halacha - Bracha on thunder and lightning - how often?

If you are in a rainstorm with thunder and lightning - you make the Brachos for them. What happens if the storm ends and then a few hours later (same day) it is raining again. Do you make another Bracha or is it only said once a day?

Answer

As long as it looks overcast, it's once per day.

If it totally completely absolutely clears up bright and shiny, then later thunderstorms, you'd make a new bracha.

SO:

Once per day,

OR

Once per cloudy episode

Whichever is more.

(See Shulchan Aruch Orach Chaim 227:2 and Mishna Berura sk 8)