MesoWest Information for SC020 in Elevated Roadway I-26, SC, United States Of America (site inactive)

The following information is known about SC020. If you think that any information is incorrect, then please follow the instructions for correcting that data item.

It is possible that this page will report a problem where no problem exists. If you believe that this has happened, then please contact me (address at the bottom of this page) and explain clearly why you think this page is in error. Note that any changes that you make may take a few days to show up here, so please give it a week before commenting.

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SC020
GW5002
DW6826
GW3912
FW7773
GW1163
GW0366
GW0912
FW8019
FW8165
KG4QXF
FW9898
WW1TA
FW7194
FW7170
GW4091
FW3019
GW4199
DW8485
DW3024
DW2447
GW0531
GW1509
FW7658
GW3674
GW4090
FW3330
KQ4RTB
GW3951
DW7655
GW0404
GW0044
GW4769
FW2360
GW4000
EW5085
GW3883
EW7740
EW2371
EW7698
DW6758
FW9658
EW1557
EW6014
FW5945
DW0323
EW2781
W2DEN
CW7235
W6KRP
FW8687
EW9963
EW8090
FW8772
KI4UEM
CW0637
W4RWF
GW5937
FW7647
GW0818
W4GS-12
EW6942
EW9363
FW6635
FW7972
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Registered Location

Latitude: 32° 48' 42" N (deg min sec), 32.8116° (decimal), 3248.70N (LORAN)
Longitude: 79° 57' 5" W (deg min sec), -79.9513° (decimal), 07957.08W (LORAN)
Elevation: 6 metres (21 feet) -- validated against 10 metres (33 feet) from Geonames
Location: Elevated Roadway I-26, SC, United States Of America
County: Charleston, SC
Data provider: SCDOT
Forecast Office: Charleston (CHS)

The site location should be at the mark shown -- or very close. Clicking within the map area (or you can drag the 'SC020' marker) will display the latitude/longitude of that point.

If the displayed location (or elevation) of the weather observing location is incorrect, please drag the marker to the right location (or click in the right location), and then send the updated information. Please note that we are trying to spot either the Stevenson Screen (or equivalent) or the location where the barometric readings are taken.

Can you help with location quality? Please indicate if the marker on the map points at the weather instrument cluster:

The location information for this site was gathered from 1 data source. The source which most closely matches the consensus is chosen. Many of these sources only report the location to the nearest minute (or hundredth of degree). This can lead to the marker being placed noticeably incorrectly. Please see Discussion of Location Errors for more information. Show location history.

There are no photographs of the station. If you have pictures of this location, then please email them to sc020@photo.gladstonefamily.net.

You can try to find photographs from the area surrounding the site marker by clicking on Find nearby photographs. (There are none)

Data Status

Over the last 28 days, no data was seen on the following dates: 2025-02-17 to 2025-02-20, 2025-03-03 to 2025-03-14.

Recent observations from this weather station can be downloaded as a CSV file suitable for importing into various spreadsheet programs: last 7 days, last 14 days, last 28 days, last 56 days. This data can also be linked directly from Excel using a Web Query. The main link goes to the page with the data on it, and the IQY link is the Web Query that will access it: last 7 days (IQY: last 7 days), last 14 days (IQY: last 14 days), last 28 days (IQY: last 28 days), last 56 days (IQY: last 56 days).

All the means and standard deviations shown below are from the last 28 days. Change analysis period to Last 3 days  Last 7 days  Last 14 days  Last 8 weeks  Last 13 weeks  Last 26 weeks  Last 39 weeks  Last 52 weeks  

Barometer

Average barometer error: 5.9 milliBars
Error standard deviation: 1.2 milliBars
Worst daily average barometer error: 7.8 milliBars
Mean error value of 5.9 exceeds limit of 2.0
 
MADIS
rating
MADIS rating 0% QC OK
Sensor fails following checks:
L2 Statistical Spatial Consistency
L3 Spatial Consistency
 

Latest daily graph:

Latest daily graph

There is a significant mean error in your barometer readings. You may need to calibrate your barometer. Since your readings are low, it is possible that your software is not adjusting the reading for elevation, or that your station altitude has been entered incorrectly into your software.

Temperature

  24 hours  Day time  Night time
Average temperature error-1.1 °F-1.6 °F-0.8 °F
Error standard deviation1.4 °F1.7 °F1.0 °F

NOTE: If the error above is POSITIVE, then it means that the analysis temperature is HIGHER than the reported temperature. This means that your sensor is reading COLDER than expected.

 
 
MADIS
rating
MADIS rating 99% QC OK
 

Latest daily graph:

Latest daily graph

These values are within the acceptable range. This probably means that your sensor is sited correctly and is calibrated correctly.

Dewpoint -- or switch to Relative Humidity

  24 hours  Day time  Night time
Average dewpoint error2.9 °F4.9 °F1.3 °F
Error standard deviation3.4 °F2.6 °F3.0 °F
Worst average dewpoint error5.3 °F7.8 °F4.3 °F
Worst standard deviation5.5 °F3.5 °F4.0 °F

NOTE: If the error above is POSITIVE, then it means that the analysis temperature is HIGHER than the reported temperature. This means that your sensor is reading COLDER than expected.

  Mean error (2.9) out of range, but low standard deviation (3.4)
 
MADIS
rating
MADIS rating 92% QC OK
 

Latest daily graph:

Latest daily graph

There is a significant mean error in your dewpoint readings. You may need to calibrate your dewpoint sensor. The mean error of your daytime readings is significantly different to the mean error of your nighttime readings. In particular, the difference is 3.7 °F warmer during the night. This is often caused by poor siting of the sensor (e.g. under eves, in screen porch, or in thick tree coverage). For information on siting, see CWOP Station Guide.

Wind Vector

The wind vector is the average wind over the relevant period. Note that if the wind blows North for half the time at 2 knots, and then blows South for the other half of the time at 2 knots, then the result is zero -- i.e. North wind and South wind will cancel out. Over time, the direction of the wind and of the analysis should match pretty well. If the lengths of the vector are different, then it could mean either that your anemometer reads high or low, or that you are in a more shielded or more open space.
MADIS
rating
MADIS rating 99% QC OK
TodayLast 7 days
Wind vector chartWind vector chart for last 7 days

Neighboring Stations

This is a list of stations that are close to this station. Note that this is not the list of stations that are used in the data analysis. That list of stations is known only to MADIS. You can see all the stations at MADIS Data Display. Your station should be in the middle of the display. If you think that the analysis is incorrect, then maybe one of the close stations has failed.

You can look at those for comparison purposes. The average difference between your station and each station below is listed as well. This may allow you to detect local stations which are erroneous. You can also use these numbers to adjust your instruments -- especially if a number of ASOS stations have similar differences to your station. Also, try increasing the analysis period to more than the default 28 days. The difference is only given if both stations report reasonably often during each day. Some stations only report every 6 hours, and this makes the average of less interest. In this case, the average is not displayed. The values reported are the differences between this station and the neighboring station. I.e. if the difference is positive, then this station is reading higher than the neighboring station. Since this station has not been reporting continuously during the analysis period (it missed 16 days out of 28), the offsets below may not be accurate.

You can also subscribe to an RSS feed to tell you when new stations come online in this area. Choose either within 100 miles or 250 miles . For stations covered by your Forecast Office: Charleston (CHS) .

SiteDistanceLocationBarometerTemperatureDewpoint
GW50021.0 milesSouthwest CHARLESTON, SC, US (lat 32.8003°, long -79.9613°, altitude 2 metres) -4.5mb0.5°F-6.2°F
DW68262.9 milesSouthwest Charleston, SC, US (lat 32.7838°, long -79.9892°, altitude 3 metres) -4.1mb2.8°F-6.4°F
FW77733.3 milesEast Mount Pleasant, SC, US (lat 32.7990°, long -79.8967°, altitude 2 metres) -3.9mb2.1°F-8.2°F
GW11634.0 milesSouthwest CHARLESTON, SC, US (lat 32.7788°, long -80.0083°, altitude 6 metres) -4.8mb4.3°F-4.9°F
GW03665.7 milesSoutheast Charleston, SC, US (lat 32.7358°, long -79.9127°, altitude 3 metres) -4.2mb2.9°F-8.3°F
GW09126.1 milesNortheast Daniel Island, SC, US (lat 32.8898°, long -79.9020°, altitude 1 metres) -6.8mb4.3°F-6.9°F
FW81656.4 milesWest Charleston, SC, US (lat 32.8430°, long -80.0555°, altitude 10 metres) -4.7mb3.1°F-6.1°F
KG4QXF7.4 milesEast MT PLEASANT, SC, US (lat 32.8257°, long -79.8250°, altitude 4 metres) -6.6mb3.5°F-6.3°F
FW98987.5 milesNortheast Mount Pleasant, SC, US (lat 32.8540°, long -79.8332°, altitude 5 metres) -5.0mb3.1°F-7.6°F
WW1TA8.9 milesNortheast MOUNT PLEASANT, SC, US (lat 32.8743°, long -79.8177°, altitude 3 metres) -6.2mb3.7°F-5.3°F

Quality Control Notes

This page reports on the quality control checks performed by MADIS. The green check mark and red cross are chosen based on the average performance during the analysis period (which is selectable above). The red cross can appear even if MADIS reports that all observations pass the MADIS QC checks.

The 'MADIS rating' reports on the percentage of observations that pass the MADIS checks. You should aim for two thumbs up!

Location Formats

The location is shown in three different formats. Each of these is used in some software, and is shown on some websites.

Degrees Minutes Seconds: VWS/VWSAPRS, WeatherLink 5.5, WeatherLink (5.2-5.4), WeatherView (Linux)

Decimal degrees: FreeWX, WeatherView32 (PC application)

LORAN: WeatherDisplay, WUHU, Henriksen WServer

Resources

CWOP Home: This describes the whole CWOP program and has a large amount of useful information.

CWOP Siting Guide (PDF): This is a guide to siting and operating a CWOP station. This is a must-read document.

Another CWOP Guide (PDF): This is another guide to siting and operating a CWOP station. This is a must-read document.

Urban Siting and Operations (PDF): This is a guide to siting and operating a CWOP station in an urban environment.

APRS WX Message format: This describes the actual format of the messages transmitted that carry WX information.

WXQC Mailing List: This is a mailing list where data quality issues are discussed. Assistance with software configuration can often be found here.

Topo Map Reading Guide: How to read USGS topographic maps, with a good section on reading contours.

Geographically nearby web pages: Use Geourl to find web pages that deal with locations geographically close to this site.


Overall website comments, problems etc to Philip Gladstone
Page layout last modified Sunday, 28 February 2016
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