Meteorological organization warning to mountain climbers According to the announcement of this organization on Thursday and Friday, the activity of the rain system will be extensive in the western half of the country, the northwest, the Alborz and Zagros mountains with showers and thunderstorms, hail and fog pollution (reducing horizontal and vertical visibility) and at the heights of the snows and snows, the banks of the snows and snows. Floods, flash floods and rock slides downstream.