Sure. Just read the lat/lon data file, substitute the dot woth underscore and do a dir() with that string in the filename wildcard expression to return the specific file.
latlon=readlines('yourlocationsfile.ext');
for i=1:numel(latlon)
ll=strrep(latlon(i),'.','_');
d=dir("SNOWBAND*"+ll+".txt");
fn=fullfile(d.folder,d.name);
% do whatever with the file here
...
end
First time I ran this I'd probably add the fully-qualified filename to the latlon file to go with it so had them both together; then just read the one file and get what you're looking for. Probably make sense to also separate out the lat/lon data into separate values for lat and long as numeric values to be able to do searches for ranges and/or specific values directly as well. Preprocessing and creating a more useful database could save a bunch of time later on...
