73°23°OvercastFeels like 69°21° · Dew point 34°1°
- Track temp
- 83°F28°C
- Rain chance
- 0%
- Wind
- 2mph4km/hE
- Density alt.
- 2,293ft699m
- Barometer 30.33 inHg1027 hPa steady
- Humidity 24%
- Cloud 100%
- UV 1
Forecast updated · Open-Meteo
Next 24 hours
The week Hour by hour
NowOvercastTemperature 73°23°Rain chance 0%Wind 2 mph4 km/hETrack temperature 83°28°
OvercastTemperature 73°23°Rain chance 0%Wind 2 mph4 km/hETrack temperature 83°28°OvercastTemperature 69°21°Rain chance 0%Wind 5 mph8 km/hSETrack temperature 71°22°
OvercastTemperature 66°19°Rain chance 1%Wind 6 mph9 km/hENETrack temperature 66°19°OvercastTemperature 63°17°Rain chance 2%Wind 6 mph10 km/hNETrack temperature 63°17°OvercastTemperature 61°16°Rain chance 3%Wind 6 mph9 km/hNETrack temperature 61°16°OvercastTemperature 59°15°Rain chance 2%Wind 6 mph9 km/hNNETrack temperature 59°15°OvercastTemperature 58°14°Rain chance 3%Wind 5 mph8 km/hNETrack temperature 58°14°OvercastTemperature 57°14°Rain chance 4%Wind 6 mph9 km/hNNETrack temperature 57°14°OvercastTemperature 56°13°Rain chance 4%Wind 6 mph10 km/hNNETrack temperature 56°13°OvercastTemperature 55°13°Rain chance 5%Wind 6 mph10 km/hNNETrack temperature 55°13°OvercastTemperature 54°12°Rain chance 6%Wind 7 mph11 km/hNNETrack temperature 54°12°OvercastTemperature 53°12°Rain chance 5%Wind 7 mph11 km/hNNETrack temperature 53°12°OvercastTemperature 52°11°Rain chance 8%Wind 7 mph10 km/hNETrack temperature 52°11°OvercastTemperature 51°11°Rain chance 6%Wind 6 mph9 km/hNNETrack temperature 51°11°OvercastTemperature 51°10°Rain chance 4%Wind 4 mph7 km/hNETrack temperature 51°10°OvercastTemperature 50°10°Rain chance 6%Wind 6 mph10 km/hNETrack temperature 50°10°OvercastTemperature 52°11°Rain chance 5%Wind 6 mph9 km/hNNETrack temperature 54°12°OvercastTemperature 57°14°Rain chance 4%Wind 3 mph5 km/hNETrack temperature 61°16°OvercastTemperature 64°18°Rain chance 4%Wind 6 mph9 km/hESETrack temperature 72°22°OvercastTemperature 63°17°Rain chance 4%Wind 8 mph12 km/hENETrack temperature 68°20°OvercastTemperature 66°19°Rain chance 5%Wind 4 mph7 km/hSETrack temperature 76°25°OvercastTemperature 65°18°Rain chance 10%Wind 8 mph14 km/hSSETrack temperature 69°20°OvercastTemperature 65°18°Rain chance 4%Wind 9 mph15 km/hSSETrack temperature 71°22°OvercastTemperature 63°17°Rain chance 4%Wind 6 mph10 km/hSSETrack temperature 66°19°Hours in your time zone (the track's when they match). Track temperature is an estimate.
Pit box
The racer numbers
Density altitude2,293ft699mField elevation 1,457 ft
Air density1.145kg/m³93.5% of standard (RAD)
Water grains30grgrains per lb of dry air
Track temp (est.)83°F28°CConcrete in 259 W/m² sun
Dew point34°F1°C24% humidity
Barometer30.33inHg1027hPaSteady over 3 h
Computed from the forecast air temperature, dew point and station pressure (NWS formulas). Track temperature is estimated from sun, wind and the surface; it is not a sensor reading. How these are figured.
This week
Day by day
- TodayOct 3174°23° 44°7° 3%Green flag
- TomorrowNov 166°19° 50°10° 12%Green flag
- MonNov 268°20° 49°9° 12%Green flag
- TueNov 3
76°25° 49°9° 1%Green flag - WedNov 471°22° 53°12° 41%Green flag
- ThuNov 5
65°18° 60°16° 51%Green flag - FriNov 665°18° 58°15° 23%Red flagpartial
| Day | Flag | Sky | High / low | Rain | Gusts | Track temp | Density alt. | Sunrise · sunset |
|---|---|---|---|---|---|---|---|---|
| Today Oct 31 | Green flag | Overcast | 74°23° 44°7° | 3% | 14 mph22 km/h NE | 97°36° | 2,304 ft702 m | 7:50 AM · 6:34 PM |
| Tomorrow Nov 1 | Green flag | Overcast | 66°19° 50°10° | 12% | 16 mph25 km/h NE | 76°25° | 1,771 ft540 m | 6:51 AM · 5:33 PM |
| Mon Nov 2 | Green flag | Overcast | 68°20° 49°9° | 12% | 12 mph19 km/h NE | 83°28° | 2,132 ft650 m | 6:52 AM · 5:32 PM |
| Tue Nov 3 | Green flag | Partly cloudy | 76°25° 49°9° | 1% | 10 mph15 km/h ESE | 94°35° | 2,784 ft849 m | 6:53 AM · 5:31 PM |
| Wed Nov 4 | Green flag | Overcast | 71°22° 53°12° | 41% | 19 mph31 km/h ESE | 80°26° | 2,654 ft809 m | 6:54 AM · 5:30 PM |
| Thu Nov 5 | Green flag | Light drizzle | 65°18° 60°16° | 51% 0.11 in2.9 mm | 4 mph7 km/h E | 67°20° | 2,400 ft732 m | 6:55 AM · 5:29 PM |
| Fri Nov 6 | Red flagrain | Heavy drizzle | 65°18° 58°15° | 23% 0.39 in9.9 mm | 16 mph26 km/h WSW | 69°20° | 2,612 ft796 m | 6:56 AM · 5:28 PM |
Flags judge the racing hours, 9 am to 10 pm at the track. Days marked partial are at the edge of the forecast.
Pit box, all week
Pro Every hour, every number
Today’s remaining 7 hours are free. Pro members get all seven days and the CSV.
| Hour | Air | Dew pt | Humidity | Barometer | Density alt. | Air density kg/m³ | Grains | Track temp (est.) | Wind | Rain |
|---|---|---|---|---|---|---|---|---|---|---|
| 73°23° | 34°1° | 24% | 30.33 inHg1027 hPa | 2,293 ft699 m | 1.145 | 30 | 83°28° | 2 mph4 km/h E | 0% | |
| 69°21° | 34°1° | 27% | 30.32 inHg1027 hPa | 2,050 ft625 m | 1.153 | 30 | 71°22° | 5 mph8 km/h SE | 0% | |
| 66°19° | 34°1° | 30% | 30.32 inHg1027 hPa | 1,841 ft561 m | 1.160 | 29 | 66°19° | 6 mph9 km/h ENE | 1% | |
| 63°17° | 33°1° | 33% | 30.33 inHg1027 hPa | 1,655 ft504 m | 1.167 | 29 | 63°17° | 6 mph10 km/h NE | 2% | |
| 61°16° | 34°1° | 36% | 30.35 inHg1028 hPa | 1,518 ft463 m | 1.171 | 30 | 61°16° | 6 mph9 km/h NE | 3% | |
| 59°15° | 35°1° | 40% | 30.35 inHg1028 hPa | 1,386 ft422 m | 1.176 | 30 | 59°15° | 6 mph9 km/h NNE | 2% | |
| 58°14° | 33°1° | 40% | 30.37 inHg1029 hPa | 1,275 ft389 m | 1.180 | 29 | 58°14° | 5 mph8 km/h NE | 3% |
Every hour from the forecast, the same arithmetic as the pit box above (NWS density-altitude formula; track temperature is an estimate). Hours in your time zone, the track’s when they match.
Raceway Weather Pro
Plan the whole week at Thunder Valley
Pit box, all week
Every forecast hour for the next seven days at Thunder Valley: density altitude, air density, grains, track temp and more, with a CSV for the tuning laptop.
Do the models agree?
ECMWF, GFS and ICON side by side for the next three racing days, so you know when the forecast is shaky.
Next 6 hours of rain
Rain in 15-minute steps for the next six hours at your tracks, refreshed every hour.
Alerts for your tracks
An email the morning a red or yellow flag is due at Thunder Valley, and a heads-up three days out.
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The track
Facts
- Location
- Bristol, Tennessee
- Layout
- Quarter-mile drag strip in Thunder Valley
- Length
- Quarter mile (1,320 ft)
- Surface
- Concrete
- Opened
- 1965
- Series
- NHRA
- Signature events
- NHRA Thunder Valley Nationals
- Time zone
- America/New York
- Elevation
- 1,457 ft (444 m)