Saturday, August19, 2017

Marine Weather and Tides
Irmo, SC

Version 3.4
What's New / NOTES
6/25/2017 - NOAA is having a major issue that impact the 7 day forecast load times. Many users are reporting problems. The issue has been reported.
5/23/2017 - Worked with NOAA again to speed up the 7 day forecast load times. Thanks to them for being responsive.
5/19/2016 - There were issues with the 3 day airport observation history. I switched to another data source. Let me know if you see any issues with the data feeds.

Sunrise 6:48AMSunset 8:07PM Saturday August 19, 2017 2:39 PM EDT (18:39 UTC) Moonrise 3:24AMMoonset 5:39PM Illumination 7% Phase: Waning Crescent; Moon at 27 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 191833
area forecast discussion
national weather service columbia sc
233 pm edt Sat aug 19 2017

A weak pressure trough will linger east of the forecast area
through Monday. Upper ridging over the region will help keep
moisture shallow and limit the thunderstorm chances. It will
remain hot with heat index values peaking around 100 degrees.

Near term through tonight
The drier air over the forecast area is evident this afternoon
with generally fair weather cumulus clouds showing up on visible
imagery with the exception of some vertical development in an
area of surface convergence and deeper moisture over the
northern midlands. Precipitable water analysis shows a pocket of
very dry air with values just over 1 inch in the csra and
southern midlands while values rise rapidly to 1.4-1.5 or
higher just east of the forecast area. There is a tongue of
higher moisture as well across the northern midlands. Surface
dewpoints have mixed down into mid 60s across much of the area
which is also limiting instability. Regional radar showing most
of the convective activity occurring along the coast and into
far northeast sc and southeast nc where some upper energy is
helping to initiate convection.

Expect only isolated showers and maybe a thunderstorm across the
northeastern midlands through early evening before instability
wanes and convection diminishes with clearing skies overnight.

The slightly drier airmass along with mostly clear skies
overnight should support slightly lower min temperatures in the
lower to mid 70s. There is the possibility of some fog
development mainly across the eastern midlands and near bodies
of water due to abundant low level moisture and clear skies with
dry air aloft so added a few hours of patchy fog.

Short term Sunday through Monday night
Upper ridging will continue over the region Sunday and
Monday although models indicate some weakness in the ridging
near the coast on Monday. A stalled frontal boundary will
remain near the area through Monday which may be a focusing
mechanism for convection. Moisture will gradually return to the
area from the atlantic Sunday into Monday. Precipitable water
on Sunday afternoon will generally range from 1.4 inches west
to 1.8 inches east. On Monday, precipitable water values will
increase from 1.6 west to 2.0 east. With the frontal boundary
expected in the central midlands and higher moisture east,
continued with slight chance pops from the central midlands
eastward on Sunday. Still believe the better chance for showers
and thunderstorms will be on Monday afternoon with the deeper
moisture returning to the area, so have continued with chance
pops for most of the area. Increased sky cover slightly as
models are bringing in more moisture in the upper levels
particularly in the eastern midlands. The low-level moisture
increase may lead to patchy fog as indicated by some of the nam
and GFS mos during the early morning hours Monday. High
temperatures on Sunday are forecast in the mid to upper 90s
with heat indices around 100. Highs are forecast a few degrees
lower on Monday due to the eclipse and expected increased
clouds, although with higher dewpoint temperatures, heat
indices will still be around 100 degrees.

Long term Tuesday through Saturday
Surface low pressure will exit the great lakes region to
the northeast on Tuesday. This system will bring a cold front
toward the region on Wednesday and the front will move into the
area early Thursday. Surface high pressure centered over the
great lakes region will build into the area behind the front
for Friday and Saturday with drier air returning to the area.

Moisture will remain abundant across the area ahead of the
front supporting chance pops Tuesday through Thursday. Lower
pops toward the end of the week behind the front. Lower to
middle 90s forecast for high temperatures Tuesday through
Thursday. Temperatures behind the front for Friday and Saturday
are forecast a few degrees cooler, in the upper 80s.

Aviation 18z Saturday through Thursday
MainlyVFR conditions expected through the TAF period.

Stalled frontal boundary east of the area along with drier air
aloft over the region limiting convection this afternoon and
do not expect any terminals to be impacted. Mostly sunny skies
through the afternoon withVFR diurnal cumulus clouds which
should dissipate with sunset. Winds will be from the west less
than 10 knots through afternoon then diminish overnight and pick
back up from the east-northeast around 5 knots by 15z.

Some potential for radiation fog development late tonight in fog
prone areas but confidence is low so only included a mention at
ogb ags during 09z-12z time frame in a tempo group.

Extended aviation outlook... Scattered mainly afternoon and
evening showers and thunderstorms possible each day. Also,
low-level moisture could result in early morning fog and or

Cae watches warnings advisories
Ga... None.

Sc... None.

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
LMFS1 - Lake Murray SC 5 mi79 min SSW 11 G 12 88°F 1013.2 hPa
WATS1 - Lake Wateree, SC 31 mi69 min N 2.9 G 4.1 95°F

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Columbia, Columbia Metropolitan Airport, SC9 mi1.7 hrsSSW 1010.00 miPartly Cloudy93°F66°F41%1013.6 hPa
Columbia - Jim Hamilton L.B. Owens Airport, SC12 mi46 minWSW 9 G 1510.00 miA Few Clouds94°F64°F37%1013.7 hPa
Winnsboro/Fairfield County Airport, SC17 mi44 minWNW 310.00 miPartly Cloudy91°F64°F41%1014.6 hPa
McEntire Air National Guard Weather Facility Base, SC23 mi1.7 hrsWSW 810.00 miA Few Clouds93°F65°F40%1014.5 hPa

Wind History from CAE (wind in knots)
Last 24hrSW7SW8SW10SW8
1 day agoS3W8W6SW6W6S3CalmSW3CalmSW3CalmCalmCalmCalmW4W3CalmSW3W6NW9W9W8W8W7
2 days ago34SW6W5SW5W3CalmS3SW3CalmW3CalmCalmW3CalmW3CalmCalmSW3SW4W6W7SW3S5

Tide / Current Tables for Bacon Bridge, Ashley River, South Carolina
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Bacon Bridge
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Sat -- 04:03 AM EDT     0.02 feet Low Tide
Sat -- 04:22 AM EDT     Moonrise
Sat -- 06:46 AM EDT     Sunrise
Sat -- 09:03 AM EDT     2.14 feet High Tide
Sat -- 04:10 PM EDT     -0.09 feet Low Tide
Sat -- 06:32 PM EDT     Moonset
Sat -- 08:01 PM EDT     Sunset
Sat -- 09:37 PM EDT     2.59 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

Tide / Current Tables for Pimlico, West Branch, Cooper River, South Carolina
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Sat -- 04:15 AM EDT     0.11 feet Low Tide
Sat -- 04:21 AM EDT     Moonrise
Sat -- 06:45 AM EDT     Sunrise
Sat -- 09:37 AM EDT     1.87 feet High Tide
Sat -- 04:22 PM EDT     -0.48 feet Low Tide
Sat -- 06:31 PM EDT     Moonset
Sat -- 08:00 PM EDT     Sunset
Sat -- 10:11 PM EDT     2.26 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

Weather Map and Satellite Images
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Weather Map
IR Satellite Image from GEOS

GOES Local Image of Southeast    EDIT

Wind Forecast for Columbia, SC (14,3,4,5)
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Ground Weather Radar Station Columbia, SC
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weather_mapweather_map weather_map

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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 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 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.