Custom tags-pressure change in form darts

Hallo Brian.
I have inquiry and at the same time request.One meteorologic portal at our place in Bohemia portrayals my actual data on : http://meteo-web.cz/index.php?page=online.Fecit I according to their requierement customscreen,but I lack for there one symbol namely baro trend in form darts.(trend pressure air/3 o’clock).In offer set the custom tags I him do not find.If there really isn’t,could it be this symbol new - coined and cover up him to the some new version WD ?