Arago: Cloudscapes Issue

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Cloudscapes Issue

The Postal Service issued a souvenir sheet of 37-cent, Cloudscapes commemorative stamps in fifteen designs. This pressure-sensitive adhesive souvenir sheet of fifteen was issued on October 4, 2004, in Milton, Massachusetts. Avery Dennison printed 125,040,000 stamps in the gravure process. Howard E. Paine of Delaplane, Virginia, designed the stamps.

Clouds develop when moist air cools to its dew point by rising to a higher altitude or by moving over a cooler surface. Water vapor in the air then condenses in liquid or frozen form around minute particles such as pollen or dust. The shapes and altitudes of clouds, as well as the sequences in which they develop, help forecast the weather.

In the early nineteenth century, Englishman Luke Howard, a chemist by trade and meteorologist by avocation, created a system for classifying clouds using Latin names. He described the three most common shapes as cirrus (curl of hair), stratus (layer), and cumulus (heap); he also defined four compound cloud forms that derive from the three primary shapes. Later, scientists added terms such as humilis (small) and incus (anvil) to designate other cloud properties. Arranged according to altitude, nine of the ten basic cloud genera are pictured on this stamp pane. Information about each cloud image is included on the back of each stamp.

Reference:

Postal Bulletin (September 2, 2004).


Additional Records
  • Overview
  • 37c Altocumulus Castellanus single
  • 37c Cloudscapes pane of fifteen
  • 37c Cirrus Radiatus single
  • 37c Cirrostratus Fibratus single
  • 37c Cirrocumulus Undulatus single
  • 37c Cumulonimbus Mammatus single
  • 37c Cumulonimbus Incus single
  • 37c Altocumulus Stratiformis single
  • 37c Altostratus Translucidus single
  • 37c Altocumulus Undulatus single
  • 37c Altocumulus Lenticularis single
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