Erroneous Wind Gusts and False Rain Reports?

Hi all. Quick question…this morning the Tempest has been acting a little weird. I have gotten a few rain reports but its mostly sunny with no rain. It is also reporting wind gusts into the mid-40’s mph. While it is a bit breezy here today, it is probably only gusting into the mid 20’s mph. Could both of these issues be caused by the dreaded pole vibration issue? The tempest has been up for a week and this is the first time this has happened. Thanks!

This may be a lengthy list. . .but check for ideas and images at: Rain sensor and vibrations

This may help give you some ideas of how to mitigate “wind-induced” vibrations / oscillations that produce bogus rainfall.

This location may help too:

P.S. I like your icon. . .I recognize both items. . .one inside the other. You’re located about 150 miles NE of my station in Bellevue, Nebr.

1 Like

because it uses ultrasonic waves to measure the wind speed instead of cups it might record higher wind gust. Cups need to get up to speed, ultrasonic measurement is instantaneous.

To follow up on sunny’s post above. . .look at your Tempest. There are 4 ultrasonic sensors under the top cap. These Should Be aligned exactly in a N-S and E-W configuration. When you look at the blue “north” marker on the back of the cap. . . there Should Be an ultrasonic sensor directly above it. That the North sensor. IF that sensor is slightly off (by just a fraction to as much as 30 degrees off either left or right. . . .that will also affect the direction. The north marker provides the correct orientation for the wind direction. . . but if the sensors and the cap are misaligned. . . that will affect the direction. I’ve seen several images where that is the case of Tempest caps that were not aligned properly.

Have you seen that with the production units rather than the field test units?

misalignment is never good, but the OP isn’t about wind direction, but about wind speed. Of course in never hurts to check the orientation of the sensors.

1 Like

Thanks for the replies everyone. Yeah, the wind direction is fine…the issue is the wind speed (specifically gusts) and the erroneous rainfall. I suspect the erroneous rainfall is due to pole vibration from the wind. I guess my real question is would pole vibration also cause exaggerated wind gusts as well?

I totally get that the wind sensors will be more accurate / instantaneous with gusts than cup sensors…but I can’t imagine it would almost double the wind gusts…would it? I have gusts into the mid 40’s mph while all the stations around me were consistently in the mid 20s. I also observed the conditions outside during these gusts and they were no where near the mid 40’s.

Thanks again everyone.

cups need time to get to the speed of the gust, and with a short gust, it might not get to the peak. Differences of 15km/h are possible.

Hi everyone. I have an update. I now believe my tempest may be defective.

Yesterday evening I completely replaced my mounting setup. I am now using a 36" long 1" galvanized pipe, filled with sand, and capped at both ends. It is attached to the peak of my roof at the soffit with new TV antenna brackets. I also used rubber tape where the pole meets the brackets to reduce vibration. It literally can’t get any more stable or secure.

Overnight and this morning it reported wind gusts in the 30’s mph, 40’s and even pushing 50. During this time, the actual winds have been calm to 9 mph. Oh and the tempest also recorded rain which is false.

I have submitted a support ticket. Honestly, between having to reset the Tempest already because it stopped reporting to the hub, occasional data loss, and the wind/rain issue…I am disappointed. If a weather station can’t accurately report two of the three main weather attributes (temp, rain, wind), then what’s the point?

If the field test had gone like you have experienced the Tempest would not have been released yet. There is definitely something amiss with your Tempest. WF support will take care of you.


Update. Pretty impressed with WeatherFlow customer service. I submitted a help ticket five days ago explaining the issue and I received a replacement Tempest today. Impressive! It already seems like the wind measurements are much more realistic!