Tuesday, October16, 2018 L-36.com


Marine Weather and Tides
Halfway, MD

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 7:21AMSunset 6:30PM Tuesday October 16, 2018 2:18 PM EDT (18:18 UTC) Moonrise 1:25PMMoonset 11:19PM Illumination 47% 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
ANZ538 Patapsco River Including Baltimore Harbor- 136 Pm Edt Tue Oct 16 2018
.small craft advisory in effect from Wednesday morning through late Wednesday night...
This afternoon..W winds 5 to 10 kt. Waves 1 ft.
Tonight..W winds 5 to 10 kt. Waves 1 ft.
Wed..W winds 15 to 20 kt with gusts to 30 kt. Waves 1 to 2 ft.
Wed night..NW winds 10 to 15 kt with gusts to 30 kt. Waves 1 to 2 ft.
Thu..NW winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft.
Thu night..NW winds 5 to 10 kt. Gusts up to 20 kt in the evening. Waves 1 ft.
Fri..SW winds 5 to 10 kt. Waves 1 ft or less. Showers likely through the night.
Sat..W winds 10 to 15 kt. Waves 1 ft. Showers likely, mainly in the morning.
ANZ500 136 Pm Edt Tue Oct 16 2018
Synopsis for the tidal potomac and md portion of the chesapeake bay.. High pressure will build over the waters through tonight while a weak wave of low pressure passes by to the south. A cold front will pass through the waters Wednesday and high pressure will build overhead for Thursday before moving offshore Friday. Another cold front will pass through the waters Saturday. Small craft advisories will likely be needed for Thursday, and again Friday afternoon through Saturday.


7 Day Forecast for Marine Location Near Halfway, MD
   Hourly   EDIT   Help
location: 39.62, -77.79     debug


Area Discussion for - Baltimore, MD/Washington
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
Fxus61 klwx 161342
afdlwx
area forecast discussion
national weather service baltimore md washington dc
942 am edt Tue oct 16 2018

Synopsis
A wave of low pressure will pass offshore to the
south near the virginia north carolina border later today
through tonight, followed by a secondary cold front moving
southward by late Wednesday. High pressure will build eastward
from the ohio valley into the mid- atlantic Thursday, then pull
offshore Friday as a cold front approaches from the west.

Near term through tonight
A boundary will remain to the south today while high pressure
builds in from the north. A southwest flow aloft will continue
between and upper-level high over the southeastern CONUS and an
upper-level trough over the great lakes. The southwest flow
aloft will result in a bkn to at times ovc deck of high and
mid-level clouds. However, dry conditions are expected today and
there will be some breaks of sunshine. MAX temps will range from
the upper 40s and lower 50s in the mountains to the upper 50s to
lower 60s for most other locations. A wave of low pressure will
move along the boundary tonight with precip developing to the
north of the front possibly reaching areas from south of
charlottesville to fredericksburg and st. Marys county. Will
only have 20 to 30% pops for these areas through 12z Wednesday.

There will be more high and mid-level clouds. Low temps will
range from the 30s along the allegheny front to the lower 50s in
southern maryland.

Short term Wednesday through Thursday night
A secondary push of cold air will move through the area wed
afternoon with only high clouds. High pressure then builds over
the area Wed night through Thu night. Freezing temperatures
appear likely for the higher elevations as h85 temps drop to -6c
over the mtns.

Long term Friday through Monday
Autumnal weather will be featured for the end of the week, through
the weekend, and into early next week with temperatures skewing
below normal.

Following what will likely be the coldest morning of the season so
far Friday morning, warm air advection will already be beginning. So
a mostly sunny start to the day will see clouds on the increase by
the afternoon, and perhaps even a shower late in the day for western
areas. Temperatures will be slightly below normal with highs in the
upper 50s to low 60s.

A system will pass north of the region Friday night and Saturday,
with its warm front crossing Friday night and attendant cold front
passing Saturday. This will increase shower chances for Friday
night, with chances lingering into Saturday morning. Drying west to
northwest flow will then take over behind the front by later
Saturday and Saturday night for most, with the exception being in
the upslope areas along and near the allegheny front where rain snow
showers will be possible. Temperatures will be milder Friday night
and Saturday with lows in the 40s 50s and highs in the 60s, then
falling Saturday night through the 40s.

Northwest flow will then dominate for Sunday behind the departing
system before high pressure returns for Sunday night and Monday. Dry
and cool conditions are expected, with highs about 10 degrees below
normals, in the 50s, and lows in the 30s to around 40f.

Aviation 14z Tuesday through Saturday
Winds will diminish today below 10 kt and gradually turn more
toward the southwest later this afternoon. Gusty NW winds with
gusts up to 30 mph are expected again Wed afternoon with passage
of a dry cold front. Winds diminish somewhat Thu afternoon but
still breezy with gusts up to 25 mph.

Vfr expected on Friday with increasing mid high clouds. There is
potential for sub-vfr conditions Friday night into Saturday morning
as a system moves through with chances for rain showers.VFR will
return Saturday afternoon with developing gusty west to northwest
winds.

Marine
Winds expected to diminish below SCA by this afternoon. Sca
conditions expected again Wed afternoon through Thu evening
under cold air advection pattern.

Sca conditions become increasingly likely Friday afternoon and
Friday night as southerly flow increases out ahead of an
approaching system. As the system passes through and departs
Saturday, SCA conditions are probable with gusty west to
northwest winds.

Lwx watches warnings advisories
Dc... None.

Md... None.

Va... None.

Wv... None.

Marine... Small craft advisory until noon edt today for anz532>534-537-
541>543
small craft advisory from 11 am to 6 pm edt Wednesday for
anz530>543.

Synopsis... Lfr
near term... Bjl lfr
short term... Lfr
long term... Mm
aviation... Bjl mm lfr
marine... Bjl mm 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 66 mi30 min NW 8 G 9.9 59°F 66°F1021.8 hPa
BLTM2 - 8574680 - Baltimore, MD 69 mi30 min N 6 G 8 70°F1020.9 hPa
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 72 mi30 min WNW 8 G 12 57°F 1021.1 hPa

Wind History for Washington, DC
(wind in knots)    EDIT      (on/off)   Help
-12
PM
-12
PM
-12
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
S4
G7
S6
G9
S5
G8
SW5
G9
S6
S5
SW3
N9
G20
N10
G19
N5
G11
NW11
G16
N5
G15
N9
G13
NW11
G19
N6
G12
NW6
G13
N5
G11
N4
G7
NW11
G15
NW4
G9
NW5
G9
1 day
ago
S3
S7
2 days
ago
NW9
G15
NW7
G11
NW11
G15
NW6
G14

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Hagerstown, Washington County Regional Airport, MD7 mi25 minW 510.00 miFair55°F35°F47%1022.4 hPa
Eastern WV Regional Airport/Shepherd Field, WV18 mi25 minW 710.00 miFair55°F37°F53%1021.5 hPa

Wind History from HGR (wind in knots)
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
2
PM
Last 24hrS10S11
G18
S9S5SW5S7NW9W9NW12NW12NW18
G23
NW7NW9NW8NW9NW3NW9N4NW6N9NW8W8W5W5
1 day agoS5S6S5SE4SE5SE5S7S6S6S5SE5SE7S5S4S6S5S9S7S7S8S7S7S9S8
2 days agoNW11NW11W11W8W7W5W6SW4SW3CalmW3CalmE4CalmCalmCalmS4S3S3S3CalmS7S9S6

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
Tue -- 02:23 AM EDT     3.09 feet High Tide
Tue -- 07:19 AM EDT     Sunrise
Tue -- 09:24 AM EDT     0.53 feet Low Tide
Tue -- 02:02 PM EDT     First Quarter
Tue -- 02:19 PM EDT     Moonrise
Tue -- 03:07 PM EDT     2.76 feet High Tide
Tue -- 06:28 PM EDT     Sunset
Tue -- 09:12 PM EDT     0.54 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
2.42.93.132.72.11.61.10.80.60.611.72.22.62.82.62.21.610.70.50.61

Tide / Current Tables for Chain Bridge, one mile below, D.C.
   EDIT      (on/off)   Help   One Week of Data
Chain Bridge
Click for Map
Tue -- 02:18 AM EDT     3.09 feet High Tide
Tue -- 07:18 AM EDT     Sunrise
Tue -- 09:19 AM EDT     0.53 feet Low Tide
Tue -- 02:02 PM EDT     First Quarter
Tue -- 02:19 PM EDT     Moonrise
Tue -- 03:02 PM EDT     2.76 feet High Tide
Tue -- 06:28 PM EDT     Sunset
Tue -- 09:07 PM EDT     0.54 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
2.42.93.132.62.11.51.10.80.50.61.11.72.32.62.82.62.11.510.70.50.61.1

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 (14,3,4,5)
      (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.