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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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The elevation does not correspond with the estimated elevation (436 meters (1431 feet) -- source SRTM.C_1TO19_3) at that point. Either the location or the elevation (or both) are almost certain to be incorrect. Use the mapper to check the location. Please use the 'send the updated information' link below to update the location or elevation.
The site coordinates appear to be of low precision, and the station may be anywhere within the marked area. Clicking within the map area (or you can drag the 'CWLY' 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 meters. Note that handheld GPS receivers do not provide readings of elevation accurate to better than 10-20 meters (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.
The location information for this site was gathered from 6 data sources. 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.
Latitude: dummy (deg min sec), dummy (decimal), dummy (LORAN)
Longitude: dummy (deg min sec), dummy (decimal), dummy (LORAN)
Estimated elevation is dummy meters (dummy feet) from dummy.
The station (or view from the station) is shown here. You can choose the view direction to see the surroundings. Other information (and somewhat larger images) can be found by clicking on the picture.
You can try to find photographs from the area surrounding the site marker by clicking on Find nearby photographs. (There are some) (There are none) (There may be some) (Automatically loaded if any)
Status: Status: None found.Clicking on the map above will redo the search centered on the clicked point.
If any images are of the weather station, then please click on those images, and add the 'wxtagged' and 'wx:metar=cwly' tags to those images. For the station itself, please add the 'wx:station' tag as well. Some users do not permit other users to add tags to their images. In these cases, just add a comment to the picture asking the photographer to add the tags themselves.
Clicking on the map above will redo the search centered on the clicked point.
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.
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Latest daily graph:
These values are within range, so your sensor is probably calibrated correctly.
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. |
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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.
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. |
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Latest daily graph:
These values are within the acceptable range. This probably means that your sensor is sited correctly and is calibrated correctly.
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.
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 .
| Site | Distance | Location | Barometer | Temperature | Dewpoint | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| CVLY | 0.0 miles | South | Lytton Rcs, Canada (lat 50.2167°, long -121.5667°, altitude 225 meters) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
DW1184| 3.3 miles | Northwest | | Lytton, BC CA (lat 50.2547°, long -121.6113°, altitude 260 meters)
| 0.5mb | -1.0°F | 0.9°F
| CW4376 | 20.1 miles | North | | Askom Valley, BC CA (lat 50.4937°, long -121.7046°, altitude 370 meters)
| -1.5mb | -1.9°F | 3.1°F
| CWKF | 36.1 miles | Northwest | | Lillooet, Canada (lat 50.6833°, long -121.9333°, altitude 235 meters)
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| CWGP | 51.9 miles | West | | Pemberton Arpt, BC, Canada (lat 50.3000°, long -122.7333°, altitude 204 meters)
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| CYHE | 58.9 miles | South | | Hope, BC, Canada (lat 49.3667°, long -121.4833°, altitude 39 meters)
| -1.1mb | -0.5°F | -5.8°F
| CZKA | 59.5 miles | Northeast | | Kamloops, CA (lat 50.7000°, long -120.4500°, altitude 345 meters)
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| CYKA | 59.7 miles | Northeast | | Kamloops, BC, Canada (lat 50.7022°, long -120.4444°, altitude 346 meters)
| -0.7mb | -0.9°F | 4.1°F
| CVOA | 61.5 miles | West | | Whistler Mountain High Level, Canada (lat 50.0667°, long -122.9333°, altitude 1628 meters)
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| CVOH | 61.5 miles | West | | Whistler Mountain High Level R, Canada (lat 50.0667°, long -122.9333°, altitude 1643 meters)
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The sites marked above thus did not report continuously during the analysis period, so the offsets may (probably will) not be accurate.
The 'MADIS rating' reports on the percentage of observations that pass the MADIS checks. You should aim for two thumbs up!
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 Guide (PDF): This is a guide to siting and operating a CWOP station. This is a must-read document.
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.
