Not so fast; the overpressure of a shock wave (whether from a bomb blast or something else) is not related via Bernoulli's equation to a "wind speed". The bomb blast is compressible fluid mechanics.
Review "The Dynamics and Thermodynamics of Compressible Fluid Flow" - Ascher Shapiro. It is a classic textbook in the field of compressible flow phenomena.
You may in fact express any differential pressure as equivalent to a "wind speed", but that will not realistically describe the phenomena of the blast, nor will it be correct for pressure differentials much greater than 4 or 5 psi, because compressibility effects are no longer negligible.
Having said all of that, if you still wish to make that sort of simple "equivalence", consult an undergraduate level fluid mechanics text, or Crane Technical Paper #410, as example references. The basic equation, Bernoulli's equation, is an expression of conservation of energy. For incompressible flows, with little change in elevations between initial and final states:
Pressure + 1/2(density)*(velocity)^2 = constant
Ensure that the units are dimensionally consistent (or just work in SI - it's much easier).
