NHC website...under Aircraft recon on the left side.
http://www.nhc.noaa.gov/reconlist.shtml
Latest report showing she is still Alive.

URNT11 KNHC 110757
97779 07204 70294 85019 15400 13065 14149 /2463
RMK AF305 0901A ARLENE OB 06

29.4 85.0 location of report only!
154 dkm above surface (5051ft )
13065 wind 130deg SE at 65kts
1414 Temp 14C dew point 14C (relative humidity near 100%-rain)

The winds at 5051ft will reduce to a lower speed at the surface. NHC/TPC has a formula for this, but I'm not sure what it is. I would think that 75% of the 65kts would be a safe reduction to the surface.
That would be around 49kts or 57 mph at the surface...this is My guess. You'll have to wait on NHC to give a statement to get their actual surface wind speed.
Arlene is a strange storm and I'm not sure how they are able to keep up with her ramblings and vortices.