Sunday, March18, 2018

Marine Weather and Tides
Hiawassee, GA

Version 3.4
What's New / NOTES
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.
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.

Sunrise 7:39AMSunset 7:47PM Sunday March 18, 2018 7:18 PM EDT (23:18 UTC) Moonrise 7:34AMMoonset 8:02PM Illumination 5% Phase: Waxing Crescent; Moon at 2 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
    EDIT      (on/off)   Help
7 Day Forecast for Marine Location Near Hiawassee, GA
   Hourly   EDIT   Help
location: 34.92, -83.72     debug

Area Discussion for - Peachtree City, GA
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
Fxus62 kffc 181920
area forecast discussion
national weather service peachtree city ga
320 pm edt Sun mar 18 2018

Short term tonight through Monday night
Regional radar view shows considerable activity presently over sw
alabama riding the energy provided by embedded shortwave in
largely westerly flow aloft. Expect the most robust of this
activity to ride along the best instability axis this evening
which is roughly from columbus to vidalia and points southward
currently. Some CAPE values just south of the area running close
to 1500 j kg so some strong to severe activity not out of the
question and SPC slight risk for just a few counties looks on

For the remainder of the overnight period, rain chances will
increase rapidly as istentropic processes combine with shortwaves
to produce widespread rain with embedded thunderstorms for
southern sections. Previous model runs had indicated the potential
for some isolated flooding across the southern tier. Latest runs
though indicate around an inch to an inch and a quarter which
central ga should be able to handle through the overnight period.

As far as severe potential into the overnight, developing easterly
flow should inhibit expansion of instability axis and even
elevated CAPE looks manageable through 12z Monday so prospects
look low at this time for any robust convection.

Very difficult call for Monday afternoon as some models indicate
low clouds and stable conditions will stay with the entire area
for the balance of the day. But there is a very sharp instability
gradient with in excess of 2000 j?kg just along and south of our
southern CWA border. Shear not the best but sufficient for some
rotating discreet cells should activity be able to develop across
the southern tier.

Final wave which looks to be of the most concern will be Monday
evening into the first part of the overnight period. Even
instability associated with this feature is less in the models
than this time a few days ago. But with positive CAPE values, feel
activity that develops over alabama will be able to maintain
itself over the local area and take advantage of very strong shear
values to produce strong to severe storms. Pretty much everything
on the table for this one including damaging winds, isolated
tornadoes and large hail. Some hi res guidance wants to weaken
this feature as it gets south of the metro but thinking this may
be premature given similar events in the past and will advertise
severe risk well into central ga for this one.

long term Tuesday through Sunday ...

mainly only tweaks to the long term based on the latest guidance.

Thunderstorm chances will be over portions of central ga mainly
e and S of mcn on Tuesday and then just chances for showers
into Wednesday favoring N and E ga.

previous discussion...

as a surface low moves across tennessee Monday evening, widespread
thunderstorms will be ongoing and rapidly progressing eastward
Monday night ahead of the attendant cold front. The severe
thunderstorm threat will have increased by this point with
substantial surface instability and favorable shear in place.

Supercellular convection with the threat for large hail, damaging
winds, and tornadoes will be a concern during the evening hours. The
highest severe threat will exist across portions of north and
central georgia outside of the influence of the wedge which, though
retreating, will help limit instability across northeast georgia.

The overall severe threat will then quickly diminish from the
northwest as the cold front sweeps southeastward through early
Monday morning.

Additional showers will return on Tuesday as a followup upper wave
and cold front push into the region. Northwest winds will pickup
late Tuesday behind this secondary cold front, and significantly
cooler temperatures will advect into the state. Before the light
rain ends, some brief rain snow mix may be observed across the high
elevations of far north georgia during the early morning hours
Wednesday; however, accumulations or impacts would not be a concern.

Wednesday will bring clearing skies and below average temperatures
with a sunny and cool Thursday also on tap. Temperatures will
rebound by Friday with the next chance of rain likely holding off
until Saturday morning at the earliest.


Aviation 18z update... Challenging forecast as we have three
potential waves of precipitation moving across the terminals.

Fortunately, it looks as though the third wave is now delayed
enough to be just outside the atl TAF cycle. Prior to this, we
will be dealing with some developing CIGS as well with bknVFR
arriving later this evening... Transitioning to MVFR around 08z and
quickly to ifr early Monday morning. Light rain will accompany
this as well for all sites although will need to monitor for shra
at csg and mcn with tsra not out of the question either this
evening. Prob30 slated for atl aft 18z Mon although as
mentioned... Majority should be after 00z.

Atl confidence... 18z update...

medium on tsra chances and ifr duration mon.

High on remaining elements.


Preliminary point temps pops
Athens 54 65 54 70 80 60 100 40
atlanta 55 68 54 67 90 50 100 40
blairsville 49 61 47 62 70 60 100 50
cartersville 53 69 51 66 80 80 100 50
columbus 58 74 58 73 100 40 80 30
gainesville 52 62 52 67 70 60 100 50
macon 57 72 59 75 100 60 60 50
rome 53 69 51 64 80 80 100 50
peachtree city 55 71 54 69 90 40 100 40
vidalia 59 73 63 77 90 60 40 60

Ffc watches warnings advisories

Short term... Deese
long term... .Bdl
aviation... Deese

Weather Reporting Stations
   EDIT       (on/off)   Help   NOTE: Click on distance to see the station location on a map

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Andrews-Murphy Airport, NC20 mi44 minW 410.00 miOvercast65°F41°F43%1010.5 hPa

Wind History from RHP (wind in knots)
Last 24hrSW7
1 day agoW7CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmE3CalmW3CalmW9SW8
2 days agoW10

Tide / Current Tables for
   EDIT   RT Ports Option   Weekend mode (on/off)   (on/off)   Help
Tide / Current Tables for
   EDIT      (on/off)   Help
Weather Map and Satellite Images
       (on/off)   HelpWeather Map
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 (19,4,5,8)
      (on/off)   Help

Ground Weather Radar Station Greer, SC
   (on/off)   Help
weather_mapweather_map weather_map

Ad by Google

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.