newbie weather question

Hi:

In the Seasons chapter, there are certain weather “events” for the GM to decide to begin a Misssion with (Spring’s rains, flash floods or snows, for instance). Are these events for the PC with the Weather Watcher skill to attempt to change (if it needs to be done), using the Season’s “strength” rating (the Season’s number)? Or am I reading this wrong?

Thanks
G

Page 254. The player makes versus tests against the weather. If he wins, he may choose a weather option from the appropriate season. Droughts and flash floods are in the Wilderness section of the season and are not at the discretion of the weather watcher.