Lately it has crossed my mind, why do people visit a PWS website?
You may be asking the wrong crowd this question. We are mainly the providers of the sites, not the viewers. I rarely look at other PWS sites unless pointed there by a post here.
I got started in this over 20 years ago with a Digitar weather station. After we moved to our current home, I upgraded to a WMII. When APRS came out, I saw a way to see the weather conditions at home on an amateur radio screen in my truck. After that, my first weather web page in '98 or so was so I could see almost-live weather on the computer at work. And it snowballed from there. SLOweather was always built around what I wanted in a weather portal. It was the same with my webcams. That others enjoy it too is a bonus.
A lot of sites seem to be a show case for the latest effects or what the 'op' has found on the internet today. A lot of pages seem to be regurgitated data, data sent from the 'op's' PWS to another site (WU, YoWindow and the like) and then that page is displayed on the 'op's' site.
I don't regurgitate any weather data that I can't produce myself. I do use radar and forecast information from StrikeStarUS and the NWS. However, even with the NWS, I use the point forecast database instead of the generic one for our City.
So, why do you visit a PWS web site? Is it for the local, accurate and clearly displayed first hand data? Do you visit for forecasts whether it be a simple forecast or more advanced. May be just to see what the weather is now, yesterday or some other time in the past since the PWS started operating.
All those and more... Since starting WeatherElement.com, we've added 21 stations to the SLo County network. It's fascinating to see the difference in conditions over small and medium distances, and to see the difference just a mile or 2 will make in the point forecast. Even across 100' of elevation and 300' of distance, there is sometimes a big temperature difference. None of those big sites (Accuweather, weather.com, intellicast) can show that type of granularity the way an array of PWSes can. WU and PWSweather come close.
From another point of view, for those of you that have some type of user /viewer tracking, which pages do you get the most views on and are those views by local users?
Most is local. However, being a college town, I get a fair number of hits from the parents of students attending Cal Poly, and being a vacation destination, hits from the San Joaquin Valley, as travelers check to see what the weather is before they leave home.
The biggies, though are the main page and lightning tracker during bad weather. I've often stated, "Bad weather makes good hits." Rain is the biggest driver, followed by thunderstorms, and high temps. Cold weather, however, (<30°F is considered cold in our Mediterranean climate) doesn't seem to be as big of a hit driver.
Having said all that, to answer your Subject line question, "What is the purpose of a PWS website?", I suppose a lot of it, too, is, for lack of a better term, vanity. To have a cool site that other people will look at. About the same reasons some people blog, or are active on Facebook, or Twitter, but with a weather focus.