CWOP Information for EW8173 (E8173) in Terrebonne, OR, US

The following information is known about EW8173. 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: 44° 26' 43" N (deg min sec), 44.4452° (decimal), 4426.71N (LORAN)
Longitude: 121° 17' 34" W (deg min sec), -121.2928° (decimal), 12117.57W (LORAN)
Elevation: 915 metres (3001 feet)
Location: Terrebonne, OR, US
County: Jefferson, OR
Forecast Office: Pendleton (PDT)
Weather station Manager/Operator: Kevin
Station type/software: Davis Vantage Pro 2/Vue with Weatherlink-IP

The elevation does not correspond with the estimated elevation (865 metres (2839 feet) -- source Google) 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 'EW8173' 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. Show location history.

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.

Data Status

Over the last 28 days, no data was seen on the following dates: 2019-06-27 to 2019-07-17.

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


Average barometer error: -3.7 milliBars
Error standard deviation: 1.0 milliBars
Worst daily average barometer error: -4.3 milliBars
Location problem
MADIS rating 2% 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. Your station is at a high elevation and you are using Weatherlink. The pressure reduction algorithm used in this software does not produce the results required for CWOP. This gives problems when the temperature changes and makes it impossible to get consistent calibration.


  24 hours  Day time  Night time
Average temperature error-1.0 °F0.4 °F-2.8 °F
Error standard deviation2.5 °F2.2 °F1.5 °F
Worst average temperature error-1.6 °F-1.0 °F-4.0 °F
Worst standard deviation2.9 °F2.5 °F1.4 °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

Latest daily graph:

Latest daily graph

It appears that your station is sited near the edge of a large urban area. This causes the analysis values to be lowered than expected as the quality control system does not take the location of the urban area into account.

Dewpoint -- or switch to Relative Humidity

  24 hours  Day time  Night time
Average dewpoint error3.3 °F3.5 °F2.4 °F
Error standard deviation3.6 °F3.9 °F3.5 °F
Worst average dewpoint error4.3 °F5.4 °F3.1 °F
Worst standard deviation4.0 °F4.1 °F3.9 °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 88% 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 100% 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 21 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: Pendleton (PDT) .

FW51630.1 milesSouthwest Crooked River Ranch, OR, US (lat 44.4437°, long -121.2940°, altitude 870 metres) 101.5mb3.4°F-10.2°F
FW40926.7 milesSouth Terrebonne, OR, US (lat 44.3497°, long -121.2700°, altitude 878 metres) -1.3mb2.7°F-11.2°F
N6DQX12.5 milesSouth Redmond, OR, US (lat 44.2658°, long -121.2667°, altitude 922 metres) 1.7mb-0.0°F-11.9°F
FW152614.1 milesSouth Redmond, OR, US (lat 44.2433°, long -121.2488°, altitude 933 metres) 0.2mb2.6°F-12.3°F
KRDM15.1 milesSoutheast REDMOND ROBERTS FIELD, OR, United States (lat 44.2559°, long -121.1406°, altitude 938 metres) 0.1mb1.7°F-8.4°F
K6K515.6 milesSouthwest Sisters Eagle Air, OR, United States of America (lat 44.3046°, long -121.5392°, altitude 965 metres) 0.8mb4.0°F-10.0°F
CW550717.9 milesWest Camp Sherman, OR, US (lat 44.4372°, long -121.6560°, altitude 920 metres) 1.3mb5.3°F-8.3°F
KG7ADK19.0 milesSouthwest Sisters, OR, US (lat 44.2938°, long -121.6137°, altitude 1037 metres) 1.3mb3.6°F-8.8°F
KS3922.1 milesSoutheast Prineville AP, Prineville, OR, United States of America (lat 44.2870°, long -120.9038°, altitude 990 metres) 0.0mb2.6°F-8.1°F
KBDN24.7 milesSouth Bend Municipal Airport, OR, United States of America (lat 44.0950°, long -121.2000°, altitude 1055 metres) -0.1mb-0.4°F-8.6°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
Questions for this weather station owner/operator to Kevin
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