Friday, December15, 2017 L-36.com


Marine Weather and Tides
Atlanta, GA

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 7:34AMSunset 5:32PM Friday December 15, 2017 10:16 PM EST (03:16 UTC) Moonrise 5:04AMMoonset 4:05PM Illumination 5% Phase: Waning Crescent; Moon at 27 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 Atlanta, GA
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location: 33.76, -84.42     debug


Area Discussion for - Peachtree City, GA
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Fxus62 kffc 152344
afdffc
area forecast discussion
national weather service peachtree city ga
644 pm est Fri dec 15 2017

Prev discussion issued 231 pm est Fri dec 15 2017
short term tonight through Saturday night ...

fairly amplified large scale pattern will continue through the short
term. Currently... Ridging persists across the rocky mtn states while
broad troughing exits across the eastern 2 3rds of the country. As
faster mid level flow continues across northern latitudes... A slow
moving closed low is meandering across western mexico. At the
sfc... High pressure is dominating most of the southern states in the
wake of a cold front draped from the carolina coast into the central
gulf.

For the remainder of today and through tonight... Pacific
moisture along the subtropical jet will continue to stream into the
area through the afternoon and into the evening hours as the mid
level low continues to fumble around western mexico. Most of this
will be in the form of mid and high clouds with some virga showing
up on local radar imagery. Consensus is that a vort ribbon stemming
from northern stream cyclonic energy will help push out the majority
of cloud cover through overnight as it passes from NW to se. Sfc
high pressure will also continue to build into the region overnight
as the cold front continue south. Tight pressure gradient between
sfc high and baroclinic response of sfc low off the carolina coast
will keep breezy conditions into the first part of the evening
tonight before the center of the high moves closer to the cwa.

For Saturday... Pesky mexico closed low will be kicked into western
tx as a digging trough dives into the socal baja area. This will
induce a short wave diabatic ridge across the southeast and make for
fairly mild temps as h5 heights rise noticeably. Although moisture
will surge north into the southern plains and lower ms valley... Sfc
high pressure will not move offshore until the beginning of the long
term. Therefore... Will stay dry and mild through Sat night with
lower level moisture gradually on the rise. A quiet short term then
gives way to an active long term.

Kovacik
long term Sunday through Friday ...

the GFS and euro continue to struggle on keeping run-to-run
consistency and consensus with each other from Monday onward with
extent of gulf moisture axis and possible shortwave influences
through Wednesday. They at least both agree on some less
instability present Sunday so have taken thunder chance out then,
though include in portions of mainly central ga for Mon tue. Will
continue high end chance to likely chance for widespread showers starting
from the NW Sunday then other areas thru tues, then limit to
slight chance pops Wed Thu given uncertainty. Oddly enough they
both agree on the return of a broad SW gulf moisture fetch by
Friday so have increased pops accordingly. Previous discussion
follows...

baker
prev discussion... Issued 321 am est Fri dec 15 2017
long term Saturday night through Thursday ...

the long term period begins as a transition one as high pressure
continues to push offshore of the carolinas and high amplitude mid
level trough begins to push east out of the 4 corners region.

Embedded shortwaves on the east side of this trough will move into
the tennessee valley Sat night and into Sunday. This will quickly
transition the nil pops early Sat night into likely rain chances
late Sunday. Given moisture and lift profile, would actually see a
large area of predominant showers but this is a good start this
far out. Given strength of the shortwave, it is likely we will see
some elevated thunder and perhaps even some surface based
instability. Will therefore continue to carry isolated thunder
chances in the grids.

With broad trough remaining west of the region through wed, would
expect disturbed pattern to continue into mid week although models
differ on the details. Have utilized a blend for this forecast
which keeps a zone of likely pops in transitioning south of the
region by Tue night into wed.

Another storm system on tap into late next week as we approach the
holiday with models actually in good agreement this far out.

Despite good agreement, run to run consistency has been all over
the place and will therefore keep pops at chance for now.

Deese

Aviation
00z update...

vfr conditions will prevail through the TAF period. Bkn cirrus
will tend to scatter out through early Saturday morning. Winds
will remain largely NW through midday Saturday, shifting more sw
by evening at atl area sites. Mcn csg winds may trend NE on
Saturday. Wind speeds near 10kts this evening will taper to 3-6
knots for the remainder of the period.

Atl confidence... 00z update...

high confidence all elements.

Rw

Preliminary point temps pops
Athens 30 55 36 58 0 0 5 30
atlanta 30 55 38 56 0 0 5 40
blairsville 23 53 31 53 0 0 10 60
cartersville 27 53 35 54 0 0 10 60
columbus 31 58 39 64 0 0 5 30
gainesville 30 54 37 53 0 0 5 40
macon 30 57 36 63 0 0 5 10
rome 26 54 34 52 0 0 10 60
peachtree city 29 56 36 59 0 0 5 40
vidalia 35 58 38 66 0 0 5 5

Ffc watches warnings advisories
None.

Short term... Rw
long term... .17
aviation... Rw


Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Fulton County Airport-Brown Field, GA5 mi23 minW 410.00 miFair32°F24°F73%1022.9 hPa
Atlanta, Hartsfield - Jackson Atlanta International Airport, GA7 mi24 minNW 710.00 miMostly Cloudy33°F25°F72%1023 hPa
Atlanta, De Kalb-Peachtree Airport, GA10 mi23 minWNW 510.00 miFair31°F21°F69%1023.4 hPa
Marietta / Dobbins Air Force Base, GA13 mi80 minW 710.00 miPartly Cloudy30°F21°F71%1023.1 hPa
Cobb County International Airport - McCollum Field, GA20 mi28 minNW 310.00 miFair31°F24°F76%994.6 hPa

Wind History from FTY (wind in knots)
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Last 24hrS4CalmCalmCalmCalmW3NW4CalmNW3NW4W4NW9W11NW10NW13
G20
NW10W11W6W6NW6NW43W3W4
1 day agoCalmSW3SW3SW4SW4SW3SW3CalmCalmCalmW3CalmW43S35SW54SW6S3SW4SW4SW4SW3
2 days agoN10NW12
G19
NW6NW10
G17
NW66NW9NW6W5W3W6NW3Calm5S10SW6W7SW8S9SW5SW4SW5SW5SW4

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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Weather Map
wmap_A
IR Satellite Image from GEOS
east_satellite

GOES Local Image of Southeast    EDIT
Geos

Wind Forecast for Peachtree City, GA (22,6,7,8)
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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.