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FAA Glossaries

Touring Machine Company

Unusual weather terms.

fractus /ˈfræktəs/

pogonip /ˈpɒgənɪp/
An ice fog that forms in the mountain valleys of the western U.S.

“The people here are like your mothers and your grandmothers – would you want them sleeping out in Pogonip on a cold night like tonight?” Martinez asked. [Link]

A violent sandstorm or dust storm in the deserts of Arabia, North Africa, India, or North America.

Haboob Wind Storm Blankets Phoenix Area With Choking Red Dust

petrichor /ˈpɛtɹɪkɚ/
The distinctive scent which accompanies the first rain after a long warm dry spell.
The yellow organic oil that yields this scent.

The smell itself comes about when increased humidity – a pre-cursor to rain – fills the pores of stones (rocks, soil, etc) with tiny amounts of water.

While it’s only a minuscule amount, it is enough to flush the oil from the stone and release petrichor into the air. This is further accelerated when actual rain arrives and makes contact with the earth, spreading the scent into the wind.

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