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Prediction Detail

Prediction for CME (2019-03-20T08:24:00-CME-001)

CME Observed Time: 2019-03-20T08:24Z
CME Shock Arrival Time: 2019-03-24T20:43Z
Observed Geomagnetic Storm Parameters due to CME:

Predicted Arrival Time: 2019-03-24T00:00Z (-12.0h, +12.0h)
Prediction Method: Other (SIDC)
Prediction Method Note:
:Issued: 2019 Mar 20 1735 UTC
:Product: documentation at
# FAST WARNING 'PRESTO' MESSAGE  from the SIDC (RWC-Belgium)         #
STEREO-A COR2 beacon data shows at least two CMEs this morning, related with the flares from the unnumbered active region northwest of AR 2735. A slow one (~300 km/s) around 9:00 UT and a faster one (~500 km/s) around 12:00 UT, the last one related to a C4.8 flare. These CMEs are most likely Earth directed. At this moment there is no LASCO data available (data gap between 8:00 UT and 16:00 UT) so a better estimation of the speeds and directions of propagation is not possible. Due to the location of the source region, these CMEs will arrive to the Earth late on March 23 or on March 24.
Lead Time: 99.13 hour(s)
Difference: 20.72 hour(s)
Prediction submitted by Yihua Zheng (GSFC) on 2019-03-20T17:35Z
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Important Disclaimer Notice

If you are looking for the official U.S. Government forecast for space weather, please go to NOAA's Space Weather Prediction Center ( This "Experimental Research Information" consists of preliminary NASA research products and should be interpreted and used accordingly.

NASA Official: Dr. Maria Kuznetsova
Curator: Chiu Wiegand