The NWS Storm Prediction Center in Norman had a close brush with a tornado yesterday:
http://www.weather.com/outlook/weather-news/news/articles/tornado-norman-oklahoma_2012-04-14
They certainly had a good view. I was watching several storm spotters near OKC yesterday during that time. I thought I heard one saying that for today the NWS has activated a back-up location at an Air Force Base in ND(?). That’s pretty telling.
I usually gauge how severe the weather will be based on the number of storm spotters on WeatherTAP. Yesterday it looked like they were re-inacting a cattle drive using storm spotters.