Drought typically refers to deficiency in precipitation, relative to the local area's climate, which persists over a period of time such that it causes a water shortage. This water shortage may impact streams & rivers, local water supplies, and agriculture.
The U.S. Drought Monitor
Static images. Overview of drought types and drought impacts updated weekly based upon a combination of sources.
Fire Weather Forecasts
Static images. National forecasts of fire weather conditions from the NWS Storm Prediction Center
Drought interactive maps
Interactive maps with dynamic overlays. Not recommended for mobile devices.
NASA SPoRT Soil Moisture
Looping images of satellite-derived soil moisture. Updates daily.