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 firstname.lastname@example.org.
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.
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.
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.
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.
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)|
|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)|
|DW0555||8.2 miles||Northeast||Newton, NH, US (lat 42.8933°, long -71.0345°, altitude 38 metres)|
|DW8595||9.9 miles||West||Windham, NH, US (lat 42.8236°, long -71.3239°, altitude 96 metres)|
|EW0362||11.2 miles||West||Londonderry, NH, US (lat 42.8325°, long -71.3492°, altitude 65 metres)|
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.