Once I have a reasonable national weather picture developed, I start localizing my day's understanding by looking at the latest soundings from the Storm Prediction Center at Norman, OK. You will need to select the latest set of soundings, generally done at 0000Z and 1200Z. Then click on the station you are interested in. Generally, I only look at wherever I may be going that day, although I may check some locations along a longer route as well. I am primarily interested in inversions, CAPE values, lifted index values, relative humidity and wind direction/strength. In particular, the CAPE and LI values will give an indication of thunderstorm potential, the proximity of the RH plot to temperature may indicate cloud tops, and the wind barbs will give me an idea of low-level wind shifts that may influence departure and arrival planning.