1  Cumulonimbus (Nyudo-gumo) or Swelling Cumulus |  2  Swelling Cumulus

Cumulus?  1  Flat bottom clouds |  2  Flat bottom clouds (Up-Close)

Cumulus clouds (above left: わた雲) and a contrail (below left: 飛行機雲)

Contrail at Sunset:  1a / 1b  (Up-Close) Contrail at Sunset    日没時の飛行機雲

16106 191221  Mammatus Clouds over Nebraska  "Astronomy Photo of the Day" by NASA  Dec. 15, 2019 
Astronomy  |  Clouds
6841 140804  Veins of Heaven - noctilucent clouds, Gotland, Sweden  "Astronomy Photo of the Day" by NASA July 31, 2014  P-M Hedén (Clear Skies, TWAN)
10 Rare Cloud Formations - Listverse  Adam Winkles, 10/10/2007

10890 160220  A Heart Shaped Lenticular Cloud    "Astronomy Photo of the Day" by NASA  February 14, 2016
Valentine's Day  |  Clouds

7628 141104  Photos: Cloud phenomenon in Aussie skies -  AP, 11/04/2014, Wonthaggi, Australia

2719 130724  Photo Incredible Cloud Formation Over Michigan - SKYE on AOL

5743 140422  Mammatus Clouds over Nebraska  "Astronomy Photo of the Day" by NASA April 15, 2014

Information Sources:
James Kavanagh and Raymond Leung: Weather - An Introduction to Clouds, Storms and Weather Patterns (Waterford Press, 2001)
Clouds Types

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