743
FXXX02 KWNP 110257
WEKFOR

:Product: 27-day Space Weather Forecast
:Issued: 2026 May 11 0150 UTC
# Prepared by the US Dept. of Commerce, NOAA, Space Weather Prediction Center
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#               27-day Space Weather Forecast
#
Forecast of Solar and Geomagnetic Activity
11 May - 06 June 2026

Solar activity is expected to be at low levels, with a chance for
M-class activity (R1/R2-Minor/Moderate), and a slight chance for
X-class (R3-Strong), throughout the outlook period due to the flare
potential of several active regions both currently on the visible
disk and those expected to return from the Sun's farside.

No proton events are expected at geosynchronous orbit.

The greater than 2 MeV electron flux at geosynchronous orbit is
expected to be at high levels on 17-20 May due to influence from a
recurrent, negative polarity coronal hole. The remainder of the
outlook period is likely to be at normal to moderate levels.

Geomagnetic field activity is likely to reach G1 (Minor) geomagnetic
storm levels over 15-17 May; active conditions are likely on 18 May,
23 May, 27 May, and 03 Jun; unsettled conditions are likely over 11
May, 13 May, 21-22 May, and 28 May - 31 May. All enhancements in
geomagnetic activity are due to the anticipated influence of
multiple, recurrent, coronal hole HSSs. The remainder of the outlook
period is likely to be at mostly quiet levels.