MesoWest Information for TWB50 in Sloan Ranch San Saba, TX, United States Of America (site inactive)

The following information is known about TWB50. 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.

For development purposes only
Sorry, we have no imagery here.
For development purposes only
Sorry, we have no imagery here.
TWB50
EW9845
FW6692
FW0014
EW4824
FW7339
GW2259
GW1209
KK2Z-13
DW8578
EW8476
DW1232
KM5R
N0PFE-1
KJ4EBE
FW1286
W5DNT
CW2989
FW4298
EW0158
GW3716
FW1742
FW4466
CW4490
FW6832
GW0683
EW4538
EW2975
FW1310
CW9790
EW2327
FW7040
GW3962
W5SDC
DW8923
GW6021
FW2312
EW2672
EW8108
GW4857
DW2047
AD5L
EW6623
FW7010
FW7496
FW8733
K5KEL
GW1429
GW1076
N5ZKK
KI5KMR-13
DW1850
EW6460
FW2996
FW2035
GW2975
GW4266
EW8876
DW9345
KI5QWQ
DW6536
DW6780
FW7818
CW3077
GW2822
EW7906
DW9750
CW6261
FW7988
EW4696
GW2345
KC5MUJ-1
EW1067
EW5170
EW1970
FW9766
GW1201
GW2364
KC5EZZ-4
FW1991
EW3767
EW6452
GW5374
K5NCO
FW6030
EW4907
GW2326
EW3105
EW3714
GW5789
CW0146
EW3675
EW0214
CW3007
DW1389
EW8332
GW0058
FW8366
FW7478
EW8274
FW6620
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Registered Location

Latitude: 31° 4' 44" N (deg min sec), 31.0788° (decimal), 3104.73N (LORAN)
Longitude: 98° 51' 26" W (deg min sec), -98.8571° (decimal), 09851.43W (LORAN)
Elevation: 522 metres (1713 feet) -- validated against 505 metres (1657 feet) from Geonames
Location: Sloan Ranch San Saba, TX, United States Of America
County: San Saba, TX
Data provider: TWDB
Forecast Office: San Angelo (SJT)

The site location should be at the mark shown -- or very close. Clicking within the map area (or you can drag the 'TWB50' 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.

There are no photographs of the station. If you have pictures of this location, then please email them to twb50@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 2025-03-15.

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: -2.5 milliBars
Error standard deviation: 0.5 milliBars
Worst daily average barometer error: -3.2 milliBars
Mean error value of -2.5 exceeds limit of 2.0
 
MADIS
rating
MADIS rating 14% QC OK
Sensor fails following checks:
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.

Temperature

  24 hours  Day time  Night time
Average temperature error6.6 °F5.3 °F7.6 °F
Error standard deviation17.9 °F16.6 °F18.8 °F
Worst average temperature error50.9 °F52.0 °F50.5 °F
Worst standard deviation2.8 °F3.7 °F2.2 °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.

  Both day (mean error 5.3, sd 16.6) and night (mean error 7.6, sd 18.8) values out of range
 
MADIS
rating
MADIS rating 86% QC OK
 

Latest daily graph:

Latest daily graph

The values returned by your sensor indicate a system problem. This can be caused by a 'stuck' sensor that always reports the same value. Please check your station for proper operation.

Dewpoint -- or switch to Relative Humidity

  24 hours  Day time  Night time
Average dewpoint error15.6 °F13.1 °F17.4 °F
Error standard deviation30.4 °F27.2 °F32.7 °F
Worst average dewpoint error89.6 °F85.2 °F93.3 °F
Worst standard deviation5.5 °F5.5 °F3.6 °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.

  Temperature problem
 
MADIS
rating
MADIS rating 86% QC OK
 

Latest daily graph:

Latest daily graph

Your readings are not within an acceptable error range. The automated problem analysis cannot identify the problem. You can signup on the wxqc mailing list and post information about this situation there. This is may be 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 94% 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 17 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: San Angelo (SJT) .

SiteDistanceLocationBarometerTemperatureDewpoint
FW669233.7 milesEast Lampasas, TX, US (lat 31.1155°, long -98.2905°, altitude 380 metres) 5.4mb-18.4°F-44.8°F
FW733938.7 milesSoutheast Kingsland, TX, US (lat 30.6405°, long -98.4518°, altitude 257 metres) 4.2mb-19.3°F-47.1°F
GW225941.4 milesWest HEXT, TX, US (lat 30.8923°, long -99.5205°, altitude 558 metres) 6.2mb-21.8°F-39.0°F
GW120944.1 milesNorth EARLY, TX, US (lat 31.7167°, long -98.8778°, altitude 424 metres) 5.5mb-17.5°F-40.1°F
DW857847.8 milesEast Lampasas, TX, US (lat 31.0762°, long -98.0498°, altitude 303 metres) 5.5mb-18.8°F-45.9°F
N0PFE-155.3 milesSoutheast Marble Falls, TX, US (lat 30.4725°, long -98.2508°, altitude 324 metres) 4.6mb-20.1°F-43.1°F
FW128659.7 milesEast Florence, TX, US (lat 30.7922°, long -97.9082°, altitude 329 metres) 5.3mb-18.3°F-47.3°F
FW429862.5 milesSoutheast LIBERTY HILL, TX, US (lat 30.6876°, long -97.9088°, altitude 313 metres) 4.4mb-18.0°F-48.3°F
EW015863.3 milesSouthwest Harper, TX, US (lat 30.2593°, long -99.3310°, altitude 692 metres) 5.2mb-23.5°F-43.7°F
EW297566.6 milesEast Killeen, TX, US (lat 31.0580°, long -97.7325°, altitude 278 metres) 6.7mb-19.0°F-46.0°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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