Wednesday, April8, 2020
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Marine Weather and Tides
Acworth, GA

Version 3.4
NOTICE
12/16/2019 NOAA is having trouble with requests that include wind gusts. I am posting graphs without wind gusts until it gets fixed.
10/9/2019 Updated the Marine Zones.
9/4/2019 Fixed the weather maps due to NOAA moving them.
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.

Sunrise 7:14AMSunset 8:06PM Wednesday April 8, 2020 1:56 PM EDT (17:56 UTC) Moonrise 8:00PMMoonset 6:53AM Illumination 99% 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 081509 AFDFFC

Area Forecast Discussion National Weather Service Peachtree City GA 1109 AM EDT Wed Apr 8 2020


UPDATE.

Forecast looks to be on track so far with mainly some isolated showers and continued stratocu this morning. Still expecting convective initiation as early as 17z but main first wave of scattered storms most likely after 20z from south Atlanta Metro into central Georgia going into this evening, where some strong to severe intensities are possible. Hi-res solutions having some spread on timing with this wave and next one coming into the north overnight, but overall consensus looks like first wave exits the south by 03/04z and next enters the north shortly thereafter by 06/07z. SPC updated Day 1 outlook to have the far NW included in an Enhanced Risk and extended the Slight Risk farther south across all except east central GA. Still thinking main threats will be damaging winds, hail, and brief tornadoes. Previous discussion follows .

Baker

PREV DISCUSSION. /Issued 702 AM EDT Wed Apr 8 2020/

UPDATE FOR AVIATION .

PREV DISCUSSION . /Issued 419 AM EDT Wed Apr 8 2020/

SHORT TERM /Today through Thursday/ .

Models continue to struggle with precip chances with moisture in a flattening upper ridge. As the low level moisture increases today, so does the instability. The best instability will favor the western CWA and this is where the best precip chances will be during the day along with thunderstorm chances. A few strong or even severe storms will be possible later this afternoon over portions of west GA. Given the increase in instability along with deep layer shear and steep low level lapse rates, any severe storms could produce damaging winds and isolated large hail.

Precip and storm chances will diminish during the evening.

The main concern then will be a cold front forecast to move into N GA late tonight and across the area on Thursday with an associated short wave trough. SPC has highlighted N GA and a large portion of central GA with a slight risk for severe thunderstorms. The main hazard will be damaging winds and large hail. A tornado threat will also be possible.

The risk for any severe weather looks to diminish quickly early Thursday as the upper dynamics races away from the area. Rain and storm chances will be ending quickly followed by clearing skies and increased winds behind the front. A wind advisory will likely be needed for some of the area.

BDL

LONG TERM /Thursday Night through Tuesday/.

The frontal passage on Thursday will begin to dry things out in the forecast area, but a weak secondary cold front being pushed in from a strong surface high pressure system moving into the Ozarks will be the catalyst to drop dewpoints in the forecast area into the upper- 20s for north Georgia and lower-30s for central Georgia as PWATs drop to below a quarter of an inch. The type of setup may normally lead to raised fire weather concerns, but that will be highly dependent on how much rainfall we receive from the systems in the coming days and how strong the wind speeds are decently removed from the high pressure center. By Saturday morning the high pressure system will be moving across the Carolinas with the approach of a stronger storm system on to start the next week .

Model guidance began converging last night with the next storm system as a potential catalytic shortwave came onshore and began to be better sampled. Synoptically, a cutoff low pressure over Southern California will be rejoining the broader mid-latitude jet stream to begin the long term period, and by Saturday Night into Sunday will manifest into a deep shortwave in the Southern Plains and an occluded surface low across the Ozarks. The exact evolution of this system is still TBD, but generally, we're expecting the surface low to quickly migrate northward with a significant drop in pressure, with rapid cyclogenesis along a baroclinic boundary in the Southeastern CONUS. This forming cyclone, fueled by a duel- jetstream pattern which will significantly aid lift in the region. The combination of lift, instability, speed shear and directional shear will pose a threat for severe storms but the exact mode and hazards are too far out to determine just yet. One hazard that seems certain though in a flooding risk with an axis of PWATs between 1.5-2 inches likely somewhere through the forecast area and widespread rainfall accumulations between 2-3.5 inches expected throughout the forecast area, with locally higher values likely where lift focuses itself.

This system is likely to exit the region sometime on Monday with some question as to exact timing as a very broad longwave trough develops across the majority of the CONUS. Near the surface a weaker secondary front, again mainly forced into the area by a deeper Canadian High pressure system, look to come through the area on Monday afternoon/night. With limited moisture in the wake of the late weekend system, this front will likely just act to dry the area out headed into the middle of the week.

Thiem

AVIATION. 12Z UPDATE . LIFR/IFR ceilings are expected to improve to MVFR then VFR through the day. Potential for mainly light showers this morning and showers and thunderstorms this afternoon. Surface winds mainly west increasing to 8-12 kts with some gusts to 20 kts. Potential for IFR-MVFR ceilings overnight with showers and storms late for north GA.

//ATL CONFIDENCE . 12Z UPDATE . High confidence to start but Medium confidence for ceilings after 15z. Low confidence for storms affecting the airfield.

BDL

PRELIMINARY POINT TEMPS/POPS. Athens 83 64 79 50 / 20 30 30 0 Atlanta 81 65 76 49 / 40 30 30 0 Blairsville 77 57 66 40 / 30 70 40 0 Cartersville 81 62 73 45 / 40 50 30 0 Columbus 81 67 83 53 / 60 40 20 10 Gainesville 80 63 74 47 / 30 40 30 0 Macon 83 66 84 53 / 50 30 20 10 Rome 81 62 72 45 / 40 60 30 0 Peachtree City 82 64 78 49 / 50 30 30 0 Vidalia 85 68 87 57 / 40 30 20 5

FFC WATCHES/WARNINGS/ADVISORIES. NONE.

SHORT TERM . BDL/Baker LONG TERM . Thiem AVIATION . BDL


Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Cobb County International Airport - McCollum Field, GA6 mi66 minNW 610.00 miMostly Cloudy73°F64°F76%984.9 hPa
Cartersville Airport, GA12 mi63 minVar 310.00 miOvercast77°F66°F69%1011.5 hPa
Marietta / Dobbins Air Force Base, GA13 mi60 minW 88.00 miMostly Cloudy72°F64°F77%1012 hPa
Dallas Paulding County Regional Airport, GA22 mi61 minW 67.00 miOvercast72°F64°F78%1013.2 hPa
Fulton County Airport-Brown Field, GA23 mi63 minW 610.00 miOvercast73°F64°F76%1011.9 hPa
Atlanta, De Kalb-Peachtree Airport, GA23 mi63 minNW 710.00 miOvercast72°F64°F79%1011.6 hPa

Link to 5 minute data for KRYY

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Last 24hrN7W8SW10W12
G18
S4W6SW5SW5W3CalmCalmCalmCalmCalmW3W4W4W6SW5W7W8W8NW6W11
G16
1 day agoNW8NW8N7W8SW8SW4SW3SW3SW3CalmSW3CalmCalmCalmCalmCalmCalmCalmCalmW5W8W9W8W9
2 days agoCalmSE3SW43W4CalmCalmCalmCalmCalmCalmSW3SW5CalmCalmW4W4CalmCalmW34--W10W10

Tide / Current Tables for
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Tide / Current Tables for
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Weather Map
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wmap_A
GEOS 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.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Peachtree City, GA (13,3,4,5)
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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 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 numerous 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.