Here's a link to a site that sells weather kits that are used primarily for Wildland fires.
http://www.firecache.com/prodinfo.asp?number=90.6250
Features a Weksler Psychrometer, Dwyer Wind Meter, Brunton "8010G" Basic Compass, 3" x 5" Rite in the Rain notebook, 4 oz. water bottle, spare pocket for small electronics (cell phone, small GPS, or Kestrel), pencil pocket and copy of NWS Weather Charts.
If a hotshot (read pvt) can use it, it's pretty easy. I was a medic on the fireline recently and I would "sling"weather every hour. It shows trends, and lets the line guys know if there are changes in the works. Let me know if you have any questions.
adal