Saturday, November17, 2018 L-36.com


Marine Weather and Tides
Greenbriar, VA

Version 3.4
What's New / NOTES
10/6/2018 Colors of tide XTide graphs changed to emphasize that they were upgraded. See next note. Comments welcome.
10/4/2018 I have fixed XTide and updated the harmonic files. There were some name changes so you might have to click EDIT to find the new station name.

Sunrise 6:54AMSunset 4:55PM Saturday November 17, 2018 11:00 PM EST (04:00 UTC) Moonrise 2:15PMMoonset 12:52AM Illumination 76% 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
    EDIT      (on/off)   Help
ANZ535 Tidal Potomac From Key Bridge To Indian Head- 936 Pm Est Sat Nov 17 2018
Rest of tonight..Light winds. Waves flat.
Sun..S winds around 5 kt. Waves 1 ft.
Sun night..S winds around 5 kt. Waves 1 ft or less.
Mon..W winds around 5 kt. Waves 1 ft.
Mon night..Light winds. Waves 1 ft. A chance of showers.
Tue..NW winds 5 to 10 kt. Waves 1 ft.
Tue night..NW winds around 5 kt. Waves 1 ft.
Wed..NW winds 5 kt. Waves less than 1 ft.
Thu..N winds around 5 kt. Waves 1 ft.
ANZ500 936 Pm Est Sat Nov 17 2018
Synopsis for the tidal potomac and md portion of the chesapeake bay.. High pressure will remain overhead through tonight before shifting offshore on Sunday. SEveral waves of low pressure and their associated fronts will move near the waters through the middle of next week.


7 Day Forecast for Marine Location Near Greenbriar, VA
   Hourly   EDIT   Help
location: 38.88, -77.39     debug


Area Discussion for - Baltimore, MD/Washington
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
Fxus61 klwx 180214
afdlwx
area forecast discussion
national weather service baltimore md washington dc
914 pm est Sat nov 17 2018

Synopsis
High pressure over the ohio valley will remain overhead through
tonight before moving offshore on Sunday. Several waves of low
pressure will then pass near the region, the first on Sunday
night, and the second on Monday night. A stronger cold front
will then approach the region from the northwest Wednesday.

Near term until 6 am Sunday morning
High pressure will remain overhead late tonight while low
pressure moves northeast into the midwest. A southwest flow will
develop aloft, and this will cause relatively warmer and more
moist air to overrun the surface cold air in place. Therefore,
clouds are expected to increase, especially north west of the
i-95 corridor. Did tweak temps down a bit in rural areas for
radiational cooling, but temps may hold steady or even rise if
the clouds do develop overnight.

The 18znam continues to show the possibility of drizzle freezing
drizzle toward morning, but most other guidance remains dry.

Will continue with the dry forecast for now since the low-levels
below 2kft are progged to be dry, but still cannot completely
rule out drizzle. Patchy fog is also possible. Lows will range
from the mid to upper 20s in the colder valleys and rural areas,
to the mid and upper 30s in downtown washington and baltimore.

Short term 6 am Sunday morning through Monday night
Southerly flow will develop on Sunday as the weak area of low
pressure moves into the ohio valley. Mostly cloudy skies are
expected, but conditions should remain dry for just about
everywhere. Highs from the mid 40s to low 50s.

The wave of low pressure will pass by near or just to the north
Sunday night. Some light showers are possible overnight, mainly
near the pa border and across eastern WV and western md.

Forecast temperature profiles suggest any precipitation should
be in the form of rain. Lows in the mid 30s to near 40f.

The first area of low pressure will pass eastward on Monday,
while a second low is progged to develop near or west of the
area by Monday afternoon along a frontal boundary. Thus, chances
for rain showers will be on the upward trend Monday, although
at this point, highest probabilities appear west of i-95 and the
metros during the day. The low will move near the region Monday
night and offshore Tuesday morning with the highest chances of
precipitation during this time. Most locations likely to see
rain showers, but a change to snow showers over the higher
terrain appears likely as cold air advection occurs behind the
system Monday night into early Tuesday. A light accumulation of
snow is possible. Highs Monday in the upper 40s to mid 50s with
lows Monday night in the 30s to around 40f.

Long term Tuesday through Saturday
On Tuesday, expecting high pressure to return to the region behind a
passing cold front, bringing dry weather for most of the
region. However, some upslope snow showers are possible along
the allegany front throughout the day, but not expecting much,
if anything, east of there. Cooler air following the frontal
passage will bring continued below average temperatures to the
region, with highs only expected to reach the mid to upper 40s.

On Wednesday, high pressure builds into the region, with dry
conditions expected across the entire area. Temperatures will again
be below average, with temps in the mid 40s. Another cold front will
drop through the region on Wednesday night or early Thursday
morning. This front does not have much moisture or upper forcing to
support precipitation. However, it will bring in much colder air.

High temperatures may struggle to reach 40 on Thursday. With high
pressure building in though, expect it to be a dry day at least.

High pressure continues to build into the region on Friday, bringing
continued dry conditions. Temperatures may rebound slightly, but
remain below average.

Aviation 02z Sunday through Thursday
Vfr expected through late this evening. Low level stratus
clouds are expected to form late tonight and especially Sunday
morning, and MVFR is likely for mrb and cho, and possible at
iad. Lesser chances for MVFR exist eastward to bwi mtn. Its also
not out of the realm of possibilities that some patchy
fog drizzle occur at mrb cho.

Potential for MVFR stratus continues Sunday night into Monday,
with the highest chances continuing at mrb.

Vfr is expected through the long term period. Main issues will
just be periods of gusty winds with passing cold fronts, which
look mostly dry at this point.

Marine
As high pressure builds into the region through Sunday, winds
will trend lighter and sub SCA conditions are expected through
the weekend. Gradient will also remain weak over the waters
Monday and Monday night as weak low pressure approaches from the
west with sub-sca conditions forecast.

Sca conditions will be possible Tuesday as a cold front departs the
region. Winds probably diminish Wednesday.

Climate
Here are the current rankings for wettest year on record
(through november 15th):
washington dc area (dca)
1. 61.33 inches (1889)
2. 60.83 inches (2003)
3. 60.09 inches (1878)
4. 58.58 inches (2018)
5. 58.17 inches (1886)
weather records for the washington dc area have been kept at
what is now ronald reagan washington national airport (dca)
since 1945. Precipitation records observed downtown extend the
period of record back to 1871.

Baltimore md area (bwi)
1. 63.18 inches (2018)
2. 62.66 inches (2003)
3. 62.35 inches (1889)
4. 58.98 inches (1979)
weather records for the baltimore md area have been kept at
what is now baltimore-washington international thurgood marshall
airport (bwi) since 1950. Precipitation records observed
downtown extend the period of record back to 1871.

Dulles va area (iad)
1. 65.67 inches (2003)
2. 59.17 inches (2018)
3. 59.05 inches (1972)
4. 58.09 inches (1996)
5. 55.43 inches (1979)
weather records have been kept at what is now washington dulles
international airport (iad) since 1960.

Note: all climate data are considered preliminary until
reviewed by the national centers for environmental information
(ncei).

Lwx watches warnings advisories
Dc... None.

Md... None.

Va... None.

Wv... None.

Marine... None.

Synopsis... Mm
near term... Bjl mm
short term... Mm
long term... Cjl
aviation... Bjl mm cjl
marine... Bjl mm cjl
climate... Lwx


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 20 mi30 min S 1 G 1.9 40°F 46°F1027.6 hPa
BSLM2 - Chesapeake Bay, MD 37 mi90 min Calm 33°F 1027 hPa32°F
NCDV2 43 mi30 min NNW 1 G 2.9 35°F 48°F1026.7 hPa
APAM2 - 8575512 - Annapolis, MD 49 mi30 min 39°F 1026.8 hPa

Wind History for Washington, DC
(wind in knots)    EDIT      (on/off)   Help
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
2
PM
3
PM
4
PM
5
PM
6
PM
7
PM
8
PM
9
PM
10
PM
Last
24hr
NW11
G18
NW8
G14
NW8
G12
NW6
G14
NW4
G11
NW5
NW4
G8
NW4
G7
NW6
G10
NW6
N4
G9
NW10
G14
NW6
G12
NW5
G9
W5
G8
NW4
NW4
G8
NW5
NW4
NW2
--
N3
SW1
SW3
1 day
ago
N5
G9
NW10
G16
NW11
G18
NW13
G21
NW8
G14
W10
G13
NW4
G7
W3
W4
G9
NW5
G10
NW14
G18
W9
G16
NW12
G16
W11
G14
NW10
G16
NW9
G12
W7
G12
W5
G9
NW3
NW5
W5
NW6
G11
NW8
G16
W12
G18
2 days
ago
NE3
G7
NE3
G7
NE4
G8
E3
G7
NE3
G6
NE4
E5
G11
E3
G6
N3
NE4
G10
NE4
G7
NE1
G8
NE3
NE4
G10
NE3
G9
N4
G11
N6
G15
N6
G11
NE5
G12
NE4
G12
N7
G12
NE8
G16
N6
G10
N4
G10

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Washington/Dulles International Airport, DC, VA6 mi68 minN 010.00 miFair33°F30°F92%1027.4 hPa
Manassas, Manassas Regional Airport/Harry P. Davis Field, VA13 mi64 minN 09.00 miFair30°F28°F92%1028.7 hPa
Fort Belvoir, VA15 mi64 minN 010.00 miFair33°F32°F99%1027.8 hPa
Leesburg / Godfrey, VA17 mi65 minN 310.00 miFair34°F32°F93%1027.4 hPa
Washington/Reagan National Airport, DC, VA19 mi68 minN 010.00 miA Few Clouds43°F33°F68%1027.4 hPa
Gaithersburg - Montgomery County Airport, MD23 mi64 minN 010.00 miFair29°F27°F92%1030.3 hPa

Wind History from IAD (wind in knots)
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
2
PM
3
PM
4
PM
5
PM
6
PM
7
PM
8
PM
9
PM
10
PM
Last 24hrW5W5SW3S3N6CalmNW5NW9NW8NW14
G20
NW9NW8NW11NW13NW8W10W6NW6NW4N4CalmCalmCalmCalm
1 day agoN11NW10NW16NW13W11W6NW15NW12
G20
NW9NW7CalmNW16
G22
W9W14W9W10W6W5NW5E5NW3NW4NW9SW3
2 days agoNE6NE8E8E6E7E6E7NE4E5NE6NE9NE8NE8NE10NE12N11
G17
N10N12N11N11N10N9NW12N11

Tide / Current Tables for Chain Bridge, D.C.
   EDIT   RT Ports Option   Weekend mode (on/off)   (on/off)   Help   One Week of Data
Chain Bridge
Click for Map
Sat -- 12:51 AM EST     Moonset
Sat -- 03:31 AM EST     2.68 feet High Tide
Sat -- 06:53 AM EST     Sunrise
Sat -- 10:01 AM EST     0.28 feet Low Tide
Sat -- 02:14 PM EST     Moonrise
Sat -- 04:07 PM EST     2.66 feet High Tide
Sat -- 04:53 PM EST     Sunset
Sat -- 10:24 PM EST     0.34 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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
2
pm
3
pm
4
pm
5
pm
6
pm
7
pm
8
pm
9
pm
10
pm
11
pm
1.422.42.62.62.31.81.20.70.40.30.40.91.62.22.52.72.52.11.50.90.60.40.4

Tide / Current Tables for Chain Bridge, one mile below, D.C.
   EDIT      (on/off)   Help   One Week of Data
Chain Bridge
Click for Map
Sat -- 12:51 AM EST     Moonset
Sat -- 03:26 AM EST     2.68 feet High Tide
Sat -- 06:53 AM EST     Sunrise
Sat -- 09:56 AM EST     0.28 feet Low Tide
Sat -- 02:14 PM EST     Moonrise
Sat -- 04:02 PM EST     2.66 feet High Tide
Sat -- 04:53 PM EST     Sunset
Sat -- 10:19 PM EST     0.34 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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
2
pm
3
pm
4
pm
5
pm
6
pm
7
pm
8
pm
9
pm
10
pm
11
pm
1.42.12.52.72.62.31.81.20.70.40.30.411.72.22.52.72.521.50.90.50.40.4

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.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Baltimore, MD/Washington (23,6,7,8)
      (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.