A Two-Dimensional Study of Block Onset Locations Using a One-Dimensional Index and GIS

Previous climatologies of blocking from this group using a one-dimensional index showed that in the Northern Hemisphere, onsets primarily occurred Pacific Ocean region, eastern Atlantic, and over continental Asia. In Southern western are two active regions for block onset. The development technologies such as Geographic Information System (GIS) visualization software mean ingesting data then rendering it on map has become easier faster. This research previously not archived latitude onset, making comparison onset locations with 2-D indexes difficult. Now, is provided University Missouri Blocking Archive. work shows roughly consistent those found by indexes, but there some key differences based information presented. Here, slightly equatorward upstream presented indexes. Additionally, more persistent blocks stronger versus their less weaker counterparts.