Thursday, February27, 2020
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Marine Weather and Tides
Port Royal, SC

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 6:51AMSunset 6:19PM Thursday February 27, 2020 8:52 AM EST (13:52 UTC) Moonrise 9:12AMMoonset 9:58PM Illumination 16% Phase: Waxing Crescent; Moon at 4 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- 554 Am Est Thu Feb 27 2020
.small craft advisory in effect until 1 pm est this afternoon...
Today..NW winds 20 to 25 kt with gusts to 30 kt, diminishing to 15 to 20 kt. Seas 4 to 5 ft, except 2 to 3 ft near the immediate coast, subsiding to 2 to 3 ft throughout.
Tonight..NW winds 10 to 15 kt. Seas 2 ft.
Fri..NW winds 10 to 15 kt, becoming W in the afternoon. Seas 2 to 3 ft.
Fri night..W winds 15 to 20 kt. Seas 3 to 4 ft.
Sat..W winds 15 to 20 kt with gusts to 25 kt. Seas 3 to 4 ft, subsiding to 2 to 3 ft.
Sat night..NW winds 15 to 20 kt, diminishing to 10 to 15 kt after midnight. Seas 2 to 3 ft.
Sun..W winds 5 kt. Seas 2 ft.
Sun night..SW winds 10 kt. Seas 2 ft.
Mon..SW winds 10 kt. Seas 2 ft.
Mon night..S winds 10 to 15 kt. Seas 3 to 4 ft.
AMZ300 554 Am Est Thu Feb 27 2020
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. High pressure will prevail through Friday, with a weak and dry cold front expected Friday night and early Saturday. High pressure will again prevail into early next week. A cold front could approach during the middle of next week.


7 Day Forecast for Marine Location Near Port Royal town, SC
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location: 32.33, -80.47     debug


Area Discussion for - Charleston, SC
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FXUS62 KCHS 271054 AFDCHS

Area Forecast Discussion National Weather Service Charleston SC 554 AM EST Thu Feb 27 2020

SYNOPSIS. High pressure will prevail through Friday, with a weak and dry cold front expected Friday night and early Saturday. High pressure will again prevail into early next week. A cold front could approach during the middle of next week.

NEAR TERM /UNTIL 6 PM THIS EVENING/. No changes were needed for the sunrise update.

The cold front is now well out into the Atlantic and high pressure is steadily building in from the west. A deep, cyclonic flow will remain in tact across the Eastern United States within a broad, longwave trough, but dry/chilly conditions will prevail with the region under the influence of strong high pressure to the west. Intense low-level cold air advection will gradually wane during the day with H8 temperatures poised to recover from -2 to -4C to only about 0 to -2C. This will yield a considerably colder day compared the last several despite full insolation. An increasingly downslope dominated flow in the 925-700 hPa layer will help to moderate temperatures somewhat, but still expect highs to only warm into the mid-upper 50s, or about 10 degrees below normal for late February. Gusty west to northwest winds will make it feel cooler. An extensive field of stratocumulus noted across northwest Georgia through central Georgia should erode as it moves southeast and encounters the corridor of strongest subsident, downslope flow from off the southern Appalachians.

Lake Winds: Observations from Pinopolis and the WeatherFlow sensors at Shutes Folly and Fort Sumter in the Charleston Harbor suggest a pronounced wind surge is ongoing on Lake Moultrie early this morning. Winds are on the order of 20-25 kt with gusts as high as 30 kt and waves are likely running in the 2-3 ft range, mainly across the central and eastern portions of the lake. Winds will steadily diminish after sunrise, but it may very well take until early afternoon for gusts to fall below 25 kt. A Lake Wind Advisory remains in effect for Lake Moultrie until late morning, but it may need to be extended into the early afternoon depending on how quickly winds begin to wane with the weakening of post-frontal cold air advection.

SHORT TERM /6 PM THIS EVENING THROUGH SUNDAY/. Tonight: Strong high pressure over central Texas will hold its influence on the region tonight as it propagates southeast into the northwestern Gulf of Mexico. With the center of the anticyclone forecast to remain so far to the west and southwest, there looks to be enough of a lingering pressure gradient across the Southeast U.S. to prevent a full decoupling of the boundary layer overnight, except in the most sheltered spots. Lows will drop to near or just below freezing for many areas away from the coast with mid-upper 30s at the beaches and locations immediately adjacent to larger rivers, the Santee- Cooper lakes, harbors, and sounds. A few upper 20s can not be completely ruled out in sheltered spots (noted the 27/00z GFS CO-OP guidance showing 28 at Allendale).

Friday through Sunday: A closed upper level low across Quebec, Canada on Friday shifts into northern maine and New Brunswick by late Saturday, then finally through Nova Scotia Sunday. Our area will lie under the broad trough and associated cyclonic circulation around this feature late this week, before the the trough moves into the Atlantic late Saturday and Sunday, allowing for ridging to move in from the west. At the surface, high pressure along the coast of southeast Texas during the beginning of the period travels across the northern Gulf of Mexico at the start of the weekend, reaching overhead on Sunday. A dry atmosphere, and large scale subsidence will promote rainfree conditions all three days, despite a weak cold front that pushes through Friday night and early Saturday.

Temps will be far below climo Friday into early Sunday, with the 850 mb 0C isotherm near or into northern Florida. Warm advection however begins on Sunday, and that along with rising heights and the air mass moderating, will allow for temps back near normal for daytime highs.

The most important aspect of the upcoming short term forecast is the start of our Frost/Freeze program that begins again for the spring as of March 1st. Excellent radiational cooling will transpire for Saturday night into early Sunday morning, with the potential for a freeze along our northwest tier of counties, plus scattered to widespread frost in locations near and west of US-17. A Freeze Warning and/or a Frost Advisory will be required at a later time for this upcoming cold weather event.

LONG TERM /SUNDAY NIGHT THROUGH WEDNESDAY/. Quasi-zonal flow or flat ridging will prevail aloft early next week, as an upper low/trough moves from the Southwest and northern Mexico toward the Rio Grande Valley Tuesday. That feature dampens out Wednesday, before a phased trough develops over the central states and heads towards the Appalachians next Thursday. Meanwhile, surface high pressure will cover much of the southwest and west Atlantic, which holds back an upstream cold front until late in the forecast period. There is considerable warm advection in advance of the front, which leads to temps climbing far above normal. The main forecast challenge will be the timing of the next front, but considerable moisture will eventually return in association with the front. With significant forcing for ascent and strong shear, there is a concern for severe weather or at least t-storms late in the current forecast period.

AVIATION /12Z THURSDAY THROUGH MONDAY/. VFR. Gusty winds will persist through early afternoon before diminishing. Gusts 17-20 kt will be possible.

Extended Aviation Outlook: VFR. Breezy conditions Friday and Saturday.

MARINE. Today: Winds will steadily diminish across the waters today as high pressure builds in from the west and cold air advection wanes. Winds of 20-25 kt with gusts to 30 kt will be common through daybreak with winds slowly diminishing to 10-15 kt nearshore with 15-20 kt offshore by this afternoon. Small Craft Advisories will remain in force for the nearshore waters through early afternoon and the Georgia offshore waters through late afternoon. For Charleston Harbor, winds will diminish a bit quicker and the advisory continues through late morning. Seas will will peak as high as 5-7 ft offshore with 2-3 ft near the immediate coast, but will settle into the 1-2 ft nearshore, 2-3 ft offshore range by mid-late afternoon.

Tonight: There are signals that a weak surge could develop over the waters tonight as pressure and thermal gradients tighten slightly with high pressure still displaced well to the west and southwest. Northwest winds could peak as high as 15-20 kt, but speeds and gusts look to remain below Small Craft Advisory thresholds at this time. Seas will average 1-2 ft nearshore waters and 2-3 ft offshore waters.

Friday through Saturday: High pressure centered in the Gulf of Mexico will be the dominant synoptic feature into the start of the weekend, interrupted only a weak cold front Friday night and early Saturday. It is during the time frame behind the front that we have the best chances of experiencing Small Craft Advisories.

Sunday through Tuesday: the core of high pressure will move over the local vicinity late Sunday, before moving toward Bermuda thereafter. Good marine conditions on Sunday will slowly deteriorate Monday and Tuesday as the gradient starts tightening on the back side of the high. Although there is the advection of warmer and more humid air, wind fields don't appear to be favorable for sea fog at this time.

CHS WATCHES/WARNINGS/ADVISORIES. GA . None. SC . Lake Wind Advisory until 11 AM EST this morning for SCZ045. MARINE . Small Craft Advisory until 1 PM EST this afternoon for AMZ350- 352-354. Small Craft Advisory until 5 PM EST this afternoon for AMZ374. Small Craft Advisory until 11 AM EST this morning for AMZ330.




Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
41033 5 mi44 min NW 19 G 25 43°F 56°F1019.5 hPa
ACXS1 - ACE Basin Reserve, SC 16 mi67 min W 2.9 41°F 1018 hPa33°F
FPKG1 - 8670870 - Fort Pulaski, GA 31 mi58 min NW 22 G 27 42°F 55°F1019.6 hPa
FBIS1 - Folly Island, SC 39 mi52 min WNW 12 G 18 43°F 1018 hPa (+2.9)33°F
CHTS1 43 mi58 min NNW 13 G 17 45°F 55°F1017.6 hPa

Wind History for Fort Pulaski, GA
(wind in knots)    EDIT      (on/off)   Help
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Beaufort County Airport, SC10 mi57 minWNW 11 G 177.00 miFair41°F32°F70%1019 hPa
Hilton Head Island, Hilton Head Airport, SC14 mi62 minW 1010.00 miFair41°F30°F66%1019.3 hPa
Beaufort, Marine Corps Air Station, SC17 mi56 minWNW 9 G 1810.00 miFair42°F30°F65%1018.9 hPa

Link to 5 minute data for KHXD

Wind History from HXD (wind in knots)
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S10S9S6S7CalmSW6SW5SE6S33S4S6S6
2 days agoCalmCalmS5S9SW7SW8SW8N6NE5E4E5E5E5E64CalmS56
G13
SW4SW4CalmCalmS6S10
G16

Tide / Current Tables for Fripps Inlet, Hunting Island Bridge, St. Helena Sound, South Carolina
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Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.


Tide / Current Tables for Station Creek, County Landing, South Carolina
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Station Creek
Click for Map
Thu -- 03:58 AM EST     0.15 feet Low Tide
Thu -- 06:52 AM EST     Sunrise
Thu -- 09:12 AM EST     Moonrise
Thu -- 10:45 AM EST     6.43 feet High Tide
Thu -- 04:18 PM EST     0.11 feet Low Tide
Thu -- 06:17 PM EST     Sunset
Thu -- 09:58 PM EST     Moonset
Thu -- 10:57 PM EST     6.52 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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5.43.82.10.70.10.61.73.14.55.66.36.45.84.42.71.10.20.31.32.74.25.56.36.5

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 Charleston, SC (8,2,3,4)
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Ground Weather Radar Station Charleston, SC
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