“The Met Éireann app uses forecast model data with a horizontal grid spacing of 2.5km, whereas other apps such as Yahoo Weather or the Weather app use information from models with a much coarser horizontal grid spacing, upwards of 10km and sometimes even 25km,” said Dr Alan Hally of Met Éireann. “The forecasting model we use at Met Éireann is also refreshed eight times per day compared to twice daily for the information feeding these other weather apps.Įven still, no forecasting system is bulletproof, says Alan O’Reilly who runs the popular online meteoreology Twitter account Carlow Weather. While these are broadly right, their underlying forecasting systems aren’t as zeroed-in on local areas as those used by Met Éireann, which divides its zones into parcels that are just 2.5km across. Other Android smartphones use Accuweather’s data as their weather feed. The default ‘weather’ app, for example, on both iPhones and Samsung phones pull their forecasting from a US division of IBM called The Weather Company (branded in the lower left corner as ‘The Weather Channel’).
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