Friday, June23, 2017 L-36.com


Marine Weather and Tides
Woodbridge, VA

Version 3.4
What's New / NOTES
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 8:39PM Friday June 23, 2017 4:50 PM EDT (20:50 UTC) Moonrise 4:26AMMoonset 7:09PM Illumination 0% Phase: New Moon; Moon at 29 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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ANZ535 Tidal Potomac From Key Bridge To Indian Head- 432 Pm Edt Fri Jun 23 2017
.small craft advisory in effect through Saturday afternoon...
Rest of this afternoon..SW winds 15 kt with gusts to 25 kt. Waves 1 ft. Scattered showers with isolated tstms.
Tonight..SW winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft. Showers. Vsby 1 nm or less.
Sat..W winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft. A chance of showers.
Sat night..NW winds 5 to 10 kt. Gusts up to 20 kt in the evening. Waves 1 ft.
Sun..W winds 5 to 10 kt. Waves 1 ft.
Sun night..NW winds 5 to 10 kt. Waves 1 ft.
Mon..NW winds around 5 kt. Waves 1 ft.
Tue..NW winds 5 kt. Waves less than 1 ft. Winds and waves higher and visibilities lower in and near tstms.
ANZ500 432 Pm Edt Fri Jun 23 2017
Synopsis for the tidal potomac and md portion of the chesapeake bay.. High pressure will remain offshore today while a cold front slowly approaches from the northwest. The remnants of cindy will track along the front tonight, with the front finally pushing through on Saturday. A weak secondary front will cross Sunday before high pressure returns early next week. Small craft advisory conditions are possible Sunday.

7 Day Forecast for Marine Location Near Woodbridge, VA
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location: 38.65, -77.22     debug


Area Discussion for - Baltimore, MD/Washington
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Fxus61 klwx 231900
afdlwx
area forecast discussion
national weather service baltimore md washington dc
300 pm edt Fri jun 23 2017

Synopsis
Tropical air will envelop the area today. A cold front will
cross the area late tonight into Saturday. High pressure will
return Sunday and persist through early next week.

Near term through tonight
In spite of pockets of insolation, atmosphere within the forecast
area capped, as evidenced by the lack of agitated cumulus on
satpix and just showers on radar. The same cannot be said across
western pennsylvania down the ohio valley, in vicinity of the
frontal zone. Storms in that region shear-driven, and that will
be our concern tonight.

Recent runs of hrrr rap both depict some enhancement of the
showers in virginia. Given 1500-2000 j kg sbcape, expect some
thunder to develop by mid-late afternoon. That area should be
scattered in nature and have a diurnal component to it.

By 21-22 utc, the line of thunderstorms, and scattered storms
ahead of the line, will be approaching the potomac highlands.

With loss of daytime heating and residual inhibition, expect a
weakening trend in the strength of convection. But, the overall
coverage in the highlands will be increasing. Precipitable
water above 2 inches suggests that heavy rain can be expected
within any thunderstorm.

Latest model guidance (12 utc cycle) offers a quicker timing.

The southwesterly low level jet will be substantive (60-70 kt at
850 mb), so anticipate that some thunder can be expected tonight
even without daytime heating. As has been discussed the past
couple of days, the question remains whether these storms can
root in the boundary layer east of the appalachians. If they
can, it will be busy, with low-topped rotating updrafts. While
heavy rain can be expected too, the system overall remains
progressive (quicker than previously modeled), which will
preclude greater issues.

Bottom line... Have categorical pops crossing forecast area
between midnight and 6 am (likely beginning mid-evening), with
heavy rain possible. With dewpoints in the lower 70s, low
temperatures follow suit.

Short term Saturday through Sunday night
Latest GFS nam prog timing to be so quick that all precip will
be east of the forecast area by the start of the period. Am a
little bit caution of that solution, and have lingered some
precip into the Saturday morning hours. Then we'll need to
assess how quickly front leaves area; there are some suggestions
in may get caught up across southern maryland or the virginia
tidewater. Otherwise, high pressure will be building across the
area this weekend, with no other weather hazards. Perhaps there
will be a reinforcing boundary Sunday, but moisture looks scant
for even clouds.

Accepted a MOS blend for temps. Sunday will be the cooler day,
with lower dewpoints also advecting in Saturday.

Long term Monday through Friday
Surface high pressure sets to the west on Monday as a slow
moving upper level trough slides east into Tuesday with surface
westerly flow. Below normal temperatures, with showers and
thunderstorms possible during this period.

Conditions should become drier as surface high settles overhead
Tuesday night. The high will move offshore on Wednesday and continue
moving west into Thursday as flow becomes more southerly.

Temperatures will be on the rise as dry conditions continue into
Friday, when guidance suggest a boundary will bring showers and
thunderstorms over our area.

Aviation 19z Friday through Wednesday
Vfr flight condition across the terminals this afternoon. There
is an outside chance of a shower or tstm, but odds much too low
for a TAF inclusion.

A cold front, infused with tropical moisture, will cross the
terminals tonight, most likely after midnight but before dawn.

At this point, kept restrictions at MVFR. There is a decent
potential of local brief ifr, probably due more to reduced vsbys
in heavy rain. There may also be localized wind gusts. Where
these gusts aren't realized, there is a 50-70 kt wind max
several thousand feet off the deck, so low-level wind shear will
be a concern.

The front will be east of the terminals by Saturday morning.VFR
conditions will prevail for the weekend.

Mostly dryVFR conditions expected Monday into Wednesday as
surface high pressure settles in. Some scattered showers and
thunderstorms possible Monday afternoon into Tuesday as upper
air disturbance moves through, which could cause periods of sub-
vfr conditions.

Marine
Southwest winds 10-15 kt with some gusts to 20 kt. Those winds
will be increasing ahead of a cold front tonight. Small craft
advisories remain in effect. There will be a 50+ kt low level
jet several thousand feet off the waters overnight. Do not
believe this will mix down in the gradient flow, but local
punches may near heavier showers. Marine warnings may be
required tonight.

Northwest flow Saturday will contain better mixing. The
gradient will decease Saturday night. Have not extended the
advisory further at this time.

Mostly dry conditions expected Monday into Wednesday as surface
high pressure settles in. Some scattered showers and
thunderstorms possible Monday afternoon into Tuesday as upper
air disturbance moves through. Winds gusts will be below the
small craft advisory criteria.

Hydrology
As mentioned above, precip waters will be exceeding 2 inches, so
heave rain expected in storms tonight. However, only 0 1 to 0.3
inches fell this morning, so soils were not saturated. Further,
storms look to be progressive. So, while heavy rain expected,
believe that the soil will be able to handle it overall, based
on flash flood guidance. Thus, will not post any watches at this
time. Local minor flooding is possible, especially in the
potomac highlands.

Tides coastal flooding
Tides have started to spike, especially in the northern bay,
where departures are now greater than a half foot above normal.

The early morning tide cycle will be susceptible for minor
flooding. Beyond that, northwest winds should lead to levels
returning close to normal.

Lwx watches warnings advisories
Dc... None.

Md... None.

Va... None.

Wv... None.

Marine... Small craft advisory until 6 pm edt Saturday for anz530>543.

Synopsis... Rcm
near term... Hts
short term... Hts
long term... Imr
aviation... Hts imr
marine... Hts imr
hydrology... Hts
tides coastal flooding... Hts


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
44061 - Upper Potomac, MD 14 mi62 min WSW 12 G 14 79°F 82°F1008.5 hPa
WASD2 - 8594900 - Washington, DC 19 mi50 min SW 9.9 G 17 83°F 83°F1006.8 hPa (-1.0)
NCDV2 25 mi50 min SW 8 G 9.9 84°F 80°F1007.3 hPa (-1.4)
BSLM2 - Chesapeake Bay, MD 29 mi140 min SSW 8 82°F 1008 hPa72°F
44062 - Gooses Reef, MD 43 mi40 min WSW 7.8 G 9.7 82°F 2 ft1008.8 hPa
TPLM2 - Thomas Point, MD 45 mi50 min SW 23 G 26 83°F 78°F
44063 - Annapolis 46 mi40 min WSW 18 G 23 84°F 1 ft1006.8 hPa
APAM2 - 8575512 - Annapolis, MD 46 mi50 min 88°F 1006.4 hPa (-1.4)
COVM2 - 8577018 - Cove Point LNG Pier, MD 47 mi50 min WSW 11 G 15 84°F 1008.8 hPa (-1.2)
SLIM2 - 8577330 - Solomons Island, MD 47 mi50 min SW 13 G 19 84°F 77°F

Wind History for Washington, DC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Fort Belvoir, VA6 mi1.9 hrsS 710.00 miFair85°F73°F68%1008.4 hPa
Quantico Marine Corps Airfield - Turner Field, VA11 mi1.9 hrsSW 9 G 1510.00 miLight Rain84°F75°F77%1008.7 hPa
Manassas, Manassas Regional Airport/Harry P. Davis Field, VA17 mi54 minSSW 810.00 miLight Rain80°F75°F85%1008.6 hPa
Washington/Reagan National Airport, DC, VA18 mi58 minSSW 19 G 2410.00 miLight Rain and Breezy84°F73°F72%1007.6 hPa
Stafford, Stafford Regional Airport, VA21 mi75 minSW 510.00 miFair81°F75°F83%1010.2 hPa
Camp Springs / Andrews Air Force Base, MD22 mi1.9 hrsSW 18 G 2510.00 miPartly Cloudy and Breezy85°F72°F67%1008.5 hPa

Wind History from DAA (wind in knots)
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Last 24hrSW4S4S3CalmCalmCalmSE3CalmS4S3CalmCalmSW3SW3SE3S5S7S5S6
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1 day agoS5S6S4CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmS3CalmS3CalmS6SW4W5SW5S4
2 days agoS7S10
G19
S9S4SE3CalmS4CalmCalmS3S3CalmCalmCalmCalmS6SW3S6S8S6SW4NW6W7S5

Tide / Current Tables for High Point, Occoquan Bay, Virginia
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High Point
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Fri -- 12:49 AM EDT     0.07 feet Low Tide
Fri -- 05:26 AM EDT     Moonrise
Fri -- 05:45 AM EDT     Sunrise
Fri -- 06:41 AM EDT     2.13 feet High Tide
Fri -- 01:50 PM EDT     -0.04 feet Low Tide
Fri -- 07:21 PM EDT     1.79 feet High Tide
Fri -- 08:08 PM EDT     Moonset
Fri -- 08:37 PM EDT     Sunset
Fri -- 10:32 PM EDT     New Moon
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.10.10.20.71.31.82.12.11.91.510.70.30.1-00.20.71.21.61.81.71.410.6

Tide / Current Tables for Deep Point, Mattawoman Creek, Potomac River, Maryland
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Deep Point
Click for Map
Fri -- 12:36 AM EDT     0.08 feet Low Tide
Fri -- 05:26 AM EDT     Moonrise
Fri -- 05:45 AM EDT     Sunrise
Fri -- 06:28 AM EDT     2.15 feet High Tide
Fri -- 01:39 PM EDT     -0.02 feet Low Tide
Fri -- 07:09 PM EDT     1.80 feet High Tide
Fri -- 08:08 PM EDT     Moonset
Fri -- 08:36 PM EDT     Sunset
Fri -- 10:32 PM EDT     New Moon
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.10.10.30.81.41.92.12.11.81.410.60.30-00.30.81.31.61.81.71.30.90.6

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 (16,3,4,5)
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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.