Recon just returned a dropsonde in the eye of 998mb. There was 7kt winds, so it might not have been dead center.

Edit - vortex message in:

292
URNT12 KNHC 122247
VORTEX DATA MESSAGE AL092007
A. 12/22:34:40Z
B. 28 deg 41 min N
094 deg 50 min W
C. 850 mb 1413 m
D. 53 kt
E. 026 deg 13 nm
F. 122 deg 041 kt
G. 027 deg 014 nm
H. 998 mb
I. 15 C/ 1532 m
J. 20 C/ 1537 m
K. 17 C/ NA
L. NA
M. NA
N. 12345/8
O. 0.02 / 1 nm
P. AF306 0209A CYCLONE OB 23
MAX FL WIND 42 KT NW QUAD 20:47:50 Z
GOOD RADAR BANDING