25 =========== Bill Whelan *AT* Frederick MD
Generally will look at this parameter.

30 =========== ---------- *AT* Mt. Diablo
It's nice to know it's there though.

38 =========== Daniel L Johnson *AT* KLUM, Menomonie, WI
I live in the prairie...

101 =========== ---------- *AT* Ellenville, NY
Not much variability in our area ever observed. Cloudbase is about the same everywhere, just rises as day warms up.

137 =========== Ramy *AT* Yanetz
Use occasionly

141 =========== ---------- *AT* Highland Aerosports / Ridgely MD - Quest Air / Groveland FL
I have to explain this one to people a lot... often, they look at Hcrit and figure that's the ceiling for the day.