Northern Lights tonight in Fountain, CO

Tonight in Fountain

Fountain sits at a geomagnetic latitude of 46.3° N, so the aurora usually needs a Kp index of about 9 or higher before it rises above the northern horizon. Tonight's NOAA forecast peaks at Kp 3 (quiet) during the dark hours, 6.0 short of what Fountain needs.

Open-Meteo expects about 100% cloud cover on average between 8 pm and 7 am local time, with no mostly clear hours.

The Moon is 100% illuminated (full moon), bright enough to wash out a faint aurora, so only a stronger display will stand out. For the best view look north, low on the horizon, from somewhere away from street lights.

Right now NOAA's OVATION model gives up to 0% chance of aurora in the part of the sky visible from Fountain. OVATION is a short-range nowcast (30 to 90 minutes ahead), useful for deciding whether to step outside now.

3-day Kp forecast

None of the next 3 days reaches the Kp 9 that Fountain needs. Kp is a global 0–9 index of geomagnetic activity, issued in 3-hour blocks (UTC); NOAA forecasts beyond 24 hours are uncertain, because storms are triggered by solar eruptions that take 1–3 days to arrive.

Why Fountain needs Kp 9

The aurora forms in an oval around the geomagnetic pole, which sits in the Canadian Arctic (about 80.8° N, 72.8° W), not at the geographic pole. That is why North American cities see aurora further south than European cities at the same latitude. At Kp 0 the oval's edge is near 66° geomagnetic; each step of Kp pushes it roughly 2° toward the equator.

At 46.3° geomagnetic, Fountain needs about Kp 9 for aurora low on the horizon, Kp 9 or more for a display high in the sky. Parker, 93 km away, needs about Kp 8.

Aurora forecast for nearby cities

• Northern lights Security-Widefield
• Northern lights Colorado Springs
• Northern lights Pueblo West
• Northern lights Pueblo
• Northern lights Castle Rock
• Northern lights Parker
• Northern lights Highlands Ranch
• Northern lights Centennial

More sky and weather

• Aurora forecast (all cities)
• Northern Taurids meteor shower
• Meteor showers
• Weather warnings