Monday, June26, 2017 L-36.com


Marine Weather and Tides
Halfway, MD

Version 3.4
What's New / NOTES
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.
5/19/2016 - There were issues with the 3 day airport observation history. I switched to another data source. Let me know if you see any issues with the data feeds.

Sunrise 5:43AMSunset 8:44PM Monday June 26, 2017 6:30 PM EDT (22:30 UTC) Moonrise 7:39AMMoonset 9:58PM Illumination 8% Phase: Waxing Crescent; Moon at 3 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- 432 Pm Edt Mon Jun 26 2017
.small craft advisory in effect from 9 pm this evening to 2 am edt Tuesday...
Rest of this afternoon..SW winds 10 kt. Waves 1 ft.
Tonight..NW winds 5 to 10 kt with gusts to 20 kt. Waves 1 ft.
Tue..W winds 5 to 10 kt. Waves 1 ft. A chance of showers and tstms.
Tue night..NW winds 5 to 10 kt. Waves 1 ft or less.
Wed..W winds 5 kt. Waves flat.
Wed night..S winds 5 to 10 kt. Waves 1 ft or less.
Thu..SW winds 10 to 15 kt. Waves 1 ft.
Fri..SW winds 5 to 10 kt. Waves 1 ft. Winds and waves higher and visibilities lower in and near tstms.
ANZ500 432 Pm Edt Mon Jun 26 2017
Synopsis for the tidal potomac and md portion of the chesapeake bay.. High pressure will build west of the area through Tuesday. A weak cold front will cross the waters Tuesday. High pressure will move over the area Wednesday before shifting offshore Thursday. Small craft advisory conditions are possible over portions of the waters Tuesday and again Thursday.

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 261854
afdlwx
area forecast discussion
national weather service baltimore md washington dc
254 pm edt Mon jun 26 2017

Synopsis A sharp upper level trough will move across the
region on Tuesday. High pressure builds over the area Wednesday
and moves offshore Thursday.

Near term through tonight Quiet conditions tonight under
weak high pressure. Some high clouds will start moving in late
tonight and early tue. Cool with lows in the 50s except mid 60s
in city centers.

Short term Tuesday through Wednesday night A sharp upper
level trough will move across the area late tomorrow. Strong
height falls will provide large scale forcing for showers and
thunderstorms to develop. Biggest limiting factor is lack of
low-level moisture and weak instability with CAPE values progged
at less than 250 j kg. Best coverage of showers will be east of
the blue ridge mtns where instability will be higher. Showers
will only produce very light rainfall due to relatively high
base clouds and a ton of mid-level dry air. Gusty winds and
small hail may be possible due to inverted-v soundings and very
cool temps aloft for this time of the year. -20c 500 mb temps
are progged which is near record low for late jun.

Trough axis moves east Tue evening with rapid clearing. High
pressure builds for Wed with tranquil weather.

Long term Thursday through Monday
High pressure will be in control Thursday through Thursday night,
bringing dry conditions and above normal temperatures. There
could be a stray shower along the mason-dixon region Thursday
night.

As high pressure moves over the western atlantic, warmer
temperatures and increasing chances of showers and thunderstorms
will develop Friday through Sunday. The best chance for showers and
storms will be Saturday and Sunday.

A second area of high pressure will build into the region Monday,
bringing more seasonable temperatures and dry conditions.

Aviation 19z Monday through Saturday Vfr conditions next 72
hrs. Widely scattered or scattered showers and t-storms are
expected tomorrow. No restrictions are anticipated. High
pressure builds for wed.

Vfr conditions Thursday and Thursday night. Winds southwest 10 knots
Thursday and Thursday night. MVFR to ifr conditions are possible
with showers and storms Friday and Friday night. Winds southwest 5
to 10 knots Friday and Friday night.

Marine Srly winds expected to strengthen tonight with sca
conditions. Winds will diminish toward morning. Very marginal
sca conditions possible tomorrow, but not enough confidence to
issue sca, however, gusty winds in showers or t-storms may
require mwss or even smws due to very dry environment and
potential for deep mixing.

Small craft advisories may be needed Thursday and Thursday night.

Winds southwest 10 to 15 knots gusts 20 knots. No marine hazards
expected Friday and Friday night. Winds southwest around 10
knots.

Lwx watches warnings advisories
Dc... None.

Md... None.

Va... None.

Wv... None.

Marine... Small craft advisory from 9 pm this evening to 2 am edt
Tuesday for anz531>533-538>541.

Small craft advisory from 9 pm this evening to 4 am edt
Tuesday for anz534-537-543.

Synopsis... Lfr
near term... Lfr
short term... Lfr
long term... Klw
aviation... Lfr klw
marine... Lfr klw


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
WASD2 - 8594900 - Washington, DC 66 mi42 min S 4.1 G 8 81°F 82°F1015.1 hPa
BLTM2 - 8574680 - Baltimore, MD 69 mi42 min WSW 2.9 G 11 81°F 79°F1015.3 hPa
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 72 mi42 min S 2.9 G 4.1 79°F 1015.6 hPa

Wind History for Washington, DC
(wind in knots)    EDIT      (on/off)   Help
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Hagerstown, Washington County Regional Airport, MD7 mi37 minSW 810.00 miPartly Cloudy79°F46°F31%1016 hPa
Eastern WV Regional Airport/Shepherd Field, WV18 mi37 minSSW 610.00 miMostly Cloudy75°F46°F37%1015 hPa

Wind History from HGR (wind in knots)
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Last 24hrW8W6W6SW6SW4SW5NW5CalmW5SW5SW5SW5SW3SW5W6W9NW116SW6W7SW10SW9SW7SW8
1 day agoSW6SW5SW7SW5W5CalmS3SW4W4SW3SW5W3Calm3W64S6W10W9
G17
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2 days agoS13
G21
NW4NW9CalmSE5NE3NW53N6NW7W7W4W8SW6NW13W13W16W14W11W10W13W9W8SW7

Tide / Current Tables for Chain Bridge, D.C.
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Chain Bridge
Click for Map
Mon -- 05:22 AM EDT     0.04 feet Low Tide
Mon -- 05:44 AM EDT     Sunrise
Mon -- 08:37 AM EDT     Moonrise
Mon -- 10:56 AM EDT     3.75 feet High Tide
Mon -- 06:08 PM EDT     -0.16 feet Low Tide
Mon -- 08:37 PM EDT     Sunset
Mon -- 10:54 PM EDT     Moonset
Mon -- 11:37 PM EDT     3.32 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
2.92.21.50.90.40.10.20.81.92.93.63.73.52.82.11.40.70.2-0.20.10.91.92.83.2

Tide / Current Tables for Chain Bridge, Washington, D.C.
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Chain Bridge
Click for Map
Mon -- 05:21 AM EDT     0.07 feet Low Tide
Mon -- 05:44 AM EDT     Sunrise
Mon -- 08:37 AM EDT     Moonrise
Mon -- 10:56 AM EDT     3.70 feet High Tide
Mon -- 06:08 PM EDT     -0.13 feet Low Tide
Mon -- 08:37 PM EDT     Sunset
Mon -- 10:54 PM EDT     Moonset
Mon -- 11:36 PM EDT     3.27 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
2.92.21.50.90.40.10.20.81.92.93.53.73.42.82.11.40.80.2-0.10.10.91.92.73.2

Weather Map and Satellite Images
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Weather Map
wmap_A
IR Satellite Image from GEOS
east_satellite

GOES Local Image of Mid-Atlantic    EDIT
Geos

Wind Forecast for Baltimore, MD/Washington (18,4,5,8)
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Ground Weather Radar Station Sterling, VA
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weather_mapweather_map weather_map

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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.