The Collaborative International Dictionary of English v.0.48:

Squall \Squall\ (skw[add]l), n. [Cf. Sw. sqval an impetuous
   running of water, sqvalregn a violent shower of rain, sqvala
   to stream, to gush.]
   A sudden and violent gust of wind often attended with rain or
   snow.
   [1913 Webster]

         The gray skirts of a lifting squall.     --Tennyson.
   [1913 Webster]

   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.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Squall \Squall\, v. i. [imp. & p. p. Squalled (skw[add]ld); 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.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Squall \Squall\, n.
   A loud scream; a harsh cry.
   [1913 Webster]

         There oft are heard the notes of infant woe,
         The short, thick sob, loud scream, and shriller squall.
                                                  --Pope.
   [1913 Webster]

WordNet (r) 3.0 (2006):

squall
    n 1: sudden violent winds; often accompanied by precipitation
    v 1: make high-pitched, whiney noises [syn: squall, 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, squall]
    3: blow in a squall; "When it squalls, a prudent sailor reefs
       his sails"