Basic Data Structures: Copy Array Items Using slice()

Guys I have a question.

Following the array index, to find, add or remove an element it should be like this isn’t?
image

in this code, it is behaving differently which is tricking my mind.

let weatherConditions = ['rain', 'snow', 'sleet', 'hail', 'clear'];

//>>>>WHY (1,3) IS RETURNING ['snow', 'sleet']; AND NOT ['rain', 'sleet', ]<<<< ????

let todaysWeather = weatherConditions.slice(1, 3);
// todaysWeather equals ['snow', 'sleet'];
// weatherConditions still equals ['rain', 'snow', 'sleet', 'hail', 'clear']

thank you.