The William Tell Overture, composed by Gioachino Rossini in 1829, best known as the theme song for the Lone Ranger.
First and second movements:
The second movement should be instantly recognizable, and is pretty much always used to accompany wild thunderstorms.
Third and fourth movements:
Again, both movements are instantly recognizable, being used to accompany daybreak and Western action, respectively.
Also used for horse-riding scenes is Franz von Suppé's Leichte Kavallerie Overture, the operetta it precedes premiering in 1866.
And here are a couple bonus sunrises-
Morning Mood, part of Edvard Grieg's Peer Gynt, Op. 23, composed in 1875.
Spring Song, song no. 6 of Felix Mendelssohn's Songs Without Words, Book 5, Op. 62, composed c. 1843.