CWOP Information for CW9271 (C9271) in Madison, NH, US

The following information is known about CW9271. 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: 43° 53' 26" N (deg min sec), 43.8906° (decimal), 4353.43N (LORAN)
Longitude: 71° 7' 18" W (deg min sec), -71.1217° (decimal), 07107.30W (LORAN)
Elevation: 290 metres (951 feet) -- validated against 288 metres (946 feet) from NED Contiguous U. S. 1/3E arc second elevation data
Location: Madison, NH, US
County: Carroll, NH
Forecast Office: Portland (GYX)
Weather station Manager/Operator: Eric
Station type/software: Davis Vantage Pro 2 Plus with Weatherlink

The site location should be at the mark shown -- or very close. Clicking within the map area (or you can drag the 'CW9271' 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.

APRS Status

No data has been seen recently from MADIS, but data is flowing into (from APRS). Your station may not be included in the region covered by MADIS. Sorry.

A recently received report from this station was


If this is not a weather report, then your station may not be transmitting weather reports, and this may be the problem. Check the recent reports at to see if any look like weather reports.

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APRS Location

APRS Location recorded at 2019-Jul-20 00:48 UTC
Latitude: 43° 54' 0" N (deg min sec), 43.9000° (decimal), 4354.00N (LORAN)
Longitude: 71° 6' 0" W (deg min sec), -71.1000° (decimal), 07106.00W (LORAN)

The location reported in the weather reports (via APRS) is significantly different to the registered location above. In particular, the difference is about 1.3 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

Data is being received for this station, but until the end of day processing has been run (about 12 hours after the end of the UTC day), the graphs will not appear.

Neighboring Stations

This is a list of stations that are close to this 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: Portland (GYX) .

CNWN37.1 milesNorth Saco River Near Conway, NH, United States Of America (lat 43.9908°, long -71.0914°, altitude 135 metres) (data present)
KIZG11.1 milesNortheast FRYEBURG EASTERN SLOPES RGNL, ME, United States (lat 43.9911°, long -70.9479°, altitude 138 metres) (data present)
DW720514.0 milesWest North Sandwich, NH, US (lat 43.8578°, long -71.3995°, altitude 247 metres) (data present)
EW282514.1 milesNorthwest Bartlett, NH, US (lat 44.0673°, long -71.2643°, altitude 256 metres) (data present)
FW128114.5 milesSoutheast Effingham, NH, US (lat 43.7000°, long -71.0000°, altitude 150 metres) (data present)
FW176915.4 milesNorth Intervale, NH, US (lat 44.1128°, long -71.1395°, altitude 760 metres) (data present)
EW791715.8 milesSouth Center Tuftonboro, NH, US (lat 43.6687°, long -71.1980°, altitude 323 metres) (data present)
N1MRE15.9 milesNortheast Demark, ME, US (lat 44.0197°, long -70.8587°, altitude 138 metres) (data present)
DW579017.5 milesSoutheast Parsonsfield, ME, US (lat 43.6950°, long -70.9000°, altitude 170 metres) (data present)
FW378418.8 milesSouthwest Moultonborough, NH, US (lat 43.6667°, long -71.3350°, altitude 170 metres) (data present)

The sites marked above thus did not report continuously during the analysis period, so the offsets may (probably will) not be accurate.

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 Eric
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