Source : Webster's Revised Unabridged Dictionary (1913)

Squall \Squall\, n. [Cf. Sw. sqval an impetuous running of
   water, sqvalregn a violent shower of rain, sqala to stream,
   to gush.]
   A sudden violent gust of wind often attended with rain or
   snow.

         The gray skirts of a lifting squall.     --Tennyson.

   {Black squall}, a squall attended with dark, heavy clouds.

   {Thick squall}, a black squall accompanied by rain, hail,
      sleet, or snow. --Totten.

   {White squall}, a squall which comes unexpectedly, without
      being marked in its approach by the clouds. --Totten.

Squall \Squall\, v. i. [imp. & p. p. {Squalled}; p. pr. & vb. n.
   {Squalling}.] [Icel. skvala. Cf. {Squeal}.]
   To cry out; to scream or cry violently, as a woman
   frightened, or a child in anger or distress; as, the infant
   squalled.

Squall \Squall\, n.
   A loud scream; a harsh cry.

         There oft are heard the notes of infant woe, - The
         short, thick sob, loud scream, and shriller squall.
                                                  --Pope.

Source : WordNet®

squall
     n : sudden violent winds; often accompanied by precipitation
     v 1: make high-pitched, whiney noises [syn: {waul}, {wawl}]
     2: utter a sudden loud cry; "she cried with pain when the
        doctor inserted the needle"; "I yelled to her from the
        window but she couldn't hear me" [syn: {shout}, {shout out},
         {cry}, {call}, {yell}, {scream}, {holler}, {hollo}]
     3: blow in a squall; "When it squalls, a prudent sailor reefs
        his sails"