#!/bin/sh
for i in *.mtc43; do
        coor=$(echo $i | sed 's/_/,/; s/_.*//')
        (
                echo -e "\n\nWind\n(m/s)"
                grep $coor vs.txt | cut -d, -f3
        ) > tmp.$$
        paste $i tmp.$$ > tmp2.$$
        mv tmp2.$$ $i
done

rm -f tmp*.$$