I am currently working with rainfall data from hurricane Harvey in order to better understand how to allocate resources in the event of another disaster. I want to accomplish a few things given this data set.

Import["http://www.srh.noaa.gov/data/ridge2/Precip/qpehourlyshape/ 2017/201708/20170826/nws_precip_2017082607.tar.gz"] 

The following are the elements of the data set:

  {"Centering", "CentralScaleFactor", "CoordinateSystem",    "CoordinateSystemInformation", "Data", "Datum", "Graphics",    "GraphicsList", "GridOrigin", "InverseFlattening", "LayerNames",    "LayerTypes", "LinearUnits", "Projection", "ProjectionName",    "ReferenceModel", "SemimajorAxis", "SemiminorAxis", "SpatialRange",    "StandardParallels"} 

What I want to do is to scale down the opacity of the points on the graph based on the heights of the rainfall (lower opacity for lower rainfall heights) so I can get a clear image of the hurricane. I also want to show rainfall for only Texas and neighboring states. This may seem like a general question but I checked the documentation and I am new to $ Mathematica$ and working with large data sets like this one. Thank you to whomever is taking the time to answer or edit this question.