[OpenMap Users] shapefile checking bounds

My problem is fairly complex but somewhat straightforward.

I have a shapefile of National Weather Service warnings and watches.

I want to be able to take the extents that the OpenMap is viewing (i.e. the
4 lat/lon corners) and check if any /shape/ in the shapefile intersects. Or
in other words is within their viewing area (or at least a piece of one)?

Is there any good way anyone knows of to do this?

Ben

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