Luke Howard and Cloud Names

howard image
Cumulus Clouds by Luke Howard

In December 1802, a pharmacist called Luke Howard presented his paper, "On the modification of clouds" ('modification' meaning 'classification'), and in it proposed some of the cloud names we still use today.

Howard introduced three basic cloud types:

Cirrus

(Latin for a curl of hair), which he described as "parallel, flexuous, or diverging fibres, extensible in any or all directions" cirrus

Cumulus

(meaning heap), which he described as "convex or conical heaps, increasing upward from a horizontal base" cumulus

Stratus

(meaning something spread), which he described as "a widely extended, continuous, horizontal sheet, increasing from below". stratus

He combined these names to form four more cloud types:
Cirro-cumulus, which he described as "small, well-defined roundish masses, in close horizontal arrangement";

  cirro cumulus

Cirro-stratus, which he described as "horizontal or slightly inclined masses, attenuated towards a part or the whole of their circumference, bent downward, or undulated, separate, or in groups consisting of small clouds having these characters"; cirro stratus

Cumulostratus, which he described as "the cirrostratus blended with the cumulus, and either appearing intermixed with the heaps of the latter, or super-adding a widespread structure to its base" cumulo stratus

Cumulo-cirro-stratus or Nimbus, which he called the rain cloud, "a cloud or system of clouds from which rain is falling". He described it as "a horizontal sheet, above which the cirrus spreads, while the cumulus enters it laterally and from beneath". cumulonimbus

 

Luke Howard's Biography

luke howardLuke Howard was born in London on 28 November 1772, the first child of successful businessman Robert Howard and his wife Elizabeth. He was educated at a Quaker school at Burford in Oxfordshire and was then apprenticed to a retail chemist in Stockport.

He became, like his father, a businessman, developing a firm that manufactured pharmaceutical chemicals. His real interest was, though, in meteorology, and he made a number of significant contributions to the subject besides his cloud classification.

He published The Climate of London (first edition 1818, second edition 1830), Seven lectures on meteorology (1837), A cycle of eighteen years in the seasons of Britain (1842) and Barometrographia (1847).

luke howards cloud images
a sketch by Luke Howard

He was elected a Fellow of the Royal Society on 8 March 1821 and joined the British (now Royal) Meteorological Society on 7 May 1850, only a month after the society was founded. He died in London on 21 March 1864.

anvil

Howard's sketch of cumulus with anvil