CWOP Information for DW9981 (D9981) in Dubuque, IA, US

The following information is known about DW9981. 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: 42° 27' 47" N (deg min sec), 42.4631° (decimal), 4227.78N (LORAN)
Longitude: 90° 46' 25" W (deg min sec), -90.7736° (decimal), 09046.41W (LORAN)
Elevation: 296 metres (971 feet) -- validated against 297 metres (974 feet) from NED 1/9th arc-second: East Central Counties Iowa
Location: Dubuque, IA, US
County: Dubuque, IA
Forecast Office: Quad Cities (DVN)
Weather station Manager/Operator: John
Station type/software: Meteobridge 4.4

The site location should be at the mark shown -- or very close. Clicking within the map area (or you can drag the 'DW9981' 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.

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.

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APRS Location

APRS Location recorded at 2020-Oct-21 00:28 UTC
Latitude: 42° 30' 3" N (deg min sec), 42.5007° (decimal), 4230.04N (LORAN)
Longitude: 90° 39' 53" W (deg min sec), -90.6647° (decimal), 09039.88W (LORAN)

The location reported in the weather reports (via APRS) is significantly different to the registered location above. In particular, the difference is about 6.1 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: 2020-09-24 to 2020-10-08.

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  

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 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: 11.2 milliBars
Error standard deviation: 16.3 milliBars
Worst daily average barometer error: 36.8 milliBars
Location problem
MADIS rating 54% QC OK
Sensor fails following checks:
L2 Statistical Spatial Consistency
L3 Spatial Consistency

Latest daily graph:

Latest daily graph

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.


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. Since this station has not been reporting continuously during the analysis period (it missed 15 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: Quad Cities (DVN) .

KDBQ5.6 milesSoutheast DUBUQUE REGIONAL AIRPORT, IA, United States (lat 42.3984°, long -90.7091°, altitude 329 metres) -34.6mb
KPVB23.1 milesNortheast Platteville Muni, Platteville, WI, United States of America (lat 42.6909°, long -90.4412°, altitude 312 metres) -34.5mb
KMXO25.9 milesSouthwest Monticello Municipal, IA, United States (lat 42.2204°, long -91.1604°, altitude 259 metres) -34.6mb
DW547339.3 milesEast Winnebago, IL, US (lat 42.3492°, long -90.0202°, altitude 287 metres) -35.0mb
KMRJ40.3 milesNortheast Mineral Point, Iowa County Airport, WI, United States (lat 42.8875°, long -90.2315°, altitude 356 metres) -34.2mb
KPDC42.3 milesNorthwest Prairie Du Chien, Prairie Du Chien Municipal Airport, WI, United States (lat 43.0194°, long -91.1211°, altitude 201 metres) -33.6mb
KSFY44.6 milesSoutheast Savanna, Tri-Township Airport, IL, United States (lat 42.0454°, long -90.1101°, altitude 188 metres) -34.5mb
CW021648.0 milesSoutheast Mt. Carroll, IL, US (lat 42.0921°, long -89.9818°, altitude 225 metres) -33.6mb
KOVS48.2 milesNorth BOSCOBEL AIRPORT, WI, United States (lat 43.1561°, long -90.6775°, altitude 205 metres) -34.3mb
KCWI49.3 milesSoutheast Clinton, Clinton Municipal Airport, IA, United States (lat 41.8295°, long -90.3328°, altitude 216 metres) -35.4mb

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 John
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