Excessive Heat Warning — Knox, MO, Lewis, MO, Shelby, MO, Marion, MO, Monroe, MO, Ralls, MO, Pike, MO, Boone, MO, Audrain, MO, Moniteau, MO, Cole, MO, Osage, MO, Callaway, MO, Montgomery, MO, Lincoln, MO, Gasconade, MO, Warren, MO, Franklin, MO, Crawford, MO, Washington, MO, St. Francois, MO, Ste. Genevieve, MO, Iron, MO, Madison, MO, Reynolds, MO, St. Charles, MO, St. Louis, MO, St. Louis City, MO, Jefferson, MO 9:00 PM Heat Advisory — Bond, IL, Clinton, IL, Marion, IL, Boone, MO, Moniteau, MO, Cole, MO, Osage, MO, Callaway, MO, Montgomery, MO, Lincoln, MO, Gasconade, MO, Warren, MO, Franklin, MO 7:00 PM Excessive Heat Watch 7:00 PM

Boone County, Missouri, United States

Last updated: 1:31 PM CDT  ·  Refresh
34°C
Feels like 38°
Clear
▲ 37°  /  ▼ 24°
Wind
12 mph SW
Humidity
46%
Dew Point
23°
Pressure
29.04 inHg
Visibility
10 mi
UV Index
9.6
Cloud Cover
0%
Sunrise
6:05 AM
Sunset
8:25 PM
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WeatherAI™ Analysis

WeatherAI Analysis: Boone County is currently clear at 35°C. Dry conditions are expected through the next 24 hours. Atmospheric instability is elevated (CAPE up to 2660 J/kg) — isolated convective development possible. Sunrise: 6:05AM · Sunset: 8:25PM.

Alerts

Excessive Heat Warning
Knox, MO, Lewis, MO, Shelby, MO, Marion, MO, Monroe, MO, Ralls, MO, Pike, MO, Boone, MO, Audrain, MO, Moniteau, MO, Cole, MO, Osage, MO, Callaway, MO, Montgomery, MO, Lincoln, MO, Gasconade, MO, Warren, MO, Franklin, MO, Crawford, MO, Washington, MO, St. Francois, MO, Ste. Genevieve, MO, Iron, MO, Madison, MO, Reynolds, MO, St. Charles, MO, St. Louis, MO, St. Louis City, MO, Jefferson, MO
Expires 9:00 PM
Heat Advisory
Bond, IL, Clinton, IL, Marion, IL, Boone, MO, Moniteau, MO, Cole, MO, Osage, MO, Callaway, MO, Montgomery, MO, Lincoln, MO, Gasconade, MO, Warren, MO, Franklin, MO
Expires 7:00 PM
Excessive Heat Watch
Expires 7:00 PM
47 AQI · Good Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
34°
3%
2 PM
37°
3%
3 PM
37°
3%
4 PM
37°
3%
5 PM
37°
3%
6 PM
36°
3%
7 PM
34°
4%
8 PM
33°
7%
9 PM
31°
8%
10 PM
30°
16%
11 PM
29°
16%
12 AM
29°
17%
1 AM
28°
17%
2 AM
27°
17%
3 AM
26°
17%
4 AM
26°
8%
5 AM
24°
9%
6 AM
24°
9%
7 AM
25°
9%
8 AM
27°
9%
9 AM
28°
9%
10 AM
29°
19%
11 AM
31°
21%
12 PM
32°
27%
7-Day Forecast
Today
37° 24°
Clear.
Tue
36° 23°
Partly Cloudy with a 27% chance of rain.
Wed
33° 21°
Clear.
Thu
33° 20°
Partly Cloudy with a 65% chance of rain.
Fri
31° 20°
Heavy Rain, 82% chance.
Sat
31° 20°
Rain, 21% chance.
Sun
33° 20°
Clear.
TimeTempConditionsPrecipWindHumidity
Now 34° Clear 3% 12 mph SW 46%
2 PM 37° Clear 3% 12 mph SW 42%
3 PM 37° Clear 3% 11 mph SW 40%
4 PM 37° Clear 3% 11 mph WSW 42%
5 PM 37° Clear 3% 9 mph WSW 47%
6 PM 36° Clear 3% 8 mph WSW 52%
7 PM 34° Clear 4% 6 mph WSW 57%
8 PM 33° Clear 7% 6 mph WSW 62%
9 PM 31° Mostly Clear 8% 6 mph WSW 65%
10 PM 30° Mostly Clear 16% 6 mph WSW 67%
11 PM 29° Clear 16% 6 mph WSW 68%
12 AM 29° Clear 17% 5 mph WSW 68%
1 AM 28° Clear 17% 5 mph WSW 69%
2 AM 27° Mostly Clear 17% 5 mph WSW 71%
3 AM 26° Mostly Clear 17% 4 mph WSW 73%
4 AM 26° Mostly Clear 8% 4 mph WSW 74%
5 AM 24° Mostly Clear 9% 4 mph W 76%
6 AM 24° Mostly Clear 9% 3 mph W 78%
7 AM 25° Mostly Clear 9% 3 mph W 76%
8 AM 27° Mostly Clear 9% 4 mph W 72%
9 AM 28° Mostly Clear 9% 4 mph W 67%
10 AM 29° Mostly Clear 19% 5 mph NW 64%
11 AM 31° Partly Cloudy 21% 5 mph N 63%
12 PM 32° Partly Cloudy 27% 7 mph NNE 60%
15-Day Forecast
Today
7/27
Clear
16%
24°
37°
Tue
7/28
Partly Cloudy
27%
23°
36°
Wed
7/29
Clear
12%
21°
33°
Thu
7/30
Partly Cloudy
65%
20°
33°
Fri
7/31
Heavy Rain
82%
20°
31°
Sat
8/1
Rain
21%
20°
31°
Sun
8/2
Clear
17%
20°
33°
Mon
8/3
Drizzle
42%
21°
34°
Tue
8/4
Drizzle
44%
21°
36°
Wed
8/5
Drizzle
51%
23°
36°
Thu
8/6
Drizzle
60%
22°
36°
Fri
8/7
Drizzle
60%
22°
36°
Sat
8/8
Drizzle
60%
23°
36°
Sun
8/9
Drizzle
60%
22°
36°
Mon
8/10
Drizzle
90%
23°
36°
47
Good
U.S. Air Quality Index · Dominant: PM2.5
50 100 150 200

Air quality is satisfactory and poses little or no health risk.

Pollutant Breakdown · Today
PM2.5
Fine particulate matter
Dominant
47 AQI 8.4 µg/m³
O3
Ground-level ozone
35 AQI 39 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Tue 47 Good 35 47
Wed 39 Good 39 37
Thu 55 Moderate 45 55
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 Mon Jul 27, 15:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 50 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE2591 J/kg
MLCAPE1677 J/kg
MUCAPE2591 J/kg
SBCIN0 J/kg
MLCIN0 J/kg
Lifted Index-4.8
Kinematics
0–6 km Shear24 kt
0–1 km Shear12 kt
Eff. Shear27 kt
0–1 km SRH64
0–3 km SRH-2
Eff. SRH-2
Storm Motion278° @ 27 kt
0–1 km EHI1.0
Composite Parameters
Sig. Tornado0.2
STP (eff)0.0
Supercell0.0
K-Index26.1
Thermo & Levels
PWAT1.73 in
0–3 km LR6.8 °C/km
700–500 LR6.4 °C/km
Total Totals45.7
LCL826 hPa
LFC983 hPa
EL149 hPa
Freezing Lvl16,460 ft