Tuesday, March26, 2019 L-36.com


Marine Weather and Tides
Ashton-Sandy Spring, MD

Version 3.4
What's New / NOTES
10/6/2018 Colors of tide XTide graphs changed to emphasize that they were upgraded. See next note. Comments welcome.
10/4/2018 I have fixed XTide and updated the harmonic files. There were some name changes so you might have to click EDIT to find the new station name.

Sunrise 7:00AMSunset 7:26PM Tuesday March 26, 2019 6:16 AM EDT (10:16 UTC) Moonrise 12:00AMMoonset 9:52AM Illumination 71% Phase: Waning Gibbous; Moon at 20 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- 437 Am Edt Tue Mar 26 2019
.small craft advisory in effect through this afternoon...
Rest of the overnight..N winds 10 kt with gusts to 20 kt. Waves 1 ft.
Today..N winds 10 kt with gusts to 20 kt. Waves 1 ft.
Tonight..N winds 5 to 10 kt. Waves 1 ft.
Wed..E winds 5 kt. Waves flat.
Wed night..SE winds 5 kt. Waves less than 1 ft.
Thu..S winds 5 to 10 kt. Waves 1 ft.
Thu night..S winds 5 to 10 kt. Waves 1 ft.
Fri..S winds 5 kt. Waves less than 1 ft.
Sat..SW winds 5 to 10 kt. Waves 1 ft. A chance of showers through the night.
ANZ500 437 Am Edt Tue Mar 26 2019
Synopsis for the tidal potomac and md portion of the chesapeake bay.. High pressure will build in from the great lakes through Wednesday and slide southeastward offshore Thursday and Friday. A cold front will approach the waters from the west this weekend. Small craft advisories may be needed Saturday.


7 Day Forecast for Marine Location Near Ashton-Sandy Spring, MD
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location: 39.15, -77     debug


Area Discussion for - Baltimore, MD/Washington
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Fxus61 klwx 260735
afdlwx
area forecast discussion
national weather service baltimore md washington dc
335 am edt Tue mar 26 2019

Synopsis
High pressure will build in from the great lakes through the
middle of the week and slide southeastward offshore late in the
week. A frontal boundary may approach the region on Friday. An
area of low pressure will then move eastward from the ohio
valley this weekend.

Near term until 6 pm this evening
Northerly flow has overspread the area and will continue through
the day as the area of low pressure pulls away and a strong
surface high builds eastward through the great lakes. Clouds
have begun their retreat southward early this morning and will
complete their evacuation of the region by mid to late morning
with full sunshine expected for the majority of the day. Dew
points have been slow to fall, but drier air is nearby across
pennsylvania and this will encompass the area by late morning or
so. Temperatures will run about 5-10 degrees below the normals
for the date, with highs from the upper 40s to low 50s. A breeze
up to about 20 mph or so will also be around making it feel a
bit chillier.

Short term 6 pm this evening through Thursday night
The surface high will move directly overhead tonight and slide
slightly eastward during the day Wednesday. This will lead to
clear skies and slackening winds tonight, with mostly sunny
skies expected again on Wednesday aside from a few high clouds.

With ideal radiational cooling conditions tonight, temperatures
will fall substantially, and lows by morning will range from
20-30f for most locations, except 30-34f in the urban centers
and along the tidal potomac chesapeake. Temperatures during the
day Wednesday will tick up slightly from today as the air mass
gradually moderates. Highs will range in the low to mid 50s.

The high will shift southeastward and further offshore by
Thursday promoting the development of southerly flow. Heights
will also begin to build aloft. This will lead to more rapidly
moderating temperatures and continued mainly dry conditions. As
a low pressure system moves well north of the area and a frontal
boundary sags southward, it is possible a stray shower or two
can make it into western md and eastern wv, although for now will
keep any probability of that below 20 percent for
Thursday Thursday night. Lows Wednesday night 30-35f, highs
Thursday in the low to mid 60s, and lows Thursday night in the
40s.

Long term Friday through Monday
A ridge of high pressure extending from the western atlantic across
the southeastern u.S. Will persist Friday and Saturday, with
primarily zonal flow aloft. This will promote mostly dry conditions
with above normal temperatures for late march. However, a stalled
frontal boundary will be lingering off to our north and west near
the ohio valley and lower great lakes region. This will be enough to
maintain low end chance pops in the forecast both days, with our
mountain zones favored with the higher pops.

The upper level pattern turns more cyclonic on Saturday as a trough
digs southward from canada and surface low pressure over the central
u.S. Tracks toward the great lakes. This will give the
aforementioned frontal boundary the kick needed to drive toward our
region heading into Sunday. The front and upper trough will swing
through the area by late Sunday, increasing shower chances area wide
during the day. Behind the frontal passage, high pressure will build
toward the region from the west Sunday night and Monday, before
settling overhead Monday night. Expect dry conditions and below
normal temperatures for the beginning of april.

Aviation 07z Tuesday through Saturday
Any early morning MVFR stratus will exit the region by 09z,
withVFR expected under clearing skies for the remainder of
today, and will persist through at least Thursday night with
high pressure nearby. Northerly winds will gust up to near 20
knots or so today, but winds lessen tonight through Wednesday
before turning southerly by Thursday.

Vfr conditions expected Friday and Saturday as southerly flow
dominates with high pressure to the south and east of the terminals.

Any precipitation threat will likely remain off to the north and
west through Saturday as a stalled frontal boundary lingers near the
ohio valley and lower great lakes region.

Marine
Today will feature northerly winds as high pressure builds in
from the great lakes with gusts 20-30 knots and SCA is in
effect. Winds are expected to diminish tonight as the surface
high moves overhead. Sub-sca winds are then expected under the
influence of high pressure through Thursday morning. The next
chance of SCA conditions will be later Thursday as southerly
flow increases, but this appears marginal at this time.

Sub-sca likely Friday, but SCA conditions will be possible on
Saturday and Saturday night under a gusty southerly flow with
high pressure off the southeast coast and a frontal boundary
lingering well northwest of the waters.

Lwx watches warnings advisories
Dc... None.

Md... None.

Va... None.

Wv... None.

Marine... Small craft advisory until 6 pm edt this evening for
anz530>532-535-536-538>540.

Small craft advisory until midnight edt tonight for anz533-534-
537-541>543.

Synopsis... Mm
near term... Mm
short term... Mm
long term... Bkf
aviation... Mm bkf
marine... Mm bkf


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
WASD2 - 8594900 - Washington, DC 19 mi29 min NNE 6 G 13 1021.4 hPa
BLTM2 - 8574680 - Baltimore, MD 24 mi29 min NE 11 G 15 1021.6 hPa
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 25 mi29 min N 16 G 19 38°F 1021.7 hPa
FSNM2 26 mi35 min N 17 G 22 37°F 1021 hPa
APAM2 - 8575512 - Annapolis, MD 30 mi29 min 1020.8 hPa
BSLM2 - Chesapeake Bay, MD 30 mi107 min N 5.1 42°F 1020 hPa33°F
CPVM2 34 mi29 min 42°F 21°F
TPLM2 - Thomas Point, MD 35 mi77 min N 24 G 26 43°F 46°F1020.2 hPa (+0.6)27°F
TCBM2 - 8573364 - Tolchester Beach, MD 40 mi29 min NNE 13 G 21 38°F 48°F1022 hPa

Wind History for Washington, DC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Gaithersburg - Montgomery County Airport, MD9 mi21 minVar 410.00 miPartly Cloudy34°F24°F67%1025.1 hPa
College Park Airport, MD12 mi33 minN 13 G 2010.00 miMostly Cloudy39°F11°F32%1021.3 hPa
Fort Meade / Tipton, MD13 mi35 minNNE 11 G 1510.00 miPartly Cloudy37°F15°F41%1022.3 hPa
Baltimore, Baltimore-Washington International Airport, MD18 mi23 minN 710.00 miA Few Clouds37°F15°F41%1021.7 hPa
Washington/Reagan National Airport, DC, VA20 mi25 minN 1610.00 miOvercast43°F26°F51%1021.3 hPa
Baltimore, Inner Harbor, MD23 mi23 minno data mi39°F16°F39%1022 hPa
Camp Springs / Andrews Air Force Base, MD23 mi21 minN 1310.00 miMostly Cloudy40°F21°F46%1021.4 hPa

Wind History from GAI (wind in knots)
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Last 24hrCalmCalmCalmNE4E4N44NE8N5NE5NE65NE6NE4NE55N4NE43N3CalmN5N84
1 day agoCalmCalm--SW5SW5S7SW5S7S10SW8S5S5S3SE3CalmCalmCalmCalmE3CalmCalmNE3CalmSE3
2 days agoNW17
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NW10NW9NW9W9NW7--CalmCalmCalmCalmSW4

Tide / Current Tables for Chain Bridge, D.C.
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Chain Bridge
Click for Map
Tue -- 12:45 AM EDT     Moonrise
Tue -- 01:29 AM EDT     3.05 feet High Tide
Tue -- 07:02 AM EDT     Sunrise
Tue -- 07:51 AM EDT     0.14 feet Low Tide
Tue -- 10:52 AM EDT     Moonset
Tue -- 01:40 PM EDT     3.34 feet High Tide
Tue -- 07:26 PM EDT     Sunset
Tue -- 08:44 PM EDT     0.11 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.6332.51.91.20.60.30.10.41.22.12.93.33.332.41.71.10.60.20.10.51.3

Tide / Current Tables for Benning Bridge, D.C.
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Benning Bridge
Click for Map
Tue -- 12:45 AM EDT     Moonrise
Tue -- 01:25 AM EDT     3.17 feet High Tide
Tue -- 07:02 AM EDT     Sunrise
Tue -- 07:45 AM EDT     0.15 feet Low Tide
Tue -- 10:52 AM EDT     Moonset
Tue -- 01:36 PM EDT     3.47 feet High Tide
Tue -- 07:25 PM EDT     Sunset
Tue -- 08:38 PM EDT     0.12 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.83.13.12.61.91.20.60.30.20.51.32.333.43.432.41.71.10.60.20.20.61.4

Weather Map and Satellite Images
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GOES 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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Wind Forecast for Baltimore, MD/Washington (6,6,7,8)
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Ground Weather Radar Station Sterling, VA
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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.