Sunday, September27, 2020
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Marine Weather and Tides
Hardeeville, SC

Version 3.4
NOTICE
8/26/2020 The 7 day forecast is taking about 5 seconds to load but it will eventually load. NOAA is still working on it.
8/18/2020 NOAA continues to have trouble. Wind guest will occasionally be left off graphs. I am working with NOAA to resolve the issue.
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 7:15AMSunset 7:15PM Sunday September 27, 2020 3:39 AM EDT (07:39 UTC) Moonrise 4:23PMMoonset 2:10AM Illumination 76% Phase: Waxing Gibbous; Moon at 10 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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AMZ352 Waters From Edisto Beach Sc To Savannah Ga Out 20 Nm- 328 Am Edt Sun Sep 27 2020
Today..E winds 5 kt. Seas 1 to 2 ft. A chance of showers this afternoon.
Tonight..S winds 5 to 10 kt. Seas 1 to 2 ft. Showers likely with a slight chance of tstms in the evening, then a chance of showers after midnight.
Mon..E winds 5 to 10 kt. Seas 1 to 2 ft. A slight chance of tstms. A chance of showers in the morning, then showers likely in the afternoon.
Mon night..S winds 10 kt. Seas 2 to 3 ft. Showers likely with a slight chance of tstms.
Tue..S winds 10 to 15 kt. Seas 2 to 3 ft. Showers likely with a slight chance of tstms.
Tue night..SW winds 10 to 15 kt with gusts to 20 kt. Seas 2 to 3 ft. A slight chance of tstms. Showers likely.
Wed..W winds 15 kt. Seas 2 to 3 ft. A chance of showers.
Wed night..W winds 10 to 15 kt. Seas 2 to 3 ft. A slight chance of showers.
Thu..W winds 5 to 10 kt. Seas 2 ft.
Thu night..SW winds 5 to 10 kt. Seas 2 ft. Mariners are reminded that winds and seas higher in and near tstms.
AMZ300 328 Am Edt Sun Sep 27 2020
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. Weak high pressure offshore today. A warm front will lift north through the area late tonight into Monday. A cold front will shift through the region Tuesday into early Wednesday, followed by high pressure through late week.


7 Day Forecast for Marine Location Near Hardeeville, SC
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location: 32.3, -81.12     debug


Area Discussion for - Charleston, SC
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FXUS62 KCHS 270500 AFDCHS

Area Forecast Discussion National Weather Service Charleston SC 100 AM EDT Sun Sep 27 2020

SYNOPSIS. Weak high pressure will prevail tonight, before a warm front lifts north through the area late Sunday and Monday. A cold front will shift through the region late Tuesday into Wednesday, followed by high pressure through late next week.

NEAR TERM /UNTIL 6 AM THIS MORNING/. A northerly wind surge is currently working south along the coast early this morning. This feature looks to settle out near the Savannah River entrance over the next few hours. The best fog/stratus potential looks to remain around the periphery of the forecast area through sunrise with the highest chances for significant fog development occurring across McIntosh County, GA, where as much as 0.50" inches of rain fell in a localized area. Adjusted the fog forecast slightly to reflect going trends. In fact, there may be little to no fog/stratus development from Beaufort west to interior Southeast Georgia where 1000 hPA condensation pressure deficits are progged to remain rather high. Lowered overnight lows a few degrees adjacent to the CSRA per RAP/H3R blend and nudged them higher along the lower South Carolina coastal areas into Savannah Metro where the northeast wind surge will keep things a bit more mixed. No rain is expected through sunrise.

SHORT TERM /6 AM THIS MORNING THROUGH TUESDAY/. Sunday: Weak high pressure will slowly become replaced by a mid and upper level low that traverses across the Deep South, then across the southern Appalachians in a weakened state. the best DPVA and upper forcing with a nearby jet streak will remain off to the northwest of the region through much of the day, but does move into the area at night. Drier air does hang on through at least the first part of the day, but within a south to southwest flow out of the Gulf of Mexico, moisture advection increases in the afternoon. Model guidance has been inconsistent on how quickly showers will spread into the area, so we have held max PoP to 30 or 40% over southeast Georgia, and to 20% or less in South Carolina. Instability is rather minimal, so we don't show anything more than a slight chance of t- storms throughout. However, coverage will increase into the 30-50% range Sunday night, with better forcing and deeper moisture in place.

Fog and stratus will begin the day, perhaps even down to near the coast, before lifting into an extensive cumulus layer. Atop that will be thickening mid and high level clouds, leading o a mostly cloudy to overcast day. However, warm advection will still be able to boost max temps to 80-84F in the afternoon. Not yet certain on how much fog/stratus will occur Sunday night, so didn't add to the forecast. But considerable layered clouds will prevail, leading to min temps a few degrees either side of 70F.

Monday: A south to southwest flow will continue to advect deeper moisture across the region, featuring PWat in excess of 2inches. This occurs well ahead of a cold front advancing across the Central United States. While subtle height falls occur during the day, they become more pronounced at night as a closed low drops south through the upper and middle Mississippi Valley. This occurs in tandem with short waves skirting by to the south and east, another jet streak during Monday night, and increasing isentropic ascent. Scattered to numerous showers and scattered t-storms will prevail in this environment. The greatest coverage looks to be over Georgia during the day where the instability is a little better, then over the coastal corridor at night where there is stronger low level convergence. Similar to Sunday, warm advection will negate the widespread and thick cloud cover, while night time lows will be a degree or two warmer than the previous night.

Tuesday: An anomalous high amplitude trough will dig across the middle and lower Mississippi Valley, then through the Tennessee Valley and Deep South. Within the trough will be situated a deep closed low, and these features will force a cold front to approach from the west late in the day. Strong QG forcing and deep moisture will prevail in this dynamic atmosphere, leading to at least numerous showers and t-storms throughout the day. The greatest coverage looks to be near and east of I-95 in the morning where the best low level convergence occurs in tandem with a weak short wave brushing nearby. Then the better chances look to arrive to the west of I-95 in the afternoon, with the stronger forcing aloft with the approaching low, greater height falls and a stronger upper jet that moves into the Southeast. Temps should hit 80-83F within the warm advection regime, but this could change due to the elevated rain chances.

There appears to be at least some potential for severe weather given a highly sheared environment and the proximity to a surface low along the front that currently looks to push through northeast Georgia into the South Carolina upstate. On the negative side, lapse rates are poor and there is some stabilizing influences from the synoptic flow from off the Atlantic. Plus the morning convection could limit how much instability and CAPE will be able to occur. There is probably at least an isolated tornado risk given the amount of shear.

In addition, abundant deep layered moisture will allow for at least locally heavy rainfall where training and/or back building occurs. Given the antecedent wet conditions, it won't take much to generate a minor or moderate flooding concern.

LONG TERM /TUESDAY NIGHT THROUGH SATURDAY/. A cold front will advance across the area Tuesday night, producing at least scattered showers and thunderstorms along/near fropa before considerably drier high pressure spreads across the region in its wake Wednesday. A trailing mid/upper lvl low post fropa could produce few to scattered showers with any remaining moisture behind the front, but chances will likely decrease during the later half of Wednesday as the low advances further east and dry air spreads across the region from the west. Dry high pressure will then prevail at the sfc through late week while the area remains along the southern edge of a large longwave trough of low pressure extending across much of the East Conus. The pattern will favor noticeably cooler conditions during the second half of next week with highs generally peaking in the upper 70s Wednesday and Thursday, then low/mid 70s during the weekend. Overnight lows will also be some 10- 15 degrees colder than earlier in the week, dipping into the mid/upper 50s to around 60 degrees along the immediate coast.

AVIATION /06Z SUNDAY THROUGH THURSDAY/. It appears the greatest risk for widespread fog/stratus impacts will remain north and west of KCHS and south of KSAV through daybreak. With a weak north/northeast wind prevailing in the boundary layer, some low cigs could drift into KCHS prior to just before sunrise. This could briefly establish cigs in the 200-400 ft range, but this will have to be watched carefully. Right now, it appears the duration would be short if it occurs. Something similar could happen at KSAV with drainage influences possible off the Savannah River. Will carry TEMPO groups 10-12 for SCT002 to trend for possible low stratus. Significant fog appears unlikely at both sites given high condensation pressure deficits. Light rain is expected to break out from southwest to northeast late this afternoon and persist into this evening before shifting east. Vsbys look to average 3-6SM in this rain, heaviest at KCHS. Will show prevailing MVFR at KSAV 21-02z for now and keep vsbys right at low-end VFR at KCHS 23-03z. The risk for tstms look too low to justify a mention at this time.

Extended Aviation Outlook: Brief flight restrictions are possible Sunday night through Monday with showers and/or thunderstorms developing across the area. Periods of flight restrictions are possible Tuesday into early Wednesday, mainly as showers/thunderstorms shift across the area with a cold front. VFR conditions should then prevail by Wednesday afternoon with dry high pressure spreading across the region.

MARINE. Tonight: A weak pressure pattern will be in place resulting in fairly light and variable winds, generally becoming NW/N late. Wind speeds will remain below 10 knots with seas 1-3 feet on average. Will need to watch for the potential that some fog inland could at least move into the coastal waters late, especially in Charleston Harbor.

Sunday through Monday: Not much wind nor wave action through the period within a light pressure pattern. However, there is an increase in the coverage of showers and t-storms which will produce locally hazardous conditions.

Tuesday through Thursday: A strong cold front will approach from the west late Tuesday, advance through the local waters Tuesday night into early Wednesday, then gives way to continental high pressure from the west by Thursday. There is a small chance for a short duration Small Craft Advisory from just before the front to about 6- 12 hours in it's wake. But for the moment, conditions appear to fall just shy of any advisory thresholds. A greater concern will be the potential for the front to bring with it some strong or even severe t-storms.

EQUIPMENT. The KCLX radar is expected to be down through at least most of Monday due to equipment failure.

CHS WATCHES/WARNINGS/ADVISORIES. GA . None. SC . None. MARINE . None.



NEAR TERM . RJB SHORT TERM . LONG TERM . AVIATION . RJB MARINE . EQUIPMENT .


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FPKG1 - 8670870 - Fort Pulaski, GA 22 mi51 min ENE 2.9 G 4.1 73°F 75°F1015.7 hPa
41033 38 mi31 min E 5.8 G 7.8 74°F 77°F1014.7 hPa
ACXS1 - ACE Basin Reserve, SC 40 mi114 min Calm 70°F 1016 hPa69°F
SAXG1 - Sapelo Island Reserve, GA 62 mi99 min NNE 4.1 76°F 1015 hPa (-1.0)75°F

Wind History for Fort Pulaski, GA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Savannah-Hilton Head International Airport, GA12 mi46 minNNE 310.00 miFair70°F68°F93%1015.2 hPa
Hunter U. S. Army Airfield, GA19 mi43 minN 010.00 miFair71°F67°F89%1014.5 hPa
Hilton Head Island, Hilton Head Airport, SC23 mi44 minN 08.00 miOvercast70°F68°F94%1015.6 hPa

Link to 5 minute data for KSAV

Wind History from SAV (wind in knots)
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Last 24hrCalmCalmCalmN3NW3NE3N5N3N54NW7N5NW5CalmE7S6SW3N4N4NE5NE3CalmCalmN3
1 day agoSE8S7S4S6SE3S5S9S10S11SW9S13S10S8S9SE7S8SE5S5S4SE8SE8CalmCalmCalm
2 days agoCalmCalmCalmN4N3N3NE5E7E7SE7SE11SE9S11E11E10E10SE5SE8E9SE7SE7SE7SE13S11

Tide / Current Tables for Purrysburg Landing, Savannah River, South Carolina
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Purrysburg Landing
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Sun -- 03:00 AM EDT     0.34 feet Low Tide
Sun -- 03:10 AM EDT     Moonset
Sun -- 07:16 AM EDT     Sunrise
Sun -- 07:29 AM EDT     3.05 feet High Tide
Sun -- 03:13 PM EDT     0.33 feet Low Tide
Sun -- 05:23 PM EDT     Moonrise
Sun -- 07:13 PM EDT     Sunset
Sun -- 08:16 PM EDT     3.36 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.510.50.30.71.62.5332.82.41.91.410.60.30.51.32.233.33.332.6

Tide / Current Tables for Savannah River Entrance, Georgia Current
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Savannah River Entrance
Click for Map
Sun -- 12:26 AM EDT     0.00 knots Slack
Sun -- 03:04 AM EDT     1.72 knots Max Flood
Sun -- 03:10 AM EDT     Moonset
Sun -- 06:28 AM EDT     -0.00 knots Slack
Sun -- 07:15 AM EDT     Sunrise
Sun -- 10:09 AM EDT     -1.95 knots Max Ebb
Sun -- 12:38 PM EDT     0.01 knots Slack
Sun -- 03:50 PM EDT     1.97 knots Max Flood
Sun -- 05:21 PM EDT     Moonrise
Sun -- 07:12 PM EDT     Sunset
Sun -- 07:15 PM EDT     -0.00 knots Slack
Sun -- 10:44 PM EDT     -2.30 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.60.71.51.71.61.30.5-0.5-1.2-1.7-1.9-1.7-0.80.41.41.921.81.30.3-0.7-1.5-2.1-2.3

Weather Map
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wmap_A
GEOS Local Image of    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.
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Ground Weather Radar Station Charleston, SC
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