STEP 1
first open a new doc 500px x 150px.
then filter/render/clouds.
then filter/render/difference clouds.
then press ctrl-f 20-50 times.
then press ctrl-m and mess with the curves until you get something you like.
then go to image/adjust/hue-saturation and play with it until you get a nice colour
i used hue 173/saturation 20
STEP 2
press ctrl-shft-n to make a new layer
then filter/render/clouds
then filter/render/difference clouds
then press ctrl-i to invert it
then ctrl-l to go to the levels modifier
now change the middle box(where it says 1.00) to .1
Repeat this step for as many flashes as you want to have (i done 2)
STEP 3
select the Background layer and duplicate it(ctrl-j)
then press ctrl-l and this time change the middle box to 1.5
now make the 2 lightning layers invisible by clicking the eye next to them in the layers list
Now were ready for the animation
transfer the document to imageready
STEP 4
make sure you can see the animation window.if you cant, go to window/animation
then duplicate the frame
now with the second frame still selected click on tween and tween with the previous
frame and add about 5 frames
now select the last frame in your sequence and duplicate it
now choose frame 6 and hide the background layer also make one of your lightning layers visible
set its blending mode to "linear dodge"
repeat that for frame 8 but make the other lightning layer visible
now choose the last frame and tween it with the first(add 5 frames again)
*(OPTIONAL RAIN)*
if you do not want rain skip to STEP 5
if you want to make your thunderstorm look TOP CLASS try adding some rain to the picture
transfer your document back to photoshop
STEP 1
Create a new layer(ctrl-shft-n)
Then filter/render/clouds
then filter/noise and use these settings
AMOUNT:400
DISTRIBUTION:gaussian
MONOCHROMATIC:yes
Then go to filter/blur/motion blur and use these settings
ANGLE:45
DISTANCE:14
then set the blending mode to screen
then press ctrl-l and change the first box to 135
Repeat this step 3 more times
NOW BACK TO IMAGEREADY
STEP 2
now in each frame on your slide make one of the rain layers visible but make sure you make a
different rain layer visible on each frame
Now you have created a thunderstorm
STEP 5
go Back to photoshop
make a new layer(ctrl-n)
and use your rectangular marquee tool and drag a box around your sig
then go to edit/stroke and make a 1-5px stroke its up to you
then go to blending options for this layer(you can do this by double clicking the layer in the layer
list
then tick
DROP SHADOW
BEVEL & EMBOSS and set the size to 2px
Now you have your border
STEP 6
(Optional)
if you like you can add a render or text(or even both)
here is what i finished with
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