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.
The site location should be at the mark shown -- or very close. Clicking within the map area (or you can drag the 'EW2548' 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.
|2013-04-04||42.7997||-71.1322||60||Haverhill, MA US|
|2014-10-05||42.7997||-71.1322||60||Haverhill, MA, US|
There are no photographs of the station. If you are the site operator and have pictures of this location, then please email them to email@example.com.
You can try to find photographs from the area surrounding the site marker by clicking on Find nearby photographs.
The location reported in the weather reports (via APRS) is significantly different to the registered location above. In particular, the difference is about 1.1 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 findu.com.
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.
A reasonably recent weather report (1 days ago) received from this station was
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.
A recently received weather report from this station was
This report was seems to be a valid APRS record, but not a valid weather record.
|The wind vector is the average wind over the relevant period. Note that if the wind blows North for half the time at 2 knots, and then blows South for the other half of the time at 2 knots, then the result is zero -- i.e. North wind and South wind will cancel out. Over time, the direction of the wind and of the analysis should match pretty well. If the lengths of the vector are different, then it could mean either that your anemometer reads high or low, or that you are in a more shielded or more open space.|
|Today||Last 7 days|
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 22 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: Boston (BOX) .
|KC1ELF||2.2 miles||West||Haverhill, MA, US (lat 42.7982°, long -71.1757°, altitude 75 metres)|
|FW0837||4.8 miles||North||Hampstead, NH, US (lat 42.8675°, long -71.1497°, altitude 93 metres)|
|DW7229||4.8 miles||North||Hampstead, NH, US (lat 42.8685°, long -71.1409°, altitude 69 metres)|
|DW6903||5.0 miles||Southeast||Bradford, MA, US (lat 42.7525°, long -71.0572°, altitude 46 metres)|
|DW7873||5.5 miles||South||Lawrence, MA, US (lat 42.7213°, long -71.1482°, altitude 27 metres)|
|KLWM||6.0 miles||South||LAWRENCE MUNICIPAL AIRPORT, MA, United States (lat 42.7126°, long -71.1255°, altitude 45 metres)|
|CW3868||6.2 miles||Southwest||Methuen, MA, US (lat 42.7252°, long -71.2013°, altitude 35 metres)|
|EW6338||6.7 miles||East||West Newbury, MA, US (lat 42.7843°, long -71.0023°, altitude 38 metres)|
|DW5391||9.0 miles||Southeast||Boxford, MA, US (lat 42.6996°, long -71.0193°, altitude 50 metres)|
|DW8595||9.9 miles||West||Windham, NH, US (lat 42.8236°, long -71.3239°, altitude 96 metres)|
The 'MADIS rating' reports on the percentage of observations that pass the MADIS checks. You should aim for two thumbs up!
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 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.