Aurora Forecast and Prediction for Fort Yukon Airport, Alaska
Kp: 0.33 | Bz: -0.9
Best Viewing Window: 6:32 PM – 8:22 AM AKDT (13h 50m) · peak hours typically 12:47 AM – 4:47 AM
Best Viewing Window:
6:32 PM – 8:22 AM AKDT 
Full Moon 100%
Space Weather Now
Timing: Tonight
3-Day Forecast for Fort Yukon Airport, Alaska
Oct 25
Kp 2 is enough to bring the aurora high overhead at Fort Yukon Airport, not just low on the northern horizon.
Global: Quiet planetary conditions expected - aurora mostly confined to the far north.
Best time to look up: 1:00 AM–4:00 AM AKDT
30% chance of elevated activity · Kp 2 during viewing window
Oct 26
Kp 1.3 is right around the roughly Kp 1 Fort Yukon Airport needs - a borderline night, worth a look to the north.
Global: Quiet planetary conditions expected - aurora mostly confined to the far north.
Best time to look up: 1:00 AM–4:00 AM AKDT
10% chance of elevated activity · Kp 1.33 during viewing window
Oct 27
Kp 1.7 is enough to bring the aurora high overhead at Fort Yukon Airport, not just low on the northern horizon.
Global: Quiet planetary conditions expected - aurora mostly confined to the far north.
Best time to look up: 1:00 AM–4:00 AM AKDT
10% chance of elevated activity · Kp 1.67 during viewing window
Aurora Oval & Satellite & Sun
Interactive Aurora Globe
Satellite View
Sunspots
Current sunspot number: 22
Coronal Mass Ejections
Aurora Photography by Todd Salat
Original prints from Todd Salat's collection.
Whirled View
Turnagain Arm · 2015
White Satin
Kenai Mountains · 2017
AK Caboose
Portage Depot, Alaska · 2021
Nerd Mode
Solar Wind & IMF (GSM)
- Bt
- 3.2 nT
- Bx
- -0.1 nT
- By
- 3.1 nT
- Bz
- -0.9 nT
- Clock Angle θ
- -16.2°
- Cone Angle φ
- 92.8°
- Speed
- 342 km/s
- Density
- 4 p/cc
IMF Detail (GSE) & Source
- Bx
- -0.1 nT
- By
- 3.2 nT
- Bz
- -0.3 nT
- θ Angle
- -5.4°
- φ Angle
- 92.6°
- Satellite
- SOLAR-1
- Data Quality
- Good
- Reading Time
- Oct 25, 3:16 PM AKDT
Geomagnetic Indices
- Kp (now)
- 0.33
- Dst
- 18 nT
- HPI
- 8 GW
- Sunspot Number
- 22
Aurora Model
- Ovation Value
- 0
- Ovation Label
- None
- Model Data Time
- Oct 25, 4:27 PM AKDT
- Ovation Data
- Live
Scores & Ratings
- Aurora Visibility
- 0 · Poor
- Aurora Visibility (w/ Moon)
- 0 · Poor
- Prediction Score
- 35 · Weak Activity
Sky & Location
- Cloud Cover
- 99% · Overcast
- Clouds, Next Dark Window
- 99% · Overcast · ×0.05
- Aurora Visibility Tonight
- 2 · Poor (Outlook Tonight 35 × cloud 0.05)
- Solar Elevation
- 8.2° · Daytime
- Moon Phase
- Full Moon
- Moon Illumination
- 100%
- Moon Altitude
- -4° · Below Horizon
- Latitude
- 66.57139
- Longitude
- -145.25027
- Geomagnetic Latitude
- 67.6°
- Horizon Threshold
- Kp 1
- Overhead Threshold
- Kp 1
Prediction Model Inputs
- Bz Persistence (60min)
- 1.1 nT
- Newell Coupling
- 2861
- Latitude Gate
- 0.87 now · 1.00 tonight (horizon Kp 0, verdict rounds to Kp 1)
- Dynamic Pressure
- 0.8 nPa
- Storm Watch (CME)
- —
- Watch Predicted Kp
- —
Timing & Signal Agreement
- Timing
- Tonight
- Signal Agreement
- Low (1 of 5)
- Do the live inputs point the same way as the score? A score lifted by this city's own Kp can read Low while the solar wind is calm.
- L1 Delay
- ~73 min
- Magnetic Midnight
- 2:47 AM (peak hours 12:47 AM – 4:47 AM)
- Best Viewing Window
- 6:32 PM – 8:22 AM AKDT (13h 50m)
3-Day Kp Forecast
| UT slot (AKDT) | Oct 26 UT | Oct 27 UT | Oct 28 UT |
|---|---|---|---|
| 00–03 UT (4:00 PM–7:00 PM) | 3 | 1.67 | 1.33 |
| 03–06 UT (7:00 PM–10:00 PM) | 2 | 1.33 | 1.33 |
| 06–09 UT (10:00 PM–1:00 AM) | 2 | 1.33 | 1.67 |
| 09–12 UT (1:00 AM–4:00 AM) | 2 | 1.33 | 1.33 |
| 12–15 UT (4:00 AM–7:00 AM) | 2 | 1.33 | 1.33 |
| 15–18 UT (7:00 AM–10:00 AM) | 2 | 1.33 | 1.33 |
| 18–21 UT (10:00 AM–1:00 PM) | 2 | 1.67 | 1.67 |
| 21–00 UT (1:00 PM–4:00 PM) | 2.33 | 1.67 | 1.67 |
| Max | 3 | 1.67 | 1.67 |
| Ap Index | 8 | 5 | 5 |
Columns are NOAA's UT days, so in AKDT a column's first rows fall on the previous local evening.
Storm Probability
| Level | Oct 26 UT | Oct 27 UT | Oct 28 UT |
|---|---|---|---|
| Active | 30% | 10% | 10% |
| Minor storm | 5% | 1% | 1% |
| Moderate storm | 1% | 1% | 1% |
| Strong-Extreme storm | 1% | 1% | 1% |
Planetary K-index
Interplanetary Magnetic Field Bz-0.9 nT now
Southward (negative) Bz favors aurora. Observed data only, no forecast product exists for Bz.
Total IMF Field Bt3 nT now
Total interplanetary magnetic field strength - the ceiling on how negative Bz can go. A rising Bt alongside a still-fluctuating Bz often leads a stronger southward turn. Observed data only, no forecast product exists for Bt.
Global Storm Trend11 global now
Global (hemisphere-wide, not this city) prediction score over the last 24 hours, logged every 5 minutes - may differ from the Prediction ring above, which is specific to this location and time of night. Red from 60 (Strong), yellow from 40 (Moderate), teal below - the same cutoffs as the Prediction ring. Dashed line is the overall trend.
Dst History18 nT now
Kyoto Dst geomagnetic storm index over the last 24 hours. Negative = ring-current energy stored = an active storm, not just predicted. Red below −50nT, yellow −20 to −50nT, teal above −20nT.
Solar Wind Speed & Pressure
Each line is scaled independently to its own 24h range (different units) - watch the shape, not a shared axis. A rising speed line or a pressure spike can signal an incoming stream or shock before Bz/Dst move.
Nerd Mode: See what’s really driving the score. Live solar wind, Bz, Kp, Dst, CME timing, and more. Data comes from NOAA SWPC and the Kyoto WDC, with a few metrics calculated here from the raw data. Live data refreshes every minute; trend charts every five.
Debug / Test Data
UTC: 2026-10-25 23:22:29
| Variable | Value |
|---|---|
| Geo | |
| locale (GET) | fort-yukon-airport-alaska |
| pred_city | Fort Yukon Airport |
| pred_region | Alaska |
| pred_lat | 66.57139 66.57139° N |
| pred_lon | -145.25027 145.25027° W |
| pred_tz | America/Anchorage |
| Cloud Cover (Open-Meteo) | |
| cloud_pct | 99% |
| cloud_cover | overcast |
| cloud_mult | 0.05 (5%) |
| Sky Darkness | |
| dark_elev | 8.17° |
| dark_label | Daytime |
| dark_mult | 0.00 (0%) |
| Space Weather | |
| cKp (current) | 0.33 |
| bz (nT) | -0.9 |
| speed (km/s) | 342 |
| day1_max Kp | 3 |
| day2_max Kp | 1.67 |
| day3_max Kp | 1.67 |
| Aurora Score 0–4 None · 5–19 Weak · 20–49 Nearby · 50–100 Overhead | |
| ovation_val | 0 (None) |
| ovation_time | 2026-10-26T00:27:00Z |
| space_score | 0 |
| Space Weather | |
| bz_score | 9% |
| bz_bar | 54.5% (visual) |
| kp_score | 4.7% |
| fcst_score | 42.9% |
| Visibility Score 0.15×Ovation + 0.55×Bz + 0.30×Kp | |
| activity_score | 30 |
| Aurora Visibility Visibility Score × cloud × darkness | |
| × cloud_mult | 0.05 (Overcast) |
| × dark_mult | 0.00 (Daytime) |
| aurora_score | 0 (Poor) |
| Aurora Visibility Tonight Outlook Tonight × cloud (dark window) × 1.0 | |
| pred_score_tonight | 35 (Weak Activity) |
| × cloud_mult_tonight | 0.05 (Overcast 99%) |
| aurora_score_tonight | 2 (Poor) |
| Cache Freshness * = per-request, no cron | |
| Kp Index _kps/ | fresh 27s / 60s |
| Bz / RTSW _kps/ | fresh 27s / 60s |
| Solar Wind _kps/ | fresh 27s / 60s |
| Sunspots _kps/ | fresh 20.6h / 24h |
| Ovation Aurora outlook/ | fresh 3m / 5m |
| 3-Day Geomag * outlook/ | fresh 21m / 1h |
| GeoIP DB geoip/ | fresh 15.8h / 168h |
| geo (newest) * outlook/geo/ | fresh 87s / 24h |
| wx (newest) * outlook/wx/ | fresh 0s / 20m |
| Image Cache /_files/_dynamic/_images/ · cron every 15m | |
| Ovation North | fresh 27s / 15m |
| Ovation South | fresh 27s / 15m |
| Sat - Alaska | fresh 27s / 15m |
| Sat - N. America | fresh 27s / 15m |
| Sat - N. Atlantic | fresh 26s / 15m |
| Sat - Europe | fresh 25s / 15m |
| Sat - Australia | stale 5.4h / 15m |
| Sat - S. America | fresh 26s / 15m |
Legend
| Visibility Rating (aurora_score /100) | ||
|---|---|---|
| Poor | 0–29 | Little chance of seeing aurora |
| Fair | 30–49 | Possible under ideal conditions |
| Good | 50–69 | Good chance if skies clear |
| Excellent | 70–100 | Strong aurora likely visible |
| Ovation Label (0–100 scale) | ||
|---|---|---|
| None | 0–4 | No aurora activity at location |
| Weak | 5–19 | Faint aurora, auroral oval nearby |
| Nearby | 20–49 | Aurora active, oval edge overhead |
| Overhead | 50–100 | Aurora directly overhead |
| Cloud Cover Multiplier (cloud_pct %) | ||
|---|---|---|
| Clear | 0–25% | × 1.00 |
| Partly Cloudy | 26–50% | × 0.85 |
| Mostly Cloudy | 51–85% | × 0.50 |
| Overcast | 86–100% | × 0.05 |
| Unknown | — | × 0.60 |
| Label | Elev. | Mult | Setting | Rising |
|---|---|---|---|---|
| Daytime | ≥ 3° | × 0.00 | Sun above horizon. Check back after sunset. | Sun well above horizon. Aurora viewing is over. |
| Appr. Civil | 0–3° | × 0.00 | Sunset imminent. Watch for aurora soon. | Approaching sunrise. Aurora window closing. |
| Civil Twilight | −4–0° | × 0.10 | Too bright yet. Darkness improving. | Brightening. Last chance to catch aurora. |
| Appr. Nautical | −6–−4° | × 0.10 | Sky darkening. Faint aurora may be visible. | Sky brightening. Window narrowing. |
| Nautical Twilight | −12–−6° | × 0.50 | Sky darkening. Bright aurora may be visible. | |
| Astronomical Twilight | −18–−12° | × 0.85 | Near-dark sky. Good aurora viewing conditions. | |
| Dark Night | < −18° | × 1.00 | Full darkness. Optimal aurora viewing. | |
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