Wind on the strip—The strip’s direction is not mapped
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.
This week
Day by day
TodayNov 854°12°37°3° 1%Yellow flag
TomorrowNov 948°9°40°5° 2%Yellow flag
TueNov 1057°14°40°4° 1%Yellow flag
WedNov 1158°14°42°6° 19%Green flag
ThuNov 1248°9°40°4° 79%Red flag
FriNov 1339°4°36°2° 77%Red flag
SatNov 1439°4°37°3° 40%Red flagpartial
Day
Flag
Sky
High / low
Rain
Gusts
Track temp
Density alt.
Sunrise · sunset
Today Nov 8
Yellow flaggusty wind
Overcast
54°12°37°3°
1%
33 mph53 km/h WSW
68°20°
1,230 ft375 m
7:03 AM · 5:12 PM
Tomorrow Nov 9
Yellow flaggusty wind
Overcast
48°9°40°5°
2%
33 mph54 km/h WNW
55°13°
594 ft181 m
7:04 AM · 5:11 PM
Tue Nov 10
Yellow flaggusty wind
Clear
57°14°40°4°
1%
28 mph45 km/h WSW
73°23°
1,346 ft410 m
7:06 AM · 5:10 PM
Wed Nov 11
Green flag
Overcast
58°14°42°6°
19%
14 mph22 km/h SSW
73°23°
1,416 ft432 m
7:07 AM · 5:09 PM
Thu Nov 12
Red flagrain
Rain
48°9°40°4°
79% 0.85 in21.6 mm
39 mph63 km/h NE
50°10°
1,312 ft400 m
7:08 AM · 5:08 PM
Fri Nov 13
Red flagsnow, 53% chance of showers
Snow showers
39°4°36°2°
77% 0.23 in5.8 mm
38 mph60 km/h N
38°3°
481 ft147 m
7:09 AM · 5:07 PM
Sat Nov 14
Red flagsnow, gusty wind
Snow showers
39°4°37°3°
40% 0.15 in3.7 mm
28 mph45 km/h NW
41°5°
419 ft128 m
7:11 AM · 5:06 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
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
54°12°
37°3°
52%
29.85 inHg1011 hPa
1,230 ft375 m
1.181
33
67°19°
17 mph28 km/h WSW · gusts 30 mph48 km/h
1%
54°12°
36°2°
51%
29.86 inHg1011 hPa
1,230 ft375 m
1.181
33
64°18°
16 mph26 km/h WSW · gusts 31 mph49 km/h
0%
52°11°
39°4°
60%
29.85 inHg1011 hPa
1,148 ft350 m
1.184
36
58°15°
16 mph25 km/h W · gusts 33 mph53 km/h
0%
50°10°
43°6°
75%
29.86 inHg1011 hPa
1,025 ft312 m
1.189
42
51°10°
14 mph22 km/h W · gusts 32 mph51 km/h
0%
49°10°
43°6°
80%
29.87 inHg1012 hPa
945 ft288 m
1.192
43
49°10°
13 mph21 km/h W · gusts 30 mph49 km/h
0%
49°10°
42°6°
76%
29.87 inHg1011 hPa
968 ft295 m
1.191
41
49°10°
13 mph22 km/h W · gusts 33 mph53 km/h
1%
49°9°
44°7°
83%
29.86 inHg1011 hPa
930 ft283 m
1.192
44
49°9°
14 mph23 km/h WNW · gusts 33 mph53 km/h
1%
47°9°
42°6°
81%
29.88 inHg1012 hPa
823 ft251 m
1.196
41
47°9°
12 mph20 km/h WNW · gusts 29 mph47 km/h
1%
47°8°
41°5°
81%
29.89 inHg1012 hPa
771 ft235 m
1.198
40
47°8°
11 mph17 km/h WNW · gusts 23 mph36 km/h
1%
47°8°
41°5°
82%
29.88 inHg1012 hPa
764 ft233 m
1.198
40
47°8°
10 mph16 km/h WNW · gusts 22 mph36 km/h
1%
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.
Raceway Weather Pro
Plan the whole week at Thompson
Pit box, all week
Every forecast hour for the next seven days at Thompson: 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 Thompson, and a heads-up three days out.
Typical for November here: highs around 49°9°, lows 35°2°, rain on 44% of days.
Month by month
Average highs and lows, rain days, gusty days, freezing and hot days for all twelve months at Thompson, from 5 years of records. Part of Raceway Weather Pro.
ClearTemperature 49°10°Rain chance 0%Wind 13 mph21 km/hWTrack temperature 49°10°Density altitude 945 ft288 m
OvercastTemperature 47°9°Rain chance 1%Wind 10 mph16 km/hWNWTrack temperature 47°9°Density altitude 814 ft248 m
Partly cloudyTemperature 47°9°Rain chance 0%Wind 10 mph17 km/hWNWTrack temperature 47°9°Density altitude 799 ft244 m
Partly cloudyTemperature 44°7°Rain chance 1%Wind 15 mph24 km/hNWTrack temperature 46°8°Density altitude 425 ft130 m
OvercastTemperature 47°9°Rain chance 1%Wind 15 mph24 km/hNWTrack temperature 54°12°Density altitude 575 ft175 m
48°9° 40°4° 79%Red flag
39°4° 36°2° 77%Red flag