Sunday, May20, 2018 L-36.com


Marine Weather and Tides
Atlanta, GA

Version 3.4
What's New / NOTES
5/20/2018 -- NOAA is having problems with the data feed that I use to draw the graphs. They are aware of the issue and working to resolve it. Sometimes changing the location by about a mile will give a correct graph. 3/3/2018 - There is a new GOES Satellite for the east coast that required rewriting that part of the code. Please report any issues.

Sunrise 6:31AMSunset 8:36PM Sunday May 20, 2018 9:02 PM EDT (01:02 UTC) Moonrise 10:45AMMoonset 12:02AM Illumination 36% 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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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 210054
afdffc
area forecast discussion... Updated for aviation
national weather service peachtree city ga
850 pm edt Sun may 20 2018

Short term tonight through Monday night
Current radar loop shows a few lines of showers and thunderstorms
developing across southern and northern portion of our CWA this
afternoon. There are a few strong storms along these lines but
nothing has gone sever as of yet. Instability indices are very
strong for this time of year but there is very little shear for
these storm to work with. Pws are also very high ranging 1.4 to 2.0
through the short term across the state. As for the convective
activity today... We are not expecting much in the way of severe
storms as there is a weak upper level ridge that is persisting
across the region and should help to cap any storm development. A
weak upper low over the northeastern gulf will continue moving
slowly northwestward and become centered over al by Monday
afternoon. This lows movement will keep ga in a very moist pattern
with rain chances increasing Monday and into the extended forecast.

This will also increase cloud cover across the region keeping
temperatures mainly in the 70s and lower 80s across north and
central ga through Tuesday.

01

Long term Tuesday through Sunday
No significant changes seen in the overall, large-scale trends in
the medium-range models with this cycle. Region remains in a
generally wet pattern through the extended forecast period. Despite
moderate destabilization of the atmosphere with diurnal heating each
day, lack of a strong forcing mechanism and a weak, somewhat
disorganized wind profile will keep chances for anything other than
isolated severe thunderstorms quite low. However, ample precipitable
water will keep chances for locally heavy rainfall in the picture.

All-in-all, few changes made to the previous long term forecast
grids. See previous discussion below.

20
previous long term forecast discussion Monday night through
Saturday ...

really not expecting much of a pattern change through the extended
forecast period. The long term forecast period now begins Monday
night where a broad scale view of the mid levels reveals a weak
ridge of high pressure in place over the southeast and lower ms
valley as a deep closed low digs into the great basin region of the
western us. Despite favoring larger scale forcing for descent
underneath the SE ridge... 00z guidance depicts a weak area of mid
level low pressure under the ridge located across SE al. This
disturbance will likely allow for isolated to scattered
showers isolated rumbles of thunder to linger across the area late
into the night... ESP across southwest portions of the cwa. This low
is expected to slowly meander under the ridge over georgia Tuesday
and through Wednesday. Although this feature should supply some
degree of additional forcing for ascent for precip... Think overall
conditions will be largely diurnal with best coverage during the
afternoon and evening both Tuesday and Wednesday... With isolated
showers continuing into the overnight.

By Thursday... Evidence of the weak low becomes less defined with
more of a ridge influence in the mid and upper levels. Unfortunately
the lower level regime will remain largely unchanged as persistent
high pressure over the atlantic continues to advect a very moist
airmass into the region. This will continue the chance for afternoon
and evening thunderstorms albeit not quite as widespread.

By the end of the week and into the weekend... Discrepancy still
exists in regards to the development of low pressure across the
northern gulf. While both the 00z ec and GFS show some degree of the
remnants of georgia's early week area of low pressure retrograding
into the gulf and redeveloping... The ec shows a better influx of
moisture from the caribbean. Regardless... Both models continue to
depict the development of low pressure troughing in the northern
gulf. In addition... Does not really matter whether the system
becomes tropical or not... It needs to be understood that this system
would have excellent access to deep gulf moisture and would provide
another mechanism for moderate to heavy precip across the region.

Will need to carefully watch this system given the persistent wet
pattern leading up to its possible development.

Kovacik

Aviation
00z update...

showers and thunderstorms will continue to diminish. MostlyVFR
now but expect MVFR with some patchy ifr after 06z. Ceilings will
lift back toVFR by late morning Monday. Look for more showers and
thunderstorms to develop again Monday afternoon. Winds will stay
out of the SE through the period at 10kt or less.

Atl confidence... 00z update...

confidence medium on MVFR overnight.

High on all other elements.

41

Preliminary point temps pops
Athens 65 82 65 81 50 40 50 60
atlanta 67 79 67 80 50 50 50 60
blairsville 62 78 61 78 40 50 50 60
cartersville 66 81 65 82 40 50 50 60
columbus 68 81 68 83 40 70 50 70
gainesville 65 80 65 79 40 40 50 60
macon 67 82 68 82 40 50 50 70
rome 66 81 65 83 30 50 50 60
peachtree city 65 80 66 81 50 50 50 60
vidalia 68 82 68 83 30 40 50 60

Ffc watches warnings advisories
None.

Short term... 41
long term... .20
aviation... 41


Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Fulton County Airport-Brown Field, GA5 mi69 minSSE 510.00 miA Few Clouds70°F68°F93%1019.5 hPa
Atlanta, Hartsfield - Jackson Atlanta International Airport, GA7 mi70 minE 68.00 miLight Rain69°F68°F96%1020 hPa
Atlanta, De Kalb-Peachtree Airport, GA10 mi69 minVar 510.00 miThunderstorm69°F66°F90%1019.6 hPa
Marietta / Dobbins Air Force Base, GA13 mi66 minSE 510.00 miOvercast72°F64°F79%1019.6 hPa
Cobb County International Airport - McCollum Field, GA20 mi74 minESE 510.00 miFair74°F64°F74%992.1 hPa

Wind History from FTY (wind in knots)
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Last 24hrCalmSE3CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmN4CalmCalmCalmCalm3CalmSE9N6E6S5Calm
1 day agoSE5SE5SE7S5SE4S7S4S53S5S7S5S4SW3SW44W6SW76SW7W6SW4W3Calm
2 days agoS4NE3CalmCalmCalmSE4CalmCalmCalmCalmS4S5CalmS4CalmS6S8S9
G14
SE6SE10W5SE8SE8SE5

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.
target = "new">Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Peachtree City, GA (21,6,7,8)
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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.