A CRJ-200 caught a wingtip during a gusty-wind landing at DCA with a low time First Officer flying contrary to company policy at special airports.

Narrative

[We were on the] normal River Visual 19 approach. Winds had increased since the hour-old issued weather used for approach briefing; and in the flare a gust caught the right wing and abruptly banked aircraft to the left. Captain assisted First Officer in returning the aircraft to wings level; and assumed control for the landing roll-out. During post-flight; scratches to bottom of left winglet were observed; as apparently wing had momentarily contacted runway surface prior to main gear touchdown. No notice in the flare of apparent wing contact with the runway so [it] must have occurred simultaneously with left main wheel touchdown. Scratched bottom surface was noticed during routine post-flight walk around. [We had] slight margin for error in the flare; made worse by the timing of wind gust. Gusty conditions (approximately 250 at 20). Maintenance and Dispatch notified by phone immediately; followed shortly thereafter with a phone call received from Chief Pilot. Low time First Officer limitations were considered during the briefing as reported wind was approximately 240 at 14 KTS gusting to mid 20's. However; after years of flying with experienced First Officers I failed to consider and apply DCA as being a special airport. Apparently over the course of the hour since weather was reported on ATIS winds had shifted to the west and increased intensity; which unknowingly put the crosswind component over 15 KTS and complicated the flare with higher winds and gusts. Better situational awareness of requesting updated wind conditions would've been a cue to still fly the approach as Captain; although a gust and wing strike could happen just as easily to me or anyone else.