Saturday, April21, 2018 L-36.com


Marine Weather and Tides
Halfway, MD

Version 3.4
What's New / NOTES
3/3/2018 - There is a new GOES Satellite for the east coast that required rewriting that part of the code. Please report any issues.
6/25/2017 - NOAA is having a major issue that impact the 7 day forecast load times. Many users are reporting problems. The issue has been reported.
5/23/2017 - Worked with NOAA again to speed up the 7 day forecast load times. Thanks to them for being responsive.

Sunrise 6:22AMSunset 7:56PM Saturday April 21, 2018 11:40 AM EDT (15:40 UTC) Moonrise 10:04AMMoonset 12:02AM Illumination 37% 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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ANZ538 Patapsco River Including Baltimore Harbor- 1032 Am Edt Sat Apr 21 2018
Rest of today..W winds 5 to 10 kt. Waves 1 ft.
Tonight..NW winds 5 kt. Waves less than 1 ft.
Sun..SE winds 5 kt. Waves flat.
Sun night..S winds 5 kt. Waves flat.
Mon..SE winds 5 to 10 kt. Waves 1 ft or less.
Mon night..SE winds 5 to 10 kt. Waves 1 ft.
Tue..E winds 5 to 10 kt. Waves 1 ft. Rain.
Wed..N winds 5 to 10 kt. Waves 1 ft. Rain in the morning, then showers through the night. A chance of showers after midnight.
ANZ500 1032 Am Edt Sat Apr 21 2018
Synopsis for the tidal potomac and md portion of the chesapeake bay.. An expansive area of high pressure will build eastward from the great lakes region this weekend, moving off the new england coast early next week. An area of low pressure over the deep south will approach the region mid week. Small craft advisories may be needed late Monday into Tuesday.

7 Day Forecast for Marine Location Near Halfway, MD
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location: 39.62, -77.79     debug


Area Discussion for - Baltimore, MD/Washington
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Fxus61 klwx 211420
afdlwx
area forecast discussion
national weather service baltimore md washington dc
1020 am edt Sat apr 21 2018

Synopsis
High pressure over the great lakes will slowly move east into
the northeast u.S. By Sunday night. This high will move offshore
Monday. A low pressure system will bring unsettled weather to
the region Monday night through the middle of next week.

Near term through tonight
Other than a fairly thin veil of cirrus, skies are mostly clear
across the region thanks to broad high pressure over the great
lakes region. Winds are light and variable.

Quiet weather conditions expected much of this weekend as high
pressure remains in control and gradually builds to the east
from the great lakes to the northeast u.S. Light winds and below
normal temperatures are expected as a result. Additional middle
and high clouds will move overhead this afternoon and linger
through tonight. High temperatures should reach the lower to
middle 60s this afternoon. With the additional middle level
clouds and increasing low level dewpoint temperatures, we don't
anticipate freezing temperatures for a third night in a row
tonight, and in fact it looks like this morning may have been
the last freeze of the season for many areas, or at least for
while. Low temperatures will bottom out in the upper 30s to
lower 40s.

Short term Sunday through Monday night
High pressure will continue to provide limited sunshine and
tranquil conditions Sunday into Sunday night. High temperatures
Sunday will reach the lower to middle 60s, while low
temperatures will drop down into the middle 40s and near 40 in
the western ridges and along the mason-dixon region. There could
be a sprinkle over the mountains, but it should generally be
dry.

As the high pressure moves offshore Monday, winds will become
more persistently from the southeast, bringing additional
moisture into the region. A cut-off low pressure system will
work its way up the east coast from the southeast u.S. To the
carolinas Monday and Monday night. Some rain should begin to
overspread the region from southwest to northeast, beginning
with the central shenandoah valley. Temperatures Monday could be
just a few degrees below normal.

Long term Tuesday through Friday
Unsettled weather conditions expected Tuesday into Wednesday as
low pressure over the southeastern u.S. And an upper level
cutoff low over tn ky nears our region. Rain chances will be
increasing during the day on Tuesday from southwest to northeast
as low pressure spreads northeastward. Models trending to favor
the latter half of Tuesday before the rain moves in to the
metro areas, with our far southwestern zones seeing activity
pick up early Tuesday morning. Continued rain chances expected
to persist in to the day on Wednesday as weak surface low
pressure hovers near the carolina coastline and mid level
troughing starts to dampen a bit. This low pressure area will
move off to the northeast during the day on Wednesday, bringing
a downward trend to shower activity across the region.

Another shortwave trough will approach from the west Wednesday
night and Thursday as surface low pressure passes to our west,
bringing additional moisture and isentropic lift across the
area. Some model differences remain with regards to the strength
of these features and ultimately the coverage amount of rain
during this time period. The stubborn mid to upper level
troughing will hang around on Friday, as surface low pressure
passes to our north, and a cold front looks poised to move
through the mid atlantic region Friday night.

Below normal temperatures will be maintained Tuesday and
Wednesday with elevated moisture and increased cloud coverage,
with a return to near normal temperatures Thursday and Friday,
potentially breaking the 70 degree mark for portions of the area
to close out the work week.

Aviation 14z Saturday through Wednesday
Vfr conditions expected through Monday with light and variable
winds, becoming southeast 5 to 10 knots by Monday afternoon.

MVFR conditions are possible at the cho terminal Monday night
with some light rain approaching from the southwest.

Sub-vfr conditions expected Tuesday through Wednesday as a
broad area of low pressure will impact the terminals with
increasing rain chances. Heaviest rain and ultimately greatest
flight restrictions will likely occur Tuesday night into
Wednesday morning, where ifr lifr conditions will be possible.

Increasing easterly breezes are forecast Tuesday into Wednesday,
with gusts nearing 20 knots Tuesday. As the main area of low
pressure starts to pull away from the area Wednesday, winds will
abate a bit, backing out of the north northeast and turning
light, with MVFR vis CIGS likely persisting into Wednesday
night.

Marine
No marine hazards expected through Monday morning. Winds will
be light and variable, becoming southeast around 10 knots by
Monday morning. Small craft advisory conditions may be possible
Monday afternoon and night. Winds southeast becoming east 10 to
15 knots with possible gusts up to 20 knots.

A broad area of low pressure will impact the waters Tuesday
into Wednesday, with SCA conditions likely during this time
period as a strong easterly flow develops across the area. As
low pressure starts to move off to the northeast on Wednesday,
sub-sca conditions forecast to return for the latter half of the
day.

Tides coastal flooding
Persistent onshore flow is expected to result in increased
tidal anomalies and possible coastal flooding during the middle
part of next week.

Lwx watches warnings advisories
Dc... None.

Md... None.

Va... None.

Wv... None.

Marine... None.

Synopsis... Klw
near term... Klw rcm
short term... Klw rcm
long term... Bkf
aviation... Bkf klw rcm
marine... Bkf klw rcm
tides coastal flooding... Bkf


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
WASD2 - 8594900 - Washington, DC 66 mi41 min S 2.9 G 7 50°F 53°F1032.5 hPa (+0.0)
BLTM2 - 8574680 - Baltimore, MD 69 mi41 min ENE 1.9 G 2.9 49°F 50°F1031.9 hPa (+0.0)
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 72 mi41 min NNW 5.1 G 6 48°F 1032.4 hPa (+0.0)

Wind History for Washington, DC
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G21
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NW15
G29
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G26
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G18
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G12
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NW5
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G8
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G11
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G6
S3

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Hagerstown, Washington County Regional Airport, MD7 mi48 minN 010.00 miFair49°F28°F44%1033.2 hPa
Eastern WV Regional Airport/Shepherd Field, WV18 mi48 minN 010.00 miFair49°F26°F41%1031.8 hPa

Wind History from HGR (wind in knots)
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Last 24hrNW17
G23
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NW19NW14N15
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N12
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N11
G21
NW12NW13
G18
NW7NW7NW3NW4E6CalmCalmN5W3CalmCalmCalmNW3NW3Calm
1 day agoW16NW24
G31
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G36
NW22
G34
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G27
W10NW10NW8NW18
G25
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NW8NW8W4NW11W6NW8NW11NW16
G23
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NW14
2 days agoN6N3E33S5S7S6SE6E3E5E4NE3NE3S4NW7N11N7SE7NW7W6CalmW3SW9NW22
G27

Tide / Current Tables for Chain Bridge, D.C.
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Chain Bridge
Click for Map
Sat -- 12:57 AM EDT     Moonset
Sat -- 01:13 AM EDT     3.08 feet High Tide
Sat -- 06:23 AM EDT     Sunrise
Sat -- 07:45 AM EDT     0.39 feet Low Tide
Sat -- 11:03 AM EDT     Moonrise
Sat -- 01:20 PM EDT     3.51 feet High Tide
Sat -- 07:51 PM EDT     Sunset
Sat -- 08:49 PM EDT     0.28 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
2.83.132.51.91.30.80.50.40.61.32.33.13.53.432.41.71.20.70.40.30.61.3

Tide / Current Tables for Chain Bridge, Washington, D.C.
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Chain Bridge
Click for Map
Sat -- 12:57 AM EDT     Moonset
Sat -- 01:17 AM EDT     3.08 feet High Tide
Sat -- 06:23 AM EDT     Sunrise
Sat -- 07:50 AM EDT     0.36 feet Low Tide
Sat -- 11:03 AM EDT     Moonrise
Sat -- 01:24 PM EDT     3.50 feet High Tide
Sat -- 07:51 PM EDT     Sunset
Sat -- 08:50 PM EDT     0.23 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
2.83.132.51.91.30.80.50.40.61.32.33.13.53.432.41.71.20.70.40.20.51.3

Weather Map and Satellite Images
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wmap_A
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.
target = "new">Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Baltimore, MD/Washington (11,2,3,4)
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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.