It prolly won't ever make you money but the first ever weather 'forecast' ocured when the weather office in Goodland telegraphed Dodge City telling of an advancing blizzard. Thereupon Dodge City's weathermen hoisted a warning flag onto the flag pole on this building:
I'll lookup the year if someone wreely wants to know.
P.S. Notice the windows. Often in modern times we think the weather bureau should sell their satellites and buy windows instead.