As you are asking for a station individual issue, it is always a good idea to mention the related station ID either in the post or in your profile (see request-to-add-your-weather-station-share-link-in-your-profile.
Anyway, here are some points you might check:
Is the Bluetooth turned on on your iPad ?
Restart the WF app.
Resart the iPad and then restart the WF app.
Does one of these help to solve the issue ?