Tuesday, August4, 2020
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Marine Weather and Tides
Irmo, 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 6:37AMSunset 8:23PM Tuesday August 4, 2020 1:54 AM EDT (05:54 UTC) Moonrise 8:26PMMoonset 6:22AM Illumination 100% Phase: Full Moon; Moon at 15 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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7 Day Forecast for Marine Location Near Irmo, SC
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location: 34.08, -81.18     debug


Area Discussion for - Columbia, SC
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FXUS62 KCAE 040545 AFDCAE

Area Forecast Discussion National Weather Service Columbia SC 145 AM EDT Tue Aug 4 2020

SYNOPSIS. Hurricane Isaias will be moving northward off the GA coast overnight. This will bring today bringing widespread showers and isolated thunderstorms to the region. The system will lift northeastward away from the area by early Tuesday. There will be at least a high chance for showers and thunderstorms through the week and into the weekend an upper level trough traverses the region.

NEAR TERM /UNTIL 6 AM THIS MORNING/. Flash Flood Watch and Tropical Storm Warnings have been cancelled.

Isaias has been upgraded to a hurricane by the National Hurricane Center as of 8pm but the center of the storm remains well east of our forecast area and it is tracking northward faster than previously expected.

The heaviest rain associated with Isaias has been east of the forecast area and the western edge of the rain shield continues to constrict from west to east over the Coastal Plain. While there continues to be scattered showers rotating through the Pee Dee into the Midlands, the threat of significant flooding has diminished and therefore the Flash Flood Watch has been cancelled. The Tropical Storm Warning for Clarendon and Orangeburg counties has also been cancelled as winds have been well below tropical storm force and not expected to reach that level this evening.

Regional radar continues to show widespread rain with a few embedded thunderstorms moving through the western Midlands and CSRA associated with an approaching upper trough. Updated pops to account for current trends.

SHORT TERM /6 AM THIS MORNING THROUGH WEDNESDAY NIGHT/. Isaias will track away from the area Tuesday with some subsidence during the morning and early afternoon. A broad upper trough remain west of the area through Wednesday night. A Highest chances of rainfall on Tuesday will be over the northern Midlands and Pee Dee where the best moisture and instability will linger from Isaias. Mainly diurnal convection expected for Wednesday with weak surface trough interacting with moderate instability and short wave energy in southwest flow aloft. PWAT values remain between 1.5 and 2.0 inches. High temperatures will return to near normal ranging from the upper 80s north to the low 90s south and overnight lows in the low 70s.

LONG TERM /THURSDAY THROUGH MONDAY/. The long term model data has been relatively consistent in the long term. Therefore little has changed in the forecast. A broad upper level trough will remain over the eastern CONUS for much of the long term forecast. This will generally promote southerly low level moisture advection into the region and place the forecast area under an area of weak upper level divergence. The ECMWF ensemble mean suggests PWAT values will be around 1.5 inches mid-week increasing to near 2 inches for the weekend, the GEFS shows less of an increase. This pattern favors at least a high chance of showers and thunderstorms through Sunday, before the upper trough axis finally shifts east.

It still appears the highest rainfall chances will be on Thursday and Friday when the upper level trough crosses the region. Convection may also occur outside of the typical Summertime afternoon and evening timeframe. Several shortwave troughs are expected to move through the base of the broad trough and enhance convective activity in the long term. Near normal temperatures are forecast with highs in the upper 80s to mid 90s and lows mainly in the low 70s to mid 70s.

AVIATION /04Z TUESDAY THROUGH SATURDAY/. Periods of MVFR/IFR restrictions prior to sunrise, with conditions improving by late morning.

Winds will die down in the coming hours to light and variable. Some low level stratus is expected to move in as the morning goes on, with periods of low ceilings. Periods of light fog possible at all TAF sites, with denser, more stubborn fog at AGS and DNL given the amount of moisture from yesterday's rain and lower wind speeds. Conditions to improve shortly after sunrise as winds start to pick up.

This afternoon, winds will be SW at 5-8kts. With drier air behind the tropical system and no forcing mechanism, very little convection is expected.

EXTENDED AVIATION OUTLOOK . An upper level trough will keep a high chance of showers and thunderstorms in the forecast through the weekend. Early morning fog and reduced visibilities in thunderstorms are possible through the extended.

CAE WATCHES/WARNINGS/ADVISORIES. GA . None. SC . None.

SYNOPSIS . 99 NEAR TERM . 99 SHORT TERM . 99 LONG TERM . 99 AVIATION . 99


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
LMFS1 - Lake Murray SC 5 mi34 min WNW 4.1 G 8.9 71°F
WATS1 - Lake Wateree, SC 31 mi84 min NW 9.9 G 14 73°F

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Columbia, Columbia Metropolitan Airport, SC9 mi58 minW 610.00 miPartly Cloudy72°F69°F91%1011.5 hPa
Columbia - Jim Hamilton L.B. Owens Airport, SC12 mi61 minWNW 710.00 miFair73°F70°F90%1011.6 hPa
Winnsboro/Fairfield County Airport, SC17 mi59 minNW 710.00 miOvercast68°F66°F94%1012.5 hPa
McEntire Air National Guard Weather Facility Base, SC23 mi58 minW 710.00 miMostly Cloudy71°F71°F100%1011.9 hPa

Link to 5 minute data for KCAE

Wind History from CAE (wind in knots)
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Last 24hrCalmE3E3CalmNE3CalmNE3E6E63E7E8E6E11E19
G24
CalmN5N7NW7NW11
G20
NE5E7NW5W6
1 day agoS3S4SW4S3CalmCalmCalmSW6SW5SW7SW7SE7S6S9S6S5NW7CalmCalmCalmSE5SE4S5SE5
2 days agoSW4SW3W4SW4CalmS4W4SW75SW7SW5SW9S10S7S7SE10SE10SE7SE5SE4SE5S6S7SW3

Tide / Current Tables for Bacon Bridge, Ashley River, South Carolina
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Bacon Bridge
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Tue -- 06:36 AM EDT     Sunrise
Tue -- 06:51 AM EDT     0.05 feet Low Tide
Tue -- 07:20 AM EDT     Moonset
Tue -- 11:53 AM EDT     1.91 feet High Tide
Tue -- 06:54 PM EDT     0.01 feet Low Tide
Tue -- 08:16 PM EDT     Sunset
Tue -- 09:20 PM EDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.32.21.81.40.90.50.10.10.30.91.41.81.91.81.51.20.80.40.100.30.81.42

Tide / Current Tables for Pimlico, West Branch, Cooper River, South Carolina
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Pimlico
Click for Map
Tue -- 12:25 AM EDT     2.15 feet High Tide
Tue -- 06:35 AM EDT     Sunrise
Tue -- 07:07 AM EDT     0.14 feet Low Tide
Tue -- 07:19 AM EDT     Moonset
Tue -- 12:36 PM EDT     1.75 feet High Tide
Tue -- 07:10 PM EDT     0.03 feet Low Tide
Tue -- 08:15 PM EDT     Sunset
Tue -- 09:19 PM EDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.12.11.91.51.10.70.30.10.30.61.11.51.71.71.61.30.90.50.200.10.61.11.6

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.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Columbia, SC (1,6,7,8)
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Ground Weather Radar Station Columbia, 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 numerous 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.