Excessive Heat Watch 8:00 PM

Johnson County, Missouri, United States

Last updated: 4:35 AM CDT  ·  Refresh
20°C
Feels like 21°
Mostly Clear
▲ 32°  /  ▼ 22°
Wind
5 mph SSW
Humidity
94%
Dew Point
19°
Pressure
29.21 inHg
Visibility
10 mi
UV Index
0.0
Cloud Cover
14%
Sunrise
6:23 AM
Sunset
8:18 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Johnson County is currently mostly clear at 20°C. Dry conditions are expected through the next 24 hours. Atmospheric instability is elevated (CAPE up to 2683 J/kg) — isolated convective development possible. Sunrise: 6:23AM · Sunset: 8:18PM.

Alerts

Excessive Heat Watch
Expires 8:00 PM
50 AQI · Good Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
20°
6%
5 AM
18°
23%
6 AM
18°
25%
7 AM
19°
27%
8 AM
21°
21%
9 AM
22°
21%
10 AM
23°
15%
11 AM
25°
15%
12 PM
27°
15%
1 PM
30°
3%
2 PM
31°
3%
3 PM
31°
3%
4 PM
31°
3%
5 PM
32°
3%
6 PM
32°
3%
7 PM
30°
3%
8 PM
28°
8%
9 PM
26°
8%
10 PM
26°
20%
11 PM
26°
21%
12 AM
26°
21%
1 AM
26°
21%
2 AM
25°
22%
3 AM
25°
22%
7-Day Forecast
Today
32° 22°
Clear with a 27% chance of rain.
Sun
37° 22°
Partly Cloudy.
Mon
37° 24°
Clear.
Tue
37° 24°
Partly Cloudy with a 52% chance of rain.
Wed
37° 21°
Drizzle, 64% chance.
Thu
30° 19°
Heavy Rain, 82% chance.
Fri
27° 17°
Rain, 82% chance.
TimeTempConditionsPrecipWindHumidity
Now 20° Mostly Clear 6% 5 mph SSW 94%
5 AM 18° Clear 23% 6 mph SSW 91%
6 AM 18° Mostly Clear 25% 5 mph SSW 90%
7 AM 19° Mostly Clear 27% 4 mph SW 88%
8 AM 21° Mostly Clear 21% 4 mph SW 84%
9 AM 22° Mostly Clear 21% 3 mph WSW 79%
10 AM 23° Mostly Clear 15% 3 mph SSW 75%
11 AM 25° Mostly Clear 15% 3 mph SE 69%
12 PM 27° Clear 15% 4 mph SE 63%
1 PM 30° Clear 3% 4 mph SE 59%
2 PM 31° Clear 3% 5 mph SE 56%
3 PM 31° Clear 3% 6 mph SE 54%
4 PM 31° Clear 3% 7 mph SE 55%
5 PM 32° Clear 3% 7 mph SE 58%
6 PM 32° Clear 3% 6 mph SE 62%
7 PM 30° Clear 3% 6 mph SE 67%
8 PM 28° Clear 8% 6 mph SE 71%
9 PM 26° Clear 8% 6 mph SE 75%
10 PM 26° Clear 20% 6 mph SE 76%
11 PM 26° Clear 21% 7 mph SSE 76%
12 AM 26° Mostly Clear 21% 9 mph SSE 76%
1 AM 26° Mostly Clear 21% 9 mph SSE 77%
2 AM 25° Mostly Clear 22% 9 mph S 78%
3 AM 25° Clear 22% 10 mph S 79%
15-Day Forecast
Today
8/8
Clear
27%
22°
32°
Sun
8/9
Partly Cloudy
18%
22°
37°
Mon
8/10
Clear
13%
24°
37°
Tue
8/11
Partly Cloudy
52%
24°
37°
Wed
8/12
Drizzle
64%
21°
37°
Thu
8/13
Heavy Rain
82%
19°
30°
Fri
8/14
Rain
82%
17°
27°
Sat
8/15
Rain
82%
16°
27°
Sun
8/16
Drizzle
68%
16°
29°
Mon
8/17
Clear
68%
18°
31°
Tue
8/18
Drizzle
60%
21°
34°
Wed
8/19
Drizzle
60%
22°
34°
Thu
8/20
Drizzle
60%
22°
34°
Fri
8/21
Drizzle
60%
21°
34°
Sat
8/22
Clear
60%
21°
33°
50
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
50 AQI 9.0 µg/m³
O3
Ground-level ozone
34 AQI 37 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Today 50 Good 34 50
Sun 46 Good 36 46
Mon 53 Moderate 36 53
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 Sat Aug 8, 08:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE31 J/kg
MLCAPE224 J/kg
MUCAPE492 J/kg
SBCIN-849 J/kg
MLCIN0 J/kg
Lifted Index-0.3
Kinematics
0–6 km Shear35 kt
0–1 km Shear5 kt
Eff. Shear—
0–1 km SRH29
0–3 km SRH-51
Eff. SRH—
Storm Motion301° @ 22 kt
0–1 km EHI0.0
Composite Parameters
Sig. Tornado0.0
STP (eff)—
Supercell—
K-Index16.3
Thermo & Levels
PWAT1.13 in
0–3 km LR2.9 °C/km
700–500 LR7.8 °C/km
Total Totals42.8
LCL973 hPa
LFC509 hPa
EL426 hPa
Freezing Lvl14,524 ft