There is some troubleshooting info at https://help.weatherflow.com/hc/en-us/articles/360050050673-Troubleshooting-Measurements-Data#h_01FRNCQV2FB9YQ8YHPCNAEZWNY . If this doesn’t help, is the lightning sensor in an OK status (or “Lightning Disturber” which may indicate that the Tempest is in “noisy” environment, but, the unit has recognized that and is compensating)? If the status shows a problem with the sensor, I would suggest contacting support. If you follow the instructions at Request to add your weather station share link in your profile , some folks here could try to ake a look and see if anything else is evident.
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