While some aren't keen on my rough formula. I simply take the Max Flight Level Wind and change the knots to mph. Last Vortex has 89kts MFLWind. Roughly 89mph at surface. Formula for 700mb would be: 89 x 1.15=102.35mph MFLW x 0.91= 93.14mph at surface. The 89kts to 89mph is the quick formula. And gives a rough estimate of the lower end of the maximum surface winds. Here's the Official NHC page on Eyewall Wind Profiles. http://www.nhc.noaa.gov/aboutwindprofile.shtml http://www.nhc.noaa.gov/aboutwindprofile.shtml#fig1
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