Heat Advisory — Greene, IL, Macoupin, IL, Montgomery, IL, Fayette, IL, Calhoun, IL, Jersey, IL, Boone, MO, Callaway, MO, Montgomery, MO, Lincoln, MO 8:00 PM

Boone County, Missouri, United States

Last updated: 6:42 AM CDT  ·  Refresh
23°C
Feels like 26°
Mostly Clear
▲ 36°  /  ▼ 23°
Wind
5 mph E
Humidity
94%
Dew Point
22°
Pressure
29.35 inHg
Visibility
8 mi
UV Index
0.0
Cloud Cover
17%
Sunrise
6:53 AM
Sunset
7:12 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Boone County is currently mostly clear at 23°C. Dry conditions are expected through the next 24 hours. Atmospheric instability is elevated (CAPE up to 1942 J/kg) — isolated convective development possible. Sunrise: 6:53AM · Sunset: 7:12PM.

Alerts

Heat Advisory
Greene, IL, Macoupin, IL, Montgomery, IL, Fayette, IL, Calhoun, IL, Jersey, IL, Boone, MO, Callaway, MO, Montgomery, MO, Lincoln, MO
Expires 8:00 PM
52 AQI · Moderate Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
23°
15%
7 AM
23°
31%
8 AM
24°
31%
9 AM
27°
31%
10 AM
29°
24%
11 AM
31°
21%
12 PM
33°
14%
1 PM
35°
15%
2 PM
35°
18%
3 PM
36°
18%
4 PM
35°
21%
5 PM
35°
21%
6 PM
33°
21%
7 PM
32°
22%
8 PM
31°
22%
9 PM
28°
23%
10 PM
28°
23%
11 PM
27°
27%
12 AM
27°
19%
1 AM
26°
17%
2 AM
26°
14%
3 AM
25°
14%
4 AM
25°
5%
5 AM
23°
5%
7-Day Forecast
Today
36° 23°
Clear with a 31% chance of rain.
Sat
37° 23°
Mostly Cloudy with a 32% chance of rain.
Sun
32° 19°
Overcast with a 79% chance of rain.
Mon
25° 16°
Overcast with a 80% chance of rain.
Tue
24° 11°
Partly Cloudy.
Wed
27° 11°
Mostly Clear.
Thu
26° 12°
Partly Cloudy.
TimeTempConditionsPrecipWindHumidity
Now 23° Mostly Clear 15% 5 mph E 94%
7 AM 23° Clear 31% 5 mph E 88%
8 AM 24° Clear 31% 5 mph ESE 81%
9 AM 27° Clear 31% 4 mph SE 74%
10 AM 29° Clear 24% 4 mph SSE 64%
11 AM 31° Clear 21% 5 mph S 57%
12 PM 33° Clear 14% 5 mph SSW 50%
1 PM 35° Clear 15% 5 mph SSW 47%
2 PM 35° Mostly Clear 18% 5 mph SSW 45%
3 PM 36° Mostly Clear 18% 5 mph SSW 44%
4 PM 35° Mostly Clear 21% 4 mph SSW 45%
5 PM 35° Mostly Clear 21% 3 mph S 48%
6 PM 33° Mostly Clear 21% 4 mph SE 53%
7 PM 32° Mostly Clear 22% 4 mph SE 57%
8 PM 31° Mostly Clear 22% 4 mph SE 61%
9 PM 28° Mostly Clear 23% 5 mph SE 64%
10 PM 28° Mostly Clear 23% 6 mph SE 66%
11 PM 27° Mostly Clear 27% 6 mph SE 68%
12 AM 27° Mostly Clear 19% 7 mph SSE 70%
1 AM 26° Partly Cloudy 17% 7 mph SSE 71%
2 AM 26° Partly Cloudy 14% 7 mph SSE 72%
3 AM 25° Partly Cloudy 14% 7 mph SSE 73%
4 AM 25° Partly Cloudy 5% 7 mph SSE 73%
5 AM 23° Partly Cloudy 5% 7 mph S 72%
15-Day Forecast
Today
9/18
Clear
31%
23°
36°
Sat
9/19
Mostly Cloudy
32%
23°
37°
Sun
9/20
Overcast
79%
19°
32°
Mon
9/21
Overcast
80%
16°
25°
Tue
9/22
Partly Cloudy
18%
11°
24°
Wed
9/23
Mostly Clear
3%
11°
27°
Thu
9/24
Partly Cloudy
15%
12°
26°
Fri
9/25
Overcast
36%
13°
25°
Sat
9/26
Overcast
35%
13°
27°
Sun
9/27
Mostly Clear
54%
14°
27°
Mon
9/28
Drizzle
60%
16°
30°
Tue
9/29
Drizzle
60%
16°
29°
Wed
9/30
Drizzle
60%
15°
29°
Thu
10/1
Clear
60%
14°
29°
Fri
10/2
Drizzle
60%
13°
27°
52
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
52 AQI 9.5 µg/m³
O3
Ground-level ozone
45 AQI 49 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Sat 52 Moderate 45 52
Sun 53 Moderate 45 53
Mon 42 Good 42 32
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 Fri Sep 18, 10:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE446 J/kg
MLCAPE451 J/kg
MUCAPE874 J/kg
SBCIN-369 J/kg
MLCIN-261 J/kg
Lifted Index-2.0
Kinematics
0–6 km Shear21 kt
0–1 km Shear13 kt
Eff. Shear19 kt
0–1 km SRH57
0–3 km SRH48
Eff. SRH29
Storm Motion325° @ 14 kt
0–1 km EHI0.2
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index33.4
Thermo & Levels
PWAT1.68 in
0–3 km LR4.4 °C/km
700–500 LR5.9 °C/km
Total Totals49.0
LCL979 hPa
LFC696 hPa
EL243 hPa
Freezing Lvl14,518 ft