Tuesday, December10, 2019
Privacy Policy
L-36.com


Marine Weather and Tides
Fallston, MD

Version 3.4
NOTICE
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.
6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

Sunrise 7:13AMSunset 4:43PM Tuesday December 10, 2019 1:13 AM EST (06:13 UTC) Moonrise 3:52PMMoonset 5:25AM Illumination 97% Phase: Waxing Gibbous; Moon at 13 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
    EDIT      (on/off)   Help
ANZ538 Patapsco River Including Baltimore Harbor- 1239 Am Est Tue Dec 10 2019
.small craft advisory in effect until 10 am est this morning...
Overnight..SW winds 15 kt with gusts to 20 kt. Waves 1 ft. Isolated showers.
Tue..W winds 10 kt. Waves 1 ft. Widespread showers. Patchy fog. Vsby 1 to 3 nm.
Tue night..NW winds 5 to 10 kt. Waves 1 ft. Rain and snow. Vsby 1 to 3 nm.
Wed..W winds 5 to 10 kt. Waves 1 ft. Snow likely. Patchy fog.
Wed night..NW winds 5 to 10 kt. Waves 1 ft.
Thu..NE winds 5 to 10 kt. Waves 1 ft.
Thu night..E winds 5 kt. Waves flat.
Fri..E winds 5 to 10 kt. Waves 1 ft or less. A chance of rain through the day, then showers likely through the night.
Sat..W winds 5 kt. Waves less than 1 ft. Showers likely through the day, then a chance of showers through the night.
ANZ500 1239 Am Est Tue Dec 10 2019
Synopsis for the tidal potomac and md portion of the chesapeake bay.. Low pressure will move from the great lakes into southeastern canada overnight, dragging its trailing cold front through the region Tuesday into Wednesday. High pressure will follow Wednesday night through Thursday. Small craft advisories will likely be needed Tuesday night and Wednesday.


7 Day Forecast for Marine Location Near Fallston, MD
   Hourly   EDIT   Help
location: 39.5, -76.5     debug


Area Discussion for - Baltimore, MD/Washington
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
FXUS61 KLWX 100226 AFDLWX

Area Forecast Discussion National Weather Service Baltimore MD/Washington DC 926 PM EST Mon Dec 9 2019

SYNOPSIS. Low pressure will move from the Great Lakes into Quebec overnight, dragging its trailing cold front through the region Tuesday. High pressure will build into the region late Tuesday night and remain through Thursday, before shifting offshore of New England as low pressure develops over and approaches from the southeastern United States.

NEAR TERM /THROUGH TUESDAY/. KLWX WSR-88D at 0130Z shows scattered light showers primarily east of Blue Ridge. Short-range HREF and HRRR has these scattered showers becoming more isolated as the overnight continues, with the overwhelming majority of the CWA staying dry between midnight and daybreak. Temperatures are not going to change much overnight, as low level moist advection and southerly flow keep pumping in warmer air. This will result in overnight lows 5-10 deg F above average. Gusty surface winds before midnight as evidenced by numerous surface reports throughout the CWA at 01Z of G15-25KTS, caused by a 60KT H85 jet which was directly overhead the CWA at 10/00Z. This low level jet will eject northeastward towards Cape Cod by midnight, and the winds will slacken after midnight.

SHORT TERM /TUESDAY NIGHT THROUGH WEDNESDAY NIGHT/. (02Z Update) . Rain showers will develop Tuesday morning, and will be prevalent by Noon across the entire CWA, especially along and east of Interstate 95. The cold front will pass through the area on Tuesday afternoon, which will start to filter in colder air. The 18Z ECMWF continues to be consistent with its prior 4 model runs with measurable snow across much of the CWA Tuesday night. There will be a brief lull in rainfall late tomorrow afternoon and early evening, before the region begins to feel the effects and influence of the right rear quadrant of a 170KT H3 jet which will be optimally positioned late Tuesday night providing jet induced dynamics. By 06Z Wed, the column should be cold enough to support all snow west of a line from Bel Air-Damascus-Sterling-Harrisonburg. Any pcpn that falls after 06Z west of this line will likely be all snow. East of this line, there will be a gradual transition from rain to a mixture to finally all snow by daybreak Wednesday. Accumulations along and east of I-95 will be limited as the race for the cold air to arrive in time before the precipitation departs will be on.

There will likely be a sweet spot in this colder region north and west of the Balt/Wash metro areas where 2-3 inches could accumulate on grassy surfaces, i.e., near the Catoctins, northern portions of Carroll, Baltimore, and Harford Counties, and along the Blue Ridge. Impact-wise, I am concerned about I-70 from eastern Frederick County to Hagerstown, and the confluence of other high-speed roads around Frederick MD, including the I-270 corridor from Frederick to Rockville. Motorists on the roads in these areas between midnight and daybreak will be prone to slick roads and low visibilities. The one thing that is working in favor of lesser accumulations on roadways is that temps will max out at least mid-50s CWA-wide today, and along and east of I-95 will be hovering in the lower 60s. I do think that snowfall early Wednesday morning will make its way to the Chesapeake, although the surface temps will still be AOA freezing, thus very unlikely to stick on roadways. I have updated the snow graphics reflecting grassy accumulations to the Bay, and slightly increased snowfall totals north and west of the major metro areas Reminder. official NWS snowfall forecasts are for accumulations on whiteboards/grassy areas, and not on road surfaces./End 02Z update/

The latest model guidance has honed in on the 10:00AM to 4:00PM window for greatest coverage of shower activity Tuesday, as low level convergence increases along an eastward advancing cold front and PVA associated with another mid level shortwave pivot across. Showers will probably become a bit less widespread for a time during the late afternoon and evening following the frontal passage, but coverage is expected to increase again by late evening into the overnight in concert with RRQ jet dynamics associated with a very strong upper jet.

Since the low level front will have passed by Tuesday night, temperatures will begin to cool. As such, rain is expected to change to snow. There is still uncertainty in the timing of temperatures becoming cold enough for snow, especially east of the Blue Ridge where downsloping and compressional warming effects tend to be most notable. Even when precipitation changes to snow, surface temperatures will likely be near or above freezing, so snow may have trouble sticking in the lower elevations. Overall, the setup remains largely unchanged, with typical run to run and model to model variability noted. The highest confidence in snowfall accumulations will be over the higher terrain (above about 1000 feet), with the higher elevations of north-central/northwestern Virginia likely to see the highest totals.

Even though boundary layer temperatures are expected to be marginal in the lower elevations and especially in the I-95 corridor, the timing of wintry precipitation lines up with the Wednesday morning commute, and the powerful mid/upper jet dynamics may result in localized heavier bands of precipitation, beneath which snowfall rates could overcome surface temps and result in accumulation even on paved surfaces.

Precipitation should come to an end by midday Wednesday, with gusty northwest winds ushering in an Arctic airmass in its wake.

LONG TERM /THURSDAY THROUGH MONDAY/. Guidance overall is in good agreement with the synoptic pattern concerning the long term. A strong area of high pressure moves eastward out of the Great Lakes region and extends down the majority of the Eastern Seaboard. The resultant is dry yet chilly conditions expected for Thursday. At the same time, low pressure develops over the Gulf of Mexico and will begin to lift northeastward late Thursday night into Friday.

While guidance is in better agreement about the timing of precip, there is still some spread in regards to timing, track and temperatures. The GFS/GEFS bring precipitation into the CWA by Friday morning, while the ECMWF/EPS delay precip onset by about 6 hours. Interesting to note that today's 12Z ECMWF suite advanced the precip by about 6 hours, compared to the 12 hour difference (from the GFS) it showed yesterday. Therefore, there is better confidence that precip onset will occur by Friday afternoon. With the chilly air mass in place, some wintry precipitation (freezing rain), will be possible at the onset, mainly near and west of the Blue Ridge. Elsewhere, mainly plain rain is most likely.

The low will exit the region by early Saturday morning with some partial clearing expected for the afternoon. Dry weather persists through Monday as temperatures remain slightly on the cooler side of normal.

AVIATION /02Z TUESDAY THROUGH SATURDAY/. IFR CIGS will prevail through 05Z/midnight then improve to LIFR and remain through daybreak. Winds should start to relax too after 05Z as the H85 ejects northeastward.

Latest guidance pegs the 15-21Z window Tuesday for most likely showers and sub-VFR CIGs/VSBYs. A brief respite is anticipated Tuesday evening, before precipitation re-develops and changes to snow after midnight. The most likely terminal to see accumulation is MRB, least likely at CHO/DCA, though there could be a quick coating even on paved surfaces at any terminal if a localized heavier band of snow moves overhead, overcoming marginal surface temperatures.

VFR returns by midday Wednesday with gusty NW winds. Another round of rain seems definite Friday afternoon into Saturday as coastal low pressure develops to the southwest and lifts northeast. Expect IFR conditions in moderate rain Fri night and Saturday. Mixed pcpn possible mainly near MRB.

MARINE. Winds will continue to blow SCA overnight as the H85 jet impacts continue. There will likely be a lull in the winds Tuesday, so the headline drops to just the lower most Maryland portion of the Chesapeake Bay and lower tidal Potomac. Winds likely increase in NW flow behind a cold front Tuesday night and especially Wednesday.

Winds lighten Wednesday night through Thursday night as high pressure builds overhead.

SCA conditions possible Friday into Saturday as pressure gradient tightens in advance of a coastal low pressure lifting northeast.

LWX WATCHES/WARNINGS/ADVISORIES. DC . None. MD . None. VA . None. WV . None. MARINE . Small Craft Advisory until 10 AM EST Tuesday for ANZ531>533- 538>542. Small Craft Advisory until 6 PM EST Tuesday for ANZ534-537-543. Small Craft Advisory until 6 AM EST Tuesday for ANZ530. Small Craft Advisory until 6 AM EST Tuesday for ANZ535-536.

SYNOPSIS . Lee NEAR TERM . Lee SHORT TERM . Lee(update)/DHOF LONG TERM . MSS AVIATION . LFR/DHOF MARINE . LFR/DHOF


Weather Reporting Stations
   EDIT       (on/off)   Help   NOTE: Click on distance to see the station location on a map
Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
BLTM2 - 8574680 - Baltimore, MD 17 mi68 min WSW 5.1 G 8 52°F 45°F1008.3 hPa
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 19 mi62 min SW 8.9 G 14 53°F 1008.6 hPa
TCBM2 - 8573364 - Tolchester Beach, MD 24 mi68 min SW 13 G 14 51°F 45°F1009.2 hPa
CPVM2 35 mi56 min 52°F
APAM2 - 8575512 - Annapolis, MD 36 mi56 min 54°F 1008.7 hPa
44063 - Annapolis 37 mi38 min SW 9.7 G 12 54°F 46°F1009.7 hPa
CHCM2 - 8573927 - Chesapeake City, MD 37 mi68 min SW 7 G 13 56°F 43°F1008.8 hPa
TPLM2 - Thomas Point, MD 42 mi74 min SSW 20 G 23 56°F 46°F1010.2 hPa (-1.1)52°F
DELD1 - 8551762 - Delaware City, DE 49 mi68 min WSW 5.1 G 13 57°F 46°F1008.4 hPa
RDYD1 - 8551910 - Reedy Point, DE 49 mi68 min 56°F 44°F1007.9 hPa

Wind History for Baltimore, MD
(wind in knots)    EDIT      (on/off)   Help
1
AM
2
AM
3
AM
4
AM
5
AM
6
AM
7
AM
8
AM
9
AM
10
AM
11
AM
12
PM
1
PM
2
PM
3
PM
4
PM
5
PM
6
PM
7
PM
8
PM
9
PM
10
PM
11
PM
12
AM
Last
24hr
SE2
SE3
SE5
E3
G8
W1
--
N1
W2
S1
S1
S3
S1
SW3
G8
W2
SW2
S2
G5
S2
S2
SW5
G9
SW9
G16
SW8
G14
W10
G15
W9
G14
W6
G12
1 day
ago
E1
--
E6
E5
G8
E3
E4
E3
E1
E3
SE1
S4
G9
S4
G9
SW4
G8
SW4
G10
S2
G6
S3
G7
S3
S3
SW3
G6
S1
S1
G4
S6
G12
SW3
SE4
2 days
ago
NE6
G9
N4
N6
NW2
N4
NE6
N5
G8
NW4
G13
N5
N4
G7
N3
N2
G5
NW3
NW2
NW2
N3
E1
W1
W1
W1

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports. Follow links for more data.
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Baltimore / Martin, MD12 mi39 minS 610.00 miOvercast54°F51°F94%1009.5 hPa
Baltimore, Inner Harbor, MD16 mi20 minno data mi53°F48°F86%1009 hPa
Baltimore, Baltimore-Washington International Airport, MD23 mi20 minSW 9 G 1410.00 miOvercast53°F48°F86%1008.4 hPa

Link to 5 minute data for KMTN

Wind History from MTN (wind in knots)
2
AM
3
AM
4
AM
5
AM
6
AM
7
AM
8
AM
9
AM
10
AM
11
AM
12
PM
1
PM
2
PM
3
PM
4
PM
5
PM
6
PM
7
PM
8
PM
9
PM
10
PM
11
PM
12
AM
1
AM
Last 24hrCalmCalmCalmNE5W4CalmCalmCalmCalmCalmSE4SE5S3CalmS4SE7SE4SE4S4S8S8S7
G14
S9
G14
S6
1 day agoCalmCalmCalmCalmCalmCalmCalmCalmCalmE3SE8SE8SE6S9SE8S3CalmCalmCalmCalm--SE9SE4Calm
2 days agoNW6NW7NW5CalmCalmCalmCalmNW3NW8NW9W10NW10W6W6CalmCalmCalmCalmCalmCalmCalmCalmCalmCalm

Tide / Current Tables for Bowley Bar, Middle River, Maryland
   EDIT   Weekend mode (on/off)   (on/off)   Help   One Week of Data
Bowley Bar
Click for Map
Tue -- 12:30 AM EST     0.23 feet Low Tide
Tue -- 05:24 AM EST     Moonset
Tue -- 05:26 AM EST     0.87 feet High Tide
Tue -- 07:14 AM EST     Sunrise
Tue -- 11:30 AM EST     -0.22 feet Low Tide
Tue -- 03:51 PM EST     Moonrise
Tue -- 04:42 PM EST     Sunset
Tue -- 06:25 PM EST     1.45 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

12
am
1
am
2
am
3
am
4
am
5
am
6
am
7
am
8
am
9
am
10
am
11
am
12
pm
1
pm
2
pm
3
pm
4
pm
5
pm
6
pm
7
pm
8
pm
9
pm
10
pm
11
pm
0.20.20.40.60.70.90.80.70.50.2-0.1-0.2-0.2-00.30.611.31.41.41.31.10.80.5

Tide / Current Tables for Battery Point, Gunpowder River, Maryland
   EDIT      (on/off)   Help   One Week of Data
Battery Point
Click for Map
Tue -- 12:57 AM EST     0.23 feet Low Tide
Tue -- 05:24 AM EST     Moonset
Tue -- 05:39 AM EST     0.87 feet High Tide
Tue -- 07:14 AM EST     Sunrise
Tue -- 11:57 AM EST     -0.22 feet Low Tide
Tue -- 03:51 PM EST     Moonrise
Tue -- 04:41 PM EST     Sunset
Tue -- 06:38 PM EST     1.45 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

12
am
1
am
2
am
3
am
4
am
5
am
6
am
7
am
8
am
9
am
10
am
11
am
12
pm
1
pm
2
pm
3
pm
4
pm
5
pm
6
pm
7
pm
8
pm
9
pm
10
pm
11
pm
0.30.20.30.50.70.80.90.80.50.30-0.2-0.2-0.10.10.50.91.21.41.41.31.10.90.6

Weather Map
       (on/off)   Help Weather Map
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 (1,6,7,8)
      (on/off)   Help

Ground Weather Radar Station Dover AFB, DE
   (on/off)   Help
weather_mapweather_map weather_map

Ad by Google

Cookie Policy:
This webiste uses cookies to save your settings. No personal information is saved. You can disable cookies in your browser if you like but it is not recommended for this site. I do not sell cookies. Go to a bakery for that. In fact I do not sell anything. To disable cookies from L-36.com, please refer to the Help button in your browser.
Privacy Policy:
I do not sell or share any user data or anything else for that matter. I do not keep site logs longer than I need to to keep bad actors off the site. Basically, I delete them after looking at them. If you are subject to CCPA, Google ads on this site will not be based on your past behavior so you will likely not see an ad for a lawn mower just because you looked for one at a big box website. I do not believe this site is subject to CCPA but I am doing what I can to follow the guidelines anyway.
Disclaimer:
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 numerious 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.