR TERM . SMZ SHORT TERM . ADX LONG TERM . IMR AVIATION . ADS/SMZ MARINE . ADS/SMZ


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
BLTM2 - 8574680 - Baltimore, MD 1 mi56 min NNE 13 G 19 27°F 41°F1028.1 hPa (+2.9)
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 5 mi56 min N 16 G 21 26°F 1028.3 hPa (+3.0)
FSNM2 5 mi68 min NNW 18 G 22 26°F 1027.5 hPa
TCBM2 - 8573364 - Tolchester Beach, MD 18 mi56 min N 14 G 20 27°F 40°F1028.5 hPa (+3.1)
APAM2 - 8575512 - Annapolis, MD 21 mi56 min 28°F 1027.7 hPa (+2.9)
CPVM2 22 mi56 min 28°F
TPLM2 - Thomas Point, MD 27 mi56 min NW 18 G 20 27°F 41°F1028.7 hPa (+2.6)13°F
BSLM2 - Chesapeake Bay, MD 35 mi146 min NNW 7 1026 hPa
WASD2 - 8594900 - Washington, DC 37 mi56 min NNW 8 G 18 28°F 42°F1029.5 hPa (+2.7)
CHCM2 - 8573927 - Chesapeake City, MD 44 mi56 min N 8.9 G 16 26°F 39°F1027.9 hPa (+2.9)

Wind History for Baltimore, MD
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Baltimore, Inner Harbor, MD2 mi62 minno data mi28°F8°F43%1028.2 hPa
Baltimore, Baltimore-Washington International Airport, MD8 mi62 minNNW 13 G 1810.00 miFair29°F10°F45%1028.1 hPa
Baltimore / Martin, MD9 mi62 minWNW 1510.00 miClear30°F12°F47%1028.8 hPa
Fort Meade / Tipton, MD17 mi68 minNNW 11 G 1610.00 miFair28°F14°F55%1029.1 hPa
Annapolis, United States Naval Academy, MD21 mi62 minNW 13 G 2110.00 miFair28°F15°F58%1028.3 hPa

Link to 5 minute data for KDMH

Wind History from DMH (wind in knots)
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Last 24hr------------------------------------------------
1 day ago------------------------------------------------
2 days ago------------------------------------------------

Tide / Current Tables for Fells Point, Baltimore Harbor, Maryland
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Fells Point
Click for Map
Mon -- 02:18 AM EST     0.70 feet High Tide
Mon -- 03:29 AM EST     Moonrise
Mon -- 07:22 AM EST     Sunrise
Mon -- 08:53 AM EST     -0.49 feet Low Tide
Mon -- 01:38 PM EST     Moonset
Mon -- 03:35 PM EST     1.29 feet High Tide
Mon -- 05:12 PM EST     Sunset
Mon -- 10:50 PM EST     -0.04 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.30.60.70.70.50.2-0-0.3-0.4-0.5-0.4-0.10.30.71.11.31.31.210.70.50.20-0

Tide / Current Tables for Baltimore Harbor Approach, Maryland Current
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Baltimore Harbor Approach
Click for Map
Mon -- 01:12 AM EST     0.37 knots Max Flood
Mon -- 03:27 AM EST     -0.00 knots Slack
Mon -- 03:28 AM EST     Moonrise
Mon -- 06:45 AM EST     -0.69 knots Max Ebb
Mon -- 07:20 AM EST     Sunrise
Mon -- 09:35 AM EST     0.00 knots Slack
Mon -- 01:25 PM EST     1.19 knots Max Flood
Mon -- 01:38 PM EST     Moonset
Mon -- 05:05 PM EST     -0.00 knots Slack
Mon -- 05:12 PM EST     Sunset
Mon -- 08:19 PM EST     -0.95 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.30.40.30.1-0.2-0.4-0.6-0.7-0.5-0.20.20.611.21.20.90.50-0.4-0.8-0.9-0.9-0.7-0.4

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 (10,2,3,4)
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Ground Weather Radar Station Dover AFB, DE
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weather_mapweather_map weather_map

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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.