| No. | Type | Alerts | Warnings | Watches |
|---|---|---|---|---|
| 1 | Geomagnetic Storm Watch |
G3:
13:00 (GMT) on Thu 4 Jun 2026 to 09:00 (GMT) on Sat 6 Jun 2026 |
Space Weather
Space weather describes changing environmental conditions in near-Earth space. Magnetic fields, radiation, particles and matter, which have been ejected from the Sun, can interact with the Earth’s upper atmosphere and surrounding magnetic field to produce a variety of effects.
Space weather notifications
Aurora forecasts
Northern Hemisphere
The auroral oval is likely to become active later on Thursday evening, with aurora likely to be visible Scotland and Northern Ireland, and a slight chance of sightings from northern England, in response to a potential geomagnetic storm. The activity may last into Friday.
Southern Hemisphere
The auroral oval is likely to become active later on Thursday evening, with aurora likely to be visible across the southern parts of New Zealand and Tasmania, in response to a potential geomagnetic storm. The activity may last into Friday.
Issued at: 01:03 (GMT) on Thu 4 Jun 2026
Forecast overview
Space Weather Forecast Headline: Likelihood of Moderate-Strong geomagnetic activity Days 1-2 (04-05 June). Likelihood of further Moderate-class flares.
Analysis of Space Weather Activity over past 24 hours
Solar Activity: Solar activity is high following a Strong flare in the past 24 hours. This was a powerful flare originating from a region located near the centre disc at 03/1128 UTC.
There are eight sunspot regions visible on the solar disc. The region near the north-central part of the disc remains the most complex one. It contains several small negative-polarity spots arranged in an arc around a larger positive-polarity spot. A Moderate-class flare observed at 03/0136 UTC from the magnetically complex region located north-centre disc. It produced a faint but fast coronal mass ejection (CME), which has been analysed. Results show a likely arrival at Earth during the evening (UTC) of Day 1 (04 Jun).
Another potentially Earth-directed CME was observed following another Moderate-class flare from the same region at 03/0700 UTC. This may give a glancing blow to Earth during late evening of Day 2 (05 Jun).
Solar Wind / Geomagnetic Activity: Solar winds started Slow and are now at Slightly Elevated levels, around 450km/s. The Interplanetary Magnetic Field was Weak to Moderate. The north-south component was generally Weak. Geomagnetic activity was Quiet.
Energetic Particles / Solar Radiation: Solar radiation levels were at normal background values.
Four-Day Space Weather Forecast Summary
Solar Activity: Solar activity is expected to be at Moderate to High levels with a continued likelihood of additional flares of Moderate intensity and activity levels could be High, driven either by a higher frequency of Moderate flaring or by the occurrence of isolated Strong-class events.
Solar Wind / Geomagnetic Activity: Earth is expected to come under the increasing influence from a Coronal Hole's fast wind. In addition, two potentially Earth-directed CMEs are present in the forecast, both associated with the same active region. The first CME is expected to arrive during the evening (UTC) of Day 1 (04 June) and is likely to be the primary driver of enhanced geomagnetic activity. The second CME is currently expected to deliver only a glancing blow later on Day 2 (05 June) to Earth, although its impact remains uncertain.
As a result, geomagnetic activity is expected to increase sharply on Day 1 (04 June), with G1–G2 (Minor to Moderate) geomagnetic storm conditions likely and a chance of isolated G3 (Strong) intervals.
Activity may begin to ease on Day 2 (05 June); however, confidence in this trend remains low due to the possible influence of the second CME, potentially arriving later in the day.
Energetic Particles / Solar Radiation: Solar Radiation counts are at normal background levels and expected to remain so through the period.
Issued at: 00:26 (GMT) on Thu 4 Jun 2026
Solar imagery
SDO AIA-193
This channel highlights the outer atmosphere of the Sun - called the corona - as well as hot flare plasma. Hot active regions, solar flares, and coronal mass ejections will appear bright here. The dark areas - called coronal holes - are places where very little radiation is emitted, yet are the main source of solar wind particles.
Issued at:
SDO AIA-304
This channel is especially good at showing areas where cooler dense plumes of plasma (filaments and prominences) are located above the visible surface of the Sun. Many of these features either can't be seen or appear as dark lines in the other channels. The bright areas show places where the plasma has a high density.
Issued at: