Visibilities of 100 to 200 miles over large areas are reported by pilots flying in the Arctic winter of interior Alaska. However, when the airport is reached, they find ice fog and visibility near zero. This condition is described and reasons are presented for ice fog formation and persistence in the vicinity of towns while other areas equally cold remain fog free.
Bowen's cosmic cloud-seeding hypothesis of rainfall singularities is examined using rainfall data from the African tropics. These data are presented for January and evaluated for the entire year. Some of the physical uncertainties remaining to be investigated are discussed.
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