Sorry, but the MedPage Today article titled "Just How Accurate Are Allergy Forecasts?" was not found in the search results provided. (How accurate are allergy predictions?). The results include information about the accuracy of meteorological weather forecasts and general information about allergies in Slovakia, but not the specific article you asked to summarize. In order to create an accurate and factual summary according to your requirements, I need to have access to the MedPage Today article itself. Without it, I cannot guarantee that the summary would contain only verified facts from this particular source.