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Just some scientific mumbo jumbo, feel free to ignore
comet impact of this size would create cloud of dust essentialy world wide. It would dim the sun for some time and probably cause plenty of strange weather phenomena. After few days, dimming would be only few percent, but it would still lead to colder summers and winters in year or years to come.
Weather would be anything from colored snow, ice barrages from normal seeming clouds, sudden lighning storms, strange lightning related phenomena such as St Elmo fire or ball lightning, in general in any storm there would be more lightning.
Aurora borealis might be visible closer to equator then usual etc etc...
Of course, in fantasy world there could be also any number of magical effects ...
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Rathan, could you repost the map with our current location, our destination and maybe smaller map wiht more details of the land between those two points? I assume we can get maps of the area, either provided by the lords or in the city before going out. Even if the event changed some features of the land...