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Marine Weather and Tides Rockville, 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 7:16AM

Sunset 5:47PM

Sunday January 26, 2020 6:35 AM EST (11:35 UTC)

Moonrise 8:39AM

Moonset 7:33PM

Illumination 2%

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 261058 AFDCHS

Area Forecast Discussion National Weather Service Charleston SC 558 AM EST Sun Jan 26 2020

SYNOPSIS. A disturbance will move through the area late tonight into early Monday, followed by a return of high pressure. Another weak disturbance should pass to the south midweek followed by a potentially more potent storm system for the region towards the end of the week.

NEAR TERM /UNTIL 6 PM THIS EVENING/. Nudged highs up a degree in a few areas per latest mesoscale data. Cirrus is clearing as expected. The forecast is on track for the sunrise update.

A fairly zonal flow will prevail across the Deep South into the Southeast U.S. today as surface high pressure maintains its influence on the region. A thick batch of cirrus associated with the subtropical jet is progged to exit off the coast by daybreak leaving much of the day with sunny to mostly sunny skies. This clearing is denoted well on GOES-E IR imagery across portions of Alabama, Mississippi and the Florida Panhandle early this morning. Highs are poised to rise into the lower 60s for many areas as near full insolation combines with 850-1000 hPa thicknesses of 1338-1444 meters. Cirrus will begin to increase again from the west late this afternoon ahead of shortwave energy propagating into the lower Mississippi Valley, but data suggest most of this will likely hold off until near or after the diurnal maximum. Rain-free conditions will persist.

SHORT TERM /6 PM THIS EVENING THROUGH WEDNESDAY/. Tonight: Shortwave energy digging southeast across the Plain States this afternoon is forecast to phase with a southern stream shortwave exiting out of East Texas later this evening. The Texas shortwave is already helping to generate scattered to numerous showers with some tstms across coastal Texas into portions of Louisiana, Arkansas, and the northwest Gulf of Mexico this morning. This activity will steadily push east through the day, slowly consolidating across the north-central Gulf coast before expanding northeast into portions of central/southern Georgia into southern South Carolina later tonight. The resident airmass across the region is quite dry with large dewpoint depressions noted through much of the lower Troposphere. Although the atmosphere will slowly moisten this evening as light rain begins to fall into it, any meaningful rainfall should hold off until the midnight-daybreak timeframe when the corridor of strongest quasi-geostrophic forcing with the phased shortwaves swing through. Rainfall amounts look to remain quite light with most areas likely only picking up a few hundredths, possibly as high as 0.10-0.15" where pockets of heavier rain falls.

This event has the usual characteristics of a winter-time high pop/low QPF scenario. Likely pops look reasonable for most areas for the overnight period. The dry air may prove too much to get measurable rainfall across the far northern areas near the Santee-Cooper Lakes, so this will have to be monitored closely. Lows will range from the mid 40s inland to the upper 40s/near 50 at the coast.

Monday: The mid-levels will consist of a wave moving offshore in the morning, followed by semi-zonal flow overhead. In the evening, another wave will approach from the northwest, mainly passing to our north overnight. At the surface, a weak storm system located in the Gulf of Mexico will move east. Meanwhile, high pressure will move into our area from the northwest. Any remaining showers will quickly end from west to east in the morning as drier air moves in. A few hundredths of QPF is possible in the morning, followed by a dry afternoon with gradually clearing skies. Overnight will be dry as well with a continual decrease in clouds. High and low temperatures should be normal.

Tuesday: A mid-level wave just offshore in the morning will move away, allowing semi-zonal flow to prevail overhead. High pressure centered to our northwest will continue to bring our area dry conditions with mostly sunny skies during the day. Overnight a distant storm system will approach from the west. It's not expected to reach our area. Though, high clouds should increase overnight. Temperatures will be normal.

Wednesday: The mid-levels will consist of wave to our west in the morning. The wave should pass overhead in the afternoon or evening. At the surface, a weak storm system centered near the Lower MS Valley in the morning will move eastward. The bulk of the energy is expected to pass to our south during the afternoon and evening. Likewise, the best lift and moisture will also remain to our south. Models only hint at some isolated to maybe scattered showers across our area. We have the highest POPs near the Altamaha, especially in the afternoon. QPF should be minimal, if anything. Highs are expected to be normal.

LONG TERM /WEDNESDAY NIGHT THROUGH SATURDAY/. A quick moving storm system will be to our south Wednesday night, moving to the east. Some light showers are possible Wednesday night, with clearing by daybreak Thursday. High pressure far to our north should bring dry conditions on Thursday. But this will be short- lived. Thursday night a storm system starts to develop in the Gulf of Mexico, overspreading the Southeast perhaps on Friday, then moving offshore maybe on Saturday. The 00Z models still have significant differences in the location, strength, and evolution of this system, which makes the potential impacts to our area still difficult to determine. We opted to continue with chance POPs. More changes will be needed as future model runs come into better agreement.

AVIATION /12Z SUNDAY THROUGH THURSDAY/. VFR. Risk for showers will increase at both terminals overnight, especially at KSAV. Limited conditions to low-end VFR for now given the light nature of the rainfall that is expected.

Extended Aviation Outlook: VFR.

MARINE. Through Tonight: There are no concerns. West winds will prevail through the period with winds generally less than 15 kt. Seas will average 2-4 ft, although will initially be as high a 5 ft over the eastern portions of the Georgia offshore leg this morning.

Monday through Thursday: High pressure will prevail Monday into Tuesday. A weak disturbance should pass to our south Wednesday. A potentially more potent storm system could approach the coastal waters towards the end of the week. No marine headlines are expected for the current forecast time period.

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

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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	110 min	WSW 1.9	41°F			1018 hPa	37°F
FBIS1 - Folly Island, SC	22 mi	35 min	W 6 G 8.9	43°F			1018.1 hPa (-0.0)	36°F
41033	23 mi	87 min	NW 12 G 18	45°F	53°F		1018.4 hPa
CHTS1	23 mi	53 min		45°F	53°F		1017.3 hPa
41029 - Capers Nearshore (CAP 2)	38 mi	87 min	NW 12 G 16	46°F	53°F		1017.8 hPa
FPKG1 - 8670870 - Fort Pulaski, GA	51 mi	53 min		45°F	51°F		1018.4 hPa

Wind History for Charleston, SC

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NW6 G11

NW4

W3 G6

NW4 G10

NW8 G12

NW9 G15

NW5 G17

W8 G12

NW7 G12

NW7 G11

W7 G13

W5 G10

W5 G10

W4 G9

W6 G10

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NW7 G11

W4 G7

W6 G10

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1 day ago

N4

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2 days ago

N8 G11

N12

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N7 G10

N9

N8 G11

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N5 G9

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NE11 G15

NE10 G14

NE12 G19

NE13 G16

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NE12 G17

N6 G12

N6 G9

NE9 G13

N8 G11

N6

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W2

N5

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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	40 min	N 0	10.00 mi	Fair	43°F	35°F	76%	1017.9 hPa
Beaufort County Airport, SC	22 mi	40 min	W 5	10.00 mi	Fair	41°F	35°F	81%	1017.9 hPa
Beaufort, Marine Corps Air Station, SC	24 mi	39 min	W 3	10.00 mi	Fair	42°F	35°F	76%	1017.9 hPa

Link to 5 minute data for KJZI

Wind History from JZI (wind in knots)

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W8 G17

W5 G13

W6 G13

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1 day ago

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SW3 G11

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NE6 G12

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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

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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.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East

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Wind Forecast for Charleston, SC (6,6,7,8)

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Ground Weather Radar Station Charleston, SC

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