Not sure how to apply the weather cards. The example shows a card with a 4 which is applied to the active explorers in the zone nearest the pole. That means that only a single explorer gets exposure. However are the weather cards with 1, 2, 3 any different than clear weather cards since a roll of 1, 2 or 3 doesn't cause any exposure anyway? I'm not sure if I'm interpreting this correctly so please enlighten me.