METAR/Synop Information for CWFD (71094) in Cape Dyer, N. W. T., Canada

The following information is known about CWFD. 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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Registered Location

Latitude: 66° 39' 28" N (deg min sec), 66.6578° (decimal), 6639.47N (LORAN)
Longitude: 61° 21' 34" W (deg min sec), -61.3594° (decimal), 06121.57W (LORAN)
Elevation: 725 metres (2379 feet) -- validated against 720 metres (2363 feet) from Google
WMO Id: 71094
Location: Cape Dyer, N. W. T., Canada

The site location should be at the mark shown -- or very close. Clicking within the map area (or you can drag the 'CWFD' 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 13 data sources. This position has been modified based on user feedback.

Show location history.

There are no photographs of the station. If you 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.

Data Status

Data has been seen on each of the last 54 analyzed days.

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 56 days. Change analysis period to Last 3 days  Last 7 days  Last 14 days  Last 4 weeks  Last 13 weeks  Last 26 weeks  Last 39 weeks  Last 52 weeks  

By default, the longer analysis periods display graphs that show the long term performance of this station. The graphs show the mean error over time, and include error bars which are one standard deviation long. This provides an easy way to see if there are any underlying trends in the data. Note that a 'step' in your data does not (necessarily) mean that something happened to your station. It could mean that another station came online in the local area, and they are changing the analysis.

The analysis is performed by MADIS. This web page just provides visualization of the data that MADIS produces. There are a number of very knowledgeable people who participate on the WXQC Mailing List who do understand exactly how MADIS works and can resolve issues when the analysis seems to be broken. However, in most cases, the station readings are at fault, or the software that is transmitting the data to CWOP. Please check those paths first.

You can also see how this station compares with other stations.

The MADIS system is performing analysis for a different location than the location above (it is 8.9 miles away). This means that the analyzed readings for this location may be incorrect, probably leading to errors being shown below.

A recently received weather report from this station was


Average barometer error: 5.3 milliBars
Error standard deviation: 9.1 milliBars
Worst daily average barometer error: 24.2 milliBars
Worst daily standard deviation: 29.6 milliBars
Location problem
MADIS rating 40% QC OK
Sensor fails following checks:
L2 Statistical Spatial Consistency
L3 Spatial Consistency

The standard deviation of your readings is higher than expected. This can be caused by a broken sensor that always reports the same value. It can be caused by a faulty sensor that sometimes reports values way out of range (such as 0). Check that your sensor is operating correctly.


  24 hours  Day time  Night time
Average temperature error5.5 °F0.7 °F5.7 °F
Error standard deviation4.4 °F2.1 °F4.2 °F
Worst average temperature error11.1 °F-1.0 °F11.1 °F
Worst standard deviation3.1 °F0.0 °F3.2 °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.

MADIS rating 99% QC OK

It appears that your station is sited in a location where cool air collects at night. This is often near the bottom of a valley. The cool nighttime readings are probably correct, and the analysis values are not taking into account the local topography.

Dewpoint -- or switch to Relative Humidity

  24 hours  Day time  Night time
Average dewpoint error3.4 °F0.6 °F3.5 °F
Error standard deviation4.9 °F2.1 °F4.8 °F
Worst average dewpoint error17.3 °F-1.0 °F17.3 °F
Worst standard deviation13.0 °F0.0 °F13.0 °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.

  Location problem
MADIS rating 98% QC OK

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.


Sometimes, larger than expected values of the standard deviation can be caused by the analysis process itself. If there is a stuck sensor on a neighboring station, this can cause a 'sawtooth' or 'jaggy' analysis. This will cause the standard deviation to be higher than it ought to be. If this happens to your station, then please ignore the warnings above. The analysis process is being upgraded to try and eliminate these problems.

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.

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 .

CWVD89.2 milesNorthwest Broughton Island, Canada (lat 67.5356°, long -63.7889°, altitude 584 metres) -2.0mb0.5°F-0.6°F
CYVM94.6 milesNorthwest Broughton Island Airport, Canada (lat 67.5458°, long -64.0314°, altitude 6 metres)
CZVM94.7 milesNorthwest Qikiqtarjuaq|Broughton Island ( -1998) Climate, NU, Canada (lat 67.5475°, long -64.0333°, altitude 6 metres)
CWXP125.6 milesWest Pangnirtung, Canada (lat 66.1433°, long -65.7114°, altitude 23 metres) 6.5°F-2.6°F
CYXP125.6 milesWest Pangnirtung Airport, Canada (lat 66.1450°, long -65.7136°, altitude 23 metres)
CWUP191.0 milesNorthwest Cape Hooper, N. W. T., Canada (lat 68.4617°, long -66.8409°, altitude 390 metres) -2.5mb5.6°F
04228212.6 milesNortheast Agto Kitsigssut, -, Greenland (lat 67.7842°, long -53.9650°, altitude 11 metres)
CWOB243.5 milesSouth Brevoort Island, Canada (lat 63.3397°, long -64.1458°, altitude 376 metres) -3.5mb1.2°F-6.8°F
CYFB289.2 milesSouthwest Iqaluit, N. W. T., Canada (lat 63.7564°, long -68.5558°, altitude 34 metres) -8.0mb7.7°F-3.4°F
CXFB289.5 milesSouthwest Iqaluit Climate, NU, Canada (lat 63.7472°, long -68.5444°, altitude 33 metres) 7.9°F-3.3°F

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

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


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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