Correct me if I am wrong, but isn't this the weather that would have been available to the Pilots:
KCLT 152152Z 00000KT 10SM SCT060TCU SCT250 32/16 A3010 AO2 SLP184 TCU NE AND NW T03220156
some 45 minutes prior to first impact. calm winds, 10 miles visibility, sct towering cumulus at 6000' etc.
Many years ago the US FAA went to contract weather observers and getting a "SPECIAL" observation is still tough.
Of course it is the difference between wind on the ground and during the approach that makes all the difference.