Powerful geomagnetic storm could spark northern lights as far south as Illinois March 18-19
The National Oceanic and Atmospheric Administration’s (NOAA) Space Weather Prediction Center (SWPC) has issued a G2 geomagnetic storm warning for March 19 (UTC) — which interprets to late March 18 in North America — with G1 circumstances more likely to proceed into March 20, as a number of coronal mass ejections (CMEs) head towards Earth. Geomagnetic storms are categorised utilizing a G-scale, which ranks their depth from G1 (minor) to G5 (excessive).
While the preliminary forecast centered on a single CME launched throughout an M2.7 photo voltaic flare on March 16, forecasters now say at the least 4 CMEs could affect Earth in fast succession, doubtlessly extending and complicating geomagnetic exercise by means of March 20-21.
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This is nice information for aurora chasers as the anticipated G2-level storm could convey northern lights as far south as New York and Idaho, however NOAA’s SWPC says there’s a probability that G3 ranges could be reached, which could result in aurora sightings deep into mid-latitudes such as Illinois and Oregon.
When will the photo voltaic storm hit?
The potential arrival time for the incoming photo voltaic storms continues to be evolving, and is determined by which of the a number of CMEs strike Earth and what impact they’ve.
According to NOAA’s latest forecastthe primary impacts could start as early as 11 pm EDT March 18 (0300 GMT March 19), with reasonable (G2) geomagnetic storm circumstances almost definitely between 2:00 am and eight am EDT (0600-1200 GMT).
However, different fashions, together with these cited by the UK Met Office, recommend the primary CME could arrive in a while March 19 and even early March 20, prolonging auroral exercise by means of the weekend.
Because a number of eruptions are concerned, geomagnetic exercise could persist for 24-48 hours or longer, moderately than peaking in a single quick burst. So be sure your digital camera batteries are charged! We could be in for a number of nights of aurora reveals down at mid-latitudes.
There are respectable probabilities for some geomagnetic storming this weekend and auroral shows additional equatorward than standard. NOAA SWPC has a G2 / reasonable storm look ahead to Thursday March 19 and a G1 / minot storm look ahead to Friday March 20. This is in response to at the least FOUR CMEs… pic.twitter.com/o7tGTUKrjTMarch 18, 2026
Will auroras really be seen?
Even throughout sturdy geomagnetic storms, aurora visibility is rarely assured.
While G2 circumstances can push the auroral oval southward, how far auroras are seen is determined by elements like magnetic subject orientation, storm timing and native climate circumstances.
Auroras are additionally extremely dynamic, usually intensifying throughout short-lived bursts identified as substorms — that means one of the best shows could final solely minutes at a time.
Clear, darkish skies and timing your viewing round peak geomagnetic exercise might be key.
But if there may be even an opportunity you may get an excellent present and your climate forecast is trying clear, I’d undoubtedly be heading outdoors and preserving a watch out, as you by no means actually know!
Seasonal increase to auroras
This week’s storm watch comes at an particularly thrilling time for aurora hunters, with many relating to March as one of the best months to see the northern lights.
Around the spring and autumn equinoxes, Earth’s orientation in house makes it simpler for its magnetic subject to attach with the magnetic subject carried by the photo voltaic wind and incoming CMEs. This seasonal increase in geomagnetic exercise is thought as the Russell-McPherron impact, first described by geophysicists Christopher Russell and Robert McPherron in 1973.
During the equinoxes, the sun shines straight over Earth’s equator, giving each hemispheres equal day and evening. This geometry additionally helps incoming solar wind work together extra successfully with Earth’s magnetic subject.
For many of the yr, Earth‘s tilt reduces this interplay, serving to to deflect among the incoming charged particles. But across the equinoxes, that pure defend turns into extra open to incoming photo voltaic wind. As a outcome, house climate occasions such as quick photo voltaic wind from coronal holes or CMEs can ship a stronger affect, growing the probabilities of auroras.
Stay tuned!
Keep up to date with the latest space weather news with our aurora forecast live blog. For real-time forecasts based mostly in your location, think about using an area climate app. A terrific choice is “My Aurora Forecast & Alerts” (accessible for iOS and Android). For a deeper dive into house climate circumstances, “Space Weather Live” is one other wonderful alternative (accessible for iOS and Android)
Northern Hemisphere aurora forecast courtesy of the UK Met Office
Editor’s notice: This article has been up to date with the newest forecasts from NOAA and the UK Met Office, together with revised storm timing, up to date geomagnetic storm ranges and new info indicating a number of coronal mass ejections (CMEs) at the moment are anticipated to affect Earth.
