Ground Zero, the online App developed by Carlos Labs gives you an idea of A-bomb like the Little Boy dropped by United States on Hiroshima on 6 August 1945 to end the second world war, will impact your area. Ground Zero has various preset bombs which you can explore from 7 Kilotons to 400 Kilotons. The website also has an option for an Asteroid strike for you to check out.
If you dont like Ground Zero, you could go to NUKEMAP or ApocaLuck, two sites that also simulate damages from nuclear weapons, but have many more features. But if you like a clean UI and only want to study the impact, head over to Ground Zero now.