Monday, June25, 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 5:42AMSunset 8:40PM Monday June 25, 2018 3:34 AM EDT (07:34 UTC) Moonrise 5:25PMMoonset 3:03AM Illumination 90% Phase: Waxing Gibbous; Moon at 12 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- 131 Am Edt Mon Jun 25 2018
Overnight..NW winds 5 to 10 kt. Waves 1 ft.
Mon..N winds 10 kt. Waves 1 ft.
Mon night..NE winds 5 to 10 kt. Waves 1 ft.
Tue..E winds 5 to 10 kt. Waves 1 ft.
Tue night..SE winds 5 to 10 kt. Waves 1 ft.
Wed..S winds 5 to 10 kt. Waves 1 ft. A chance of showers and tstms.
Wed night..S winds 5 to 10 kt. Waves 1 ft. A chance of showers.
Thu..NW winds around 5 kt. Waves 1 ft. A chance of showers.
Fri..W winds around 5 kt. Waves 1 ft or less. Winds and waves higher and visibilities lower in and near tstms.
ANZ500 131 Am Edt Mon Jun 25 2018
Synopsis for the tidal potomac and md portion of the chesapeake bay.. A cold front will cross our region tonight. High pressure will build over us Monday into Tuesday. A low pressure system moving across the great lakes will bring a warm front Wednesday followed by a cold front Thursday. High pressure will build behind the front by the end of the week and into the weekend.

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 250134
afdlwx
area forecast discussion
national weather service baltimore md washington dc
934 pm edt Sun jun 24 2018

Synopsis
A cold front is crossing our region tonight. High pressure will
build over us Monday into Tuesday. A low pressure system moving
across the great lakes will bring a warm front Wednesday
followed by a cold front Thursday. High pressure will build
behind the front by the end of the week and into the weekend.

Near term through Monday
Last showers are passing southeast and will likely clear the
region by midnight. With loss of insolation, no further severe
weather is expected, but brief heavy downpours are still
possible. As the front clears the region overnight, dew points
should drop, but some patchy fog could still develop in
sheltered locales. Otherwise, it likely turns out mostly clear
late with lows mostly in the 60s.

Short term Monday night through Tuesday night
Canadian high pressure will build from the north on Monday
allowing for northwesterly flow and lower dew points over our
area. High temperatures will be in the low to mid 80s on Monday,
and low 80s on Tuesday, meanwhile high temperatures will reach
the 70s at higher elevations.

High pressure will remain in control on Tuesday and will be
centered off of the new england coast on Tuesday. Flow will
become easterly to southeasterly. Upper level energy may enhance
some showers but guidance is suggesting it will be more in the
overnight hours.

Long term Wednesday through Sunday
A weakening surface low will be moving along the us canada border
throughout the day on Wednesday. At the same time, a surface high
pressure will be shifting off the east coast. Southerly flow will
push the warm front associated with the aforementioned low through
through the region on Wednesday morning. This, along with the
formation of a lee surface trough, should result in scattered
showers and thunderstorms in the afternoon, with the best chances
occurring in northern md and northern va. Given 30-40 kt flow at the
mid levels, some storms could be accompanied by gusty winds.

However, given the residual cloud cover from the warm frontal
passage in the morning, the amount of instability available will be
in question by the afternoon. With the southerly flow out ahead of
the cold front, temperatures will begin to increase, with max
temperatures into the mid 80s.

The surface low departs to the northeast early on Thursday, which
will drag a cold front through the region. This will bring another
chance for some pop up showers and storms Thursday afternoon,
especially given MAX temperatures in the low to mid 90s and dew
points in the low 70s. Forcing seems to be relatively weak with the
frontal passage, but enough instability should exist for at least
some scattered development.

A strong upper level ridge looks to move into the area on Friday
through the weekend, bringing dry conditions back to the region.

High temperatures will be very warm, with MAX temperatures expected
to be in the mid 90s.

Aviation 02z Monday through Friday
Last showers pushing southeast with no further severe weather
expected. Brief reduction possible at dca momentarily, otherwise
generallyVFR rest of tonight. Cold front crossing the region
should lower dew points later tonight, but some lingering
moisture and winds diminishing late could allow patchy fog
nevertheless. A high pressure will build over us on Monday and
remain in control through Tuesday allowing for mainlyVFR
condtions.

SubVFR ceilings are possible on Wednesday morning with the passage
of a warm front. Later in the afternoon, scattered thunderstorms
should develop across the region, bringing another chance for some
sub-vfr conditions. Thursday will be very similar, as a weak cold
front moves through the region.

Marine
Lingering showers may produce a brief gust to 25 knots rest of
this evening, but otherwise winds should generally stay below 18
knots next few days. Gradient is a bit elevated on Monday behidn
the front so we may be very close to sca, however, so will need
to keep an eye on it. The pressure gradient will weaken Monday
night into Tuesday as high pressure builds over the area,
therefore not anticipating any small craft advisory during this
time.

Sca criteria winds will be possible on Wednesday, given a strong
gradient across the region, and southerly flow. Scattered showers
and thunderstorms on Wednesday and isolated showers and storms
Thursday afternoon could result in additional gusty winds on the
waters.

Tides coastal flooding
Anomalies should continue to decrease on westerly to northwesterly
flow through Tuesday. Minor flooding is still possible through
Monday morning on the upper tidal potomac shoreline due to some
added freshwater input, but overall the tidal flood threat should be
very low.

Onshore flow will cause anomalies to increase again during the
middle of the week in tandem with a full moon (Thursday), resulting
in a renewed potential of more widespread (minor) tidal
flooding.

Lwx watches warnings advisories
Dc... None.

Md... None.

Va... None.

Wv... None.

Marine... None.

Synopsis... Imr
near term... Imr
short term... Imr
long term... Cjl
aviation... Imr cjl
marine... Imr cjl
tides coastal flooding... Lwx


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
WASD2 - 8594900 - Washington, DC 19 mi46 min Calm G 1 73°F 76°F1013.3 hPa
BLTM2 - 8574680 - Baltimore, MD 27 mi52 min N 2.9 G 4.1 73°F 76°F1012.6 hPa
FSNM2 29 mi58 min WNW 8.9 G 11 73°F 1012.7 hPa
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 29 mi46 min WNW 6 G 8 72°F 1012.7 hPa
BSLM2 - Chesapeake Bay, MD 32 mi124 min W 1 63°F 1013 hPa62°F
APAM2 - 8575512 - Annapolis, MD 33 mi52 min 72°F 1012.5 hPa
44063 - Annapolis 35 mi34 min WNW 7.8 G 7.8 74°F 76°F1013.1 hPa (-0.2)
TPLM2 - Thomas Point, MD 38 mi34 min W 7 G 7 73°F 75°F1013.6 hPa (+0.0)72°F
CPVM2 38 mi46 min 74°F 74°F
TCBM2 - 8573364 - Tolchester Beach, MD 44 mi46 min WNW 5.1 G 7 75°F 77°F1012.9 hPa

Wind History for Washington, DC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Gaithersburg - Montgomery County Airport, MD5 mi38 minWNW 510.00 miFair66°F64°F93%1016.5 hPa
College Park Airport, MD14 mi57 minN 05.00 miFair68°F67°F98%1013.2 hPa
Fort Meade / Tipton, MD16 mi58 minN 03.00 miFair64°F62°F94%1013.9 hPa
Washington/Reagan National Airport, DC, VA20 mi42 minS 59.00 miMostly Cloudy72°F69°F91%1013.5 hPa
Baltimore, Baltimore-Washington International Airport, MD21 mi40 minW 49.00 miMostly Cloudy68°F66°F96%1012.7 hPa
Washington/Dulles International Airport, DC, VA24 mi42 minNW 510.00 miMostly Cloudy69°F66°F93%1013.7 hPa

Wind History from GAI (wind in knots)
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Last 24hrCalmCalm--CalmCalmW5W7NW6W6W6W6W5W95SW8SW6CalmCalmCalmCalmCalmCalmCalmW5
1 day agoCalmCalmCalmCalmCalmCalmCalmCalmCalmSE5SE34S4S3SW4S5S6S5W3CalmCalmCalmCalmCalm
2 days agoCalm3443E5Calm4E556E8E7
G18
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G15
E86E86533CalmCalmCalm

Tide / Current Tables for Chain Bridge, D.C.
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Chain Bridge
Click for Map
Mon -- 01:26 AM EDT     0.30 feet Low Tide
Mon -- 04:03 AM EDT     Moonset
Mon -- 05:44 AM EDT     Sunrise
Mon -- 07:22 AM EDT     3.47 feet High Tide
Mon -- 02:19 PM EDT     0.18 feet Low Tide
Mon -- 06:24 PM EDT     Moonrise
Mon -- 07:53 PM EDT     2.95 feet High Tide
Mon -- 08:37 PM EDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.60.30.40.91.72.53.13.43.42.92.31.71.20.60.20.30.91.62.32.82.92.72.11.5

Tide / Current Tables for Chain Bridge, Washington, D.C.
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Chain Bridge
Click for Map
Mon -- 01:26 AM EDT     0.24 feet Low Tide
Mon -- 04:03 AM EDT     Moonset
Mon -- 05:44 AM EDT     Sunrise
Mon -- 07:23 AM EDT     3.49 feet High Tide
Mon -- 02:18 PM EDT     0.12 feet Low Tide
Mon -- 06:24 PM EDT     Moonrise
Mon -- 07:54 PM EDT     2.98 feet High Tide
Mon -- 08:37 PM EDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.60.30.30.81.72.53.13.53.432.31.71.10.60.20.30.81.62.32.832.72.11.5

Weather Map and Satellite Images
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wmap_A
GOES Local Image of Mid-Atlantic    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.
target = "new">Link to Loop



Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Baltimore, MD/Washington (3,6,7,8)
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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.