What part of PA are you in? There are a good number of PA chasers, myself included (although, good chasing setups in PA are hard to come by). I do head out to the Plains for a couple of weeks every year, yes, it does get expensive, but, it is worth it.
Regarding Skywarn, it is the volunteer spotter program for NWS. In SE PA (where I live), it is not a "dispatched" service (not really close to a chasing experience around here). If you are in SE PA (or as far north as Carbon/Monroe Counties), you are covered by the Mount Holly office, and, their Skywarn training sessions are listed at
http://www.weather.gov/phi/classes . Other parts of PA are covered by either Binghamton, State College, Pittsburgh or Buffalo offices.
There is still room on my trip (May 13 to May 29) ... not a tour group, so a little less expensive (but, it is an expensive hobby no matter how you slice it).
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