01
Mist (BR) is by far the most common code at MDT — 12.1% of hours. Peaks in fall and winter when the Susquehanna remains warm relative to cooling air, generating persistent low-level moisture and reduced visibility across the floodplain.
02
MDT records more fog (FG) than CXY in every season. The FG frequency difference is most pronounced October-December, consistent with the river cooling season driving surface fog formation at the lower floodplain site.
03
Freezing rain frequency is similar at both sites, but MDT shows slightly higher -FZRA occurrence. The river valley keeps surface temperatures near freezing longer during CAD events, extending the window for freezing precipitation.
04
Thunderstorm frequency (TS/TSRA) is comparable. Neither station shows systematic convective enhancement or suppression — consistent with similar exposure to synoptic-scale convective events across the 3.3-mile separation.