Monday, January22, 2018 L-36.com


Marine Weather and Tides
Chambersburg, PA

Version 3.4
What's New / NOTES
6/25/2017 - NOAA is having a major issue that impact the 7 day forecast load times. Many users are reporting problems. The issue has been reported.
5/23/2017 - Worked with NOAA again to speed up the 7 day forecast load times. Thanks to them for being responsive.
5/19/2016 - There were issues with the 3 day airport observation history. I switched to another data source. Let me know if you see any issues with the data feeds.

Sunrise 7:24AMSunset 5:20PM Monday January 22, 2018 3:08 PM EST (20:08 UTC) Moonrise 10:33AMMoonset 10:50PM Illumination 35% Phase: Waxing Crescent; Moon at 6 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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ANZ538 Patapsco River Including Baltimore Harbor- 1231 Pm Est Mon Jan 22 2018
.small craft advisory in effect from late tonight through Tuesday afternoon...
This afternoon..S winds 10 kt. Waves 1 ft.
Tonight..S winds 5 to 10 kt. Gusts up to 20 kt in the late evening and overnight. Waves 1 to 2 ft. Widespread showers.
Tue..S winds 10 to 15 kt...becoming W in the afternoon. Gusts up to 25 kt. Waves 1 to 2 ft. Widespread showers with a chance of tstms.
Tue night..W winds 10 kt with gusts to 20 kt. Waves 1 ft.
Wed..NW winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft.
Wed night..NW winds 5 to 10 kt. Waves 1 ft.
Thu..NW winds 5 to 10 kt...becoming light. Waves 1 ft or less.
Fri..S winds around 5 kt. Waves 1 ft or less. Winds and waves higher and visibilities lower in and near tstms.
ANZ500 1231 Pm Est Mon Jan 22 2018
Synopsis for the tidal potomac and md portion of the chesapeake bay.. High pressure will remain off the southeast coast today. A cold front will approach the area tonight and cross the area Tuesday. This will be followed by another area of high pressure for the second half of the week. Small craft advisories will likely be needed Tuesday night through Thursday, with gales possible Tuesday with the frontal passage.

7 Day Forecast for Marine Location Near Chambersburg , PA
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location: 39.93, -77.66     debug


Area Discussion for - State College, PA
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Fxus61 kctp 222006
afdctp
area forecast discussion
national weather service state college pa
306 pm est Mon jan 22 2018

Synopsis
A potent area of low pressure moving across the great lakes will
push a trailing cold front through the commonwealth on Tuesday.

Temperatures will stay above normal into early Tuesday, before
falling back to near or slightly below normal Wednesday and
Thursday. Dry weather is expected for the second half of the
week. The temperatures will rebound to above normals by the
weekend.

Near term until midnight tonight
Warm front has passed thru most of the area, and only a few
sprinkles are possible in the next two hours over the far N e.

The temps are soaring over the south with jst almost 60f at 2
pm. But, wind just starting to get into the mid and upper susq r
valley locations. They will warm up a little this evening, then
stay nearly steady (as will the rest of the area) through the
rest of the night. Otherwise, it will be rather quiet through
the evening. The band of showers on over central oh will
continue eastward but also break apart a bit as it is stretched
thin and gets too far away from upper support. Any rain from the
band should hold off until after 9 or 10pm, and only the far nw
is likely to get rain before midnight.

Short term midnight through 6 pm Tuesday
Again, the temps should remain fairly steady through the night,
cooling off a little as the rain falls. Pops will stay high, but
precip does not look to be a solid area, rather a few lines of
showers. There will be some instability develop through the
night as the occluded zone moves overhead. We will mention a
slight chc thunder moving across the state from w-e overnight
following the lowered lis on both GFS and NAM aloft thru the
night. But, the chc of t lingers into the day in the SE lower
susq, and may actually be greater in the daytime on Friday if
there can be some heating as the cfront zips thru. Temps will
get lower quickly in the aftn over the NW and laurels, and any
remaining shra should start to mix with sn. Upslope and main low
cloud shield under the upper trough will supply support for sct
shsn tues evening.

Long term Tuesday night through Monday
The progressive pattern will keep the mid late week cool-down
rather brief before temperatures moderate trend warmer into the
upcoming weekend.

Gusty westerly winds with top values between 35 and 45 mph will
continue Tuesday night, before gradually decreasing through the
day Wednesday.

Occasional snow showers are likely downwind of lake erie
Tuesday night and Wed but should only amount to light accums of
a coating to 2 inches in most places.

Dry wx under high pressure thu- Fri with chilly starts to the
day (especially in the east) with moderating temperatures
heading into the weekend as the next (weaker) low pressure
system lifts across the great lakes bringing chances for rain on
sat increasing into Sunday.

Aviation 20z Monday through Saturday
Main problem for the next 6-8 hours is the increase in wind
speed aloft as a strong low level jet noses in and intensifies
over pa. Ssw wind at 2-3kft will peak around 55kt late tonight.

A cold front will push through around sunrise in the w, and
early aftn in the e. There will be occasional shra through the
night, and the wind will be generally light through the night.

Ifr will likely be limited to inside the showers. There is a
very small chance of TS in the area overnight, and in the se
tues before 18z. Have not mentioned it in the TAF yet due to low
confidence of occurrence. Expect the llws to not go away until
cfropa, then mechanical mixing will make it very gusty on tues.

The highest gusts will be at jst.

Cold air will turn the lingering shra over the W in the aftn to
shsn. Sct shsn will then continue over the high terrain of the
west into wed.

Outlook...

wed... Am shsn possible W mtns.

Thu-sat... No sig wx expected.

Hydrology
After coordination with local officials, some concern does still
exist for minor flooding along and near the susq between york
haven and safe harbor. Therefore, the flood watch for this area
has been extended into Tuesday afternoon. Due to the mild
temperatures, there is a potential for ice movement, but there
will also be deterioration thinning of the ice through time.

All locations along rivers and streams that have significant ice
buildup should monitor water levels closely.

The anticipated rainfall totals of 0.5 to 1.0 inches over the
next 48 hrs is much less than we had a few days ago, and the ice
is less pervasive extensive due to our relatively mild temps
(versus the period leading up to our previous significant
rainfall). So, no other areas will be placed into flood watch at
this time.

Ctp watches warnings advisories
Flood watch through Tuesday afternoon for paz065-066.

Synopsis... Dangelo
near term... Dangelo
short term... Dangelo
long term... Lambert rxr
aviation... Dangelo
hydrology...



Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
BLTM2 - 8574680 - Baltimore, MD 73 mi50 min SSE 1.9 G 2.9 56°F 34°F1017.5 hPa
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 78 mi50 min E 7 G 8 51°F 1017.9 hPa
WASD2 - 8594900 - Washington, DC 81 mi50 min S 6 G 8 58°F 34°F1017.6 hPa

Wind History for Baltimore, MD
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Hagerstown, Washington County Regional Airport, MD16 mi75 minWNW 35.00 miA Few Clouds with Haze57°F45°F64%1017.2 hPa

Wind History from HGR (wind in knots)
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Last 24hrS5SE3CalmCalmCalmCalmCalmCalmSW5S3CalmSE5NW3CalmNW4NW3NW3E5W3NW5NW5CalmNW3S7
1 day agoW5SW4SW4SW4SW4W7S3W3SW4SW55NW6CalmCalmCalmSE4CalmSE4CalmSE6S6S3S4S4
2 days agoSW5SW5SW4S6SW6W43CalmSW4SW6SW7S5S5S6S7S8S7W11
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Tide / Current Tables for Middle Branch, Baltimore Harbor, Maryland
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Middle Branch
Click for Map
Mon -- 04:56 AM EST     -0.16 feet Low Tide
Mon -- 07:21 AM EST     Sunrise
Mon -- 10:29 AM EST     Moonrise
Mon -- 10:29 AM EST     0.67 feet High Tide
Mon -- 04:38 PM EST     -0.12 feet Low Tide
Mon -- 05:15 PM EST     Sunset
Mon -- 10:46 PM EST     Moonset
Mon -- 10:48 PM EST     0.89 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.70.50.20-0.1-0.2-0.10.10.30.50.70.70.50.40.2-0-0.1-0.1-00.20.40.70.80.9

Tide / Current Tables for Middle Branch, Baltimore Harbor, Patapsco River, Maryland
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Middle Branch
Click for Map
Mon -- 04:56 AM EST     -0.16 feet Low Tide
Mon -- 07:21 AM EST     Sunrise
Mon -- 10:29 AM EST     Moonrise
Mon -- 10:29 AM EST     0.67 feet High Tide
Mon -- 04:38 PM EST     -0.12 feet Low Tide
Mon -- 05:15 PM EST     Sunset
Mon -- 10:46 PM EST     Moonset
Mon -- 10:48 PM EST     0.89 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.70.50.20-0.1-0.2-0.10.10.30.50.70.70.50.40.2-0-0.1-0.1-00.20.40.70.80.9

Weather Map and Satellite Images
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Weather Map
wmap_A
IR Satellite Image from GEOS
east_satellite

GOES Local Image of Mid-Atlantic    EDIT
Geos

Wind Forecast for State College, PA (15,3,4,5)
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Ground Weather Radar Station Sterling, VA
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weather_mapweather_map weather_map

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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.