Thursday, July29, 2021
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Marine Weather and Tides
Hiawassee, GA

Version 3.4
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3/30/2021 -- ANZ330 has been split into ANZ331 and ANZ332. Click EDIT in Marine Forecast and select your new zone.
1/26/2021 -- The West Coast Satellite images havd been updated. They now use GEOS-17.
1/1/2021 -- The 7 day forecast are now working well. Thank you NOAA for your support.

Sunrise 6:43AMSunset 8:40PM Thursday July 29, 2021 3:52 AM EDT (07:52 UTC) Moonrise 11:16PMMoonset 11:16AM Illumination 76% Phase: Waning Gibbous; Moon at 20 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 Hiawassee, GA
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location: 34.92, -83.72     debug


Area Discussion for - Peachtree City, GA
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FXUS62 KFFC 290605 AAA AFDFFC

Area Forecast Discussion . UPDATED National Weather Service Peachtree City GA 205 AM EDT Thu Jul 29 2021


. 06Z Aviation Area Forecast Discussion .

PREV DISCUSSION. /Issued 734 PM EDT Wed Jul 28 2021/

UPDATE . Afternoon thunderstorm coverage has dwindled or moved out of the CWA with only a few lingering storms in and around the CSG area and pockets of north Georgia. Expect the dying trend to continue over the next hour or so, and may need to add back in PoPs to cover residual activity. Otherwise, no significant changes are expected until the morning forecast package.

31

PREV DISCUSSION . /Issued 321 PM EDT Wed Jul 28 2021/

SHORT TERM /Tonight through Thursday Night/ .

High pressure aloft will be nudging into portions of the area today, bringing some drier air to portions of northern Georgia. This will mean slim chances for showers and thunderstorms across northern Georgia with chances for showers and thunderstorms across central Georgia this afternoon and evening. Temperatures are expected to heat up quickly with forecast high temperatures in the mid to upper 90s across northern Georgia with lower 90s further south. We don't have a Heat Advisory in effect this afternoon, but some isolated spots across central Georgia will likely reach heat index values around 105 degrees. Regardless, those who will be outside should make sure to take precautions against the heat and practice good heat safety. Overnight temperatures are forecast to be in the 60s across far NE GA with 70s elsewhere.

By Thursday afternoon, mid level high pressure will have pushed enough drier air into the area to nearly eliminate pops across the area aside from a slight chance of showers and thunderstorms across the far southern tier. High temperatures on Thursday will be some of the warmest temperatures we have seen recently with widespread upper 90s expected across the area. As of the current forecast, there are some isolated spots with heat index values around 105 degrees but we aren't meeting the criteria widespread, so will hold off on any Heat Advisory issuance. We will continue to monitor heat index values if it becomes necessary.

Reaves

LONG TERM /Friday through Wednesday/ .

Northern hemisphere is locked into a very stagnant overall long wave pattern with numerous omega and rex blocks located throughout the hemisphere in the long term forecast. A ridge is expected to remain over the west coast and continue to amplify throughout the entirety of the long term forecast. Amplification of that ridge will allow for similar amplification of a broad trough located over the eastern CONUS. Several shortwaves associated with PV anomalies will rotate through this as it amplifies, bringing with them attendant sfc cyclones and "cold" fronts, with big emphasis on the quotes for this time of year.

Friday looks to be yet another warm day in our streak of warm days. A shortwave rotates through the base of the large eastern trough, but trough is too far north and cooler air noted at 925mb stalls before reaching the CWA. Airmass in place over the CWA will already be primed in many ways for heat after days of little movement. Subsidence is noted through a large portion of the column in model based soundings with a deep mixed layer at the surface, with little in the way of cloud cover expected, all recipes for very warm temps. Ample moisture is expected to be in place, which will only exacerbate heat indices. Saturday looks to be similar as the next shortwave axis does not push by until Sunday morning. Highs on each day look to push into the mid 90s in north GA and the metro to even the 100s across central GA, bringing heat indices well into the 100s. Both these days will need to be monitored for potential heat advisory issuances, with the most likely areas being across central GA, especially given antecedent conditions and lows only falling into the mid 70s.

A few caveats to consider with this heat - the first is that longer range models can struggle to properly mix out the boundary layer, so moisture may not be as "vigorous" as what is currently projected. This would aid in keeping our overall "feels like" temperatures down. Another is potential rainfall and cloud cover, as it is well known that global guidance can struggle with our summertime diurnal convection. With the moisture that will be around, and several days of mixing, Saturday may be the most likely of these two days to see some afternoon storms pop. Even if these do occur, it will still be very warm and humid, and will have been for several days, so the messaging around the heat really shouldn't change a whole lot, just the actual size of the numbers.

Sunday sees front push into the area, bringing with it some of the best chances for rainfall, which models are in very good agreement about. With this will come a relief from heat in north GA, though central GA may have one last day to suffer with temperatures "only" reaching into the mid 90s until rain/cloud cover rolls in. A bit of a pattern change, at least for our area, may be in store after, as we begin to get more of a southwestern flow aloft as shortwave goes by. On Monday, positive PV anomaly within the broad eastern trough digs into the eastern CONUS which will help keep our rain chances around with aforementioned southwestern flow as well as broader ascent. Models have a surprising amount of agreement on the evolution beyond this, with wave break occurring on western CONUS ridge that, combined with convectively amplifying ridge downstream of the PV anomaly, "pinch" the anomaly off, creating a cut-off low just to the west of the CONUS. This pattern/placement of the low would effectively open the gulf moisture hose, bringing plenty of rain chances with it. Still some uncertainty, so did nudge down NBM based PoPs on Tuesday, and have mixed feelings about 80 PoPs on Monday

Lusk

AVIATION. 06Z Update . Other than some patchy MVFR fog at KMCN and KCSG, VFR conditions expected thru the fcst. Any SHRA/TSRA will remain well south of the forecast points today and tonight. Sfc winds light/variable becoming W-NW 4-6 kts after 15Z then light/variable after 00Z.

//ATL Confidence . 06Z Update . High confidence on all elements.

SNELSON

PRELIMINARY POINT TEMPS/POPS. Athens 96 74 98 75 / 5 5 20 5 Atlanta 96 75 97 76 / 5 0 20 5 Blairsville 91 69 90 67 / 5 5 30 0 Cartersville 97 73 98 73 / 0 0 20 0 Columbus 97 75 100 78 / 10 5 10 5 Gainesville 95 74 96 74 / 0 5 20 0 Macon 97 74 100 77 / 5 5 10 5 Rome 98 73 98 74 / 0 0 30 0 Peachtree City 97 73 98 76 / 5 0 20 5 Vidalia 94 76 98 78 / 10 5 10 5

FFC WATCHES/WARNINGS/ADVISORIES. NONE.

SHORT TERM . SNELSON LONG TERM . 28 AVIATION . SNELSON


Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Andrews-Murphy Airport, NC20 mi57 minN 07.00 miFair62°F62°F100%1019 hPa

Link to 5 minute data for KRHP

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Last 24hrCalmCalmCalmCalmCalmCalmCalmCalmE4CalmCalmCalmN3N6N3NE3CalmCalmCalmCalmCalmCalmCalmCalm
1 day agoCalmCalmCalmCalmCalmCalm----CalmCalmS3CalmCalmS5SE3CalmCalmCalmCalmCalmCalmCalmCalmCalm
2 days agoCalmCalmCalmCalmCalmCalmCalmW4CalmW4N12
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