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 845°7°35°2° 53%Yellow flag
TomorrowNov 949°9°34°1° 16%Yellow flag
TueNov 1046°8°32°0° 18%Green flag
WedNov 1145°7°34°1° 11%Yellow flag
ThuNov 1246°8°30°-1° 10%Yellow flag
FriNov 1345°7°32°0° 49%Red flag
SatNov 1451°10°44°7° 44%Red flagpartial
Day
Flag
Sky
High / low
Rain
Gusts
Track temp
Density alt.
Sunrise · sunset
Today Nov 8
Yellow flag37% chance of showers
Overcast
45°7°35°2°
53% 0.02 in0.4 mm
28 mph45 km/h NW
48°9°
-208 ft-63 m
6:21 AM · 4:17 PM
Tomorrow Nov 9
Yellow flagcold
Overcast
49°9°34°1°
16% 0.03 in0.8 mm
22 mph35 km/h W
58°14°
28 ft9 m
6:23 AM · 4:15 PM
Tue Nov 10
Green flag
Drizzle
46°8°32°0°
18% 0.03 in0.7 mm
24 mph39 km/h WSW
56°13°
-387 ft-118 m
6:24 AM · 4:14 PM
Wed Nov 11
Yellow flagcold
Overcast
45°7°34°1°
11% 0.02 in0.5 mm
23 mph37 km/h WNW
56°13°
-524 ft-160 m
6:26 AM · 4:13 PM
Thu Nov 12
Yellow flagcold
Overcast
46°8°30°-1°
10%
19 mph31 km/h NW
60°16°
-532 ft-162 m
6:27 AM · 4:12 PM
Fri Nov 13
Red flagrain, gusty wind
Rain
45°7°32°0°
49% 0.96 in24.3 mm
40 mph65 km/h ENE
42°6°
-194 ft-59 m
6:28 AM · 4:11 PM
Sat Nov 14
Red flagrain, gusty wind
Showers
51°10°44°7°
44% 0.75 in19.1 mm
37 mph59 km/h NE
55°13°
545 ft166 m
6:30 AM · 4:10 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
45°7°
37°3°
74%
29.54 inHg1001 hPa
-208 ft-63 m
1.232
33
48°9°
12 mph19 km/h WNW · gusts 27 mph44 km/h
30%
43°6°
36°2°
75%
29.56 inHg1001 hPa
-357 ft-109 m
1.238
31
44°7°
11 mph18 km/h WNW · gusts 28 mph45 km/h
23%
42°6°
35°2°
76%
29.57 inHg1001 hPa
-430 ft-131 m
1.240
30
43°6°
9 mph14 km/h WNW · gusts 26 mph41 km/h
21%
40°5°
35°2°
81%
29.58 inHg1002 hPa
-565 ft-172 m
1.245
30
40°5°
5 mph8 km/h WNW · gusts 15 mph23 km/h
8%
40°4°
35°2°
83%
29.61 inHg1003 hPa
-633 ft-193 m
1.248
30
40°4°
5 mph9 km/h W · gusts 14 mph23 km/h
5%
40°4°
34°1°
81%
29.59 inHg1002 hPa
-630 ft-192 m
1.248
29
40°4°
5 mph9 km/h W · gusts 15 mph25 km/h
3%
38°3°
34°1°
84%
29.60 inHg1002 hPa
-751 ft-229 m
1.252
29
38°3°
5 mph8 km/h WSW
2%
37°3°
34°1°
90%
29.61 inHg1003 hPa
-844 ft-257 m
1.256
29
37°3°
5 mph7 km/h WSW
1%
36°2°
33°0°
89%
29.60 inHg1002 hPa
-912 ft-278 m
1.258
28
36°2°
5 mph8 km/h WSW
1%
35°2°
32°0°
88%
29.60 inHg1002 hPa
-927 ft-283 m
1.259
27
35°2°
5 mph9 km/h WSW
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 Winterport
Pit box, all week
Every forecast hour for the next seven days at Winterport: 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 Winterport, and a heads-up three days out.
Typical for November here: highs around 46°8°, lows 31°0°, rain on 31% of days.
Month by month
Average highs and lows, rain days, gusty days, freezing and hot days for all twelve months at Winterport, from 5 years of records. Part of Raceway Weather Pro.
Mostly clearTemperature 40°5°Rain chance 8%Wind 5 mph8 km/hWNWTrack temperature 40°5°Density altitude -565 ft-172 m
OvercastTemperature 40°4°Rain chance 5%Wind 5 mph9 km/hWTrack temperature 40°4°Density altitude -633 ft-193 m
Light drizzleTemperature 37°3°Rain chance 14%Wind 5 mph7 km/hSWTrack temperature 37°3°Density altitude -825 ft-251 m
45°7° 32°0° 49%Red flag