Cumulus Support

jdc wrote:Just as an aside, are you confident that your anemometer is calibrated accurately enough to warrant worrying about +/-1 mph on a gust (which I believe is rounded, anyway).

Hmm, I think so. How do I find that out?

You might be right. It seems like it's being calibrated.

I've been looking all over the internet about how to calibrate the anemometer in case this is the problem. But, I can't find anything. I've looked through the Davis Vantage Vue Console manual. Nothing.

oh dear... I looks like your barometer is a couple of hPa out compared to your neighboring weather stations too.

hills wrote:oh dear... I looks like your barometer is a couple of hPa out compared to your neighboring weather stations too.

No, I'm on a hill.

Yes, my height was a bit high. I've corrected the pressure now.

You have fallen into a statistical trap.

Your equipment has an accuracy of +/- 2 MPH.

If indeed the gust was 32 MPH (and you do not really know that) then any recorded speed between 30 and 34 MPH is a valid record regardless of the software used.

I know I'll regret this but...

You said you recorded a gust of 32 mph (how you know this you do not specify), the console showed a peak of 31 mph, WL recorded 32 mph, Cumulus recorded 32 mph. Therefore the only problem I can see is the console did not display the 32 mph value at any point - a Davis problem and nothing to do with Cumulus.

mcrossley wrote:I know I'll regret this but...

You said you recorded a gust of 32 mph (how you know this you do not specify), the console showed a peak of 31 mph, WL recorded 32 mph, Cumulus recorded 32 mph. Therefore the only problem I can see is the console did not display the 32 mph value at any point - a Davis problem and nothing to do with Cumulus.

No, Cumulus recorded 31 mph in the wind gust and the Davis Vantage Vue Console recorded 32 mph in the wind gust. I saw this by watching the Davis Vantage Vue Console throughout the wind gust and never did I see 32 mph. So, Cumulus was correct if it was recording the 2.5 second updates. It's just confusing how the Davis Vantage Vue Console records a 1 mph higher wind gust, sometimes.

Jim Brown wrote:You have fallen into a statistical trap.

Your equipment has an accuracy of +/- 2 MPH.

If indeed the gust was 32 MPH (and you do not really know that) then any recorded speed between 30 and 34 MPH is a valid record regardless of the software used.

I understand.

William Grimsley wrote:No, Cumulus recorded 31 mph in the wind gust

But the log you attached showed it detected a 32 mph gust! It may not show for up to minute as that is how often Cumulus checks for a new peak gust value it has missed, but it did record it.

0851.298 : 08:20:01.616 Reading high gust value
0851.298 : 08:20:01.616 High gust value = 32
0851.298 : 08:20:01.616 Reading high gust time
0851.298 : 08:20:01.616 result=0
0851.298 : y=2014 m=1 d=26
0851.298 : 08:20:01.616 High gust time: 26/01/2014 08:17:00

William Grimsley wrote:and the Davis Vantage Vue Console recorded 32 mph in the wind gust.

Make your mind up!...

All I saw was 31 mph and that was looking throughout the wind gust at the Davis Vantage Vue Console and never did I see 32 mph which has happened many times

mcrossley wrote:

William Grimsley wrote:No, Cumulus recorded 31 mph in the wind gust

But the log you attached showed it detected a 32 mph gust! It may not show for up to minute as that is how often Cumulus checks for a new peak gust value it has missed, but it did record it.

0851.298 : 08:20:01.616 Reading high gust value
0851.298 : 08:20:01.616 High gust value = 32
0851.298 : 08:20:01.616 Reading high gust time
0851.298 : 08:20:01.616 result=0
0851.298 : y=2014 m=1 d=26
0851.298 : 08:20:01.616 High gust time: 26/01/2014 08:17:00

William Grimsley wrote:and the Davis Vantage Vue Console recorded 32 mph in the wind gust.

Make your mind up!...

All I saw was 31 mph and that was looking throughout the wind gust at the Davis Vantage Vue Console and never did I see 32 mph which has happened many times

Very strange. All I saw on the wind gauge was 31 mph. Bizarre.

Interestingly, Cumulus is now reading the wind gusts either 1 mph higher or the same as the Davis Vantage Vue Console. But, after looking at the Davis Vantage Vue Console 10 minute wind gusts carefully, they change a lot.

William Grimsley wrote:Very strange. All I saw on the wind gauge was 31 mph. Bizarre.

That may well be the case, but Cumulus 'catches up' with any gusts it has missed every minute, so they will show on the various records - Today's maximum wind gust etc.