Wednesday, July26, 2017 L-36.com


Marine Weather and Tides
Port Royal, VA

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 6:06AMSunset 8:26PM Wednesday July 26, 2017 12:30 AM EDT (04:30 UTC) Moonrise 8:38AMMoonset 9:43PM Illumination 7% 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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ANZ536 Tidal Potomac From Indian Head To Cobb Island- 1032 Pm Edt Tue Jul 25 2017
Rest of tonight..N winds 5 kt. Waves less than 1 ft.
Wed..SE winds around 5 kt. Waves 1 ft.
Wed night..S winds 5 kt. Waves less than 1 ft.
Thu..S winds 5 kt. Waves less than 1 ft. A chance of showers and tstms.
Thu night..S winds 5 kt. Waves less than 1 ft. Showers with a chance of tstms.
Fri..W winds 5 kt. Waves less than 1 ft. Showers and tstms likely.
Fri night..NW winds 5 to 10 kt. Waves 1 ft. A chance of showers and tstms.
Sat..N winds 5 to 10 kt. Waves 1 ft. A chance of showers and tstms.
Sun..N winds around 5 kt. Waves 1 ft. Winds and waves higher and visibilities lower in and near tstms.
ANZ500 1032 Pm Edt Tue Jul 25 2017
Synopsis for the tidal potomac and md portion of the chesapeake bay.. High pressure will build overhead through Wednesday. The next frontal system will approach on Thursday and pass through the region Friday. High pressure will return for the weekend. Small craft advisories may be needed Thursday through Saturday.

7 Day Forecast for Marine Location Near Port Royal, VA
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location: 38.22, -77.28     debug


Area Discussion for - Baltimore, MD/Washington
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Fxus61 klwx 260120
afdlwx
area forecast discussion
national weather service baltimore md washington dc
920 pm edt Tue jul 25 2017

Synopsis
High pressure will build into the mid atlantic tonight before
moving offshore Wednesday. A cold front will approach the area
Thursday before passing through Friday into Friday night. High
pressure is expected to return for the weekend.

Near term until 6 am Wednesday morning
High pressure is centered over the eastern great lakes this
evening, and with its eastward progress tonight, a light onshore
flow will eventually develop. Upper trough axis is moving
offshore now, and while stratocu has retreated closer to the pa
border, it may not completely exit northeast maryland. The
onshore flow beneath the subsidence inversion may allow the
clouds to spread back westward, but it looks like they will
remain east of the blue ridge (if even that far west). Patchy
fog may develop where there are clear skies and light winds
(most likely western valleys), although there's not a strong
signal in model data.

Light showers which have been observed over new jersey and
surrounding areas may eventually spread westward to the
chesapeake bay late tonight into Wednesday morning, where the
deepest moisture (albeit still only 500 ft or so deep) will
reside. Sprinkles may be a better expectation. Low temperatures
will be in the 60s for most locations.

Short term 6 am Wednesday morning through Friday night
Low fog stratus will mix out during the late morning or early
afternoon wed. No wx is expected in the afternoon as subsidence
inversion will remain quite strong. A warm front will lift
through the area Thu with warm humid air moving in. Scattered
showers t-storms expected in the afternoon mainly in the west,
then widespread showers t-storms Thu night into at least the
first half of Fri as wave of low pressure moves across. Still
uncertainty in timing of frontal wave moving across and
instability available given expected widespread clouds and
showers. Both a severe and flash flooding risk are present with
flash flooding having higher odds at this time given potential
for repeated activity.

Long term Saturday through Tuesday
A closed upper level low is forecast to swing across the mid-
atlantic region Saturday. Low pressure along a cold front will
likely be moving south of the mid-atlantic region. Showers may
linger into Saturday until the upper level trough axis swings
through by Saturday evening. High pressure will move into the region
behind the departing sfc low Saturday night. High pressure will
likely be in control into the start of the work week.

Aviation 01z Wednesday through Sunday
Bkn stratocu may never completely exit baltimore area. The
question is whether MVFR CIGS in nj NE pa will move into the
area with the introduction of onshore flow. Feel this is most
likely at mtn, with a conditional threat (sct in taf) at bwi,
dca, and iad. Patchy light fog also possible at cho and mrb,
although there's not a strong signal in guidance.

Vfr on Wednesday, with another chance of fog near mrb cho
Wednesday night.

Showers and t-storms likely Thu night and Fri with flying
restrictions likely at some point.

Improving weather Saturday night into sun.

Marine
Winds will continue to diminish through Wed night and
begin to strengthen Thu afternoon into sat. SCA conditions are
possible during this time. Smws may also be required due to
potential for convection.

Small craft conditions possible Saturday into Sunday, but winds
should be on the downward trend by Sat night.

Lwx watches warnings advisories
Dc... None.

Md... None.

Va... None.

Wv... None.

Marine... None.

Synopsis... Lfr
near term... Ads lfr
short term... Lfr
long term... Hsk
aviation... Ads hsk lfr
marine... Hsk lfr


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
NCDV2 15 mi42 min NW 1.9 G 2.9 71°F 84°F1021.3 hPa
PPTM2 - 8578240 - Piney Point, MD 40 mi42 min NNE 5.1 G 7
44061 - Upper Potomac, MD 41 mi42 min ENE 5.8 G 7.8 72°F 1021.9 hPa
SLIM2 - 8577330 - Solomons Island, MD 44 mi42 min N 4.1 G 5.1 76°F 84°F
LWTV2 - 8635750 - Lewisetta, VA 46 mi42 min ENE 7 G 8.9 78°F 83°F1021.5 hPa
WASD2 - 8594900 - Washington, DC 47 mi42 min NNE 1.9 G 2.9 75°F 85°F1022 hPa
BSLM2 - Chesapeake Bay, MD 49 mi120 min Calm 67°F 1022 hPa65°F
COVM2 - 8577018 - Cove Point LNG Pier, MD 49 mi42 min E 12 G 14 75°F 1022.4 hPa

Wind History for Piney Point, MD
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Fredericksburg, Shannon Airport, VA10 mi35 minN 010.00 miMostly Cloudy69°F63°F80%1022.3 hPa
Stafford, Stafford Regional Airport, VA15 mi35 minNW 410.00 miPartly Cloudy62°F61°F100%1024 hPa
Quantico Marine Corps Airfield - Turner Field, VA20 mi34 minWNW 710.00 miPartly Cloudy69°F64°F87%1022.9 hPa

Wind History from EZF (wind in knots)
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Last 24hr--------------------------N6N4N4N5N6N5N4N3CalmNW3N3
1 day ago------------------------------------------------
2 days ago------------------------------------------------

Tide / Current Tables for Corbins Neck, Rappahannock River, Virginia
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Corbins Neck
Click for Map
Wed -- 04:22 AM EDT     0.04 feet Low Tide
Wed -- 06:06 AM EDT     Sunrise
Wed -- 09:38 AM EDT     Moonrise
Wed -- 09:40 AM EDT     3.32 feet High Tide
Wed -- 04:54 PM EDT     -0.08 feet Low Tide
Wed -- 08:24 PM EDT     Sunset
Wed -- 10:13 PM EDT     3.16 feet High Tide
Wed -- 10:42 PM EDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
21.40.90.40.10.20.81.92.73.23.332.41.71.10.60.1-0.10.31.22.22.83.13

Tide / Current Tables for Port Royal, Rappahannock River, Virginia
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Port Royal
Click for Map
Wed -- 02:53 AM EDT     0.05 feet Low Tide
Wed -- 06:06 AM EDT     Sunrise
Wed -- 08:25 AM EDT     2.32 feet High Tide
Wed -- 09:37 AM EDT     Moonrise
Wed -- 03:25 PM EDT     -0.03 feet Low Tide
Wed -- 08:23 PM EDT     Sunset
Wed -- 08:59 PM EDT     2.20 feet High Tide
Wed -- 10:42 PM EDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.80.50.20.10.30.91.522.32.31.91.510.60.3000.51.11.72.12.221.7

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 (0,6,7,8)
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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.