This performance measure tracks the ability of forecasters at NOAA’s Space Weather Prediction (SWPC) to accurately predict geomagnetic storms, which potentially disrupt power systems, spacecraft operations, and navigation systems. The NOAA geomagnetic storm scale (G-scale) ranges from the G1 or minor level where weak power grid fluctuations can occur to the G5 or extreme level. During a G5 event, where aurora may be visible over most of the United States, the power grid can experience equipment damage causing system collapse or blackout; significant satellite damage can occur; and global positioning systems may be inaccurate or temporarily unavailable. Geomagnetic Storm Forecast Accuracy is a percentage that reflects the amount of time that the SWPC geomagnetic storm forecast is correct over a 24-hour period. The 24 hour geomagnetic storm forecast is considered accurate if a G1 or greater storm event was correctly predicted. This calculation also includes geomagnetic storms which were not forecast. This measure is verified based on ground-based magnetometer observations. This measure is averaged over the 60 most recent geomagnetic storms to maintain statistical significance.

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