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NOAA Space Weather Forecast

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NOAA Space Weather Forecast


27-day Space Weather Outlook Table

Product type


Update frequency



Jun 5, 2023

Delivery method


The 27-day Space Weather Outlook Table is a numerical forecast of three key solar-geophysical indices: the 10.7 cm solar radio flux, the planetary A index, and the largest daily K values. These 27-day forecasts are based primarily on the persistence of patterns of solar and/or geophysical activity from one 27-day solar rotation to the next.

Solar-terrestrial predictions on time scales of 27 days to several years (medium term) are less developed than short-term (days) or long-term solar cycle scale predictions. Recurrence of solar phenomena varies throughout the solar cycle, and therefore the accuracy of these forecasts is partly a function of the strength of recurrent activity.


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