Full Breakdown
Northern Lights Forecast for July 30-31, 2026: Modest Geomagnetic Activity May Light Up Select Northern U.S. States
7/31/2026, 12:27:24 PM
Core Event – Expected Aurora Display Thursday-Friday Night
Space-weather forecasters at NOAA project a geomagnetic environment that could allow the aurora borealis to be visible in parts of the northern United States on the night of Thursday, July 30, and into Friday, July 31. NOAA’s three-day outlook assigns a planetary Kp index of 4 and estimates a 25 %-30 % chance of a G1-class geomagnetic storm. Under those conditions, the auroral oval is expected to expand southward enough that observers near the Canada-U.S. border may see faint arcs.
Background & Context – Solar Activity and Recent CME Launches
The forecast is tied to two coronal mass ejections (CMEs) that erupted on July 26 and July 27. Those eruptions are traveling toward Earth and could brush the magnetosphere between Thursday and Friday. The Sun is currently in the “maximum” phase of its 11-year cycle, a period that historically produces more frequent solar storms.
Data & Statistics – Forecast Metrics and Geographic Reach
- Kp index: 4 (auroral activity brighter than average but below storm level).
- G1 storm probability: 25 %-30 % (NOAA).
- States with the highest likelihood: Alaska, northern Minnesota, much of Montana and North Dakota, and the northern portions of Washington, Idaho, Michigan, South Dakota, and Wisconsin.
- Additional possible states: Maine, Vermont, New Hampshire.
- Viewing window: Typically between 10 p.m. and 2 a.m. local time.
Official Statements & Responses – NOAA and UK Met Office Outlooks
NOAA notes that the strength of any glancing impact will depend on the polarity of the solar wind.
Conflicting Reports & Gaps – Divergent Space-Weather Assessments
NOAA quantifies a 25-30 % chance of a G1 storm, suggesting a modest chance of auroral visibility in the northern tier of the United States. The UK Met Office predicts that both CMEs will likely bypass Earth, implying a lower probability of any observable aurora. Neither agency provides a definitive timeline for when the CMEs will intersect Earth’s magnetosphere, leaving timing and intensity uncertain.
Why It Matters – Viewing Tips and Limitations
Summer’s short nights and a full “Buck Moon” on July 30 will reduce the window for spotting faint aurora. NOAA advises observers to seek dark locations far north of major light sources, preferably on elevated terrain with minimal light pollution. Photographers should use a tripod, wide-angle lens, and long exposures; smartphones can also capture the display in night or pro mode. Real-time alerts from services such as Space Weather Live, Aurora Now, My Aurora Forecast, and Glendale Aurora can help skywatchers react to rapid changes.
Overall, the July 30-31 forecast points to a modest space-weather event that could reward clear-sky observers in the northern United States with a subtle glimpse of the aurora borealis, provided conditions align and the solar wind’s magnetic field turns southward as it reaches Earth.
