Distance the snow and ice covered out of the planet = 3561000 meters.
No. of frames required for the storm to encase the shown area = 7 Frames.
Using a word to minute calculator here, and assuming 1 word per empty frame:
No. of words = 11
Timeframe = 0.1 minutes = 6 seconds.
Speed of storm = 3561000/6 = 593500 m/s (Mach 1730.320699708, or Massively Hypersonic+).
We already know that this was blizzard, but we should also know that this was snow as well, and snow has density as well. So i will calculate both heat of fusion and KE.
First, we get the heat of fusion.
Planet diameter = 988px = 12750km
Esdeath's freeze = 276px = 3561km, or 1780.5km radius
Freeze height = 43px = 555km
Volume of spherical cap = 2853248897.6907km^3, or 2.8532e18m^3
Density of air = 1.225 kg/m^3
Mass of air frozen = ~3.5e18 kg
Specific heat capacity = 1005 J.kg
Keep in mind that during a blizzard, the air temperature goes down as low as -12 degrees. This may go down even lower.
Change in temperature = 11.5-(-12) = 23.5 degrees, or DeltaT Q = MC(Delta T) = (3.5e18 kg)(1005 J/kg)(23.5 degrees) = 8.266e22 Joules, or 1.98e13 Tons of TNT. (1)
Now, for the KE.
Density of snow = 400 kg/m^3. (That's wind packed snow)
Radius covered by snow = 1780500 meters.
Volume of snow covered = 2.364365117191e19 m^3.
Mass Frozen = 9.457460468764e21 kg.
Speed of snowstorm = 593500 m/s.
Using our handy-dandy KE calculator:
KE = 1.66566e33 Joules, or 3.981022944551e23 Tons of TNT. (2)
Adding (1) and (2) together:
Total energy output = 398.1022944749 Zettatons of TNT. (Planet Level).
Freeze! = 398.1022944749 Zettatons of TNT. (Planet Level).