The Geomagnetic Disturbance-storm-time (Dst) index is predicted in real time using a Machine-Learning algorithm, driven by NOAA's Deep Space Climate Observatory (DSCOVR) data. During outages in DSCOVR data or problems with the data, this application may instead use the data from the NASA/ACE spacecraft, as provided by the NOAA's Space Weather Prediction Center. The predicted data are compared against the "Quicklook" Dst data derived from ground geomagnetic observatories. Dst is a measure of the severity of the geomagnetic storm. The Dst index drives geomagnetic disturbance models such as NOAA's High Definition Geomagnetic Model - Real-Time (HDGM-RT) as well as to determine the quality of magnetic survey data. Dst is officially calculated as an average value of the horizontal component of the magnetic field observed at four near-equatorial observatories. If you notice anything unusual, please send us an email at geomag.models@noaa.gov.