CWOP Information for CW7692 (C7692) in Eldora, IA US

The following information is known about CW7692. 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° 19' 5" N (deg min sec), 42.3180° (decimal), 4219.08N (LORAN)
Longitude: 93° 5' 53" W (deg min sec), -93.0980° (decimal), 09305.88W (LORAN)
Elevation: 1082 meters (3550 feet)
Location: Eldora, IA US
County: Hardin, IA
Forecast Office: Des Moines (DMX)
Station type/software: Weather Display / WMR100

The elevation does not correspond with the estimated elevation (305 meters (1000 feet) -- source NED Contiguous U. S. 1/3E arc second elevation data) 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 location should be at the mark shown -- or very close. Clicking within the map area (or you can drag the 'CW7692' 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.

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 upload them to Flickr (detailed instructions) and add the two tags 'wxtagged' and 'wx:cwop=c7692'. If the picture is of the weather station itself, then please also add the 'wx:station' tag as well.

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 28 analyzed days.

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.

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.

Barometer

Average barometer error: 36.4 milliBars
Error standard deviation: 0.5 milliBars
Worst daily average barometer error: 37.2 milliBars
Location problem
 
MADIS
rating
MADIS rating 0% QC OK
Sensor fails L2 statistical
consistency check.
 

Latest daily graph:

Latest daily graph

There is a significant mean error in your barometer readings. You may need to calibrate your barometer. Since your readings are low, it is possible that your software is not adjusting the reading for elevation, or that your station altitude has been entered incorrectly into your software.

Temperature

  24 hours  Day time  Night time
Average temperature error-16.5 °F-18.2 °F-15.0 °F
Error standard deviation3.9 °F3.4 °F3.6 °F
Worst average temperature error-21.8 °F-23.2 °F-21.8 °F
Worst standard deviation5.1 °F4.4 °F4.8 °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
MADIS rating 47% QC OK
Sensor fails L2 statistical
consistency check.
 

Latest daily graph:

Latest daily graph

The values returned by your sensor indicate a system problem. This can be caused by a 'stuck' sensor that always reports the same value. Please check your station for proper operation.

Dewpoint -- or switch to Relative Humidity

  24 hours  Day time  Night time
Average dewpoint error0.1 °F2.3 °F-1.6 °F
Error standard deviation5.7 °F6.0 °F4.8 °F
Worst average dewpoint error7.6 °F-9.3 °F-11.2 °F
Worst standard deviation8.3 °F7.6 °F5.7 °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
MADIS rating 100% QC OK
 

Latest daily graph:

Latest daily graph

The mean error of your daytime readings is significantly different to the mean error of your nighttime readings. In particular, the difference is 3.9 °F warmer during the night. This is often 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.

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.

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: Des Moines (DMX) .

SiteDistanceLocationBarometerTemperatureDewpoint
KIFA13.7 milesNorthwest Iowa Falls Muni, IA, United States (lat 42.4708°, long -93.2700°, altitude 347 meters) -37.1mb18.1°F1.6°F
KMIW16.9 milesSoutheast Marshalltown, IA, United States (lat 42.1127°, long -92.9178°, altitude 296 meters) -36.8mb18.1°F0.7°F
CW854227.2 milesWest Story City, IA US (lat 42.1861°, long -93.5988°, altitude 310 meters) -35.4mb15.7°F-0.4°F
KAMW35.1 milesSouthwest Ames, IA, United States (lat 41.9920°, long -93.6218°, altitude 291 meters) -37.0mb18.3°F0.3°F
CW286537.3 milesWest Webster City, IA US (lat 42.4495°, long -93.8053°, altitude 341 meters) 3.2mb14.9°F1.3°F
KALO39.3 milesNortheast Waterloo Municip, IA, United States (lat 42.5571°, long -92.4003°, altitude 264 meters) -36.7mb18.3°F0.7°F
KEBS40.2 milesWest Webster City, IA, United States (lat 42.4366°, long -93.8689°, altitude 341 meters) -36.5mb16.6°F1.0°F
KBNW42.7 milesSouthwest Boone Muni, IA, United States (lat 42.0496°, long -93.8476°, altitude 353 meters) -36.9mb15.1°F-0.8°F
CW678843.1 milesSouth Newton, IA US (lat 41.6965°, long -93.0395°, altitude 287 meters) -36.8mb15.3°F-2.5°F
N0YKX43.2 milesSouthwest Boone, IA US (lat 42.0562°, long -93.8623°, altitude 354 meters) -36.9mb14.8°F0.4°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

Resources

CWOP Home: This describes the whole CWOP program and has a large amount of useful information.

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.


Website comments, problems etc to
Philip Gladstone

Last modified Monday, 01 September 2008
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