Thursday, July19, 2018 L-36.com


Marine Weather and Tides
Upper Marlboro, 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 5:57AMSunset 8:30PM Thursday July 19, 2018 1:42 PM EDT (17:42 UTC) Moonrise 12:17PMMoonset 11:58PM Illumination 42% Phase: First Quarter Moon; Moon at 7 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
    EDIT      (on/off)   Help
ANZ532 Chesapeake Bay From Sandy Point To North Beach- 131 Pm Edt Thu Jul 19 2018
This afternoon..NE winds 5 kt. Waves less than 1 ft.
Tonight..SE winds 5 to 10 kt. Waves 1 ft.
Fri..SE winds 5 to 10 kt. Waves 1 ft.
Fri night..SE winds 10 kt. Waves 2 ft.
Sat..E winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft. A chance of showers and tstms.
Sat night..NE winds 10 to 15 kt...becoming E 5 kt after midnight. Waves 1 to 2 ft. A chance of showers.
Sun..SE winds 5 to 10 kt. Waves 1 ft. Showers likely.
Mon..S winds 10 kt. Waves 1 to 2 ft. Showers likely . Winds and waves higher and visibilities lower in and near tstms.
ANZ500 131 Pm Edt Thu Jul 19 2018
Synopsis for the tidal potomac and md portion of the chesapeake bay.. Canadian high pressure will prevail through tonight before relocating off the new england coast Friday. A weak area of low pressure may move near the delmarva coastline Saturday before another low approaches from the west on Sunday. Small craft advisories may be required Saturday and Sunday.

7 Day Forecast for Marine Location Near Upper Marlboro, MD
   Hourly   EDIT   Help
location: 38.8, -76.72     debug


Area Discussion for - Baltimore, MD/Washington
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
Fxus61 klwx 191420
afdlwx
area forecast discussion
national weather service baltimore md washington dc
1020 am edt Thu jul 19 2018

Synopsis
High pressure over new york will move to new england by Friday.

Developing low pressure in the midwest will approach the area
this weekend.

Near term through tonight
Only minor tweaks required to the forecast this morning to
capture latest trends in sky wind temperature. Satellite shows
morning stratocumulus dissipating with patches of cirrus
stretching from the ohio valley to central virginia. These
clouds are gradually spreading north, but they won't be enough
to completely obscure the sun.

The ridge of high pressure will remain centered north of the
area today and tonight. Temperatures will climb into the middle
to upper 80s by this afternoon. Dry conditions will continue
through tonight as lows drop back into the 60s.

Short term Friday through Saturday night
High pressure will slowly move toward new england Friday and
then offshore later in the day into Friday night. Some diurnal
cumulus clouds could develop Friday with developing warm
advection. There shouldn't be much of a shower influence Friday.

Most, of any, showers that do develop would be Friday night and
across parts of the potomac highlands.

By Saturday, a strong upper level trough will extend from the
great lakes southward across the ohio and tennessee river
valleys. This trough will interact with a stalled front off the
southeast coast, developing a surface low along the coast. The
gfs and euro both depict this storm moving along the east coast
Saturday and Saturday night. Both models tend to keep this
system far enough east to avoid any direct impacts. These two
features will act together to provide plenty of moisture and
lift across the area for a chance at some showers and
thunderstorms. This chance appears to be higher late Saturday,
as a warm front lifts northward across the region. With
unsettled weather expected much of the day, expecting temps to
be below average, with highs in the upper 70s to low 80s.

Long term Sunday through Wednesday
An upper level and surface low will be stacked near the ohio valley
Sunday morning as a surface warm front is progged to be lifting
northward into our area. On the eastern periphery of the
aforementioned trough and associated mid level energy, expecting
increased shower and thunderstorm chances during the day on Sunday,
and continuing into Monday as the trough and surface boundary
lingers nearby. The upper level trough should go on a weakening
trend late Monday drifting southward into the southeast u.S.

Precipitable water values will remain elevated (1.75-2.00") during
this period as much of the region will reside in the moist sector
under a southerly flow, and dewpoints will range in the upper 60s to
low 70s much of the time.

A surface cold front and another digging upper level trough across
the great lakes will be approaching to our west Tuesday and
Wednesday, bringing an additional plume of moisture across the area.

Will continue to advertise high end chance to likely pops through
midweek as a result. Temperatures through the extended period will
run below normal for highs and near or slightly above normal for
overnight lows thanks to ample cloud cover and elevated rain
chances.

Aviation 14z Thursday through Monday
Vfr conditions will prevail today with high pressure north of
the area. Mainly cirrus clouds are expected, with a light east
to southeast surface wind.

Terminals will begin experiencing a return flow Friday. Showers
should hold off in the mountains during the afternoon, but may
spread east to cho mrb in the evening. Instability looks
minimal, so am not forecasting thunder at this time.

Unsettled weather returns this weekend as an upper level trough
nears from the west and a surface warm front lifts northward toward
the terminals Saturday night. Expect increasing rain chances
during this time period which will promote periods of subVFR
conditions.

Periodic subVFR conditions expected the latter half of the weekend
and into early next week as an upper level trough hovers nearby.

This trough and associated mid level energy will be responsible for
sparking showers and thunderstorms each day, with the stronger
convective activity favoring the afternoon and evening hours. Expect
south southeasterly winds at 10 knots or less through the period,
with erratic and strong gusty winds in and around thunderstorms.

Marine
Early morning channeling mixing of winds has decreased, with
northeast winds becoming east later today at 5-10 kt. Winds may
be near 15 kt on the open waters again tonight, but don't think
an SCA will be warranted given high pressure nearby. Winds will
become southeast on Friday, and could approach SCA criteria late
in the day and overnight. The mid-bay has the best chance at
stronger winds as low pressure approaches from the southeast.

Sca conditions plausible Saturday and Saturday night as an
upper level trough nears from the west, delivering showers and
thunderstorms across the region. Any thunderstorms will be
capable of producing locally gusty winds which may require the
need for special marine warnings should conditions warrant.

Low end SCA conditions are conceivable Sunday and into early next
week as a warm front lifts through the waters on Sunday and stalls
nearby. South southeasterly breezes will persist over the waters
through Tuesday. With an upper level trough and surface boundary
lurking nearby, expecting decent coverage of showers and storms
through Tuesday, yielding the threat of locally gusty winds in and
around thunderstorm activity. Special marine warnings may be
required should conditions warrant.

Lwx watches warnings advisories
Dc... None.

Md... None.

Va... None.

Wv... None.

Marine... None.

Synopsis... Klw
near term... Ads klw
short term... Klw
long term... Bkf
aviation... Ads bkf klw
marine... Ads bkf klw


Weather Reporting Stations
   EDIT       (on/off)   Help   NOTE: Click on distance to see the station location on a map
Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
BSLM2 - Chesapeake Bay, MD 1 mi133 min ENE 4.1 77°F 1020 hPa53°F
TPLM2 - Thomas Point, MD 17 mi43 min N 5.1 G 6 76°F 80°F1020.5 hPa (+0.0)57°F
WASD2 - 8594900 - Washington, DC 17 mi43 min SSW 4.1 G 7 82°F 83°F1019.2 hPa (-0.3)
APAM2 - 8575512 - Annapolis, MD 18 mi43 min 80°F 1019.1 hPa (+0.0)
44063 - Annapolis 19 mi43 min E 3.9 G 5.8 78°F 81°F1 ft1019.9 hPa (+0.0)
CPVM2 22 mi43 min 78°F 56°F
44062 - Gooses Reef, MD 23 mi43 min N 5.8 G 7.8 79°F 1 ft1019.8 hPa (+0.0)
FSNM2 31 mi43 min SSE 6 G 8 77°F 1019.2 hPa (+0.0)
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 31 mi43 min SE 6 G 8 77°F 1019.2 hPa (+0.0)
BLTM2 - 8574680 - Baltimore, MD 33 mi43 min S 2.9 G 7 81°F 82°F1018.8 hPa (-0.4)
COVM2 - 8577018 - Cove Point LNG Pier, MD 33 mi43 min N 7 G 8.9 78°F 1019.8 hPa (+0.0)
SLIM2 - 8577330 - Solomons Island, MD 36 mi43 min ESE 4.1 G 5.1 79°F 82°F1018.9 hPa (+0.0)
NCDV2 37 mi43 min SSE 2.9 G 5.1 81°F 81°F1018.5 hPa (+0.0)
TCBM2 - 8573364 - Tolchester Beach, MD 38 mi43 min N 5.1 G 7 78°F 81°F1019.5 hPa (+0.0)
CA2 - 8571892 - Cambridge, MD 38 mi43 min 83°F 84°F1020.1 hPa (+0.0)

Wind History for Washington, DC
(wind in knots)    EDIT      (on/off)   Help
2
PM
3
PM
4
PM
5
PM
6
PM
7
PM
8
PM
9
PM
10
PM
11
PM
12
AM
1
AM
2
AM
3
AM
4
AM
5
AM
6
AM
7
AM
8
AM
9
AM
10
AM
11
AM
12
PM
1
PM
Last
24hr
N6
G16
NW9
G15
N5
G8
N6
G12
N4
G10
N5
G9
NW4
G7
NW4
NW3
G6
NW1
NW2
NW3
W1
NW1
NW1
NE3
G7
N4
G7
NE3
G7
N4
NE4
G7
E3
NE3
G6
W2
G5
SW4
G7
1 day
ago
S10
SW2
G5
SW4
W2
NW5
G8
W3
W2
--
N11
G20
NW4
NW5
G9
NW6
G9
NW6
G11
NW9
NW6
G11
NW5
G9
NW8
G12
NW9
G15
NW4
G8
N4
G13
N4
G11
N7
G11
N6
G15
NW8
2 days
ago
S8
G11
S11
G16
S10
G13
W9
G16
S4
SE3
S3
G6
SW4
G7
S6
S5
S6
S6
G9
S6
G9
S7
S8
G11
S6
G9
S6
S4
S5
G9
S5
G8
S7
G10
S6
S7
S7
G11

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Camp Springs / Andrews Air Force Base, MD8 mi1.8 hrsESE 510.00 miFair81°F52°F37%1020.1 hPa
College Park Airport, MD16 mi66 minWSW 310.00 miFair83°F53°F36%1019.3 hPa
Washington/Reagan National Airport, DC, VA17 mi51 minS 410.00 miMostly Cloudy84°F55°F38%1019.4 hPa
Annapolis, United States Naval Academy, MD18 mi49 minE 610.00 miFair83°F54°F37%1019.5 hPa
Fort Meade / Tipton, MD20 mi67 minN 010.00 miFair82°F55°F40%1020.3 hPa
Bay Bridge Field, MD24 mi68 minNW 710.00 miFair79°F59°F51%1019.6 hPa

Wind History from ADW (wind in knots)
2
PM
3
PM
4
PM
5
PM
6
PM
7
PM
8
PM
9
PM
10
PM
11
PM
12
AM
1
AM
2
AM
3
AM
4
AM
5
AM
6
AM
7
AM
8
AM
9
AM
10
AM
11
AM
12
PM
1
PM
Last 24hrN10N4
G15
N10
G14
N13NW7
G16
NW13N8N5N6N4N5N4N4N3N4N3NE6N4N6NE7E5NE6SE5S5
1 day agoS6SW9NW17
G28
CalmCalmSE3S3CalmNW4N12W5NW6NW8NW10NW11
G17
NW8NW9NW10NW9N10N9N8NW13NW8
2 days agoCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmSW9SW8SW8SW6W10SW9

Tide / Current Tables for Hills Bridge (Route 4), Patuxent River, Maryland
   EDIT   RT Ports Option   Weekend mode (on/off)   (on/off)   Help   One Week of Data
Hills Bridge (Route 4)
Click for Map
Thu -- 12:26 AM EDT     Moonset
Thu -- 05:57 AM EDT     Sunrise
Thu -- 06:33 AM EDT     1.33 feet Low Tide
Thu -- 11:25 AM EDT     3.35 feet High Tide
Thu -- 01:17 PM EDT     Moonrise
Thu -- 03:53 PM EDT     First Quarter
Thu -- 06:38 PM EDT     0.69 feet Low Tide
Thu -- 08:28 PM EDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
3.63.32.92.521.61.41.41.72.32.93.33.332.521.510.70.71.11.82.63.3

Tide / Current Tables for Baltimore Harbor Approach, Maryland Current
   EDIT      (on/off)   Help   One Week of Data
Baltimore Harbor Approach
Click for Map
Thu -- 12:24 AM EDT     Moonset
Thu -- 02:16 AM EDT     -0.00 knots Slack
Thu -- 05:09 AM EDT     -0.72 knots Max Ebb
Thu -- 05:55 AM EDT     Sunrise
Thu -- 08:12 AM EDT     0.00 knots Slack
Thu -- 11:04 AM EDT     0.65 knots Max Flood
Thu -- 01:15 PM EDT     Moonrise
Thu -- 01:51 PM EDT     -0.00 knots Slack
Thu -- 03:53 PM EDT     First Quarter
Thu -- 05:13 PM EDT     -0.89 knots Max Ebb
Thu -- 08:24 PM EDT     0.00 knots Slack
Thu -- 08:27 PM EDT     Sunset
Thu -- 11:48 PM EDT     1.00 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.80.50.1-0.3-0.6-0.7-0.6-0.4-0.10.30.50.60.60.3-0.1-0.4-0.7-0.9-0.8-0.6-0.20.30.70.9

Weather Map and Satellite Images
       (on/off)   HelpWeather Map
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.
target = "new">Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Baltimore, MD/Washington (13,3,4,5)
      (on/off)   Help

Ground Weather Radar Station Sterling, VA
   (on/off)   Help
weather_mapweather_map weather_map

Ad by Google

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.