Specifically, “Endorsement, trademarks, and agency logos You cannot use government materials in a way that implies endorsement by a government agency, official, or employee. For example, using a photo in your advertisement of a government official wearing or using your product is not permitted. You also cannot use federal government trademarks or federal government agency logos without permission. For example, in general, you cannot use an agency logo or trademark on your social media page to suggest endorsement or sponsorship by the agency.”
NOAA does have a licensing program, but I somehow doubt that this app was part of that program. Assuming that’s true, then this is likely a case of poor enforcement.