Aurora Forecast and Prediction for Girdwood Airport, Alaska
Kp: 0 | Bz: 4.75
Best Viewing Window: 7:09 AM – 7:54 AM AKDT (0h 45m) · peak hours typically 12:49 AM – 4:49 AM
Best Viewing Window:
7:09 AM – 7:54 AM AKDT Space Weather Now
Timing: Now · Signal Strength: High
3-Day Forecast for Girdwood Airport, Alaska
Oct 13
Kp 4 is enough to bring the aurora high overhead at Girdwood Airport, not just low on the northern horizon.
Global: Moderate planetary activity expected - aurora across the high-latitude zone, and lower with a good substorm.
Best time to look up: 7:00 PM–10:00 PM AKDT
35% chance of elevated activity · Kp 4 during viewing window
Oct 14
Kp 3.3 is enough to bring the aurora high overhead at Girdwood Airport, not just low on the northern horizon.
Global: Moderate planetary activity expected - aurora across the high-latitude zone, and lower with a good substorm.
Best time to look up: 7:00 PM–10:00 PM AKDT
20% chance of elevated activity · Kp 3.33 during viewing window
Oct 15
Global: This night's forecast isn't in NOAA's 3-day window yet - check back closer to the date.
This night's forecast isn't available yet - check back closer to the date.
Aurora Oval & Satellite & Sun
Interactive Aurora Globe
Satellite View
Sunspots
Current sunspot number: 93
Coronal Mass Ejections
Aurora Photography by Todd Salat
Original prints from Todd Salat's collection.
Tree of Life
Arctic Circle, Alaska · 2025
Valley of Light
Brooks Range, Alaska · 1999
Whirled View
Turnagain Arm · 2015
Solar Wind & IMF (GSM)
- Bt
- 11.4 nT
- Bx
- 2.4 nT
- By
- -10 nT
- Bz
- 4.75 nT
- Clock Angle θ
- 24.7°
- Cone Angle φ
- 283.4°
- Speed
- 537 km/s
- Density
- 7.8 p/cc
IMF Detail (GSE) & Source
- Bx
- 2.4 nT
- By
- -11.1 nT
- Bz
- -0.1 nT
- θ Angle
- -0.4°
- φ Angle
- 282.2°
- Satellite
- SOLAR-1
- Data Quality
- Good
- Reading Time
- Oct 13, 7:03 AM AKDT
Geomagnetic Indices
- Kp (now)
- 0
- Dst
- -15 nT
- HPI
- 7 GW
- Sunspot Number
- 93
Aurora Model
- Ovation Value
- 0
- Ovation Label
- None
- Model Data Time
- Oct 13, 7:50 AM AKDT
- Ovation Data
- Live
Scores & Ratings
- Aurora Visibility
- 0 · Poor
- Aurora Visibility (w/ Moon)
- 0 · Poor
- Prediction Score
- 4 · Little to None
Sky & Location
- Cloud Cover
- 95% · Overcast
- Clouds, Next Dark Window
- 95% · Overcast · ×0.05
- Aurora Visibility Tonight
- 1 · Poor (Outlook Tonight 24 × cloud 0.05)
- Solar Elevation
- -10.9° · Nautical Twilight
- Moon Phase
- Waxing Crescent
- Moon Illumination
- 6%
- Moon Altitude
- -40.7° · Below Horizon
- Latitude
- 60.96813
- Longitude
- -149.11917
- Geomagnetic Latitude
- 61.8°
- Horizon Threshold
- Kp 2
- Overhead Threshold
- Kp 3
Prediction Model Inputs
- Bz Persistence (60min)
- 7.1 nT
- Newell Coupling
- 4156
- Latitude Gate
- 0.33 now · 1.00 tonight (horizon Kp 1.3)
- Dynamic Pressure
- 3.8 nPa
- Storm Watch (CME)
- ~0h · G1 (Minor)
- Watch Predicted Kp
- 5
Timing & Signal Strength
- Timing
- Now
- Signal Strength
- High
- L1 Delay
- ~47 min
- Magnetic Midnight
- 2:49 AM (peak hours 12:49 AM – 4:49 AM)
- Best Viewing Window
- 7:09 AM – 7:54 AM AKDT (0h 45m)
3-Day Kp Forecast
| AKDT | Oct 13 | Oct 14 | Oct 15 |
|---|---|---|---|
| 4:00 PM–7:00 PM | 4 | 3.67 | 2.67 |
| 7:00 PM–10:00 PM | 4.67 | 4 | 3.33 |
| 10:00 PM–1:00 AM | 5 | 2.67 | 3 |
| 1:00 AM–4:00 AM | 4.33 | 3.67 | 2.33 |
| 4:00 AM–7:00 AM | 4 | 3.67 | 1.67 |
| 7:00 AM–10:00 AM | 3.67 | 3.67 | 1 |
| 10:00 AM–1:00 PM | 3.33 | 3.33 | 1.33 |
| 1:00 PM–4:00 PM | 2.67 | 2.67 | 2.33 |
| Max | 5 | 4 | 3.33 |
| Ap Index | 28 | 20 | 10 |
Storm Probability
| Level | Oct 13 | Oct 14 | Oct 15 |
|---|---|---|---|
| Active | 35% | 35% | 20% |
| Minor storm | 35% | 25% | 5% |
| Moderate storm | 15% | 10% | 1% |
| Strong-Extreme storm | 5% | 1% | 1% |
Planetary K-index
Interplanetary Magnetic Field Bz6.3 nT now
Southward (negative) Bz favors aurora. Observed data only, no forecast product exists for Bz.
Total IMF Field Bt11.4 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 Trend18 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 above 70, yellow 50-70, teal below 50 - same thresholds used everywhere else on this page. Dashed line is the overall trend.
Dst History-15 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.
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