Friday, December15, 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 7:23AMSunset 4:49PM Friday December 15, 2017 10:09 PM EST (03:09 UTC) Moonrise 4:45AMMoonset 3:28PM Illumination 5% Phase: Waning Crescent; Moon at 27 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- 932 Pm Est Fri Dec 15 2017
.small craft advisory in effect from Saturday afternoon through Saturday evening...
Rest of tonight..W winds 10 kt. Waves 1 ft or less.
Sat..SW winds 10 to 15 kt. Waves 1 ft.
Sat night..NW winds 5 to 10 kt...becoming se late. Waves 1 ft or less.
Sun..SE winds 5 kt. Waves flat.
Sun night..S winds 5 kt. Waves flat.
Mon..SW winds 5 kt. Waves flat.
Mon night..SW winds around 5 kt. Waves flat.
Tue..W winds 5 to 10 kt. Waves 1 ft or less.
Wed..NW winds 10 to 15 kt...diminishing to 5 kt after midnight. Waves 1 ft.
ANZ500 932 Pm Est Fri Dec 15 2017
Synopsis for the tidal potomac and md portion of the chesapeake bay.. High pressure will build south of the waters through the weekend. A backdoor cold front will approach from the north Sunday, then return north as a warm front Monday.

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 160218 aaa
afdlwx
area forecast discussion... Updated
national weather service baltimore md washington dc
918 pm est Fri dec 15 2017

Synopsis
High pressure will build south of the area through early Sunday.

A weak backdoor cold front will stall over the area Sunday then
lift north as a warm front on Monday. A surface trof will move
across the area Tuesday. Weak high pressure builds over the area
during the second half of next week.

Near term through Saturday
Temperatures have dropped significantly this evening where skies
are clear and winds are light. Stratocumulus are seen over
eastern WV and western md where winds have picked up from the
west and are gusting over 25 mph. Temperatures in those areas
have jumped dramatically from the low 20s to near freezing in a
short period of time as seen at martinsburg. Temperatures will
bottom out in the upper teens east of the mtns in the next few
hrs but will likely rise overnight as winds strengthen and
mixing increases. There could be a few snow showers over the
mtns overnight as upslope flow increases potentially dropping as
much as half inch of snow. Any freezing fog this evening is
expected to dissipate by midnight as winds strengthen and mixing
increases. Overall, cold and breezy overnight.

Short term Saturday night through Sunday night
High pressure will remain to our south for Saturday and Saturday
night. A southwest flow around the high will usher in somewhat
milder conditions Saturday afternoon after a chilly start. Max
temps will be in the 40s for most areas.

High pressure will move offshore Sunday and a southerly flow
will usher in more moisture and somewhat milder conditions. Max
temps will be in the 40s for most areas with lower 50s in
central virginia. An upper-level disturbance will pass through
late Sunday and Sunday night. A few showers are possible... But
forcing from this system will be weak so any precipitation that
does fall will be light.

Long term Monday through Friday
Mild conditions expected during the long term period with dry
conditions on Monday as we sit between two boundaries and
southerly flow settles over our region. Some showers could
develop over higher elevations later on Monday and into Tuesday,
but still expecting mainly dry conditions over our cwa.

A cold front approaches Tuesday night increasing pops over our
area, but qpfs are not impressive. High pressure settles in
behind the front Wednesday into Friday with winds become
northwesterly... Then becoming southwesterly Thursday into
Friday as high pressure moves offshore.

Temperatures will be above normal in general with highs reaching
the 50s and 60s in most locations, except on Wednesday. Low
temperatures will be in the 30s and 40s, but colder on Wednesday
night.

Aviation 02z Saturday through Wednesday
Vfr conditions are expected tonight through Sunday morning. A
few showers are possible later Sunday and Sunday night along
with MVFR conditions... But confidence in precipitation is low at
this time.

Vfr conditions expected Monday into Wednesday. Maybe
sub-vfr conditions on Tuesday night as showers could move
through the terminals. Gusty winds expected on Wednesday, up
to 20 kt.

Marine
Low pressure will move out to sea tonight. A small craft
advisory is in effect for the maryland chesapeake bay south of
drum point and the lower tidal potomac river... Closer to the
gradient. High pressure will build to the south for tonight
through Saturday... But a tightening gradient will result in sca
conditions. The gradient will subside Saturday night and
Sunday. A weak disturbance will pass through Sunday night.

Winds are expected to stay below small craft advisory
threshold Monday into Tuesday. Winds could increase Tuesday
night into Wednesday behind a front, requiring a small craft
advisory over the waters.

Lwx watches warnings advisories
Dc... None.

Md... None.

Va... None.

Wv... None.

Marine... Small craft advisory from midnight tonight to 7 pm est
Saturday for anz530>534-537-539>541-543.

Small craft advisory from noon to 7 pm est Saturday for anz535-
536-538-542.

Synopsis... Bjl
near term... Lfr
short term... Bjl
long term... Imr
aviation... Bjl imr
marine... Bjl imr


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
WASD2 - 8594900 - Washington, DC 66 mi51 min SW 1 G 2.9 28°F 40°F1016.5 hPa
BLTM2 - 8574680 - Baltimore, MD 69 mi51 min WNW 1.9 G 5.1 26°F 46°F1015.5 hPa
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 72 mi51 min WSW 6 G 8 26°F 1016 hPa

Wind History for Washington, DC
(wind in knots)    EDIT      (on/off)   Help
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N5
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Hagerstown, Washington County Regional Airport, MD7 mi76 minWSW 710.00 miOvercast30°F18°F61%1015.7 hPa
Eastern WV Regional Airport/Shepherd Field, WV18 mi76 minW 17 G 2510.00 miOvercast32°F16°F52%1015 hPa

Wind History from HGR (wind in knots)
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Last 24hrE3NE4NE3NE4S3SW3S5SE5SE5SE6SE5S9S8S9S8S6SW4S6S3S3S3W5SW7SW5
1 day agoNW3CalmN3NW4CalmNW7CalmCalmCalmSW4NW14
G20
N9
G24
N12NW14NW18NW13
G23
W15NW14NW8NW7NW7NW7N7N5
2 days agoNW22
G32
NW26
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NW17W16
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G24
W15W9W6W3S3S9
G15
S4SE4Calm

Tide / Current Tables for Chain Bridge, D.C.
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Chain Bridge
Click for Map
Fri -- 12:47 AM EST     -0.18 feet Low Tide
Fri -- 04:41 AM EST     Moonrise
Fri -- 06:25 AM EST     2.57 feet High Tide
Fri -- 07:20 AM EST     Sunrise
Fri -- 12:50 PM EST     -0.14 feet Low Tide
Fri -- 03:26 PM EST     Moonset
Fri -- 04:47 PM EST     Sunset
Fri -- 06:45 PM EST     2.90 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-0-0.20.20.91.62.22.52.521.40.80.40-0.10.20.91.72.42.82.92.621.40.9

Tide / Current Tables for Chain Bridge, Washington, D.C.
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Chain Bridge
Click for Map
Fri -- 12:48 AM EST     -0.23 feet Low Tide
Fri -- 04:41 AM EST     Moonrise
Fri -- 06:27 AM EST     2.60 feet High Tide
Fri -- 07:20 AM EST     Sunrise
Fri -- 12:51 PM EST     -0.20 feet Low Tide
Fri -- 03:26 PM EST     Moonset
Fri -- 04:47 PM EST     Sunset
Fri -- 06:46 PM EST     2.93 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-0.1-0.20.10.81.62.22.62.52.11.50.80.3-0-0.20.10.91.72.32.82.92.621.40.9

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 (22,6,7,8)
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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.