Friday, June22, 2018 L-36.com


Marine Weather and Tides
Olney, MD

Version 3.4
What's New / NOTES
5/20/2018 -- NOAA is having problems with the data feed that I use to draw the graphs. They are aware of the issue and working to resolve it. Sometimes changing the location by about a mile will give a correct graph. 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.

Sunrise 5:41AMSunset 8:39PM Friday June 22, 2018 10:43 PM EDT (02:43 UTC) Moonrise 2:26PMMoonset 1:25AM Illumination 73% Phase: Waxing Gibbous; Moon at 10 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- 1032 Pm Edt Fri Jun 22 2018
Rest of tonight..E winds 5 to 10 kt. Waves 1 ft. A slight chance of tstms. Showers likely with areas of drizzle. Patchy fog late this evening. Patchy fog with vsby 1 to 3 nm.
Sat..SW winds 5 to 10 kt. Waves 1 ft. A chance of showers, tstms with areas of drizzle. Patchy fog. Vsby 1 to 3 nm.
Sat night..SW winds 5 to 10 kt. Waves 1 ft. A chance of showers and tstms.
Sun..W winds 5 to 10 kt. Waves 1 ft. A chance of showers and tstms.
Sun night..NW winds 5 to 10 kt. Waves 1 ft.
Mon..N winds 5 to 10 kt. Waves 1 ft.
Mon night..NE winds 5 to 10 kt. Waves 1 ft.
Tue..SE winds 5 kt. Waves less than 1 ft.
Wed..S winds 5 to 10 kt. Waves 1 ft. A chance of showers. Winds and waves higher and visibilities lower in and near tstms.
ANZ500 1032 Pm Edt Fri Jun 22 2018
Synopsis for the tidal potomac and md portion of the chesapeake bay.. A warm front will slowly move northward through Saturday. Meanwhile, low pressure over the ohio valley will move into the eastern great lakes. This low will then move eastward across new england Sunday bringing a cold front across the waters. High pressure will return Monday and Tuesday.

7 Day Forecast for Marine Location Near Olney, MD
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location: 39.15, -77.07     debug


Area Discussion for - Baltimore, MD/Washington
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Fxus61 klwx 230156
afdlwx
area forecast discussion
national weather service baltimore md washington dc
956 pm edt Fri jun 22 2018

Synopsis
A warm front will slowly approach the region tonight before
passing through Saturday. Low pressure will move into the
great lakes during this time, and the cold front associated
with the low will approach Sunday before passing through
Sunday night. High pressure will return for Monday and Tuesday
before moving offshore during the middle portion of next week.

Near term through Saturday
A surface boundary bisects central virginia this afternoon with
a moist east northeast flow from the atlantic to the north of
said boundary. The area of rain that plagued locations along and
east of the blue ridge this morning has waned a bit as it
entered a more stable airmass to the north. Temperatures have
held pretty steady thanks to the cloud cover and rain coverage,
ranging in the middle 60s to near 70 degrees area wide.

The aforementioned boundary will start lifting northward
overnight, but it will be slow, so have added drizzle for the
overnight and morning hours Saturday. Showers and thunderstorms
will continue to develop and press northeastward overnight.

Areas that have experienced heavy rain over the last 24 hours
are poised to see additional rainfall overnight. As such, we
have maintained a flash flood watch until late tonight for
portions of central and northern virginia, and southern portions
of eastern west virginia.

Given that the boundary has remained south, the potential for
strong storms has diminished, and we no longer expect severe
weather across our CWA overnight.

High res guidance indicates a downward trend in precipitation
coverage after midnight, as activity moves off to the east
northeast, though some additional activity could redevelop.

Overnight lows will remain in the 60s for most.

Short term Saturday night through Sunday night
The front will lift north of the potomac river Saturday
morning and should clear maryland later in the day. This will
provide a warm and unstable airmass over the cwa. At the same
time an upper level low will be rounding the lower great lakes
with vorticity advection passing overhead. This combined with
the warm front ushering in a warm and moist airmass, scattered
showers and thunderstorms will develop mid morning onward. Given
the aforementioned set up and ingredients, some of these storms
could be strong.

The stalled boundary will reside nearby on Sunday, with the
warm and humid air mass sticking around as well. Additional
showers and storms will be possible during Sunday afternoon with
daytime heating. The flow aloft will favor more of a westerly
trajectory as opposed to Saturday, with not as much favorable
lift aloft. The stalled boundary looks to translate to a cold
front and move through the region later on Sunday, helping bring
a bit more stable environment to the region Sunday night, as
well as drier conditions. With the threat for precipitation and
ample cloud cover, do not expect temperatures to stray too far
from normal or slightly above through the period.

Long term Monday through Friday
Canadian high pressure will build overhead for Monday through
Tuesday, bringing dry conditions along with sunshine and low
humidity. MAX temps will be in the lower to middle 80s for most
locations with min temps in the 50s and 60s.

The high will move offshore Wednesday through Friday and a west
to southwest flow will cause a warming trend in temperatures
along with a return of more humid conditions. The increased heat
and humidity may lead to a few showers and thunderstorms each
day, especially during the afternoon and evening hours.

Aviation 02z Saturday through Wednesday
Ifr to MVFR forecast through the overnight period with episodes
of lifr conditions possible as well. The terminals will see
additional showers and storms develop and approach from the west
southwest. The strongest activity and greatest impacts to
aviators will be at cho where better instability and higher
rainfall rates are expected to reside. Will maintain rain
chances at all terminals through much of the night before
tapering off after midnight from west to east. Expect
restrictions to remain overnight with ample moisture remaining
over the area. Have added drizzle in as well.

Gusty easterly breezes will slacken overnight, turning light
and southerly Saturday morning.VFR MVFR CIGS will hold on
during the day on Saturday. Additional showers and thunderstorms
will be possible through the remainder of the weekend, bringing
periods of sub-vfr conditions.

High pressure will bringVFR conditions Monday and Tuesday. The high
will move offshore Wednesday, and this may trigger a few showers and
thunderstorms, especially during the afternoon and evening
hours.

Marine
A frontal boundary south of the waters will remain stalled
overnight before lifting northward Saturday. Gusty easterly
winds ahead of the front have helped bring small craft advisory
conditions to the waters this evening, and this is expected to
persist into the overnight.

Winds are forecast to slacken towards Saturday morning
as the gradient weakens. Showers and storms may impact the
waters Saturday and Saturday night, potentially producing
locally gusty winds. Southerly channelling is looking more
likely Saturday afternoon over the middle bay, so have isued new
sca for this area period.

High pressure will build in behind a cold front Monday through
Tuesday. The high will move offshore Wednesday. A small craft
advisory may be needed for portions of the waters Monday and Monday
night... And again from the return southwest flow Wednesday.

Hydrology
Ongoing flood warnings are abound across central and northern
virginia this evening thanks to persistent moderate to heavy
rainfall overnight and early this morning. The heavier rain has
moved off to the north and east, but numerous road closures
remain across the affected areas. Heed any and all road closure
signs and do not venture in to any flooded areas.

While the earlier rains are moving out of the area to our north
and east, additional showers and thunderstorms are expected to
develop later this afternoon and into this evening across the
same areas that received the heaviest rainfall since yesterday.

As a result, a flash flood watch is in effect late this
afternoon through tonight for portions of central and northern
virginia, including portions of the shenandoah valley and
adjacent eastern west virginia counties. Additional rainfall
accumulations of one to two inches are expected across these
areas with localized higher amounts where stronger showers and
storms impact.

Tides coastal flooding
Water levels running one to two feet above astronomical normals
this afternoon. Easterly breezes will promote water levels
continuing to run at or just above this level through tonight.

Advisories have been expanded across much of the chesapeake
shoreline and remain for much of the tidal potomac. Many may
need extensions if the water levels do not start to decline on
Saturday morning. Winds becoming westerly early next week should
allow water levels to start falling.

Lwx watches warnings advisories
Dc... Coastal flood advisory until 8 am edt Saturday for dcz001.

Md... Coastal flood advisory until 3 pm edt Saturday for mdz016.

Coastal flood advisory until 3 am edt Saturday for mdz018.

Coastal flood advisory until 8 am edt Saturday for mdz014.

Coastal flood advisory until 2 pm edt Saturday for mdz017.

Coastal flood advisory from 1 am to 8 am edt Saturday for
mdz011.

Va... Flash flood watch until 6 am edt Saturday for vaz025-026-029-
036>040-050-051-055>057-502>504-507-508.

Coastal flood advisory until 3 pm edt Saturday for vaz057.

Coastal flood advisory until 8 am edt Saturday for vaz054.

Wv... Flash flood watch until 6 am edt Saturday for wvz505-506.

Marine... Small craft advisory until 3 am edt Saturday for anz530>534-
537>543.

Small craft advisory from noon Saturday to 3 am edt Sunday for
anz534-543.

Synopsis... Bkf
near term... Bkf rcm
short term... Bkf
long term... Bjl
aviation... Bjl bkf rcm
marine... Bjl bkf rcm
hydrology... Lwx
tides coastal flooding... Lwx


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
WASD2 - 8594900 - Washington, DC 19 mi44 min NNE 2.9 G 8 67°F 78°F1012.2 hPa (-0.0)
BLTM2 - 8574680 - Baltimore, MD 27 mi50 min E 7 G 11 66°F 77°F1012.7 hPa
FSNM2 29 mi50 min ENE 14 G 17 66°F 1012.9 hPa
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 29 mi44 min ENE 12 G 15 67°F 1012.8 hPa (+0.0)
BSLM2 - Chesapeake Bay, MD 32 mi134 min ENE 2.9 63°F 1012 hPa62°F
APAM2 - 8575512 - Annapolis, MD 33 mi44 min 67°F 1012 hPa (-0.3)
44063 - Annapolis 35 mi34 min E 16 G 18 68°F 1012.6 hPa
TPLM2 - Thomas Point, MD 38 mi44 min NE 12 G 16 67°F 75°F1013.1 hPa (+0.0)65°F
CPVM2 38 mi44 min 68°F 66°F
TCBM2 - 8573364 - Tolchester Beach, MD 44 mi44 min ENE 5.1 G 8.9 64°F 76°F1013.2 hPa (+0.3)

Wind History for Washington, DC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Gaithersburg - Montgomery County Airport, MD5 mi48 minVar 510.00 miOvercast64°F61°F90%1015.5 hPa
College Park Airport, MD14 mi67 minNE 410.00 miOvercast64°F61°F92%1012.2 hPa
Fort Meade / Tipton, MD16 mi68 minE 710.00 miOvercast63°F60°F94%1013.9 hPa
Washington/Reagan National Airport, DC, VA20 mi52 minNE 910.00 miOvercast68°F64°F87%1012.1 hPa
Baltimore, Baltimore-Washington International Airport, MD21 mi50 minENE 1210.00 miOvercast65°F62°F90%1012.8 hPa
Washington/Dulles International Airport, DC, VA24 mi52 minE 11 G 1810.00 miOvercast65°F64°F97%1011.5 hPa

Wind History from GAI (wind in knots)
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Last 24hrCalmCalmCalmE3E3Calm3443E5Calm4E556E8E7
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1 day agoCalmW3CalmCalmNW4W3CalmCalmCalmCalmNW5NW3CalmCalmCalm44Calm34CalmCalmCalm3
2 days agoCalmCalmCalmCalmCalmCalmCalmCalmCalmCalm3CalmCalmCalmCalmCalmCalmSE5S3SE5S3W8SW3W5

Tide / Current Tables for Chain Bridge, D.C.
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Chain Bridge
Click for Map
Fri -- 02:25 AM EDT     Moonset
Fri -- 04:44 AM EDT     3.35 feet High Tide
Fri -- 05:43 AM EDT     Sunrise
Fri -- 11:32 AM EDT     0.28 feet Low Tide
Fri -- 03:26 PM EDT     Moonrise
Fri -- 05:11 PM EDT     3.01 feet High Tide
Fri -- 08:37 PM EDT     Sunset
Fri -- 11:43 PM EDT     0.22 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.51.32.22.83.23.332.51.91.30.80.40.30.81.62.32.832.92.41.81.20.70.3

Tide / Current Tables for Chain Bridge, Washington, D.C.
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Chain Bridge
Click for Map
Fri -- 02:25 AM EDT     Moonset
Fri -- 04:48 AM EDT     3.36 feet High Tide
Fri -- 05:43 AM EDT     Sunrise
Fri -- 11:34 AM EDT     0.24 feet Low Tide
Fri -- 03:26 PM EDT     Moonrise
Fri -- 05:14 PM EDT     3.03 feet High Tide
Fri -- 08:37 PM EDT     Sunset
Fri -- 11:45 PM EDT     0.17 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.51.22.12.83.23.33.12.51.91.30.80.30.30.81.52.22.832.92.41.81.20.70.3

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.
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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Baltimore, MD/Washington (22,6,7,8)
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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.