Wednesday, February20, 2019

Marine Weather and Tides
Marietta, 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 7:16AMSunset 6:27PM Wednesday February 20, 2019 1:54 AM EST (06:54 UTC) Moonrise 7:52PMMoonset 8:11AM Illumination 99% Phase: Full Moon; 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 Marietta, GA
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location: 34, -84.47     debug

Area Discussion for - Peachtree City, GA
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Fxus62 kffc 200546
area forecast discussion
national weather service peachtree city ga
1246 am est Wed feb 20 2019

Updated for the 06z aviation discussion.

Prev discussion issued 959 pm est Tue feb 19 2019

has been another active evening across the forecast area as
another area of frontogentic forcing and strong isentropic lift
allowed for banded convection at times. In addition, with such low
freezing levels, was not difficult at all to get hail with the
convection, the latest case being the cluster that move through
dade county. Things have settled down now and expect a quieter
night with rain still around but forcing less. Temps now safely
above freezing across the NE mountains but not by much. Models
agree in keeping outside any freezing rain thresholds overnight
but will certainly bear watching. Went ahead and edited pops for
the Wed timeframe keeping lower pops for all but the far northern
sections until prefrontal activity moves in toward evening.

prev discussion... Issued 708 pm est Tue feb 19 2019
prev discussion... Issued 258 pm est Tue feb 19 2019
afternoon forecast package...

short term tonight through Wednesday night ...

showers and isolated thunderstorms mainly across north and portions
of central ga as good east to southeasterly flow continues across the
area. The increased easterly flow is helping to push the high
pressure wedge down into our area as the axis of highest QPF looks
to stay north and west of our area. With rain expected to continue
into the extended periods we are still looking for some flooding
across N ga with 6 day totals in the 3-6 inch range. Have added a
few more counties into the current flood watch and will keep it
going through Saturday morning. The watch extends from haralson... To
cherokee... To white counties and all areas north of that line. Winds
will be elevated and gusty at times tonight and Wednesday with some
places at the higher elevations gusting to around 30kts.

Temperatures... Especially under the wedge will stay a bit cool with
lows tonight in the 30s and highs in the 40s wed. Locations not
under the influence of the wedge will see temps get up into the 60s
and 70s Wednesday which will be mainly across central portions of
the state.

long term Thursday through Tuesday ...

overall, only minimal changes to the extended period. The only
addition is another wedge front system that will move into the
area Friday night into Saturday as a strong new england surface
high pressure quickly moves off into the atlantic. This extra lift
could further enhance rainfall totals for north georgia during
that time frame. Otherwise, the preceding discussion follows.

Following this continuous bout of rain through Sunday, the next
wave looks just as strong and begins to move into the area on
Monday. A fairly active pattern looks likely afterwards with low
pressure waves causing trouble in the forecast area every few

prev discussion... Issued 635 am est Tue feb 19 2019
long term Wednesday night through Monday ...

the long term period picks up with another period of possible heavy
rainfall late Wednesday as the wedge breaks down and a cold front
pushes towards the area. Current models don't show the front making
much progress into the area before becoming more parallel to the
flow and stalling. With the front stalled somewhere in the
vicinity, likely to categorical pops have been included for
northern georgia through Saturday as multiple waves of
precipitation move through the area. With instability present,
thunder has also been included for multiple days of the forecast.

Also, with such high pw values forecast Wednesday through the
rest of the long term, heavy rain is expected at times over
multiple days continuing concerns for flash flooding and river
flooding. Portions of northwestern ga already has a few rivers in
flood. The flood watch is still in effect for portions of
northeast georgia through early [Saturday]. Make sure to stay
updated to the forecast for any changes to the watch.

The next more organized system looks to impact the area late
Saturday into Sunday as a surface low develops across the midwest
and pushes a cold front into the state on Sunday. With good
instability across central georgia and high pw values, this system
will bring another round of heavy rain and thunderstorms to the

Overall, with the bulk of the precipitation expected to fall in
the short term, current QPF totals from Thursday through Sunday is
about 1 to 3+ inches with the highest amounts across northern
georgia. For more information on the excessive rainfall refer to
the latest esf. Temperatures through the extended are mostly above
average, with highs generally in the 60s and 70s with lows in the
40s to lower 60s. Some areas are even pushing low 80s across
central georgia through the weekend.


06z update...

a mix of ifr lifr CIGS will continue through the forecast. Winds
will be easterly and gusty early this morning, diminishing after
12z but remain mainly east through this evening. Winds will become
south to southwest tonight as the warm front lifts north of
atl ahn. Best chances of rain will be north of atl ahn, however as
the cold front approaches tonight, chances of rain will increase.

There is a risk of tsra this afternoon and tonight, however risk
is too low to mention in the taf.

Atl confidence... 06z update...

medium confidence.


Preliminary point temps pops
Athens 48 46 65 53 60 60 60 60
atlanta 53 51 64 54 50 70 60 60
blairsville 47 47 61 50 70 80 80 60
cartersville 52 51 60 51 60 80 70 60
columbus 65 62 74 61 40 50 50 50
gainesville 45 45 63 52 60 80 70 60
macon 60 58 75 60 40 30 50 50
rome 53 51 60 50 80 90 70 60
peachtree city 57 54 66 54 50 60 60 60
vidalia 70 62 80 63 40 10 30 30

Ffc watches warnings advisories
Flood watch through Saturday morning for the following zones:
bartow... Catoosa... Chattooga... Cherokee... Dade... Dawson...

fannin... Floyd... Gilmer... Gordon... Haralson... Lumpkin... Murray...

paulding... Pickens... Polk... Towns... Union... Walker... White...


Wind advisory until 7 am est this morning for the following
zones: catoosa... Chattooga... Dade... Dawson... Fannin... Floyd...

gilmer... Gordon... Lumpkin... Murray... Pickens... Towns... Union...

walker... White... Whitfield.

Short term... 17
long term... .Reaves
aviation... 17

Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Marietta / Dobbins Air Force Base, GA6 mi59 minE 16 G 2110.00 miOvercast39°F37°F93%1025.1 hPa
Cobb County International Airport - McCollum Field, GA7 mi67 minE 14 G 2310.00 miRain38°F37°F97%996.7 hPa
Atlanta, De Kalb-Peachtree Airport, GA12 mi62 minE 9 G 176.00 miLight Rain Fog/Mist38°F36°F93%1026.3 hPa
Fulton County Airport-Brown Field, GA15 mi62 minE 910.00 miLight Rain41°F39°F93%1025.2 hPa
Cartersville Airport, GA22 mi62 minESE 13 G 267.00 miOvercast39°F37°F93%1023.3 hPa
Atlanta, Hartsfield - Jackson Atlanta International Airport, GA24 mi63 minESE 14 G 228.00 miLight Rain41°F37°F86%1025.2 hPa

Wind History from MGE (wind in knots)
Last 24hrNW6CalmN7N5N6NE3NE4NE5E8E7E7E7E9
1 day ago----------NW10NW10NW10
2 days agoE3CalmE4E7E8E7E8E9E5E5E5E5E5E9E9E7E6E7E6N5E7Calm----

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Weather Map and Satellite Images
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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 Peachtree City, GA (1,6,7,8)
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Ground Weather Radar Station Atlanta, GA
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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 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 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.