Heat Advisory — Western Roosevelt, MT, McCone, MT, Richland, MT, Dawson, MT, Prairie, MT, Wibaux, MT, Eastern Roosevelt, MT 8:00 PM Fire Weather Watch 10:00 PM

Shelby, Montana

Last updated: 6:22 PM CDT  ·  Refresh
31°C
Feels like 29°
Mostly Clear
▲ 33°  /  ▼ 13°
Wind
5 mph W
Humidity
20%
Dew Point
6°
Pressure
26.42 inHg
Visibility
8 mi
UV Index
6.7
Cloud Cover
23%
Sunrise
5:58 AM
Sunset
9:08 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Shelby is currently mostly clear at 31°C. Dry conditions are expected through the next 24 hours. Sunrise: 5:58AM · Sunset: 9:08PM.

Alerts

Heat Advisory
Western Roosevelt, MT, McCone, MT, Richland, MT, Dawson, MT, Prairie, MT, Wibaux, MT, Eastern Roosevelt, MT
Expires 8:00 PM
Fire Weather Watch
Expires 10:00 PM
81 AQI · Moderate Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
31°
3%
6 PM
33°
3%
7 PM
31°
3%
8 PM
29°
3%
9 PM
27°
3%
10 PM
23°
3%
11 PM
22°
3%
12 AM
21°
3%
1 AM
20°
3%
2 AM
18°
3%
3 AM
17°
3%
4 AM
16°
3%
5 AM
16°
3%
6 AM
13°
3%
7 AM
15°
3%
8 AM
17°
3%
9 AM
19°
3%
10 AM
23°
3%
11 AM
26°
3%
12 PM
28°
3%
1 PM
29°
3%
2 PM
32°
3%
3 PM
32°
3%
4 PM
33°
3%
7-Day Forecast
Today
33° 13°
Mostly Clear.
Thu
35° 13°
Mostly Clear.
Fri
34° 13°
Clear.
Sat
38° 13°
Mostly Clear.
Sun
28° 10°
Clear.
Mon
22° 6°
Clear.
Tue
26° 6°
Clear.
TimeTempConditionsPrecipWindHumidity
Now 31° Mostly Clear 3% 5 mph W 20%
6 PM 33° Mostly Clear 3% 6 mph NW 21%
7 PM 31° Mostly Clear 3% 5 mph NW 24%
8 PM 29° Clear 3% 4 mph NNW 28%
9 PM 27° Clear 3% 4 mph NNW 31%
10 PM 23° Clear 3% 4 mph NNE 33%
11 PM 22° Clear 3% 4 mph ENE 35%
12 AM 21° Clear 3% 4 mph ENE 38%
1 AM 20° Clear 3% 4 mph NNE 41%
2 AM 18° Clear 3% 3 mph NNW 45%
3 AM 17° Clear 3% 3 mph NW 48%
4 AM 16° Mostly Clear 3% 4 mph NW 50%
5 AM 16° Mostly Clear 3% 4 mph NW 52%
6 AM 13° Mostly Clear 3% 4 mph NW 52%
7 AM 15° Mostly Clear 3% 3 mph NW 46%
8 AM 17° Mostly Clear 3% 3 mph WNW 40%
9 AM 19° Mostly Clear 3% 3 mph W 34%
10 AM 23° Clear 3% 4 mph WNW 29%
11 AM 26° Clear 3% 4 mph WNW 25%
12 PM 28° Clear 3% 5 mph WNW 21%
1 PM 29° Clear 3% 5 mph W 19%
2 PM 32° Clear 3% 5 mph W 18%
3 PM 32° Mostly Clear 3% 6 mph W 17%
4 PM 33° Mostly Clear 3% 7 mph W 17%
15-Day Forecast
Today
7/29
Mostly Clear
3%
13°
33°
Thu
7/30
Mostly Clear
3%
13°
35°
Fri
7/31
Clear
3%
13°
34°
Sat
8/1
Mostly Clear
3%
13°
38°
Sun
8/2
Clear
3%
10°
28°
Mon
8/3
Clear
15%
6°
22°
Tue
8/4
Clear
3%
6°
26°
Wed
8/5
Clear
3%
9°
31°
Thu
8/6
Partly Cloudy
20%
11°
31°
Fri
8/7
Rain
54%
12°
33°
Sat
8/8
Drizzle
45%
11°
28°
Sun
8/9
Clear
25%
14°
30°
Mon
8/10
Clear
25%
15°
32°
Tue
8/11
Clear
25%
16°
32°
Wed
8/12
Clear
60%
16°
33°
81
Moderate
U.S. Air Quality Index · Dominant: PM2.5
50 100 150 200

Air quality is acceptable. Unusually sensitive people should consider limiting prolonged outdoor exertion.

Pollutant Breakdown · Today
PM2.5
Fine particulate matter
Dominant
81 AQI 25.2 µg/m³
O3
Ground-level ozone
50 AQI 54 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Thu 81 Moderate 50 81
Fri 87 Moderate 45 87
Sat 69 Moderate 39 69
About the Air Quality Index
0–50 Good
51–100 Moderate
101–150 Unhealthy for Sensitive Groups
151–200 Unhealthy
201–300 Very Unhealthy
301–500 Hazardous

The U.S. AQI runs 0–500. The overall value equals the highest individual pollutant sub-index, and the dominant pollutant is the one driving it. PM2.5 (fine particles) is reported in µg/m³ and ozone (O3) in ppb. Forecast source: NWS NAQFC.

1000850700500400300250200150100 -40-30-20-10010203040 0.41247101624 LCLLFCEL0°C Temperature (°C) Pressure (hPa)
Temp Dewpoint Parcel (SB) CAPE CIN Dry adiabat Moist adiabat Mixing ratio
RAP
Valid Wed Jul 29, 22:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 50 60 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE266 J/kg
MLCAPE73 J/kg
MUCAPE266 J/kg
SBCIN0 J/kg
MLCIN0 J/kg
Lifted Index-0.2
Kinematics
0–6 km Shear31 kt
0–1 km Shear2 kt
Eff. Shear34 kt
0–1 km SRH-6
0–3 km SRH-71
Eff. SRH-71
Storm Motion216° @ 25 kt
0–1 km EHI-0.0
Composite Parameters
Sig. Tornado-0.0
STP (eff)0.0
Supercell0.0
K-Index31.7
Thermo & Levels
PWAT0.85 in
0–3 km LR9.6 °C/km
700–500 LR7.1 °C/km
Total Totals49.2
LCL619 hPa
LFC895 hPa
EL258 hPa
Freezing Lvl10,942 ft