Wind Gust Multiplier and Gust Period Issue

[hemmits]

I think I may have discovered a small bug. I use the default period of 10 minutes for the wind gust. However, when I use a multiplier for the wind gust, the period for the wind gust becomes erratic. I have seen Cumulus hold the wind gust for more than 10 minutes on several instances, with 20 minutes being most common. I even tried forcing a 10 minute gust in the cumulus.ini file by setting PeakGustMinutes=10, but this did not help. Has anyone seen this issue?

[mcrossley]

Looking at the code I cannot see it can make any difference.

Cumulus stores all the uncalibrated gust values, finds the highest within whatever "gust period" you have defined, then uses that value multiplied by your Gust Multiplier.

So if you use a calibration or not, the same raw value is used, the only difference being it is multiped by 1 for no calibration, or your value if you have changed it from 1.

Of course having the same 10 min gust value last for 20 mins or 20 hours can be valid, every time the wind reaches that value and no more within the 10 minute period, the timer starts again.

[hemmits]

Thanks for the response and for looking into this Mark. I am stumped as to why this issue continues to occur. Some of the longer periods with the same gust value can certainly be attributed to the simple fact that the gust value was hit twice or more in the that period, resetting the timer. However, the frequency I am seeing this is beyond coincidence. In addition, most instances where this is occurring, the wind speed in the same period is in a downtrend and does not make sense with an additional gust of that value. For instance, yesterday I had a wind speed/gust of 19G34. Ten minutes later (at the reset point) the wind speed was 12 mph and still trending down but the gust of 34 held for another ten minutes. Something is going on and I can't seem to make sense of it. I assumed it may have been the calibration factor added to the wind gust, but with you not seeing an explanation for this in the code, I'm back to square one. Is there any other setting that could cause this issue?

[hemmits]

I opened up WeatherLink to examine the raw wind data there. I found that where this "longer gust" period is occurring there was a double report of the same peak wind speed in the raw data over a ten minute period. My logging interval is 5 min. That would probably explain what I'm seeing in Cumulus. I am wondering if there is an issue with the Davis console firmware? I now believe this to be an issue with the console or logger and not Cumulus. I have changed my logging interval to one minute to see if that affects anything.

[hemmits]

I think I may have discovered a small bug. I use the default period of 10 minutes for the wind gust. However, when I use a multiplier for the wind gust, the period for the wind gust becomes erratic. I have seen Cumulus hold the wind gust for more than 10 minutes on several instances, with 20 minutes being most common. I even tried forcing a 10 minute gust in the cumulus.ini file by setting PeakGustMinutes=10, but this did not help. Has anyone seen this issue?

It seems that the gust period is not holding to 10 minutes again for my Davis Pro 2 with WLL. I've seen this issue crop up a couple versions ago with the gust holding to 20 minutes most times. Any idea what software change may have caused this?

[freddie]

Have you ruled out the fact that you may have recorded the same gist again in the subsequent 10 minute period?

[mcrossley]

Is your WLL uploading to weatherlink.com OK when the gust "holds"?
Looking back is no good, because the WLL will upload the real-time data when the connection resumes. You must look at the time it occurs.

Just a vague idea of a possible problem!

[hemmits]

Is your WLL uploading to weatherlink.com OK when the gust "holds"?
Looking back is no good, because the WLL will upload the real-time data when the connection resumes. You must look at the time it occurs.

Just a vague idea of a possible problem!

As far as I know it is. I will continue to monitor and see if I notice any patterns. Thanks!