The Schematics - deathclaw gauntlet are schematics needed to make the unarmed weapon deathclaw gauntlet in Fallout 3. Possessing multiple copies of the schematics increases the initial repair condition of the weapon: one copy gives a condition percent equal to 75% of the player's repair skill, two get 100%, and three get 125%.
A isolated thunderstorms are just stray thunderstorms. Not anything too big. There might be a storm 20miles away, but there isn't one where you are. Normal storms are usually together in a line because of a cold front.
Lightning without thunder is called heat lightning or wildfire, and is usually intracloud or cloud-to-cloud discharges at altitude. It occurs on warm evenings in humid regions where the lapse rate is large, so that most of the thunder is directed upwards and does not reach the ground.