Each time the wind reaches a higher value than previously reached since midnight, both the gauge-hand and the 10-minute-gust-indicator move simultaneously to the new high, but the daily-high-wind-gust-pointer does not. It remains at the previous daily-high until expiration of the current weewx 300-second archive interval when it then also moves to the new high.
I will be traveling the next 24-hours and not able to respond quickly. -Bob On Tuesday, March 7, 2017 at 4:04:37 PM UTC-8, gjr80 wrote: > > I would say that this will quite often be the case. > > The daily high wind gust pointer should always indicate the highest wind > speed seen after midnight at the start of the day and up to and including > midnight at the end of the day. In other words it will reflect the highest > wind speed indicated by the gauge hand throughout the day. At midnight the > daily high wind gust pointer is reset to 0 and it will again start tracking > the highest wind speed seen throughout the new day. On the other hand, the > 10 minute gust value is the highest wind speed seen over the last 10 > minutes, it is not constrained by day boundaries. So consider the first > packet that arrives after midnight, say at 2 seconds after midnight. > Assuming its windSpeed value is >0, the daily high wind gust pointer will > move the this new value. Now if the 10 minute wind gust value is currently > higher than this latest windSpeed (in other words the 10 minute wind gust > occurred some time in the last 10 minutes of the previous day), the daily > high wind gust pointer will not be affected by the 10 minute wind gust and > nor should it (because it occurred yesterday). If the 2 seconds after > midnight windSpeed value is higher than the 10 minute wind gust value, then > the 10 minute wind gust value will be updated to this new windSpeed value > and the daily high wind gust pointer will indicate the same value (as will > the wind speed gauge hand). > > The real check for correct operation of the daily high wind gust pointer > just after midnight is to verify that it tracks the highest speed indicated > by the gauge hand after midnight. If the gauge hand indicates say 5mph and > the daily high wind gust pointer indicates 4 mph then we have a problem. > > Gary > > On Wednesday, 8 March 2017 02:40:39 UTC+10, tempus wrote: >> >> The only issue I have noticed since upgrading to v0.2.9 is that for a >> short time period following midnight the daily high wind gust pointer was >> below the 10-minute high gust indication. However, I went to bed after >> that and haven't watched since. Based on that single observation it >> appears that periodic daily high wind speed values from the weather station >> aren't being updated to include latest wind speeds. >> >> -Bob >> >> On Tuesday, March 7, 2017 at 4:20:34 AM UTC-8, gjr80 wrote: >>> >>> Well I observed your wind speed gauge over a couple of continuous 10+ >>> minute periods this afternoon, there were 5 occasions where the gauge >>> indicated a speed higher than the present 10 minute gust and in each case >>> the 10 minute gust immediately jumped up to the indicated speed. I guess >>> this supports your observations under v0.2.9. I noticed a number of changes >>> (daily max, gauges rescaling, windrun going to 0) at 6PM my time and >>> thought what? Then I realised it was midnight and change of day (I am +10 >>> UTC). So the chnage of day appears to works fine. >>> >>> Periods of lower wind speeds are more likely to include some 0 wind >>> speed packets than periods of higher wind speed. It's possible the old >>> method of calculating the 10 minute gust could have been upset by 0, I >>> don't believe that was the case but who knows. >>> >>> Staring at a gauge for 10+ minutes is incredibly boring so I will leave >>> that for now, let me know if you notice anything else that does not appear >>> right. >>> >>> Gary >>> >>> On Tuesday, 7 March 2017 17:24:58 UTC+10, tempus wrote: >>>> >>>> Sorry about the 403 Forbidden error. That is a test domain and public >>>> access is often blocked. I opened access a few hours ago when I saw your >>>> message, but didn't have time right then to post a response or upgrade. I >>>> have since upgraded to v0.2.9. You should now be able to see it working >>>> here: >>>> >>>> http://www.lablibrary.com/ss/newport.php >>>> >>>> This area recently had a several-day period of unusually light winds. >>>> The 'wgust" value anomalies occurred at those unusually low wind speeds. I >>>> don't know why functionality would be different at different speeds, but >>>> whatever the reason, v0.2.8 'wgust' anomalies occurred far less frequently >>>> today at higher speeds and I haven't seen them at all since upgrading to >>>> v0.2.9. >>>> >>>> Weather forecasts are not very reliable in this area, but there may be >>>> an opportunity to check higher-speed functionality tomorrow, because the >>>> National Weather Service has issued this High Wind Watch: >>>> >>>> "*South wind 30-40 mph with gusts to 65 mph, strongest near beaches >>>> and headlands but also possibly affecting coastal communities. Winds >>>> spreading northward late Tuesday morning, with peak winds from about noon >>>> to 4:00pm or 5:00pm. These winds could cause tree damage that could lead >>>> to >>>> power outages, and will cause hazardous driving conditions.*" >>>> >>>> My anemometer is 33-feet (*10 meters*) above ground, 204 feet (*62 >>>> meters*) above mean-sea-level, and line-of-sight to the sea, so it >>>> should be spinning rather quickly if the forecast is correct. The time >>>> here >>>> is 8 hours behind UTC. >>>> >>>> -Bob >>>> >>>> On Monday, March 6, 2017 at 2:26:22 PM UTC-8, gjr80 wrote: >>>>> >>>>> >>>>> On Sunday, 5 March 2017 06:11:53 UTC+10, tempus wrote: >>>>>> >>>>>> I have been traveling for a few days with only a SmartPhone to watch >>>>>> data. However, based merely on wind-speed-gauge indications there seem >>>>>> to >>>>>> be "wgust" value anomalies. The pink gust-area sometimes disappears even >>>>>> though there have been recent gusts into that speed-range. Furthermore, >>>>>> gusts above the indicated upper-gust-limit often do not cause the >>>>>> indicated >>>>>> gust-range to expand. >>>>>> >>>>> >>>>> I have been closely observing my wind speed gauge over the last few >>>>> days during various windy periods. I did notice periods where the red >>>>> gust >>>>> 'wedge' would disappear for a short period. I observed several occasions >>>>> where the indicated wind speed went higher than the existing 10 minute >>>>> gust >>>>> value, on all occasions the ten minute gust value was immediately >>>>> increased >>>>> and the red gust wedge similarly increased in size immediately to match >>>>> the >>>>> indicated wind speed. >>>>> >>>>> >>>>>> It is my understanding that the value of "wgust" is supposed to be >>>>>> the speed of the highest gust over the last ten-minutes. If so, the >>>>>> ten-minute time-window should include recent "wlatest" values. >>>>>> >>>>> >>>>> That is my understanding as well and that is exactly what rtgd does. >>>>> The issue in this case was the method in which the ten minute wind gust >>>>> value was derived from the ten minute wind speed list. This has been >>>>> fixed >>>>> in v0.2.9. >>>>> >>>>> I have no solution for the gusts you observed that did not update the >>>>> ten minute gust value. I have not been able to replicate this issue and I >>>>> have reviewed the code and am confident it is correctly capturing >>>>> windSpeed >>>>> data and calculating 10 minute gust values. I suggest you upgrade to >>>>> v0.2.9 >>>>> and see if the issue remains, if so we need to determine the conditions >>>>> under which the issue occurs. If this is not possible visually then I >>>>> have >>>>> some wind speed debug code that will dump the windSpeed history list and >>>>> other key values to log and we will need to wade through the figures to >>>>> determine the issue. >>>>> >>>>> I did go to your previously posted link to try to observe the issues >>>>> you describe myself but the link now gives me a 403 Forbidden error. >>>>> >>>>> Gary >>>>> >>>> -- You received this message because you are subscribed to the Google Groups "weewx-user" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
