CWOP Information for CW0126 (C0126) in Machynlleth, UK

The following information is known about CW0126. 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.

Location Map: If this message persists, then your browser is not compatible with Google Maps.
  Larger  Smaller  Google Earth.

Registered Location

Latitude: 52° 40' 8" N (deg min sec), 52.6688° (decimal), 5240.13N (LORAN)
Longitude: 3° 48' 33" W (deg min sec), -3.8092° (decimal), 00348.55W (LORAN)
Elevation: 92 metres (302 feet)
Location: Machynlleth, UK
Weather station Manager/Operator: Antony
Station type/software: Cumulus/DsVP

The elevation does not correspond with the estimated elevation (301 metres (988 feet) -- source SRTM.C_1TO19_3) at that point. Either the location or the elevation (or both) are almost certain to be incorrect. Please use the 'send the updated information' link below to update the location or elevation.

The site location should be at the mark shown -- or very close. Clicking within the map area (or you can drag the 'CW0126' 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.

The best way to get elevation is to consult a topographic map. Make sure that you know whether the contours are marked in feet or metres. Note that handheld GPS receivers do not provide readings of elevation accurate to better than 10-20 metres (technical discussion). If you do not have access to a topographic map, then a GPS receiver is acceptable, but make sure that it is operating in 3D mode and let it average the position for at least five minutes.

For more information on reading maps, please see the Topo Map Reading Guide -- in particular it discusses how to read contours.

NOTE: The Registered Location is the location that the station owner provided when they signed up with CWOP.

There are no photographs of the station. If you are the site operator and have pictures of this location, then please email them to

You can try to find photographs from the area surrounding the site marker by clicking on Find nearby photographs.

Location Map: If this message persists, then your browser is not compatible with Google Maps.
  Larger  Smaller  

APRS Location

APRS Location recorded at 2018-Sep-20 00:30 UTC
Latitude: 52° 40' 14" N (deg min sec), 52.6705° (decimal), 5240.23N (LORAN)
Longitude: 3° 48' 59" W (deg min sec), -3.8163° (decimal), 00348.98W (LORAN)

The location reported in the weather reports (via APRS) is significantly different to the registered location above. In particular, the difference is about 0.3 miles. If you have changed your location (or software) since the time above, then this can be a false alarm. Check the location currently being reported at

Please check which location is correct. If the registered location is incorrect, then you can correct it by dragging the marker above and using the 'send the updated information link'. If the APRS location is incorrect, then you must enter the correct coordinates into your software which generates the weather report (APRS) messages. Note that the various different types of software take the location in different formats, so be sure to use the correct format when entering the latitude and longitude.

Data Status

Over the last 28 days, no data was seen on the following dates: 2018-09-15.

The last 24 hours of weather data can be viewed at Findu. This page also provides access to the raw APRS packets and various other APRS related tools.

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  

The inconsistency noted above in your location information means that the analyzed readings for your location may be incorrect. For example, if your location is incorrect, then the analysis values will be for a location other than your station. This will give different analysis results, probably leading to errors being shown below. If the elevation is incorrect, then the comparison of temperature readings will be in error.

A recently received weather report from this station was


Latest daily graph:

Latest daily graph

Dewpoint -- or switch to Relative Humidity

Latest daily graph:

Latest daily graph

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.
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. 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 1 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 .

0341015.7 milesNortheast Lake Vyrnwy Automated, WLS, United Kingdom of Great Britain & N. Ireland (lat 52.7573°, long -3.4654°, altitude 360 metres) -2.4°F-92.7°F
0340919.0 milesNortheast Bala, United Kingdom Of Great Britain And Northern Ireland (lat 52.9076°, long -3.5844°, altitude 163 metres) -1.1°F-92.9°F
0350323.2 milesSouth Trawscoed, WLS, United Kingdom of Great Britain & N. Ireland (lat 52.3442°, long -3.9481°, altitude 63 metres) -0.0°F-94.8°F
0330529.9 milesNorth Capel Curig Automated, WLS, United Kingdom of Great Britain & N. Ireland (lat 53.0941°, long -3.9415°, altitude 216 metres) -1.3°F-92.7°F
0330147.2 milesNorthwest RAF Mona, WLS, United Kingdom of Great Britain & N. Ireland (lat 53.2600°, long -4.3761°, altitude 60 metres) -0.2°F-94.7°F
EGOS48.7 milesEast Shawbury, United Kingdom (lat 52.7947°, long -2.6647°, altitude 76 metres) -1.1°F-94.3°F
EGFA48.7 milesSouthwest Westwales Aberporth, WLS, United Kingdom of Great Britain & N. Ireland (lat 52.1394°, long -4.5711°, altitude 133 metres) -1.8°F-94.9°F
0352048.8 milesSoutheast Shobdon, ENG, United Kingdom of Great Britain & N. Ireland (lat 52.2429°, long -2.8859°, altitude 99 metres) -1.9°F-94.4°F
EGNR49.0 milesNortheast Hawarden, United Kingdom (lat 53.1747°, long -2.9873°, altitude 10 metres) -2.5°F-94.0°F
EGOV50.5 milesNorthwest Valley, United Kingdom (lat 53.2527°, long -4.5365°, altitude 11 metres) -0.6°F-95.6°F

The sites marked above thus did not report continuously during the analysis period, so the offsets may (probably will) not be accurate.

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


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
Questions for this weather station owner/operator to Antony
This page is one of 88065 similar pages. This one was generated in 0.10 seconds.