IMHO, call home warranty, find out the original manufacturer, and contact them for a repair or replacement. Many of the windows are double pane with a special gas or dry air between the panes, you cannot replace this, so any repair you make will result in condensation. Also, building codes require a minimum strength glass for storms, once again, you will probably not be able to match these.
The projectile was probably thrown from a string trimmer or lawn mower.
Bottom line I would not recommend or attempt a window repair myself.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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