Saturday, November18, 2017 L-36.com


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 6:59AMSunset 5:20PM Saturday November 18, 2017 2:10 PM EST (19:10 UTC) Moonrise 6:56AMMoonset 5:51PM Illumination 0% Phase: New Moon; Moon at 29 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 181836
afdcae
area forecast discussion
national weather service columbia sc
136 pm est Sat nov 18 2017

Synopsis
High pressure ridging into the area from the western atlantic
will move out to sea this evening. A cold front will move
rapidly across the region tonight with scattered showers and
breezy conditions. A dry and cooler air mass will build over the
area Sunday and Monday. Moisture will return mid to late week
as the weak low pressure develops over the gulf of mexico.

Near term through tonight
Surface high pressure off the southeast coast will continue moving
out to sea this evening as a cold front approaches from the west.

Given southerly winds and warm advection... Will see afternoon highs
in the upper 60s to mid 70s under partly cloudy skies.

Little change in the forecast for tonight. A positively tilted upper
trough over the mississippi valley this evening will move across the
region overnight and into Sunday. Short wave trough appears to
weaken as it crosses the area with stronger dynamics to our north.

The trough will push a cold front through the area late tonight.

Front appears to move through the area between 06z and 10z with
scattered showers. Of concern is the very strong low level shear
with 60 kts at 850 mb. Instability appears very limited however with
sref most unstable CAPE around 50 j kg. Little support for
thunderstorms noted in nam GFS operational runs. Moisture appears to
be a limited factor as well with maximum precipitable water 1.5
inches. Highest pops in the piedmont and north midlands where upper
level forcing may be stronger. Gusty winds expected overnight with
strong mixing and a lake wind advisory may be needed. The showers
are expected to clear the midlands and csra by 12z Sunday.

Temperatures should remain mild ahead of the front due to
mixing... With lows from the upper 40s west to the mid 50s east.

Short term Sunday through Monday
On Sunday expect cold advection and clear skies. Breezy
conditions thru the morning, with diminishing winds during the
afternoon as the pressure gradient relaxes. Daytime highs will
be mostly in the lower 60s with downslope flow offsetting cold
advection somewhat. Temperatures near freezing in some areas
Sunday night especially northern and central counties. Patchy
frost possible may be possible elsewhere late Sunday night.

Dry and cooler air mass over the area Monday with temperatures
ranging from around 60 north to the lower 60s south.

Long term Monday night through Saturday
The upper level pattern remains somewhat amplified later in the
week, but large model differences result in a lower than normal
confidence forecast. Latest GFS and canadian models are leaning
toward some sort of low pressure development in the gulf of
mexico with a cut-off upper low over the gulf states by Thursday.

Moisture appears to focus early along old frontal boundary
across florida to the georgia and carolina coastline. Will keep
a small chance for rain mid to late week including thanksgiving
although confidence remains low with large spread in guidance.

Leaning toward cooler than normal for thanksgiving given the
pattern and possibility of rain. Overall, temperatures generally
near normal through mid-week, then below normal through
Saturday.

Aviation 18z Saturday through Thursday
High confidence forVFR conditions through the evening.

Surface high pressure over the western atlantic will continue moving
out to sea this evening as a cold front approaches from the west.

Vfr for the rest of the afternoon with cloud bases 4kft to 5kft.

Southerly wind 10 to 15 knots with gust around 20 knots this
afternoon forecast to increase tonight as the pressure gradient
tightens ahead of the cold front. Have continues llws all TAF sites
01z-12z. An approaching front will cross the TAF sites in the 06z-
11z time-frame. Brief rain showers and associated restrictions
possible ahead of the front. By 12z the front will be east of the
area with rapidly clearing skies and northwest winds 10 to 15 knots.

Extended aviation outlook... Increasing low level moisture may help
support late night early morning ifr or MVFR conditions Monday night
through Wednesday.

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 mi51 min SW 11 G 18 67°F 1011.2 hPa
WATS1 - Lake Wateree, SC 31 mi41 min SSW 1.9 G 9.9 69°F

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Columbia, Columbia Metropolitan Airport, SC9 mi75 minSW 1010.00 miMostly Cloudy72°F53°F52%1012.7 hPa
Columbia - Jim Hamilton L.B. Owens Airport, SC12 mi78 minSW 11 G 1710.00 miA Few Clouds71°F50°F47%1013.1 hPa
Winnsboro/Fairfield County Airport, SC17 mi76 minSSW 16 G 1910.00 miPartly Cloudy68°F51°F56%1012.5 hPa
McEntire Air National Guard Weather Facility Base, SC23 mi2.2 hrsSSW 510.00 miMostly Cloudy68°F49°F51%1015.2 hPa

Wind History from CAE (wind in knots)
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Last 24hrCalm3SE3E4CalmCalmCalmCalmCalmCalmW3CalmCalmCalmCalmCalmCalmCalmCalmCalmSE5SW11SW10SW16
G22
1 day agoNW3NW7CalmCalmCalmW4W3SW3CalmCalmCalmCalmCalmCalmCalmCalmCalmSW3E4E834NE6N3
2 days agoCalmCalmCalmCalmCalmW3W5SW4SW3W4S4CalmCalmCalmW3CalmCalmSW3CalmCalmNW54NW63

Tide / Current Tables for Bacon Bridge, Ashley River, South Carolina
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Bacon Bridge
Click for Map
Sat -- 04:56 AM EST     0.02 feet Low Tide
Sat -- 06:42 AM EST     New Moon
Sat -- 06:50 AM EST     Moonrise
Sat -- 06:54 AM EST     Sunrise
Sat -- 10:22 AM EST     2.43 feet High Tide
Sat -- 05:17 PM EST     Sunset
Sat -- 05:33 PM EST     0.03 feet Low Tide
Sat -- 05:48 PM EST     Moonset
Sat -- 10:27 PM EST     2.10 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.71.30.80.40.100.30.91.62.12.42.42.21.81.30.80.30.10.10.51.21.82.12.1

Tide / Current Tables for Pimlico, West Branch, Cooper River, South Carolina
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Pimlico
Click for Map
Sat -- 05:08 AM EST     0.09 feet Low Tide
Sat -- 06:42 AM EST     New Moon
Sat -- 06:49 AM EST     Moonrise
Sat -- 06:53 AM EST     Sunrise
Sat -- 10:56 AM EST     2.12 feet High Tide
Sat -- 05:16 PM EST     Sunset
Sat -- 05:45 PM EST     0.18 feet Low Tide
Sat -- 05:47 PM EST     Moonset
Sat -- 11:01 PM EST     1.83 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.61.30.90.50.20.10.20.61.21.722.121.81.40.90.50.30.20.40.91.41.71.8

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

GOES Local Image of Southeast    EDIT
Geos

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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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.