Saturday, February23, 2019 L-36.com


Marine Weather and Tides
Irmo, SC

Version 3.4
What's New / NOTES
10/6/2018 Colors of tide XTide graphs changed to emphasize that they were upgraded. See next note. Comments welcome.
10/4/2018 I have fixed XTide and updated the harmonic files. There were some name changes so you might have to click EDIT to find the new station name.

Sunrise 6:59AMSunset 6:16PM Saturday February 23, 2019 10:57 AM EST (15:57 UTC) Moonrise 11:00PMMoonset 9:50AM Illumination 82% Phase: Waning Gibbous; Moon at 19 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 231134
afdcae
area forecast discussion
national weather service columbia sc
634 am est Sat feb 23 2019

Synopsis
A frontal system will remain in the region through Saturday
night. A cold front will cross the area Sunday with a dry air
mass overspreading the region during the afternoon. Dry high
pressure will be in control Monday and Tuesday.

Near term through tonight
The wedge-ridge pattern will continue today. The models and
water vapor imagery trends support the deep plume of moisture
staying mainly just west and north of the forecast area. Support
for showers will be greatest in the northwest part of the
forecast area closer to the deeper moisture and greater upper
lift associated with a series of mid-level shortwave troughs on
the northern periphery of the upper ridging off the southeast
coast. The high-resolution models display mainly scattered
shower coverage mainly in west and north sections. The
isentropic lift will continue to support periods of drizzle
throughout the area. The models indicate light rainfall amounts
of less than one-quarter of an inch. The wedge pattern supports
following the lower temperature guidance.

The wedge warm front should lift northward ahead of the
approaching cold front tonight. The NAM surface-based LI pattern
suggests the warm front reaching the csra and south midlands
toward sunrise. The GFS is faster with the warm frontal timing.

The pattern supports the slower timing. Shear will be high and
the south part may get into the warm sector indicating a
possibility of severe thunderstorms but believe the threat will
remain low because of a lack of surface-based instability. Both
the NAM and more progressive GFS maintain surface-based li
values above zero through the night. Elevated instability also
appears limited. The GFS and ecwmf keep showalter index values
above zero overnight. The shower chance should be on the
increase during the night and there may also be a mid-level
shortwave trough. We forecasted pops becoming likely in the west
part toward morning just ahead of the front. Expect steady or
rising temperatures overnight as the warm front lifts farther
northward.

Short term Sunday through Monday night
Cold front will be nearing the area at sunrise Sunday morning
then crossing the area through midday. By early Sunday afternoon
the front will push to the coast and offshore by late afternoon.

Pwat values will be around 1.6 inches early Sunday morning ahead
of the front then drop rapidly with FROPA as winds turn westerly
and dry air intrudes in the mid levels. With weak dynamics and
limited instability with FROPA have remained with showers and no
mention of thunder. High pressure will build into the region
Sunday afternoon with skies clearing through the afternoon and
gusty southwesterly winds veering to westerly by early evening.

With the gusty winds a lake wind advisory may be needed Sunday
and will continue to monitor. Temperatures Sunday will be in the
low to mid 70s with good radiational cooling resulting in
overnight lows in the upper 30s to low 40s.

High pressure will be over the region Sunday night through
Monday night keeping dry air and mostly clear skies in place.

Winds will subside Sunday night as the pressure gradient relaxes
and be less than 5 mph through the day Monday. High temperatures
Monday will be in the low to mid 60s and with excellent
radiational cooling Monday night lows will be in the mid to
upper 30s.

Long term Tuesday through Friday
High pressure will be over the region Tuesday morning then
quickly move eastward with southerly flow returning to the
region. Tuesday night and Wednesday the remains of the frontal
boundary will move northward and back into the region... Although
models differ on handling of the boundary and amount of moisture
advecting northward. Model differences continue through the end
of the week... However models agree on a large upper level ridge
over the eastern pacific ocean with a relatively zonal flow over
the much of the us. This will result in a progressive pattern
with a series of disturbances crossing the region Thursday and
Friday. Temperatures through the long term will be near normal.

Aviation 12z Saturday through Wednesday
Expect ifr conditions through the 24-hour TAF period. Low-level
wind shear may be an issue beginning around 22z.

Low-level moisture will remain high in a wedge-ridge pattern
and expect continued ifr conditions. The models and water vapor
imagery trends support the deep plume of moisture staying mainly
just west and north of the forecast area. Support for showers
will be greatest just northwest of the terminals and closer to
the deeper moisture and greater upper lift associated with a
series of mid-level shortwave troughs on the northern periphery
of the upper ridging off the southeast coast. The high-
resolution models display mainly scattered shower coverage
mainly just west and north of the terminals. There should be
continued periods of drizzle because of the warm advection
pattern above the wedge ridge.

The models depict the wedge warm front lifting farther northward
tonight. It may reach the southern terminals late but confidence
is low. Expect continued ifr conditions. Fog may become more
dense closer to the warm front. Shower coverage may increase
with a strengthening low-level jet ahead of the approaching cold
front but the bulk of these showers will probably hold off until
after 06z. The NAM and GFS maintain surface-based stability
through the night and we expect limited mixing and wind. These
conditions combined with the low-level jet increasing ahead of
the cold front support low-level wind shear becoming an issue.

We included the shear in the terminal forecasts based on the
nam.

Extended aviation outlook... High confidence for continued
flight restrictions early Sunday associated with the cold
front. It will become breezy and dry behind the front later
Sunday. High pressure is forecast in the region Monday and
Tuesday with dry conditions and diminished winds. Widespread
restrictions could occur Wednesday associated with an onshore
flow or possible low pressure development in the region.

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 mi38 min ENE 5.1 G 8.9 45°F 1024 hPa
WATS1 - Lake Wateree, SC 31 mi88 min ESE 1.9 G 5.1 44°F

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Columbia, Columbia Metropolitan Airport, SC9 mi2 hrsNE 52.00 miFog/Mist46°F46°F100%1025.4 hPa
Columbia - Jim Hamilton L.B. Owens Airport, SC12 mi2.1 hrsENE 76.00 miFog/Mist46°F43°F89%1025.9 hPa
Winnsboro/Fairfield County Airport, SC17 mi63 minNE 82.00 miFog/Mist43°F42°F100%1025.1 hPa
McEntire Air National Guard Weather Facility Base, SC23 mi2 hrsNE 65.00 miFog/Mist44°F44°F100%0 hPa

Wind History from CAE (wind in knots)
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Last 24hrNE6E8NE6NE6NE8NE5NE84NE11E8NE6NE8E9NE9E7NE6NE7NE5E9E5NE5NE6NE5E7
1 day agoCalmSW5SW6W7SW9W8NW6N4CalmCalmCalmCalmSE4E3SE3SE5SE3N4N5NE7N7NE8NE10NE7
2 days agoNE6NE8NE7NE6N5N5N4NE4NE543E5E5CalmN3NW3E3CalmCalmCalmCalmCalm3
G14
Calm

Tide / Current Tables for Bacon Bridge, Ashley River, South Carolina
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Bacon Bridge
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Sat -- 01:17 AM EST     2.19 feet High Tide
Sat -- 06:56 AM EST     Sunrise
Sat -- 08:23 AM EST     -0.25 feet Low Tide
Sat -- 09:46 AM EST     Moonset
Sat -- 01:36 PM EST     2.09 feet High Tide
Sat -- 06:12 PM EST     Sunset
Sat -- 08:45 PM EST     -0.20 feet Low Tide
Sat -- 10:55 PM EST     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.92.22.11.91.40.90.4-0-0.2-0.20.411.622.11.91.51.10.60.1-0.1-0.20.20.8

Tide / Current Tables for Pimlico, West Branch, Cooper River, South Carolina
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Pimlico
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Sat -- 02:00 AM EST     2.01 feet High Tide
Sat -- 06:55 AM EST     Sunrise
Sat -- 08:39 AM EST     -0.65 feet Low Tide
Sat -- 09:45 AM EST     Moonset
Sat -- 02:19 PM EST     1.92 feet High Tide
Sat -- 06:11 PM EST     Sunset
Sat -- 09:01 PM EST     -0.52 feet Low Tide
Sat -- 10:54 PM EST     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.31.821.91.50.90.3-0.2-0.6-0.6-0.20.41.11.61.91.91.61.10.50-0.4-0.5-0.30.2

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.
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Wind Forecast for Columbia, SC (10,2,3,4)
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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 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.