Wednesday, January23, 2019 L-36.com


Marine Weather and Tides
Washington Boro, PA

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 7:19AMSunset 5:14PM Wednesday January 23, 2019 4:48 AM EST (09:48 UTC) Moonrise 8:26PMMoonset 9:16AM Illumination 94% Phase: Waning Gibbous; Moon at 17 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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ANZ530 Chesapeake Bay North Of Pooles Island- 337 Am Est Wed Jan 23 2019
.small craft advisory in effect through Thursday afternoon...
Rest of the overnight..S winds 10 kt with gusts to 20 kt. Waves 2 ft.
Today..S winds 5 to 10 kt with gusts to 20 kt. Waves 2 ft.
Tonight..S winds 15 to 20 kt with gusts to 30 kt. Waves 2 ft. Rain. Vsby 1 to 3 nm.
Thu..SW winds 15 to 20 kt...becoming nw in the afternoon. Gusts up to 30 kt. Waves 2 ft. Rain.
Thu night..W winds 5 to 10 kt with gusts to 20 kt. Waves 1 to 2 ft.
Fri..W winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft.
Fri night..NW winds 5 to 10 kt. Waves 1 ft.
Sat..SE winds around 5 kt. Waves 1 ft.
Sun..W winds 5 to 10 kt. Waves 1 to 2 ft.
ANZ500 337 Am Est Wed Jan 23 2019
Synopsis for the tidal potomac and md portion of the chesapeake bay.. High pressure will shift into the western atlantic tonight. A cold front approaching from the ohio valley will cross the waters by Thursday afternoon. High pressure will follow Friday into the weekend. A gale warning may be needed Thursday and small craft advisories may be needed Thursday night.


7 Day Forecast for Marine Location Near Washington Boro CDP, PA
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location: 40, -76.49     debug


Area Discussion for - Baltimore, MD/Washington
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Fxus61 klwx 230850
afdlwx
area forecast discussion
national weather service baltimore md washington dc
350 am est Wed jan 23 2019

Synopsis
A warm front will move into the region late today through
tonight before a cold front passes through from the west late
tonight into Thursday morning. Canadian high pressure will
return for late Thursday but a reinforcing cold front will pass
through Friday. High pressure will return for Saturday and
another reinforcing cold front may pass through Sunday. Low
pressure may develop off the southeast coast early next week.

Near term until 6 pm this evening
High pressure remains offshore and low pressure is tracking
through the midwest. A southerly flow has allowed for milder
conditions compared to recent nights, but clouds have already
overspread the area well ahead of the low.

The low will track into the great lakes today and the southerly
flow will continue in between the low and the high over the
atlantic. This will allow for milder conditions compared to
recent days. However, warm and moist air will overrun the
surface colder air in place, resulting in plenty of clouds
along with increasing chances for rain and drizzle. Still feel
that the steadiest rain will hold off for most of the day, if
not all day since it will be closer to a cold front associated
with the low to our west. However, light rain and drizzle will
increase in coverage throughout the day due to the overrunning.

One thing to watch out for is the timing of the light
rain drizzle. If it moves in early enough then temperatures near
or below freezing could result in freezing rain and or freezing
drizzle. Given the high temp dewpoint depressions, latest
thinking is that most of the area should be ok. However, across
central virginia where the moisture will arrive first a chance
for freezing rain has been added to the forecast. Confidence is
not high enough for an advisory at this point, but there may be
slippery spots especially between about 8 am and noon across
central virginia. Also note that even if surface temps are a
little above freezing, there can still be some slippery spots
due to the recent cold air that has been in place. Will continue
to monitor throughout this morning.

Max temps are forecast to top off in the 40s for most areas, but
much of the day and even early evening hours may hold in the 30s
for the valleys west of interstate 95, especially if light rain
and drizzle arrives a little earlier than currently forecasted.

Short term 6 pm this evening through Friday night
Low pressure will track through southern canada and the warm
front associated with the low will move overhead tonight while
the cold front associated with the low approaches from the west
this evening before moving into the potomac highlands overnight.

The cold front will pass through the rest of the area Thursday
morning. A southerly flow will increase between these systems,
and this will continue to allow warm and moist air to advect
into the area. A strengthening low-level jet and shortwave
energy will allow for rain to become more widespread, and even
become locally heavy ahead of the frontal passage late tonight
into Thursday morning. Did issue a flood watch for late tonight
into Thursday across central virginia and for most locations
near and west of the blue ridge and catoctin mountains
(excluding southern maryland for now). The deepest moisture is
expected across these areas with rainfall amounts around 1 to
1.5 inches most likely. Most of that rain may fall in a three
hour period or so late tonight Thursday morning. With a nearly
frozen ground there can be excess runoff as well. Therefore, the
flood watch has been issued. For other areas, isolated flooding
is possible late tonight into Thursday, but confidence for
watch was not high enough at this time given less rainfall
amounts (to the northwest) or higher FFG (across southern
maryland).

Temperatures will continue to increase tonight due to the
souther flow. Temps well into the 50s and maybe even 60s are
possible by Thursday morning near and east of interstate 95.

Behind the cold front later Thursday morning and afternoon,
northwest winds will bring a return of seasonably chilly
conditions. Therefore, temperatures will fall later Thursday
back into the 30s and 40s (20s in the mountains). Rain may end
as a brief period of snow, but any accumulation would most
likely be confined to locations along west of the allegheny
front. Some sunshine should return Thursday afternoon as well
thanks to the drier air.

High pressure will briefly build overhead Thursday night,
bringing dry and seasonably cold conditions. A reinforcing cold
front will pass through Friday. A few snow showers are possible
along the frontal passage for most areas. A heavier burst of
snow or perhaps even a snow squall is possible along the frontal
passage, even for areas east of the highlands. Latest guidance
shows some instability and relatively strong forcing along the
cold front. High pressure will return for later Friday and
Friday night, bringing dry but cold conditions.

Long term Saturday through Tuesday
High pressure will stretch along the eastern seaboard on
Saturday as an upper level low and deep layered troughing
churns north of the great lakes. A weak area of low pressure may
deliver upslope snow showers late Saturday into Sunday with
minor accumulation possible. In the wake of an arctic frontal
passage late Friday, temperatures on Saturday will run 5 to 10
degrees below normal, with highs ranging from the upper 20s to
upper 30s across the area. Teens and 20s will be realized
Saturday night.

The aforementioned upper low will dig and deepen into the great
lakes on Sunday, and along with a surface cold front nearing the
ohio valley, another round of upslope snow looks likely late
Sunday into Sunday night. Am carrying a slight chance of
rain snow showers along and just east of the blue ridge as the
flow aloft will be a stronger and there is a bit more moisture
to work with. Temperatures are poised to run at or just below
normal both Sunday and Sunday night. Low pressure dropping
southward out of canada will near the mississippi valley on
Monday, with warm air advection moving overhead, and southerly
winds increasing at the surface. Right now, global models in
decent agreement at this time with this low passing just to our
west late Monday into Tuesday, with no phasing between the
northern and southern streams until the system is north and east
of the region. Obviously something that will bear watching over
the next several days. That being said, colder air will be
knocking on our door as the bulk of the precip moves through the
area, so keeping a chance of rain snow showers Monday night and
into Tuesday. Drier and colder conditions prevail Tuesday night
behind a frontal passage.

Aviation 08z Wednesday through Sunday
Will have to watch for light freezing rain or freezing drizzle
near kcho around mid-morning. Confidence is low at this time,
but it is possible that there could be some slippery spots near
kcho before temperatures rise above freezing.

Elsewhere: low clouds will increase this morning over the
terminals with MVFR conditions. Ifr conditions are likely to
develop this afternoon into this evening, although confidence on
the exact timing is low as of now. Light rain and drizzle will
increase in coverage during this time as well.

For tonight, a steady rain will develop with MVFR and ifr
conditions expected. Rain may be locally heavy at times. A brief
period of gusty winds in showers are possible early Thursday
morning across the eastern terminals. Northwest winds will
develop later Thursday morning behind a cold front and
cigs vsbys will improve. A few snow showers are possible Friday,
especially during the morning and midday hours. Otherwise,VFR
conditions are expected Friday and Friday night.

Vfr conditions likely for the bulk of the weekend, with the best
potential for flight restrictions at mrb late Sunday and Sunday
night in passing snow showers. Light southerly winds on Saturday
will increase Saturday night and into Sunday, veering out of the
west.

Marine
A southerly flow will continue through tonight ahead of an
approaching cold front. The cold front will pass through
Thursday morning and winds will shift to the northwest behind
the front. There is a small craft advisory in effect through
this afternoon for the bay and lower tidal potomac river as
mixing should allow for wind gusts to reach criteria as gradient
increases ahead of frontal boundary. The SCA is in effect for
all of the waters tonight and Thursday. Strong gradient should
overcome low-level stability and result in SCA gusts during
this time.

Will have to watch for a line of gusty showers that may develop
along the cold front Thursday morning. Special marine warnings
may be warranted.

High pressure will reside over the waters on Saturday with light
winds and sub SCA conditions expected. Winds will increase Saturday
night through Sunday night as the high shifts offshore and return
flow increases, bringing the potential for SCA conditions over
portions of the waters.

Hydrology
Strong low-level moisture flux beneath a stout mid-level
shortwave and strong upper divergence in the right-entrance
region of a 150+ kt jet MAX will all aid in lift to result in
widespread moderately heavy rain across much of the mid-atlantic
late tonight into Thursday. Rainfall totals around an inch,
with isolated totals up to 1.5 inches are possible during this
time. Areas across central virginia and up the i-95 corridor may
see the highest rainfall totals as the upper jet low-level
moisture flux strengthen over these areas through Thursday
morning. Pwats of 1.25+ inches and warm cloud layer depths near
10kft along a strongly forced frontal zone could result in an
overproductive band of moderately heavy rain along the front
Thursday morning. Given frozen ground, recent precipitation and
some snow and ice melt, small stream and urban flooding is
possible during this time. Main stem river flooding may persist
through Friday.

Tides coastal flooding
Tidal anomalies will continue to increase into Thursday as southerly
flow persists over the waters. The potential for minor flooding will
exist as a result, however, given a large spread in guidance and
uncertainty in the strength of surface winds, confidence is low at
this time.

Lwx watches warnings advisories
Dc... Flood watch from late tonight through Thursday afternoon for
dcz001.

Md... Flood watch from late tonight through Thursday afternoon for
mdz004>006-011-013-014-016-503>508.

Va... Flood watch from this evening through Thursday morning for
vaz025-036-503-504-508.

Flood watch from late tonight through Thursday afternoon for
vaz037>040-050-051-507.

Flood watch from late tonight through Thursday afternoon for
vaz052>056-501-502-505-506.

Wv... None.

Marine... Small craft advisory until 6 pm est Thursday for anz530>534-
537-539>541-543.

Small craft advisory from 8 pm this evening to 6 pm est
Thursday for anz535-536-542.

Small craft advisory until 6 pm est Thursday for anz538.

Synopsis... Bjl
near term... Bjl
short term... Bjl
long term... Bkf
aviation... Bjl bkf
marine... Bjl bkf
hydrology... Dhof
tides coastal flooding... Bkf


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
CHCM2 - 8573927 - Chesapeake City, MD 49 mi48 min SSE 2.9 G 8 28°F 33°F1030.7 hPa (-3.0)
BLTM2 - 8574680 - Baltimore, MD 51 mi48 min SW 2.9 G 8 30°F 37°F1029.6 hPa (-3.3)
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 54 mi48 min S 14 G 17 31°F 1029.7 hPa (-3.3)

Wind History for Chesapeake City, MD
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Lancaster, Lancaster Airport, PA13 mi55 minSE 610.00 miFair28°F18°F66%1028.8 hPa
Harrisburg, Harrisburg International Airport, PA21 mi52 minSE 610.00 miOvercast29°F14°F54%1028 hPa
York, York Airport, PA21 mi55 minS 410.00 miFair29°F10°F47%1028.4 hPa

Wind History from LNS (wind in knots)
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Last 24hrW5NW5W5NW5NW6NW54NW6W5W53S3SE5SE5SE5S8S7S4S7S9SE8SE5SE5SE6
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Tide / Current Tables for Port Deposit, Susquehanna River, Maryland
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Port Deposit
Click for Map
Wed -- 07:19 AM EST     Sunrise
Wed -- 07:48 AM EST     -0.43 feet Low Tide
Wed -- 09:13 AM EST     Moonset
Wed -- 11:59 AM EST     1.51 feet High Tide
Wed -- 05:13 PM EST     Sunset
Wed -- 07:10 PM EST     -0.99 feet Low Tide
Wed -- 08:25 PM EST     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.62.42.11.510.4-0-0.3-0.4-0.10.61.21.51.410.5-0-0.5-0.8-1-0.8-0.20.71.7

Tide / Current Tables for Havre de Grace, Susquehanna River, Maryland
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Havre de Grace
Click for Map
Wed -- 05:51 AM EST     -0.50 feet Low Tide
Wed -- 07:19 AM EST     Sunrise
Wed -- 09:13 AM EST     Moonset
Wed -- 11:22 AM EST     1.72 feet High Tide
Wed -- 05:13 PM EST     Sunset
Wed -- 05:40 PM EST     -0.26 feet Low Tide
Wed -- 08:25 PM EST     Moonrise
Wed -- 11:23 PM EST     2.32 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.11.71.10.50-0.4-0.5-0.30.30.91.41.71.71.410.60.1-0.2-0.20.10.61.422.3

Weather Map and Satellite Images
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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.
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Wind Forecast for Baltimore, MD/Washington (4,6,7,8)
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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.