Summary
As an "Average" person, you are vastly more likely to be hit by lightning over the course of a year (somewhere in the range 1 in 280,000 through 1 in 960,000) than you are to win the jackpot on the powerball lottery in a year (roughly 1 in 2.8 million if you play twice a week for 52 weeks).
Lightning
The National Oceanic and Atmospheric Administration produce a lightning safety pamphlet which states (Emphasis theirs)
The Odds Of An Individual Being A Lightning Casualty In A Year In The U.S. Is About 280,000-To-One -- If
You’re An Average Person, In An Average Location, With Average Outside Activities, And Average Lightning
Safety Behavior. That’s About 3,000-To-One Over Your Lifetime
However the National Weather service (Oddly enough, a part of the NOAA) lists this same (or similar) probability as:
Odds of being struck in a given year (estimated total deaths + injuries) 1/960,000
Protip: Mexicans should stay indoors during lightning storms!
Powerball Lottery
Wikipedia lists the current probability of a jackpot win on the powerball lottery with the current game listed as odds of
1:292,201,338
If we extend this out to a year's play (in order to bring into line with the NOAA's annual probability) at 2 plays per week for 52 weeks we get a figure of 1:2,809,628