Tuesday, January22, 2019 L-36.com


Marine Weather and Tides
Acworth, GA

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 7:40AMSunset 6:00PM Tuesday January 22, 2019 7:56 AM EST (12:56 UTC) Moonrise 7:57PMMoonset 8:56AM Illumination 97% Phase: Waning Gibbous; Moon at 16 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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7 Day Forecast for Marine Location Near Acworth, GA
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location: 34.1, -84.62     debug


Area Discussion for - Peachtree City, GA
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Fxus62 kffc 221141
afdffc
area forecast discussion
national weather service peachtree city ga
641 am est Tue jan 22 2019

Prev discussion issued 455 am est Tue jan 22 2019
short term today through Wednesday ...

Winter weather advisory NE mountains this evening...

another cold start across the forecast area this morning with a
large expanse of low to mid 20s across the far northern tier and
right around freezing elsewhere. We still have some good
radiational cooling hours to go and anticipate everyone to be
below freezing by the time all is said and done, despite the
abundance of high clouds streaming across the area. Of note on the
regional satellite imagery is the influx in moisture coming off
the gulf of mexico and into the gulf coast region, an important
component in the anticipated wx the next 24 hours.

The high will shift offshore today and allow some moderation to
the airmass as temperatures climb into the mid 40s across the
metro and lower to mid 50s across central ga. NE ga will hold onto
the colder temps longer and more importantly the very low
dewpoints with mid teens values still prevalent by late afternoon.

This will set the stage for a potential light icing event for the
higher elevations as weak isentropic lift develops and should be
just enough to produce some light precipitation by this evening.

Wet bulb effects will be reduced by the lack of intense
precipitation rates, but it will only take a few degrees to get
temps at or just below freezing. Duration of the event looks to be a
short one and QPF will be lacking but still the potential for a
marginal icing event with values approaching a tenth of an inch max
should model temps verify. Have, after collaboration with adjacent
offices, gone with a winter weather advisory for the cluster of 4
counties in our far NE zones from 00z through 09z on wed.

Elsewhere, QPF will increase through Wed with categorical pops in
the offing. Have introduced some thunder for far SW portions late
wed afternoon although MUCAPE values are quite low. Heaviest of
the activity will be Wed night in the extended but still could see
a quick half an inch through 00z thu.

Deese
long term Wednesday night through Monday ...

a line of moderate to heavy showers ahead of cold front will be
moving through the area Wednesday night with 1-2" of rain expected
for the forecast area (with the highest amounts expected for far
north georgia, per usual). An occasional rumble of thunder isn't out
of the question with some weak upper-level instability, but with no
surface-based instability overnight, the threat of any severe
weather with this line seems improbable at this time. There is a
chance that the colder air from behind the front could just catch up
with some of the precip on the backside of the line in which case
some light snow flurries could be possible for NW ga. But the
probability is small and no real accumulations are expected.

A weaker, secondary "cold front" is then expected Thursday overnight
into Friday morning, more of the result of a strong, canadian high
pressure forcing its way into the area. The front is expected to be
dry. There will be an outside shot of some very light snow flurries
to the far north but the chances of that have waned with each
passing day.

Speaking of that surface high pressure system, it is now expected to
be much stronger in the overnight deterministic model runs than
previously expected. Yesterday, the GFS and euro had a low-pressure
system developing along the gulf coast on Sunday, but this beefier
high pressure system is now expected to help push that system much
further off shore that originally expected (hooray!). But just when
you think we might be out of the woods, mother nature comes around
again (i told you last night that we can't have nice things).

At the far end of the forecast period, the GFS is now indicating a
strong cold front pushing through the area once again thanks to the
active pattern we're expected to have with a upper-level longwave
trough center over nearly all the lower 48. The GFS is also
indicating line of showers turning to snow for a large portion of
the forecast area. The euro is lagging behind with this system, but
is also starting to come in line. However, hold off on buying bread
and milk for the moment. Recent model solutions have been very
inconsistent with day 6-7 shortwaves rolling through the broader
longwave trough. At a certain point, models can only predict so many
systems in the future as small changes grow exponentially with
time. Therefore, there is little confidence of this coming to
fruition just yet, however, we will continue (as always) to
monitor the situation going forward.

Thiem

Aviation
12z update...

just some bkn high clouds to start out although some MVFR cigs
building east of csg.VFR should be the rule through the early
morning hours but thereafter, moisture from the south will move
into the terminals allowing for sct clouds to develop,
transitioning to a bknVFR deck by afternoon from SW to ne. With
moisture further increasing through the overnight period, will see
MVFR developing around 00z and ifr by 05z along with the
introduction of some -ra to the terminals. Winds will be on the
increase again today with low end gusts in store for atl.

Atl confidence... 12z update...

medium on -ra and ifr timing.

High on remaining elements.

Deese

Preliminary point temps pops
Athens 45 37 59 43 5 50 60 100
atlanta 44 41 59 39 10 50 90 100
blairsville 38 34 51 35 10 60 100 100
cartersville 45 40 57 36 5 50 100 100
columbus 52 49 67 42 10 30 80 100
gainesville 41 36 53 39 5 60 90 100
macon 51 46 68 47 10 40 50 90
rome 45 41 57 35 5 50 100 100
peachtree city 47 43 61 39 10 40 80 100
vidalia 55 50 72 54 10 30 20 90

Ffc watches warnings advisories
Winter weather advisory from 7 pm this evening to 4 am est
Wednesday for the following zones: lumpkin... Towns... Union...

white.

Short term... Deese
long term... .Thiem
aviation... Deese


Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Cobb County International Airport - McCollum Field, GA6 mi69 minESE 910.00 miFair30°F12°F49%1004.9 hPa
Cartersville Airport, GA12 mi64 minE 810.00 miFair31°F10°F43%1033.1 hPa
Marietta / Dobbins Air Force Base, GA13 mi61 minESE 1010.00 miPartly Cloudy29°F9°F43%1034 hPa
Fulton County Airport-Brown Field, GA23 mi64 minE 410.00 miFair31°F10°F43%1034.1 hPa
Atlanta, De Kalb-Peachtree Airport, GA23 mi64 minVar 610.00 miFair29°F10°F45%1035.3 hPa

Wind History from RYY (wind in knots)
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Last 24hrNW5NW65NW4NW75NW6N3NW4W4N53CalmCalmE3E74E6E5E6E6E7E9E11
G16
1 day agoNW13
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NW5NW635
2 days agoE11E8SE8
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Tide / Current Tables for
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Tide / Current Tables for
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Weather Map and Satellite Images
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wmap_A
GOES Local Image of Southeast    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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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Peachtree City, GA (7,2,3,4)
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Ground Weather Radar Station Atlanta, GA
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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.