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Marine Weather and Tides Rockville, SC Version 3.4

NOTICE 7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports. 6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

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Sunrise 6:48AM

Sunset 7:55PM

Sunday August 25, 2019 6:27 PM EDT (22:27 UTC)

Moonrise 12:35AM

Moonset 3:02PM

Illumination 22%

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 Rockville, SC

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Area Discussion for - Charleston, SC

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Fxus62 kchs 252013 afdchs area forecast discussion national weather service charleston sc 413 pm edt Sun aug 25 2019 Synopsis High pressure will prevail inland, while a stationary front lingers south and east of the area early this week. Meanwhile, low pressure is expected to pass well off the southeast coast. A cold front will impact the region during the middle of the week before high pressure returns late week. Near term until 6 am Monday morning The surface pattern will be somewhat complex. A wedge of high pressure will be to our north while a stationary front will generally be to our south. Finally, low pressure deciding whether it wants to form into a tropical system or not is far to our east and moving away. The high will be the most dominant of these features, which will give a majority of our area dry conditions tonight. However, models do show some light showers developing over the coastal waters, then making a run for and possibly brushing our coastal ga counties late tonight. Hence, we have slight chance pops there. Otherwise mostly cloudy skies should persist. Due to the front nearby. Lows will generally be in the upper 60s to lower 70s. Short term 6 am Monday morning through Wednesday Monday: a cooler wedge-type pattern will persist across southeast south carolina and much of southeast georgia behind a stalled front positioned south of the area. Precip chances will be quite low across southeast south carolina within a prevailing northeast sfc wind. Further south, sfc winds could be more directly onshore, helping moisture linger north of the front along near the altamaha river. The effects of the wedge will also not be as strong south, allowing temps to warm into the mid to perhaps upper 80s. Marginal instability and weak isentropic lift suggest few to scattered showers during the morning, then perhaps a few thunderstorms during mid late afternoon near the altamaha river. Any convection should wane dissipate during early overnight hours. Low temps should remain cooler, dipping into the upper 60s north and away from the coast in southeast south carolina to low mid 70s south and closer to the coast in southeast georgia. Tuesday: a quasi-stationary front should remain just south of the region, but a wedge-like pattern should weaken across the southeast united states in advance of a mid upper lvl trough of low pressure and associated sfc cold front approaching the region from the west. A southwest sfc flow ahead of the front will advect deeper moisture to the region while mid upper lvl forcing arrives late. Given the anticipated pattern, scattered to numerous showers and or thunderstorms are possible later in the day, highest chances west of i-95. Temps should warm a few degrees more than the previous day with highs generally ranging in the mid upper 80s. Some locations could experience temps in the lower 90s well inland in southeast georgia. Wednesday: a larger mid upper lvl trough of low pressure will shift across the midwest and toward the mid-atlantic states, helping push a sfc cold front into the area. The pattern should support the wettest conditions of the week as the front encounters deep moisture characterized by pwats 2.25-2.50 inches and modest instability. At this time, chances of severe weather remain fairly low, but can not be ruled out during near fropa. Regardless, scattered to numerous showers and thunderstorms are possible across much of the area. High temps should warm into the upper 80s to around 90 degrees. Long term Wednesday night through Sunday A cold front is expected to pass offshore Wednesday night or Thursday which will then linger in the vicinity through late week as high pressure builds in from the west. Models vary in regards to timing of frontal passage, with the euro the quicker solution. This makes for a lower confidence rainfall forecast as rain chances will hinge on frontal position. Overall, went with consensus pops of around 40% during the daytime hours. Temperatures will be seasonable. Aviation 20z Sunday through Friday 18z tafs: satellite imagery shows abundant clouds across the southeast, while lots of surface observations show MVFR

ceilings. With this in mind, and the fact that the clouds have not lifted much with the afternoon sun, we opted to go more pessimistic and keep MVFR ceilings for a majority of the taf time period. It's possible the TAF sites may have a window of sctVFR this afternoon, so we tried to account for this with a tempo group. Overnight, the ceilings should gradually lift, allowing for a return toVFR around daybreak Monday. But there is a lot of uncertainty with the timing. Extended aviation outlook: flight restrictions will likely persist at both chs and sav terminals Monday, due to low clouds associated with a wedge of high pressure. Brief flight restrictions are then possible with showers thunderstorms on Tuesday, then again on Wednesday with showers thunderstorms along a passing cold front. Marine Tonight: a strong wedge of high pressure will persist inland and to our north, while a stationary front is generally to our south, and finally a low is to our east. The interaction between all of these features has led to an increased surface pressure gradient, which is causing elevated winds. We are continuing the small craft advisory for amz350 due to wind gusts around 25 kt. Elsewhere, gusts should be around 20 kt. Additionally, seas have responded to these winds by building. Seas up to 6 ft are forecasted for amz374, so we also issued a small craft advisory here. Conditions are forecasted to be at their worst just after midnight, then gradually start to improve as the gradient lowers. Monday through Friday: high pressure will prevail inland while tropical low pressure tracks north northeast, well east of coastal waters offshore. The pattern will initially favor a tightened pressure gradient over coastal waters Monday with north northeast winds topping out around 15-20 kts and seas building up to 4-6 ft, highest across offshore georgia waters. For this reason, a small craft advisory will continue across offshore georgia waters early Monday before the tropical low departs north northeast of the region. Winds will weaken considerably by Tuesday, becoming onshore and remaining 10 kts or less. By Wednesday, winds should become more offshore ahead of a cold front approaching the from the west. The front should shift over coastal waters Thursday, then linger in the vicinity through late week. At this time, winds and seas are expected to remain below small craft advisory criteria mid to late week. Rip currents: increasing east northeast winds could contribute to an enhanced risk of rip currents on area beaches early week, especially if tropical low pressure intensifies while tracking well offshore. Tides coastal flooding Elevated tide levels are expected this week with the approach of the lunar perigee and new moon this Friday. Coastal flooding will be possible during the evening high tide cycles, starting as early as Monday, but more likely during the latter half of the week. In addition, there is the potential for some heavy rain around the times of high tide which could exacerbate any flooding issues. Chs watches warnings advisories Ga... None. Sc... None. Marine... Small craft advisory until noon edt Monday for amz374. Small craft advisory until 6 am edt Monday for amz350. Near term... short term... long term... aviation... marine... tides coastal flooding...

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Weather Reporting Stations

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Stations	Dist	Age	Wind	Air Temp	Water Temp	Waves	Pressure	DewPt
ACXS1 - ACE Basin Reserve, SC	9 mi	103 min	N 4.1	82°F			1016 hPa	71°F
FBIS1 - Folly Island, SC	22 mi	88 min	N 9.9 G 13	78°F			1016.4 hPa (-1.0)	70°F
41033	23 mi	80 min	NE 12 G 16	81°F	85°F		1015 hPa
CHTS1	23 mi	58 min	N 13 G 17	79°F	85°F		1015.9 hPa
41029 - Capers Nearshore (CAP 2)	38 mi	80 min	NE 16 G 21	77°F	84°F		1015.9 hPa
FPKG1 - 8670870 - Fort Pulaski, GA	51 mi	58 min	E 8.9 G 12	81°F	85°F		1015.7 hPa

Wind History for Charleston, SC

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S6 G12

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Airport Reports

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Airport	Dist	Age	Wind kt	Visibility	Sky/Weather	Temp	DewPt	Humidity	Pressure
Charleston Executive Airport, SC	17 mi	33 min	N 6 G 12	10.00 mi	Overcast	79°F	69°F	74%	1015.9 hPa
Beaufort County Airport, SC	22 mi	33 min	N 12	7.00 mi	Mostly Cloudy	81°F	69°F	70%	1015.6 hPa

Link to 5 minute data for KJZI

Wind History from JZI (wind in knots)

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E6

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N8 G13

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Tide / Current Tables for Steamboat Landing, Steamboat Creek, South Carolina

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Tide / Current Tables for Lower Toogoodoo Creek, 2 mi. above entrance, South Carolina

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Weather Map and Satellite Images

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GOES 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.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East

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Wind Forecast for Charleston, SC (18,4,5,8)

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Ground Weather Radar Station Charleston, SC

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Disclaimer: 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 numerious 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.