- Track temp
- 52°F11°C
- Rain chance
- 2%
- Wind
- 4mph6km/hE · gusts 12 mph20 km/h
- Density alt.
- -97ft-30m
- Barometer 30.39 inHg1029 hPa falling
- Humidity 70%
Forecast updated · Open-Meteo
Hour by hour
OvercastTemperature 52°11°Rain chance 2%Wind 4 mph6 km/hETrack temperature 52°11°OvercastTemperature 51°11°Rain chance 5%Wind 4 mph7 km/hETrack temperature 51°11°OvercastTemperature 50°10°Rain chance 4%Wind 5 mph8 km/hESETrack temperature 50°10°OvercastTemperature 49°10°Rain chance 3%Wind 5 mph7 km/hETrack temperature 49°10°OvercastTemperature 49°10°Rain chance 3%Wind 4 mph7 km/hESETrack temperature 49°10°OvercastTemperature 49°9°Rain chance 2%Wind 2 mph4 km/hESETrack temperature 49°9°OvercastTemperature 48°9°Rain chance 2%Wind 5 mph7 km/hSETrack temperature 48°9°OvercastTemperature 48°9°Rain chance 2%Wind 5 mph8 km/hSSETrack temperature 48°9°OvercastTemperature 48°9°Rain chance 2%Wind 5 mph8 km/hSSETrack temperature 48°9°OvercastTemperature 48°9°Rain chance 3%Wind 5 mph9 km/hSETrack temperature 48°9°OvercastTemperature 49°10°Rain chance 3%Wind 5 mph8 km/hSETrack temperature 49°10°OvercastTemperature 50°10°Rain chance 2%Wind 4 mph7 km/hSETrack temperature 50°10°OvercastTemperature 50°10°Rain chance 2%Wind 4 mph7 km/hSSETrack temperature 50°10°OvercastTemperature 50°10°Rain chance 2%Wind 5 mph8 km/hSETrack temperature 50°10°
OvercastTemperature 49°10°Rain chance 2%Wind 2 mph3 km/hESETrack temperature 51°10°OvercastTemperature 54°12°Rain chance 3%Wind 1 mph2 km/hENETrack temperature 62°17°OvercastTemperature 60°15°Rain chance 4%Wind 4 mph7 km/hSETrack temperature 73°23°OvercastTemperature 62°17°Rain chance 4%Wind 5 mph8 km/hSSETrack temperature 80°26°OvercastTemperature 64°18°Rain chance 4%Wind 4 mph6 km/hSSETrack temperature 82°28°OvercastTemperature 65°18°Rain chance 4%Wind 4 mph7 km/hSSETrack temperature 84°29°OvercastTemperature 66°19°Rain chance 4%Wind 5 mph7 km/hSSETrack temperature 83°29°OvercastTemperature 67°19°Rain chance 4%Wind 4 mph7 km/hSTrack temperature 81°27°OvercastTemperature 66°19°Rain chance 4%Wind 3 mph5 km/hSSWTrack temperature 75°24°OvercastTemperature 63°17°Rain chance 5%Wind 3 mph5 km/hSSETrack temperature 65°19°Hours in your time zone (the track's when they match). Track temperature is an estimate.
The racer numbers
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.
Day by day
- TodayOct 3159°15° 40°5° 6%Green flag
- TomorrowNov 167°19° 48°9° 7%Green flag
- MonNov 263°17° 53°12° 11%Green flag
- TueNov 375°24° 55°13° 12%Yellow flag
- WedNov 4
68°20° 61°16° 62%Red flag - ThuNov 561°16° 58°14° 35%Red flag
- FriNov 661°16° 55°13° 30%Green flagpartial
| Day | Flag | Sky | High / low | Rain | Gusts | Track temp | Density alt. | Sunrise · sunset |
|---|---|---|---|---|---|---|---|---|
| Today Oct 31 | Green flag | Overcast | 59°15° 40°5° | 6% | 15 mph23 km/h ESE | 81°27° | 304 ft93 m | 8:03 AM · 6:30 PM |
| Tomorrow Nov 1 | Green flag | Overcast | 67°19° 48°9° | 7% | 14 mph22 km/h SSE | 84°29° | 844 ft257 m | 7:04 AM · 5:28 PM |
| Mon Nov 2 | Green flag | Overcast | 63°17° 53°12° | 11% | 24 mph38 km/h S | 68°20° | 739 ft225 m | 7:06 AM · 5:27 PM |
| Tue Nov 3 | Yellow flaggusty wind | Overcast | 75°24° 55°13° | 12% | 31 mph50 km/h S | 85°30° | 1,895 ft578 m | 7:07 AM · 5:26 PM |
| Wed Nov 4 | Red flagrain, gusty wind | Heavy drizzle | 68°20° 61°16° | 62% 0.71 in18 mm | 35 mph56 km/h SSW | 76°25° | 1,574 ft480 m | 7:08 AM · 5:25 PM |
| Thu Nov 5 | Red flagrain | Heavy drizzle | 61°16° 58°14° | 35% 0.85 in21.7 mm | 11 mph18 km/h E | 60°16° | 1,029 ft314 m | 7:09 AM · 5:23 PM |
| Fri Nov 6 | Green flag | Drizzle | 61°16° 55°13° | 30% 0.19 in4.7 mm | 17 mph27 km/h S | 67°20° | 1,164 ft355 m | 7:11 AM · 5:22 PM |
Flags judge the racing hours, 9 am to 10 pm at the track. Days marked partial are at the edge of the forecast.
Every hour, every number
Today’s remaining 5 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 |
|---|---|---|---|---|---|---|---|---|---|---|
| 52°11° | 43°6° | 70% | 30.39 inHg1029 hPa | -97 ft-30 m | 1.228 | 41 | 52°11° | 4 mph6 km/h E · gusts 12 mph20 km/h | 2% | |
| 51°11° | 45°7° | 78% | 30.42 inHg1030 hPa | -200 ft-61 m | 1.232 | 44 | 51°11° | 4 mph7 km/h E | 5% | |
| 50°10° | 46°8° | 87% | 30.41 inHg1030 hPa | -282 ft-86 m | 1.235 | 46 | 50°10° | 5 mph8 km/h ESE · gusts 13 mph21 km/h | 4% | |
| 49°10° | 45°7° | 86% | 30.46 inHg1031 hPa | -374 ft-114 m | 1.238 | 45 | 49°10° | 5 mph7 km/h E · gusts 13 mph21 km/h | 3% | |
| 49°10° | 44°7° | 83% | 30.45 inHg1031 hPa | -369 ft-112 m | 1.238 | 43 | 49°10° | 4 mph7 km/h ESE · gusts 15 mph23 km/h | 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.
Plan the whole week at Flat Rock
Pit box, all week
Every forecast hour for the next seven days at Flat Rock: 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 Flat Rock, and a heads-up three days out.
Getting to Flat Rock
Flat Rock, Michigan
No street address published; directions go to the track itself.
We have not checked parking and camping here yet. The track’s own site has them: official site.
Facts
- Location
- Flat Rock, Michigan
- Layout
- 1/4-mile paved oval
- Length
- 0.25 mi (0.40 km)
- Surface
- Asphalt
- Opened
- 1953
- Series
- Late Models, Street Stocks, Figure 8s, ARCA Trucks, ARCA Menards Series East
- Signature events
- School Bus Figure 8
- Time zone
- America/Detroit
- Elevation
- 604 ft (184 m)