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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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The site location should be at the mark shown -- or very close. Clicking within the map area (or you can drag the 'CW4264' 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.
Latitude: dummy (deg min sec), dummy (decimal), dummy (LORAN)
Longitude: dummy (deg min sec), dummy (decimal), dummy (LORAN)
Estimated elevation is dummy meters (dummy feet) from dummy.
There are no photographs of the station. If you are the site operator and have pictures of this location, then please upload them to Flickr (detailed instructions) and add the two tags 'wxtagged' and 'wx:cwop=c4264'. If the picture is of the weather station itself, then please also add the 'wx:station' tag as well.
You can try to find photographs from the area surrounding the site marker by clicking on Find nearby photographs. (There are some) (There are none) (There may be some) (Automatically loaded if any)
Status: Status: None found.Clicking on the map above will redo the search centered on the clicked point.
Clicking on the map above will redo the search centered on the clicked point.
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The location reported in the weather reports (via APRS) is significantly different to the registered location above. In particular, the difference is about 3.7 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.
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.
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Latest daily graph:
These values are within range, so your sensor is probably calibrated correctly.
NOTE: If the error above is POSITIVE, then it means that the analysis temperature is HIGHER than the reported temperature. This means that your sensor is reading COLDER than expected. |
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Latest daily graph:
These values are within the acceptable range. This probably means that your sensor is sited correctly and is calibrated correctly.
NOTE: If the error above is POSITIVE, then it means that the analysis temperature is HIGHER than the reported temperature. This means that your sensor is reading COLDER than expected. |
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Latest daily graph:
These values are within the acceptable range. This probably means that your sensor is sited correctly and is calibrated correctly.
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.
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: Baltimore/Washington (LWX) .
| Site | Distance | Location | Barometer | Temperature | Dewpoint | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| CW7199 | 1.7 miles | South | Middletown, MD US (lat 39.4123°, long -77.5474°, altitude 146 meters) | -3.3mb | -1.4°F | -1.1°F | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
CW7257| 5.7 miles | East | | Frederick, MD US (lat 39.4280°, long -77.4437°, altitude 110 meters)
| -1.7mb | -0.9°F | -1.9°F
| CW8750 | 5.8 miles | North | | Myersville, MD US (lat 39.5167°, long -77.5133°, altitude 375 meters)
| -0.0mb | -3.1°F | 0.7°F
| KFDK | 9.4 miles | East | | Frederick Arpt, MD (lat 39.4176°, long -77.3743°, altitude 92 meters)
| -2.1mb | -1.5°F | 2.5°F
| DW0109 | 11.2 miles | West | | Sharpsburg, MD US (lat 39.4490°, long -77.7588°, altitude 146 meters)
| -0.5mb | -0.1°F | -1.7°F
| DW0407 | 12.1 miles | East | | Walkersville, MD US (lat 39.4838°, long -77.3302°, altitude 308 meters)
| -0.4mb | -4.0°F | -0.2°F
| CW5498 | 12.1 miles | South | | Lovettsville, VA US (lat 39.2637°, long -77.5838°, altitude 132 meters)
| -1.0mb | -1.2°F | -0.4°F
| CW1459 | 13.8 miles | North | | Smithsburg, MD US (lat 39.6333°, long -77.6000°, altitude 213 meters)
| 0.9mb | -0.7°F | -1.8°F
| CW4966 | 14.5 miles | Southwest | | Halltown, WV US (lat 39.3397°, long -77.7891°, altitude 146 meters)
| -0.7mb | 0.3°F | 18.8°F
| CW5204 | 14.5 miles | Southwest | | Harpers Ferry, WV US (lat 39.3392°, long -77.7891°, altitude 131 meters)
| -0.9mb | -0.1°F | -1.3°F
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The sites marked above thus did not report continuously during the analysis period, so the offsets may (probably will) not be accurate.
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 Guide (PDF): This is a guide to siting and operating a CWOP station. This is a must-read document.
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.
