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HTML 

              
                

<svg id="cloud01" class="clouds" xmlns="http://www.w3.org/2000/svg" viewbox="0 0 651 339" width="651" height="339">
  <g id="layer1" fill="#fff">
    <path id="path2991" stroke="#000" stroke-width="3.961" d="M312.993 82.697c494.563 31.262 369.317 340.225 90.044 177.12"/>
    <path id="path2993" stroke="#000" stroke-width="3.961" d="M291.1 241.27c8.543 128.342 193.713 67.49 164.415-15.073"/>
    <path id="path2995" stroke="#000" stroke-width="3.961" d="M326.997 124.063c-542.074-70.883-274.534 259.2-130.78 164.048"/>
    <path id="path2989" stroke="#000" stroke-width="3.961" d="M206.65 121.053c108.772-190.37 428.19-23.92 290.165 67.66"/>
    <path id="path2993-1" stroke="#000" stroke-width="3.961" d="M162.802 253.18c5.08 137.576 187.57 83.87 164.415-15.073"/>
    <path id="path2993-7" stroke="#000" stroke-width="3.961" d="M277.305 106.79C222.15-65.603-7.1 76.024 100.54 152.12"/>
    <path id="path2993-7-4" stroke="#000" stroke-width="3.961" d="M454.895 103.894c36.867-123.23-157.893-130.958-159.31-43.36"/>
    <path id="path3878" d="M200.258 123.23l214.91 3.664-1.22 107.456-275.966 31.748z"/>
  </g>
</svg>
<svg id="cloud02" class="clouds" xmlns="http://www.w3.org/2000/svg" viewbox="0 0 494 189" width="494" height="189">
  <g id="layer1" fill="#fff">
    <path id="path2991" stroke="#000" stroke-width="2.684" d="M353.322 86.835c230.176-17.896 135.722 115.67-5.31 55.623"/>
    <path id="path2993" stroke="#000" stroke-width="2.684" d="M240.335 134.195c7.062 71.253 160.14 37.47 135.92-8.368"/>
    <path id="path2995" stroke="#000" stroke-width="2.684" d="M270.01 69.125c-448.125-39.353-226.954 143.9-108.114 91.075"/>
    <path id="path2989" stroke="#000" stroke-width="2.684" d="M123.077 69.488c81.844-88.742 401.423-15.314 287.32 35.53"/>
    <path id="path2993-1" stroke="#000" stroke-width="2.684" d="M134.272 140.807c4.2 76.38 155.063 46.563 135.92-8.368"/>
    <path id="path2993-7-4" stroke="#000" stroke-width="2.684" d="M375.74 57.927c30.48-68.414-130.526-72.704-131.697-24.073"/>
    <path id="path3909" d="M136.407 93.305S321.51 47.338 325.547 49.37c4.038 2.035 77.728 73.216 77.728 73.216l-302.963 26.178z"/>
  </g>
</svg>

<svg id="cloud03" class="clouds" xmlns="http://www.w3.org/2000/svg" viewbox="0 0 335 185" width="335" height="185">
  <g id="layer1" fill="#fff">
    <g id="layer1-1" stroke="#000" stroke-width="3">
      <path id="path2991" d="M208.94 59.26c206.214-24.96 121.593 161.344-4.755 77.588"/>
      <path id="path2993" d="M107.716 125.322c6.327 99.387 143.47 52.265 121.77-11.672"/>
      <path id="path2995" d="M134.302 34.558c-229.643-4.775-113.794 179.92-7.326 106.234"/>
      <path id="path2989" d="M94.006 57.76c73.324-123.783 222.17-10.014 166.068 26.863"/>
    </g>
    <path id="path3947" d="M68.56 55.44l186.825-2.442v63.496L73.443 148.242z"/>
  </g>
</svg>

<svg id="cloud04" class="clouds" xmlns="http://www.w3.org/2000/svg" viewbox="0 0 335 185" width="335" height="185">
  <g id="layer1" fill="#fff">
    <g id="layer1-1" stroke="#000" stroke-width="3">
      <path id="path2991" d="M208.94 59.26c206.214-24.96 121.593 161.344-4.755 77.588"/>
      <path id="path2993" d="M107.716 125.322c6.327 99.387 143.47 52.265 121.77-11.672"/>
      <path id="path2995" d="M134.302 34.558c-229.643-4.775-113.794 179.92-7.326 106.234"/>
      <path id="path2989" d="M94.006 57.76c73.324-123.783 222.17-10.014 166.068 26.863"/>
    </g>
    <path id="path3947" d="M68.56 55.44l186.825-2.442v63.496L73.443 148.242z"/>
  </g>
</svg>
!

CSS 

              
                body{
  background: blue;
  overflow:hidden;
}

.clouds{
  position:absolute;
}
#cloud01 {
  width: 300px;
  height: auto;
  top: 5px;
  left: -300px;
}
#cloud02 {
  width: 200px;
  height: auto;
  top: 90px;
  left: -200px;
}
#cloud03 {
  width: 80px;
  height: auto;
  top: 15px;
  left: -80px;
}
#cloud04 {
  width: 120px;
  height: auto;
  top: 150px;
  left: -120px;
}
!

JS 

              
                
// play with TIME und RUN-positions

var ww = $(window).width() + 300;

  var cloudTl = new TimelineMax({repeat:-1, force3D:true});
  cloudTl.to("#cloud01", 22, {x:ww ,ease: Linear.easeNone}, 1)
    .to("#cloud02", 19, {x:ww ,ease: Linear.easeNone}, 0.9)
    .to("#cloud03", 18, {x:ww ,ease: Linear.easeNone}, 1)
    .to("#cloud04", 21, {x:ww ,ease: Linear.easeNone}, 1.5);

//next step could be to put some RANDOM for TIME and ... to the sky (a function onRepeat or onUpdate)
!
999px

Console