MesoWest Information for CHUMX in CHUM Lake Minchumina, AK, United States Of America

The following information is known about CHUMX. 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: 63° 52' 58" N (deg min sec), 63.8827° (decimal), 6352.96N (LORAN)
Longitude: 152° 18' 55" W (deg min sec), -152.3152° (decimal), 15218.91W (LORAN)
Elevation: 217 metres (711 feet) -- validated against 209 metres (686 feet) from Google
Location: CHUM Lake Minchumina, AK, United States Of America
Borough: Yukon-Koyukuk, AK
Data provider: USARRAY
Forecast Offices: Anchorage (AFC), Fairbanks (AFG)

The site location should be at the mark shown -- or very close. Clicking within the map area (or you can drag the 'CHUMX' 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 1 data source. 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. 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 27 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 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.


Average barometer error: -3.8 milliBars
Error standard deviation: 1.4 milliBars
Worst daily average barometer error: -6.9 milliBars
Mean error value of -3.8 exceeds limit of 2.0
MADIS rating 9% 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.

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 . For stations covered by your Forecast Office: Anchorage (AFC),Fairbanks (AFG) .

J20KX59.1 milesWest J20K Nowitna River, AK, United States Of America (lat 64.1767°, long -154.1467°, altitude 313 metres) 1.1mb
K20KX65.0 milesSouthwest K20K Telida, AK, United States Of America (lat 63.3569°, long -154.0700°, altitude 547 metres) 6.6mb
5Z5WC69.0 milesSoutheast Site 5Z5WC, AK, United States Of America (lat 63.4314°, long -150.3108°, altitude 1143 metres)
I21KX90.3 milesNorth I21K Tanana, AK, United States Of America (lat 65.1800°, long -151.9822°, altitude 247 metres) 0.8mb
HEAA2100.5 milesEast Healy, AK, United States Of America (lat 63.8704°, long -149.0141°, altitude 450 metres)
PAIN104.4 milesEast McKinley Park, McKinley National Park Airport, AK, United States (lat 63.7326°, long -148.9106°, altitude 524 metres) 6.2mb
KL1YC107.6 milesNortheast Nenana, AK, US (lat 64.5578°, long -149.0918°, altitude 108 metres) 1.0mb
PARY111.1 milesNorthwest Ruby AP, Ruby, AK, United States of America (lat 64.7308°, long -155.4630°, altitude 199 metres) -0.7mb
PAMC120.4 milesSouthwest MCGRATH AIRPORT, AK, United States (lat 62.9574°, long -155.6103°, altitude 103 metres) -0.4mb
PAPT124.6 milesSouth Puntilla, AK, United States (lat 62.0911°, long -152.7349°, altitude 560 metres)

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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