To unsubscribe your mobile device from National Weather Service notifications sent from nws.noaa@service.govdelivery.com:

Step 1 - log into https://service.govdelivery.com/service/user.html?code=USNWS with your phone number

Step 2 - Follow the link "subscriber preferences" to completely delete your account. You can also change your subscriptions by either unchecking (to stop receiving specific notifications) or checking (to add new subscriptions) the selection boxes.

Step 3 - The "Subscriber Prefernces" page lists all Topics you have subscribed to, as well as a link to delete you account completely. You can unsubscribe from specific topics by unchecking the box to the right of the topic name. After changing subscriptions, click the submit button. To compeltely remove your account, click on the clink "Delete my account" and conform that you want to completely remove you account and end all subscriptions.

Step 4 - Confirmation page - this page confirms that you have successfully deleted your account and all subscriptions will be canceled.