Hi mford,
After working on something similar myself, I figured out that the easiest ways is with a “bounding box” where you enter the lat and long coordinates for the region (in this case of that state). You can do it on the API sampler for free and it codes it for you and spits out the results. But you still need the data download tool to get an API Key.
Here is one discussion I found very helpful: Finding Large Amounts of Sensor Indexes (Bounding Box API Call)