Wrong Wind Speeds

Ive had mt T turned on for a week after being off for the winter and winds here were well over 15mph and the highest reading i got was 6mph. Tempest has no obstructions. Thinking a reset my be where to start. I forgot how to do it??
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With the Tempest sensor on, press and hold the LED button on the bottom for 10 seconds or more. The LED will begin to blink for initial pairing. In the mobile app go in and select Replace Device and select the Tempest. At this point the app might jump to one of the data screens or take you through the rest of the setup. It should be working again as if nothing changed.