Elin J. Deeb NOAA/SWPC Mentor: Dusan Odstrcil Abstract: Coronal mass ejections (CMEs), which result from solar activity, can lead to intense geomagnetic storms on Earth. The process of predicting and forecasting ICME’s is severely limited. The modeling of the origin of CME’s is still in the research phase. Spacecraft at various lagrangian points are unable to provide much warning when an event occurs; for example, if an ICME with an initial velocity of 1000 km/s is detected at Lagrange Point 1, which is .01 AU from the Earth, it will arrive approximately 25 minutes after the detection. Computations can take anywhere from 12-40 hours and are dependent on the computer speed and computer access. Therefore, SWPC researchers have developed an intermediate modeling system which uses fitted coronagraph observations, specifies 3D ejecta, and drives the 3D numerical magnetohydrodynamic code ENLIL. Various ejecta can be specified to match spacecraft observations at Earth. Comparisons with additional spacecraft observations, especially those of STEREO, would provide the 3D constraints necessary to select the most suitable ejecta for routine simulations of space weather events, which are necessary in providing a larger lead time of geoeffectivity predictions.