Recent Posts

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I recently received a new SHT31 sensor assembly. I installed it in my AC FARS on October 7th.

After performing almost 2 dozen tests with a 3 month old, factory certified Kestrel 5000 (+/- 2%) and cross referencing with the nearby airport and another SHT31 I own with a consistent bias (of about +8%), I can confidently state that the sensor arrived with an average 6% wet bias. It's consistent from all the way up to 80% at which point it's about half that (+3%) until you reach accuracy around 90-93%.  The lowest humidity I've tested is 51%, but I have no reason to believe the error won't extend down another 20% or so into the 30 percentiles (that's the behavior of my other SHT31 sensors).

The new sensor has been maxing out at 98% but only after hours of exposure to saturated air. Effectively, 97% has been the ceiling since it was installed. I expect that maximum value to slowly decline over the next several months to around 95-96%, as has been the case with my 2 other 31s so far (along with reports of the same from many other owners and surveys of nearby VP2s).
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Weather Web Resources / Re: Who all uses your data?
« Last post by bchwdlks on Today at 01:44:16 PM »

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Has any one else ran across something like this for your data?  Is there a way to know who all is using the data we're uploading?  It seems like we should be getting a little something for our efforts.


I have not watched for my CWOP data, but about a year ago the number of views on my WU page jumped from 5-10 per day to 100+ per day. I never did find out who was hitting it, but the local ABC affiliate has a "Skywatch Weather Camera" network that uses a time lapse from my weather camera several times a week.
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WeatherLink by Davis Instruments / Re: Weatherlink.com 2.0 announced
« Last post by johnd on Today at 01:07:47 PM »
Just a heads-up that the manual migration tool in 2.0 has now been disabled. Not quite sure why, but seems to be connected with a final push of automatic migration for remaining 1.0 users, which should happen in the coming few weeks. Right now the count of station on the 1.0 map is down to 12,000 so it looks like 50-60% of users have already migrated or been migrated.
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Davis Instruments Weather Stations / Re: Anemometer & Vane Tester
« Last post by WXH on Today at 01:03:58 PM »
Hi Al, thanks for the update.
I like to hear when everything is working and passed the tests, and also the possibilities for ordering a tester.

grtz Remie
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CWOP Forum / Re: Bad analysis data / WXQC Mailing List?
« Last post by RickNY on Today at 12:43:28 PM »
If you notice on my first pic, the graph does adjust scale when the analysis data is off.
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CWOP Forum / Re: Bad analysis data / WXQC Mailing List?
« Last post by kokketiel on Today at 12:37:14 PM »
I did notice that on the days this occurs, there usually ends up being big gaps in the “Analysis” data as well.

I don't think the gap is in the data - it's the dewpoint that is way off the scale...
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WeatherUnderground / Status Message Gone
« Last post by CBXSteve on Today at 11:50:21 AM »
Status message disappeared. Yet another reason for users to stop querying my station, not that there are many left.
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Ambient Weather Station / Re: WS-2000 not uploading to ambientweather.net
« Last post by KK7X on Today at 09:56:02 AM »
Thank you for the responses.  It is working now.
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I hope that you will advise us of what failed.  Here is another more in-depth method of testing the anemometer while it is still mounted atop the mast.  You'll need an Ohmmeter and a 6 pin telephone jack.  Use the attached chart to compare your meter readings.
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Weather Conditions Discussion / Re: Fall/Winter '18/'19
« Last post by Jasiu on Today at 09:05:57 AM »
Looks like our first freeze will be Thursday night / Friday morning. Going to get close tonight but forecast to hover just above the freezing mark. The only thing keeping NWS from issuing a frost advisory is that the winds will be howling as the cold front moves through.
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