On April 4 after 11:30 pm Tempest’s relative humidity sensor failed and started showing steadily 7%. After reporting this to WeatherFlow support, defect was verified and a replacement unit is on the way. Until the new unit arrives, relative humidity is measured using Ruuvitag.
Also solar power measurement is likely faulty showing too high values. Station Master does not have an alternative solar power sensor, so we just need to wait for the replacement unit.