If you want to get 3 independent alert types, you can set these alerts in 3 places very close together. First choose these 3 locations as Favorites by clicking on the map. Then change their name « place1, place2, place3... ». The ECMWF model resolution is 9km, so if they are enough close together it should work. For example, 3 places at 3 km distance:
Of course an « OR » operator should be easier for the user but a lot of work for developers.