Monday, October14, 2019 L-36.com


Marine Weather and Tides
Washington, DC

Version 3.4
NOTICE
10/9/2019 Updated the Marine Zones.
9/4/2019 Fixed the weather maps due to NOAA moving them.
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.
6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

Sunrise 7:15AMSunset 6:33PM Monday October 14, 2019 6:57 AM EDT (10:57 UTC) Moonrise 6:20PMMoonset 6:46AM Illumination 99% Phase: Full Moon; Moon at 15 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
ANZ535 Tidal Potomac From Key Bridge To Indian Head- 500 Am Edt Mon Oct 14 2019
Rest of the overnight..W winds 5 kt. Waves flat.
Today..W winds around 5 kt. Waves 1 ft.
Tonight..N winds around 5 kt. Waves 1 ft.
Tue..SE winds around 5 kt. Waves 1 ft.
Tue night..SE winds 5 kt. Waves less than 1 ft.
Wed..S winds 5 kt. Waves less than 1 ft. Showers.
Wed night..W winds 10 kt with gusts to 20 kt. Waves 1 ft.
Thu..NW winds 10 to 15 kt. Waves 1 ft.
Fri..W winds around 5 kt. Waves 1 ft or less.
ANZ500 500 Am Edt Mon Oct 14 2019
Synopsis for the tidal potomac and md portion of the chesapeake bay.. High pressure will build from the tennessee valley toward new england through Tuesday while a secondary cold front approaches from the great lakes and weakens. A strong area of low pressure will move across the ohio valley Wednesday, then re-develop over southeastern virginia and move up the coast toward new england Wednesday night into Thursday. Small craft advisories may be needed Wednesday through Thursday, with gales possible Wednesday night into Thursday.


7 Day Forecast for Marine Location Near Washington, DC
   Hourly   EDIT   Help
location: 38.89, -77.03     debug


Area Discussion for - Baltimore, MD/Washington
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
Fxus61 klwx 140804
afdlwx
area forecast discussion
national weather service baltimore md washington dc
404 am edt Mon oct 14 2019

Synopsis
High pressure will build from the tennessee valley toward new
england through Tuesday while a secondary cold front approaches from
the great lakes and weakens. A strong area of low pressure will move
across the ohio valley Wednesday, then re-develop over southeastern
virginia and move up the coast toward new england Wednesday night
into Thursday. High pressure will follow Friday into the weekend.

Near term through tonight
Main concern early this morning is patchy dense fog. Sfc obs and
nighttime microphysics rgb show dense fog has developed across
parts of the area this morning with vsbys as low as quarter of
an mile in a few spots. Right now, it is patchy and not
widespread enough to issue an advisory, but will continue to
monitor. Otherwise, mostly clear today with high temperatures in
the middle 70s. Clear and cool tonight as high pressure builds
in.

Short term Tuesday through Wednesday night
Tranquil on Tue as high pressure dominates. High moves offshore
tue night with increasing clouds and showers developing late.

Model guidance has trended slower with onset of precip Tue night
this cycle and have confined pops mainly after 06z wed. Global
models during the past few days have been trending stronger with
a southern stream low pressure center fcst to move across the
area Wed afternoon showing it to be the more dominant weather
system. As a result, expect some beneficial rains late Tue night
through Wed afternoon with quarter to half inch of rain. Eps
95th percentile shows up to 1.5 inches of rain along the i-95
corridor. Expect a convective line to race through the area wed
afternoon with frontal passage and gusty NW behind it. Upslope
rain showers will continue over the appalachians into thu
morning in NW flow.

Long term Thursday through Sunday
In the wake of the aforementioned cold front, a windy day is
expected on Thursday. Sustained winds of 10-15 mph, with gusts up to
25 mph are expected, especially in the late morning early afternoon.

Additionally, the front will be bringing in the coolest air mass of
the season thus far, with highs in the upper 50s to low 60s. Other
than some upslope showers along west of the allegheny front Thursday
morning, thinking we stay dry and mostly sunny. Overnight lows on
Thursday will be in the upper 30s to low 40s, with some even some
temperatures near freezing at the highest elevations.

High pressure will settle overhead on Friday, resulting in sunny
skies and seasonable temperatures, with highs in the low 60s. Clear
on Friday night with overnight lows into the low 40s. High pressure
will then shift offshore by Saturday, warming temperatures into the
mid to upper 60s. Again, expecting a dry and mostly sunny day.

Overnight lows on Saturday night will be warmer, into the upper 40s
to low 50s, thanks to the southerly return flow. Sunday again looks
dry at this time, with high pressure settled offshore. Temperatures
will be even a little warmer, with highs into the low to mid 70s.

Aviation 08z Monday through Friday
Patchy dense fog across the region this morning. Will continue
to monitor. Otherwise,VFR conditions through Tue evening with
potential for MVFR CIGS late Tue night and Wed in rain as cold
front crosses the area. Gusty NW winds behind FROPA late wed
into Wed night.

Vfr conditions expected Thursday and Friday behind a cold frontal
passage, with high pressure building into the region. Main concern
will be gusty west-northwesterly winds up to 20 knots or so.

Less windy on Friday, with continuedVFR conditions expected.

Marine
Winds begin to increase Wed afternoon and smws may be required
with convective line along cold front. Solid SCA conditions
expected Wed night in post-frontal NW flow regime.

In the wake of a passing cold front, small craft advisories are
likely going to be needed all day Thursday through much of the day
on Friday. Gale force winds are even a possibility early in the day
on Thursday. Winds will begin to taper off Friday afternoon.

Tides coastal flooding
Cf.Y remains in effect for annapolis as it looks like there is
still a low chance of reaching minor flooding with next high
tide, although my forecast keeps it just below. Will monitor
and cancel early if it doesn't look like it won't reach the
threshold.

Lwx watches warnings advisories
Dc... None.

Md... Coastal flood advisory until 8 am edt this morning for mdz014.

Va... None.

Wv... None.

Marine... None.

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


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
WASD2 - 8594900 - Washington, DC 1 mi64 min WNW 4.1 G 7 55°F 69°F1015.5 hPa
BSLM2 - Chesapeake Bay, MD 19 mi148 min Calm 51°F 1015 hPa51°F
APAM2 - 8575512 - Annapolis, MD 30 mi64 min 56°F 1014.5 hPa
44063 - Annapolis 31 mi46 min NW 3.9 G 3.9 57°F 66°F1015 hPa
TPLM2 - Thomas Point, MD 31 mi58 min W 1.9 G 2.9 57°F 67°F1016 hPa (+0.0)57°F
BLTM2 - 8574680 - Baltimore, MD 35 mi64 min N 2.9 G 4.1 56°F 71°F1014.8 hPa
CPVM2 35 mi64 min 59°F
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 35 mi64 min W 2.9 G 4.1 58°F 1015 hPa
FSNM2 35 mi64 min W 5.1 G 6 57°F 1015.1 hPa
NCDV2 39 mi64 min NNW 1.9 G 1.9 57°F 1014.1 hPa
44062 - Gooses Reef, MD 40 mi46 min N 5.8 G 7.8 62°F 1015.7 hPa
TCBM2 - 8573364 - Tolchester Beach, MD 47 mi64 min E 2.9 G 2.9 54°F 66°F1015.1 hPa

Wind History for Washington, DC
(wind in knots)    EDIT      (on/off)   Help
7
AM
8
AM
9
AM
10
AM
11
AM
12
PM
1
PM
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
Last
24hr
N2
E2
G8
NE5
G10
NE3
G7
SE3
G6
SE4
G7
E1
SW2
SE2
G6
SE3
E3
E1
G4
E1
G5
SE3
--
SE2
--
--
NE2
--
--
--
NW1
NW5
1 day
ago
N1
SE2
E1
S1
SW4
S6
SE4
S5
W4
NW6
G9
N3
G9
NW5
G8
NW4
G10
N3
NW2
NW4
N3
G10
NW6
G9
NW6
G11
NW3
G6
N3
G8
NE4
N4
G7
N2
G6
2 days
ago
N6
G9
N8
G11
N8
G11
N4
N5
G9
NW4
G9
N2
G12
NW8
G11
N5
G11
N8
G11
NW5
G10
NW4
G11
N4
G7
NE4
NE1
G4
E2
--
NE1
SW1
W1
--
--
--
--

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports. Follow links for more data.
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Washington/Reagan National Airport, DC, VA2 mi66 minN 010.00 miA Few Clouds54°F51°F90%1015.5 hPa
Camp Springs / Andrews Air Force Base, MD9 mi62 minN 03.00 miFog/Mist45°F44°F99%1015.6 hPa
College Park Airport, MD9 mi75 minN 010.00 miFair47°F44°F93%1015.2 hPa
Fort Belvoir, VA14 mi62 minN 06.00 miFog/Mist48°F46°F95%1015.5 hPa
Fort Meade / Tipton, MD20 mi76 minN 010.00 miFair45°F42°F93%1015.9 hPa
Gaithersburg - Montgomery County Airport, MD21 mi62 minN 010.00 miFair44°F43°F96%1017.1 hPa
Washington/Dulles International Airport, DC, VA23 mi66 minNW 310.00 miFair44°F41°F89%1015.5 hPa

Link to 5 minute data for KDCA

Wind History from DCA (wind in knots)
7
AM
8
AM
9
AM
10
AM
11
AM
12
PM
1
PM
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
Last 24hrN9NE10NE9NE7NE7534CalmSE5E6NE6E3NE4NE3E3CalmCalmCalmCalmCalmW3CalmCalm
1 day agoNE4E3CalmCalmS7S7S5S6NW5NW11NW6NW6N9N5N5NW6N9N9NW9N8N9N8NE9NE10
2 days agoN10N10NE12
G18
N10N6N9N7N7
G16
N12N9N8N10N10N7E4E6CalmCalmE3CalmCalmN3NE43

Tide / Current Tables for Washington, Potomac River, D.C.
   EDIT   Weekend mode (on/off)   (on/off)   Help   One Week of Data
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.


Tide / Current Tables for Bladensburg, Anacostia River, Maryland
   EDIT      (on/off)   Help   One Week of Data
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.


Weather Map
       (on/off)   Help Weather Map
wmap_A
GEOS 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.
Link to Loop



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