CWOP Information for CW6438 (C6438) in Sunnyvale, CA, US (site inactive)

The following information is known about CW6438. 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: 37° 20' 56" N (deg min sec), 37.3490° (decimal), 3720.94N (LORAN)
Longitude: 122° 1' 35" W (deg min sec), -122.0263° (decimal), 12201.58W (LORAN)
Elevation: 39 metres (128 feet) -- validated against 49 metres (162 feet) from NED Contiguous U. S. 1/3W arc second elevation data
Location: Sunnyvale, CA, US
County: Santa Clara, CA
Forecast Office: San Francisco Bay Area (MTR)
Weather station Manager/Operator: Taneli
Station type/software: Open2300 version 1.10 / LaCrosse 23xx

The site location should be at the mark shown -- or very close. Clicking within the map area (or you can drag the 'CW6438' 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. Please check at to see if your data is being seen there.

Weather data was seen at around 3125 days ago on 2015-05-11.

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.

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: San Francisco Bay Area (MTR) .

2789P0.1 milesSoutheast Cheshire Way, CA, United States Of America (lat 37.3481°, long -122.0244°, altitude 47 metres)
1195P0.1 milesSouthwest south central Sunnyvale, CA, United States Of America (lat 37.3481°, long -122.0285°, altitude 52 metres)
FW94220.5 milesNortheast Sunnyvale, CA, US (lat 37.3553°, long -122.0217°, altitude 45 metres) (data present)
1017P0.5 milesNortheast Sunnyarts, CA, United States Of America (lat 37.3554°, long -122.0213°, altitude 39 metres)
EW89450.6 milesSouth Sunnyvale, CA, US (lat 37.3400°, long -122.0283°, altitude 59 metres) (data present)
1279P0.8 milesWest Bend Dr, CA, United States Of America (lat 37.3512°, long -122.0401°, altitude 53 metres)
3118P0.9 milesNorthwest Dawn Dr., CA, United States Of America (lat 37.3604°, long -122.0332°, altitude 39 metres)
EW39231.2 milesSouth Cupertino, CA, US (lat 37.3320°, long -122.0270°, altitude 64 metres) (data present)
DW01861.9 milesSouthwest Sunnyvale, CA, US (lat 37.3360°, long -122.0575°, altitude 84 metres) (data present)
GW41102.2 milesNorthwest SUNNYVALE, CA, US (lat 37.3767°, long -122.0477°, altitude 35 metres) (data present)

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 Taneli
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