17. A system comprising: a data store configured to store data items, respective geographic locations associated with the data items, and respective probabilities associated with the data items; and a processor in communication with the data store, the processor configured to execute specific computer-executable instructions to at least: receive an indication of geographic grouping criteria; determine, based on the geographic grouping criteria, a plurality of geographic regions; analyze the data items and associated geographic locations to determine a plurality of groups of data items associated with respective geographic regions; for each group in the plurality of groups of data items, analyze the data items of the group to determine, based at least in part on a risk model and one or more attributes of individual data items of the group, an aggregate probability associated with the group of data items, the aggregate probability indicating a level of exposure to a risk associated with at least a portion of the respective geographic region; and generate user interface data useable for rendering a user interface, the user interface including graphical representations of the geographic regions, wherein the graphical representations include visualizations indicative of the aggregate probabilities associated with the groups associated with the geographic regions and visualizations of individual data items from at least one group of data items, wherein a first attribute of a visualization of an individual data item indicates a probability category of the individual data item, and wherein a second attribute of the visualization of the individual data item indicates a predicted change to the one or more attributes of the individual data item.
17. A system comprising: a data store configured to store data items, respective geographic locations associated with the data items, and respective probabilities associated with the data items; and a processor in communication with the data store, the processor configured to execute specific computer-executable instructions to at least: receive an indication of geographic grouping criteria; determine, based on the geographic grouping criteria, a plurality of geographic regions; analyze the data items and associated geographic locations to determine a plurality of groups of data items associated with respective geographic regions; for each group in the plurality of groups of data items, analyze the data items of the group to determine, based at least in part on a risk model and one or more attributes of individual data items of the group, an aggregate probability associated with the group of data items, the aggregate probability indicating a level of exposure to a risk associated with at least a portion of the respective geographic region; and generate user interface data useable for rendering a user interface, the user interface including graphical representations of the geographic regions, wherein the graphical representations include visualizations indicative of the aggregate probabilities associated with the groups associated with the geographic regions and visualizations of individual data items from at least one group of data items, wherein a first attribute of a visualization of an individual data item indicates a probability category of the individual data item, and wherein a second attribute of the visualization of the individual data item indicates a predicted change to the one or more attributes of the individual data item. 20. The system of claim 17 , wherein the geographic grouping criteria specify a granularity of the plurality of geographic regions.