Beginning in May 2018, users were required to create StormWatch+ accounts within their app after purchasing the alerting capability. If you have forgotten your password for this new account, you may reset your StormWatch+ account password at the following link:
On the Password Reset page, enter the email address that you used to create your StormWatch+ account and click "Send password reset link." Within a couple of minutes, you will have an email with instruction on resetting your password, which you may then use to login to your StormWatch+ account in the app.
NOTE: Password reset only applies to your StormWatch+ account created within the StormWatch+ app, NOT restoral of the in-app upgrade in your app or downloading of the app itself. Those credentials are managed by Apple and/or Google.