Yes, the app allows you to set sounds for alerts, but they are off by default.
To add alert sounds, go into the app settings and tap the “Notifications” item.
Scroll to the bottom of the screen and select “Customize notifications.”
You will find a section for each alert type, Warnings, Watches, and Advisories. To add sounds, tap the “Sound” icon and you will be presented with a list of sound options. Make a selection and tap “OK.”
There are also checkboxes to activate vibration and LED Flash for each type.
To modify for which locations you receive alerts, return to the app home screen and select Edit Locations from the menu. Tap the location you want to modify and you can check/uncheck the boxes for the notifications you wish to receive for that location.