- Track temp
- 78°F26°C
- Rain chance
- 0%
- Wind
- 8mph12km/hSSW
- Density alt.
- 255ft78m
- Barometer 29.95 inHg1014 hPa falling
- Humidity 46%
Forecast updated · Open-Meteo
Hour by hour
ClearTemperature 59°15°Rain chance 0%Wind 8 mph12 km/hSSWTrack temperature 78°26°Density altitude 255 ft78 mClearTemperature 60°16°Rain chance 0%Wind 8 mph13 km/hSWTrack temperature 74°24°Density altitude 351 ft107 mClearTemperature 58°15°Rain chance 0%Wind 8 mph13 km/hSWTrack temperature 65°19°Density altitude 240 ft73 mClearTemperature 55°13°Rain chance 0%Wind 7 mph12 km/hSTrack temperature 55°13°Density altitude 7 ft2 m
ClearTemperature 54°12°Rain chance 0%Wind 9 mph14 km/hSTrack temperature 54°12°Density altitude -59 ft-18 mClearTemperature 53°12°Rain chance 0%Wind 10 mph16 km/hSSWTrack temperature 53°12°Density altitude -58 ft-18 mClearTemperature 53°12°Rain chance 0%Wind 10 mph15 km/hSSWTrack temperature 53°12°Density altitude -66 ft-20 mClearTemperature 52°11°Rain chance 0%Wind 7 mph11 km/hSWTrack temperature 52°11°Density altitude -139 ft-42 mClearTemperature 51°11°Rain chance 0%Wind 5 mph8 km/hWTrack temperature 51°11°Density altitude -253 ft-77 mClearTemperature 50°10°Rain chance 0%Wind 6 mph9 km/hWNWTrack temperature 50°10°Density altitude -340 ft-104 mClearTemperature 49°9°Rain chance 0%Wind 5 mph8 km/hNWTrack temperature 49°9°Density altitude -395 ft-120 mClearTemperature 48°9°Rain chance 0%Wind 4 mph7 km/hWNWTrack temperature 48°9°Density altitude -480 ft-146 mClearTemperature 48°9°Rain chance 0%Wind 4 mph6 km/hWTrack temperature 48°9°Density altitude -494 ft-151 mClearTemperature 48°9°Rain chance 0%Wind 7 mph11 km/hWTrack temperature 48°9°Density altitude -490 ft-149 mClearTemperature 47°8°Rain chance 0%Wind 7 mph11 km/hWTrack temperature 47°8°Density altitude -559 ft-170 mClearTemperature 46°8°Rain chance 0%Wind 7 mph11 km/hWTrack temperature 46°8°Density altitude -581 ft-177 mClearTemperature 46°8°Rain chance 0%Wind 7 mph11 km/hWTrack temperature 46°8°Density altitude -623 ft-190 mClearTemperature 45°7°Rain chance 0%Wind 7 mph11 km/hWNWTrack temperature 45°7°Density altitude -747 ft-228 mClearTemperature 48°9°Rain chance 0%Wind 6 mph9 km/hWNWTrack temperature 52°11°Density altitude -540 ft-165 m
Partly cloudyTemperature 53°12°Rain chance 0%Wind 12 mph19 km/hNWTrack temperature 62°17°Density altitude -193 ft-59 mClearTemperature 55°13°Rain chance 0%Wind 16 mph25 km/hNWTrack temperature 68°20°Density altitude -79 ft-24 mClearTemperature 56°13°Rain chance 0%Wind 16 mph25 km/hNWTrack temperature 72°22°Density altitude -15 ft-5 mMostly clearTemperature 57°14°Rain chance 0%Wind 15 mph24 km/hWNWTrack temperature 74°23°Density altitude 62 ft19 mClearTemperature 58°15°Rain chance 0%Wind 15 mph24 km/hNWTrack temperature 75°24°Density altitude 127 ft39 mHours are track time (EST). Track temperature is an estimate. DA is density altitude.
The racer numbers
Computed from the forecast air temperature, dew point and station pressure (NWS formulas; the correction factor by SAE J1349 and the older 60 °F STD standard). Track temperature is estimated from sun, wind and the surface; it is not a sensor reading. How these are figured.
Day by day
- TodayNov 860°16° 42°6° 0%Green flag
- TomorrowNov 959°15° 45°7° 0%Yellow flag
- TueNov 10
67°19° 41°5° 0%Green flag - WedNov 1165°18° 49°10° 0%Green flag
- ThuNov 12
61°16° 52°11° 37%Yellow flag - FriNov 1355°13° 43°6° 39%Yellow flag
- SatNov 1448°9° 40°5° 24%Yellow flagpartial
| Day | Flag | Sky | High / low | Rain | Gusts | Track temp | Density alt. | Sunrise · sunset |
|---|---|---|---|---|---|---|---|---|
| Today Nov 8 | Green flag | Clear | 60°16° 42°6° | 0% | 22 mph35 km/h WSW | 81°27° | 351 ft107 m | 6:40 AM · 5:01 PM |
| Tomorrow Nov 9 | Yellow flaggusty wind | Partly cloudy | 59°15° 45°7° | 0% | 32 mph51 km/h NW | 75°24° | 162 ft49 m | 6:41 AM · 5:01 PM |
| Tue Nov 10 | Green flag | Overcast | 67°19° 41°5° | 0% | 21 mph34 km/h WSW | 85°30° | 727 ft222 m | 6:42 AM · 5:00 PM |
| Wed Nov 11 | Green flag | Clear | 65°18° 49°10° | 0% | 10 mph15 km/h ESE | 93°34° | 679 ft207 m | 6:43 AM · 4:59 PM |
| Thu Nov 12 | Yellow flag37% chance of showers | Light drizzle | 61°16° 52°11° | 37% 0.01 in0.3 mm | 22 mph36 km/h SSE | 74°23° | 829 ft253 m | 6:45 AM · 4:58 PM |
| Fri Nov 13 | Yellow flag33% chance of showers | Light drizzle | 55°13° 43°6° | 39% 0.29 in7.3 mm | 27 mph44 km/h W | 64°18° | 666 ft203 m | 6:46 AM · 4:57 PM |
| Sat Nov 14 | Yellow flaggusty wind | Overcast | 48°9° 40°5° | 24% 0.1 in2.6 mm | 27 mph43 km/h WNW | 57°14° | -66 ft-20 m | 6:47 AM · 4:56 PM |
Flags judge the racing hours: 9 am to 10 pm at the track for a drag strip. National Weather Service alerts raise them. Days marked partial are at the edge of the forecast. How the flags work
Every hour, every number
Today’s remaining 10 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 |
|---|---|---|---|---|---|---|---|---|---|---|
| 59°15° | 39°4° | 46% | 29.95 inHg1014 hPa | 255 ft78 m | 1.216 | 35 | 78°26° | 8 mph12 km/h SSW | 0% | |
| 60°16° | 39°4° | 45% | 29.93 inHg1014 hPa | 351 ft107 m | 1.212 | 35 | 74°24° | 8 mph13 km/h SW | 0% | |
| 58°15° | 42°6° | 55% | 29.91 inHg1013 hPa | 240 ft73 m | 1.216 | 40 | 65°19° | 8 mph13 km/h SW | 0% | |
| 55°13° | 44°7° | 66% | 29.93 inHg1013 hPa | 7 ft2 m | 1.225 | 42 | 55°13° | 7 mph12 km/h S | 0% | |
| 54°12° | 45°7° | 73% | 29.92 inHg1013 hPa | -59 ft-18 m | 1.227 | 45 | 54°12° | 9 mph14 km/h S | 0% | |
| 53°12° | 45°7° | 73% | 29.91 inHg1013 hPa | -58 ft-18 m | 1.227 | 45 | 53°12° | 10 mph16 km/h SSW | 0% | |
| 53°12° | 43°6° | 68% | 29.88 inHg1012 hPa | -66 ft-20 m | 1.227 | 41 | 53°12° | 10 mph15 km/h SSW | 0% | |
| 52°11° | 42°5° | 67% | 29.90 inHg1013 hPa | -139 ft-42 m | 1.230 | 39 | 52°11° | 7 mph11 km/h SW | 0% | |
| 51°11° | 39°4° | 64% | 29.91 inHg1013 hPa | -253 ft-77 m | 1.234 | 35 | 51°11° | 5 mph8 km/h W | 0% | |
| 50°10° | 40°4° | 68% | 29.91 inHg1013 hPa | -340 ft-104 m | 1.237 | 36 | 50°10° | 6 mph9 km/h WNW | 0% |
Every hour from the forecast, the same arithmetic as the pit box above (NWS density-altitude formula; track temperature is an estimate). Hours are track time.
Plan the whole week at MIR
Pit box, all week
Every forecast hour for the next seven days at MIR: 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 MIR, and a heads-up three days out.
A year at MIR
Typical for November here: highs around 58°15°, lows 41°5°, rain on 24% of days.
5-year averages from the Open-Meteo archive at the track's coordinates.
Getting to MIR
Mechanicsville, Maryland
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
- Mechanicsville, Maryland
- Layout
- Quarter-mile drag strip
- Length
- Quarter mile (1,320 ft)
- Opened
- 1966
- Series
- NHRA, PDRA
- Signature events
- NHRA Potomac Nationals
- Time zone
- America/New York
- Elevation
- 131 ft (40 m)