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Marine Weather and Tides Hilton Head Island, 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.

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Sunrise 6:41AM

Sunset 8:16PM

Friday August 7, 2020 8:40 PM EDT (00:40 UTC)

Moonrise 9:54PM

Moonset 9:15AM

Illumination 83%

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.

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7 Day Forecast for Marine Location Near Hilton Head Island, SC

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Area Discussion for - Charleston, SC

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FXUS62 KCHS 080034 AFDCHS

Area Forecast Discussion National Weather Service Charleston SC 834 PM EDT Fri Aug 7 2020

SYNOPSIS. A stationary front will linger to the west through the weekend before dissipating. The region will then be positioned between Atlantic high pressure centered offshore and an inland area of broad low pressure.

NEAR TERM /THROUGH SATURDAY/. We issued a quick update to account for a rapid decay in convection over our southern and southwest zones, and also to add mention of isolated activity near the Charleston area to account for development along an outflow boundary.

Previous discussion . Convection will take longer than is typical to fade tonight, given short wave energy aloft and various meso-scale boundaries that will have sufficient instability and lift to go along with plentiful moisture (given PWat in excess of 2 inches). We anticipate storms early tonight could be locally strong given DCAPE greater than 800 J/kg over our northwest tier, plus locally heavy rains can also occur given slow storm motion and good moisture transport.

We have PoP as high as 50-60% through mid evening, trending down to 30-40% by midnight, with still as much as 20-30% thereafter. After about 9 pm the best chances for showers and t-storms will be over north and northwest counties, in closer proximity to the stationary front and where upstream activity will move in with the short wave aloft.

Min temperatures will be in the low to mid 70s further inland and upper 70s along the coast.

SHORT TERM /SATURDAY NIGHT THROUGH MONDAY/. Saturday: It is possible that a few remnant showers from this evening's convection over the Midlands will linger until the daylight hours Saturday. However, HREF indicates that convection, if any remains, will be very light. The forecast will generally focus on the formation of the sea breeze during the late morning hours, drifting inland during the afternoon and evening. Given the combination of deep moisture, moderate instability, and a sea breeze, PoPs are forecast to peak between 40-50 percent during the afternoon. High temperatures are forecast to range from the low 90s across the SC Lowcountry to the mid 90s across SE GA. Heat index values across the SE GA coastal counties may peak around 105 degrees Saturday afternoon. Saturday night, near term models indicate that the axis of a H5 trough will approach from the west. Weak forcing associated with the trough is expected to arrive Saturday night, a few showers and thunderstorms may develop and persist over the waters. Low temperatures are forecast to range in the mid to upper 70s.

Sunday and Monday: The axis of a H5 trough will slowly ripple over the region. Forecast soundings indicate slightly cooler mid-level temps and steeper lapse rates. Given lingering moisture, scattered to numerous thunderstorms are expected each afternoon and evening across the forecast area, especially across SE GA. High temperatures and heat index values should not vary by more than a couple of degrees from the values on Saturday.

LONG TERM /MONDAY NIGHT THROUGH FRIDAY/. The mid-level weakness is forecast to amplify by mid-week, possibly briefly cutting off over central South Carolina and Georgia as weak shortwave ridging develops to its north and a pronounced shortwave passes north over the Ohio Valley and Mid-Atlantic. This should help increase the amount of showers/tstms each afternoon within a ribbon of tropical moisture (PWATS at or above 2.25") with rain chances lingering through the night. Pops 50-60% Tuesday will increase to 60- 70% both Wednesday and Thursday when the weakness/upper low makes its closest approach. Highs are expected to top out in the lower-mid 90s Tuesday, then lower into the upper 80s/lower 90s by mid-week as afternoon heating will be limited by numerous showers/tstms. Isolated strong tstms will be possible and there will be a risk for localized flooding, especially in low-lying and poor drainage areas. Lows will range from the lower-mid 70s inland with upper 70s/lower 80s at the coast and Downtown Charleston, although daily lows could be augmented at times by convective influences.

AVIATION /01Z SATURDAY THROUGH WEDNESDAY/. The 00Z TAF set for KCHS and KSAV shows prevailing VFR through the entire period, but there are a three concerns for potential flight restrictions. It's just that the chances of any of these occurrences are too low to include at this time.

First will be the chance of upstream SHRA/TSRA perhaps reaching the KCHS terminal between 04Z and 08Z associated with a short wave.

Second, there could be temporary MVFR ceilings at KCHS even if convection doesn't occur, given the HREF probabilities of 40-60% from about 04Z to 10Z.

Finally, there will be the potential for afternoon/evening convection associated with the sea breeze and various other meso-scale boundaries. This could result in sub-VFR weather after 18Z Saturday. However, this far in advance it is not worth showing anything more than VCTS and CB clouds at both sites.

Extended Aviation Outlook: Tstm impacts possible each afternoon/evening. There will be a risk for marine-based stratocumulus establishing MVFR cigs each night, mainly at KCHS.

MARINE. Tonight: Between Atlantic high pressure and an inland stationary front, winds will remain southerly as high as 12-17 kt through the night, with seas generally 2-3 feet. A few of the t-storms could still produce gusty winds and heavy rainfall.

Saturday through Tuesday: The sfc pattern will feature high pressure centered over the western Atlantic and broad low pressure inland. This pattern should generally support south winds between 10 to 15 kt and seas between 1-2 ft. The formation of land breeze circulations will be possible during early morning hours resulting in a light westerly wind around sunrise. This feature could be a focus for waterspouts during mid-late morning hours for the next several days.

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

NEAR TERM . SHORT TERM . NED LONG TERM . AVIATION . MARINE .

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Weather Reporting Stations

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Stations	Dist	Age	Wind	Air Temp	Water Temp	Waves	Pressure	DewPt
FPKG1 - 8670870 - Fort Pulaski, GA	15 mi	52 min	SW 5.1 G 7	79°F	86°F		1018.2 hPa
41033	20 mi	92 min	WSW 16 G 23	84°F	86°F		1018 hPa
ACXS1 - ACE Basin Reserve, SC	29 mi	115 min	SSE 1	85°F			1019 hPa	79°F
FBIS1 - Folly Island, SC	57 mi	40 min	S 16 G 19	84°F			1018.6 hPa

Wind History for Fort Pulaski, GA

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NE1

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Airport Reports

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Airport	Dist	Age	Wind kt	Visibility	Sky/Weather	Temp	DewPt	Humidity	Pressure
Hilton Head Island, Hilton Head Airport, SC	4 mi	50 min	WSW 8	10.00 mi	Overcast	82°F	71°F	70%	1017.9 hPa
Beaufort County Airport, SC	15 mi	45 min	SW 6	5.00 mi	Partly Cloudy with Haze	81°F	73°F	79%	1017.6 hPa
Beaufort, Marine Corps Air Station, SC	18 mi	44 min	SSW 6	10.00 mi	Fair	83°F	73°F	74%	1017.5 hPa
Savannah-Hilton Head International Airport, GA	23 mi	47 min	SSW 5	10.00 mi	Mostly Cloudy	78°F	73°F	85%	1017.4 hPa
Hunter U. S. Army Airfield, GA	24 mi	44 min	SW 4	10.00 mi	Fair	76°F	72°F	87%	1016.9 hPa

Link to 5 minute data for KHXD

Wind History from HXD (wind in knots)

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S5

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Tide / Current Tables for Skull Creek, south entrance, Hilton Head Island, South Carolina

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Tide / Current Tables for Savannah River Entrance, Georgia Current

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Weather Map

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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

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Wind Forecast for Charleston, SC (20,4,5,8)

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Ground Weather Radar Station Charleston, SC

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