Magnetic storms in April 2026: when the strongest disturbances are expected
This is indicated by forecasts from the NOAA Space Weather Prediction Centre.
According to NOAA’s 27-day forecast, the first significant period of geomagnetic activity in April will occur between the 9th and 11th. US experts are forecasting a G1 on 9 April, a G2 on 10 April and another G1 on 11 April.
Another significant surge in activity is expected on 18–19 April. NOAA’s weekly forecast indicates that on 18 April the geomagnetic field may again reach G2 level, and on 19 April – G1 level.
Meanwhile, NOAA’s daily 45-day forecast shows elevated values of the Ap index on 9–10 April and 18–19 April as well. The highest values in the April forecast are on 10 April – Ap 40 – and 18 April – Ap 48 – confirming these dates as the most intense in terms of the geomagnetic situation.
What do these forecasts mean and why might they change
NOAA emphasises that the 45-day forecast is indicative and serves primarily for general planning. It is updated daily, whilst shorter 3- and 27-day forecasts are considered more accurate for assessing immediate risks.
On the NOAA scale, a G1 level indicates a weak magnetic storm, whilst G2 indicates a moderate one. Such disturbances can affect power grids, GPS, radio communications and satellite operations. This is precisely why space weather forecasts are regularly monitored not only by weather-sensitive individuals but also by infrastructure and communications operators.
Therefore, in April 2026, the periods of 9–11 and 18–19 April warrant the closest attention. It is on these dates that the most significant geomagnetic disturbances are predicted in the official NOAA forecasts, though estimates may be refined as the dates approach.
As a reminder, on 1 April, Orthodox Christians honour Saint Mary of Egypt. In folk tradition, this day was associated with purification, restraint in words and deeds, as well as with omens used to predict the weather for April.
