Clouds

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Billowy Billows
White Fluffy Pillows
Puffy or Flat
Misty Zeppelins
Blanketing Overhead

Cumulus's Fluff 
Can Make For Wet Weather
Nebulous's Haze 
Makes Visibility Vexing
Stratus's Layers 
Lay Near to the Earth 
Veteran Sailors
Give Nimbostratus Wide Berth

Cumulonimbus's High Thunderheads
Pay Homage to a Norse God
Whose Lightning Bolts 
Evoke Approbation
And Remaining Outdoors
Requires Grave Consideration