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: 7:45 AM CDT  ·  Refresh
23°C
Feels like 27°
Mostly Clear
▲ 36°  /  ▼ 23°
Wind
4 mph E
Humidity
90%
Dew Point
22°
Pressure
29.34 inHg
Visibility
7 mi
UV Index
2.4
Cloud Cover
19%
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 2110 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%
8 AM
25°
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
34°
20%
5 PM
35°
21%
6 PM
33°
21%
7 PM
32°
21%
8 PM
31°
22%
9 PM
28°
22%
10 PM
27°
25%
11 PM
27°
36%
12 AM
27°
19%
1 AM
26°
17%
2 AM
25°
14%
3 AM
25°
14%
4 AM
24°
5%
5 AM
23°
5%
6 AM
23°
3%
7-Day Forecast
Today
36° 23°
Mostly Clear with a 25% chance of rain.
Sat
37° 23°
Mostly Cloudy with a 40% 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°
Mostly Cloudy.
TimeTempConditionsPrecipWindHumidity
Now 23° Mostly Clear 15% 4 mph E 90%
8 AM 25° Clear 31% 5 mph ESE 80%
9 AM 27° Clear 31% 5 mph SE 72%
10 AM 29° Clear 24% 4 mph SSE 63%
11 AM 31° Clear 21% 4 mph SSW 56%
12 PM 33° Clear 14% 4 mph SSW 49%
1 PM 35° Clear 15% 5 mph SW 46%
2 PM 35° Mostly Clear 18% 5 mph SW 45%
3 PM 36° Mostly Clear 18% 4 mph SW 44%
4 PM 34° Mostly Clear 20% 4 mph SSW 46%
5 PM 35° Mostly Clear 21% 3 mph S 49%
6 PM 33° Mostly Clear 21% 4 mph SE 54%
7 PM 32° Mostly Clear 21% 4 mph SE 58%
8 PM 31° Mostly Clear 22% 4 mph SE 61%
9 PM 28° Partly Cloudy 22% 5 mph SE 64%
10 PM 27° Mostly Clear 25% 5 mph SSE 67%
11 PM 27° Mostly Clear 36% 6 mph SSE 69%
12 AM 27° Mostly Clear 19% 6 mph SSE 71%
1 AM 26° Mostly Clear 17% 6 mph SSE 72%
2 AM 25° Partly Cloudy 14% 6 mph S 74%
3 AM 25° Partly Cloudy 14% 6 mph S 75%
4 AM 24° Partly Cloudy 5% 6 mph S 75%
5 AM 23° Partly Cloudy 5% 6 mph S 74%
6 AM 23° Partly Cloudy 3% 6 mph S 73%
15-Day Forecast
Today
9/18
Mostly Clear
25%
23°
36°
Sat
9/19
Mostly Cloudy
40%
23°
37°
Sun
9/20
Overcast
79%
19°
32°
Mon
9/21
Overcast
80%
16°
25°
Tue
9/22
Partly Cloudy
14%
11°
24°
Wed
9/23
Mostly Clear
3%
11°
27°
Thu
9/24
Mostly Cloudy
15%
12°
26°
Fri
9/25
Overcast
36%
13°
25°
Sat
9/26
Mostly Cloudy
35%
13°
27°
Sun
9/27
Drizzle
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
Drizzle
60%
15°
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, 11:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE653 J/kg
MLCAPE662 J/kg
MUCAPE972 J/kg
SBCIN-320 J/kg
MLCIN-232 J/kg
Lifted Index-2.4
Kinematics
0–6 km Shear21 kt
0–1 km Shear12 kt
Eff. Shear20 kt
0–1 km SRH56
0–3 km SRH45
Eff. SRH29
Storm Motion324° @ 14 kt
0–1 km EHI0.2
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.3
K-Index34.9
Thermo & Levels
PWAT1.74 in
0–3 km LR4.7 °C/km
700–500 LR5.8 °C/km
Total Totals48.8
LCL970 hPa
LFC717 hPa
EL218 hPa
Freezing Lvl14,672 ft