Can you see the northern lights in Tennessee tonight?
Unlikely: Kp 1.33 at 4:21 PM CDT falls short of the Kp 8 or so that Tennessee's northern horizon requires.
as of
Kp now
1.33
Tennessee needs
Kp 8
Verdict
No chance
Sky tonight
Overcast, 92% cloud
Moon tonight
40% lit, last quarter
Nautical darkness
Darkness 8:02 PM to 6:31 AM
Kp from NOAA SWPC estimated planetary K index. The NWS MRX gridded forecast provides cloud cover for Roan Mountain State Park.
At Roan Mountain State Park, nautical darkness begins at 8:02 PM and holds until 6:31 AM EDT. Tonight's moon, in its last quarter phase, shows 40 percent lit. The sun and moon positions, computed for the date and the viewing spot, supply both numbers, and no forecast plays a part.
What is Kp?
A 0-9 scale called Kp rates the current disturbance of Earth's magnetic field. Its name comes from planetarische Kennziffer, German for planetary index. Thirteen observatories worldwide take the measurements. Higher values mean the aurora reaches further south. Most of the northern US needs a Kp of 5 or higher, while northern Alaska sees it at Kp 0. Full Kp guide.
Why Tennessee needs Kp 8
Because the aurora follows the magnetic field rather than the equator, geomagnetic latitude matters more than map latitude. At Tennessee's northern edge, the reading is 45.7° geomagnetic; the oval only draws level with that latitude at about Kp 8, and the Kp number already includes roughly 5 degrees of cushion, because the high-altitude aurora hangs low on the horizon.
Where to watch from in Tennessee
All three spots in Tennessee can differ in cloud cover, so all three are worth a look. Reelfoot Lake State Park looks clearest tonight, at 30% cover.
| Spot | Cloud tonight | Clearest hour | Nearest town |
|---|---|---|---|
| Roan Mountain State Park | 92% Overcast | 12:00 AM EDT | Roan Mountain |
| Pickett CCC Memorial State Park | 56% Partly cloudy | 3:00 AM CDT | Jamestown |
| Reelfoot Lake State Park | 30% Mostly clear | 3:00 AM CDT | Tiptonville |
Tennessee's Roan Mountain State Park near Roan Mountain is the state's aurora ridge during severe G4 storms. Pickett CCC Memorial State Park near Jamestown and Reelfoot Lake State Park near Tiptonville add mountain and lake views. The ridge looks north over valley. These storms occur about 60 days per cycle. Clear nights are scarce in the mountains.
Can the northern lights reach Knoxville, Memphis and Nashville tonight?
| City | Kp needed | Right now |
|---|---|---|
| Knoxville | Kp 9 | No chance |
| Memphis | Kp 9 | No chance |
| Nashville | Kp 8 | No chance |
Each city's Kp value comes from its own coordinates and geomagnetic latitude, so the further south a city is in the state, the higher the Kp it needs.
Cloud cover, averaged over tonight's viewing window for each location, comes from NWS gridded forecasts.
Was there aurora last night in Tennessee?
The night of October 3 topped out at Kp 3.00, short of the 8 Tennessee needs, so the aurora stayed out of range.
The most recent night in range was January 19, 2026, when the night's highest Kp reached 8.67.
1 nights so far in 2026 have been in range for Tennessee, against a yearly average of 0.5 across the complete years since 1994. The year's highest night Kp so far is 8.67, set on January 19, 2026.
Nights in range by year in Tennessee
| Year | Nights in range | Highest Kp | Peak date |
|---|---|---|---|
| 2026 2026 is not over | 1 | 8.67 | Jan 19, 2026 |
| 2025 | 1 | 8.67 | Nov 11, 2025 |
| 2024 | 2 | 9.00 | May 10, 2024 |
| 2023 | 0 | 7.67 | Apr 23, 2023 |
| 2022 | 0 | 6.00 | Jan 14, 2022 |
| 2021 | 0 | 7.00 | Nov 3, 2021 |
| 2020 | 0 | 6.00 | Sep 27, 2020 |
| 2019 | 0 | 5.00 | Jan 4, 2019 |
| 2018 | 0 | 6.00 | Mar 18, 2018 |
| 2017 | 1 | 8.00 | Sep 7, 2017 |
| 2016 | 0 | 7.00 | Mar 6, 2016 |
| 2015 | 1 | 8.00 | Mar 17, 2015 |
Local time 9 pm to 3 am is the span of a night. The night's Kp is the highest among the three hour windows overlapping those hours. A night is in range when that Kp reached the threshold the state needs, which comes from where the northern edge of the state sits in geomagnetic latitude. Cloud is not in the record, so in range means the aurora was in range, not that anyone saw it. Figures are NOAA Space Weather Prediction Center daily geomagnetic data from 1994 on.
The next three days
NOAA's three-hour Kp outlook. At its highest expected value, Kp 5.00 remains below the Kp 8 threshold Tennessee requires.
| Day | Local window | Kp | In range |
|---|---|---|---|
| Oct 3 | 7 PM to 10 PM CDT00-03UT | 3.00 | No |
| Oct 3 | 10 PM to 1 AM CDT03-06UT | 3.33 | No |
| Oct 4 | 1 AM to 4 AM CDT06-09UT | 4.33 | No |
| Oct 4 | 4 AM to 7 AM CDT09-12UT | 5.00 | No |
| Oct 4 | 7 AM to 10 AM CDT12-15UT | 4.00 | No |
| Oct 4 | 10 AM to 1 PM CDT15-18UT | 3.67 | No |
| Oct 4 | 1 PM to 4 PM CDT18-21UT | 4.67 | No |
| Oct 4 | 4 PM to 7 PM CDT21-00UT | 3.00 | No |
| Oct 4 | 7 PM to 10 PM CDT00-03UT | 3.33 | No |
| Oct 4 | 10 PM to 1 AM CDT03-06UT | 4.33 | No |
| Oct 5 | 1 AM to 4 AM CDT06-09UT | 3.33 | No |
| Oct 5 | 7 AM to 10 AM CDT12-15UT | 2.67 | No |
| Oct 5 | 10 AM to 1 PM CDT15-18UT | 1.67 | No |
| Oct 5 | 4 PM to 7 PM CDT21-00UT | 3.00 | No |
| Oct 5 | 7 PM to 10 PM CDT00-03UT | 3.33 | No |
| Oct 5 | 10 PM to 1 AM CDT03-06UT | 3.67 | No |
| Oct 6 | 1 AM to 4 AM CDT06-09UT | 3.00 | No |
| Oct 6 | 4 AM to 7 AM CDT09-12UT | 3.00 | No |
| Oct 6 | 7 AM to 10 AM CDT12-15UT | 2.33 | No |
| Oct 6 | 10 AM to 1 PM CDT15-18UT | 2.00 | No |
| Oct 6 | 1 PM to 4 PM CDT18-21UT | 2.00 | No |
| Oct 6 | 4 PM to 7 PM CDT21-00UT | 1.67 | No |
NOAA Space Weather Prediction Center three-day forecast, issued 2026 Oct 04 1230 UTC.
The next 27 days
No day in the 27 day outlook from the NOAA Space Weather Prediction Center reaches Kp 8.
This Kp outlook is issued by the NOAA Space Weather Prediction Center at 2026 Sep 28 0221 UTC.
Watching from Tennessee
- The aurora seldom appears overhead in Tennessee; look at the northern horizon instead.
- Away from town lights, allow 20 minutes for your eyes to adjust.
- The aurora is most active from 10pm to 2am local, near magnetic midnight.
- A phone exposure of 3-5 seconds picks up color the eye cannot; a grey glow can photograph green.
Compare every state, ranked right now
The NOAA Space Weather Prediction Center produces the Kp readings and aurora forecasts on this page. As US government works, they are not subject to copyright under 17 U.S.C. 105; this notice is the notice required by 17 U.S.C. 403. Mention of the center does not imply endorsement or affiliation; for attribution, see Data sources and attribution.