Figure 1. Example of a single-forecast upper-air diagnostic plot for ETA forecasts of temperature (C), relative humidity (%), dewpoint (C), u-component winds (m/s), v-component winds (m/s), and geopotential height (m) valid at Great Falls, MT. (TFX) on October 29th, 1998 at 1200 UTC. Model bias errors are shown for the initialization (red), 12-h forecast (orange), 24-h forecast (yellow), 36-h forecast (green) and 48-h forecast (blue).