Excessive Heat Watch 8:00 PM

Johnson County, Missouri, United States

Last updated: 3:49 AM CDT  ·  Refresh
21°C
Feels like 22°
Clear
▲ 32°  /  ▼ 22°
Wind
6 mph SSW
Humidity
93%
Dew Point
19°
Pressure
29.19 inHg
Visibility
9 mi
UV Index
0.0
Cloud Cover
6%
Sunrise
6:23 AM
Sunset
8:18 PM
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WeatherAI™ Analysis

WeatherAI Analysis: Johnson County is currently clear at 20°C. Dry conditions are expected through the next 24 hours. Atmospheric instability is elevated (CAPE up to 2662 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
21°
3%
4 AM
20°
3%
5 AM
18°
7%
6 AM
18°
9%
7 AM
19°
11%
8 AM
21°
6%
9 AM
22°
6%
10 AM
23°
6%
11 AM
26°
6%
12 PM
27°
6%
1 PM
29°
6%
2 PM
31°
7%
3 PM
31°
7%
4 PM
31°
7%
5 PM
32°
3%
6 PM
31°
3%
7 PM
30°
8%
8 PM
29°
8%
9 PM
27°
9%
10 PM
26°
21%
11 PM
26°
21%
12 AM
26°
21%
1 AM
26°
22%
2 AM
26°
22%
7-Day Forecast
Today
32° 22°
Mostly Clear.
Sun
37° 22°
Mostly Clear with a 25% chance of rain.
Mon
38° 24°
Partly Cloudy with a 22% chance of rain.
Tue
36° 24°
Mostly Clear with a 53% chance of rain.
Wed
37° 21°
Drizzle, 51% chance.
Thu
30° 19°
Rain, 82% chance.
Fri
27° 17°
Rain, 82% chance.
TimeTempConditionsPrecipWindHumidity
Now 21° Clear 3% 6 mph SSW 93%
4 AM 20° Clear 3% 7 mph SSW 91%
5 AM 18° Clear 7% 6 mph SSW 91%
6 AM 18° Mostly Clear 9% 5 mph SSW 91%
7 AM 19° Mostly Clear 11% 4 mph SW 88%
8 AM 21° Partly Cloudy 6% 4 mph SW 84%
9 AM 22° Partly Cloudy 6% 3 mph WSW 80%
10 AM 23° Mostly Clear 6% 2 mph SSW 75%
11 AM 26° Mostly Clear 6% 3 mph SE 70%
12 PM 27° Clear 6% 3 mph SE 65%
1 PM 29° Mostly Clear 6% 4 mph SE 61%
2 PM 31° Mostly Clear 7% 5 mph SE 58%
3 PM 31° Mostly Clear 7% 6 mph SE 55%
4 PM 31° Mostly Clear 7% 7 mph SE 57%
5 PM 32° Mostly Clear 3% 7 mph SE 60%
6 PM 31° Mostly Clear 3% 6 mph SE 64%
7 PM 30° Mostly Clear 8% 6 mph SE 67%
8 PM 29° Mostly Clear 8% 6 mph SE 70%
9 PM 27° Mostly Clear 9% 6 mph SSE 73%
10 PM 26° Mostly Clear 21% 7 mph SSE 73%
11 PM 26° Partly Cloudy 21% 8 mph SSE 73%
12 AM 26° Partly Cloudy 21% 9 mph SSE 73%
1 AM 26° Partly Cloudy 22% 10 mph S 74%
2 AM 26° Partly Cloudy 22% 10 mph S 75%
15-Day Forecast
Today
8/8
Mostly Clear
9%
22°
32°
Sun
8/9
Mostly Clear
25%
22°
37°
Mon
8/10
Partly Cloudy
22%
24°
38°
Tue
8/11
Mostly Clear
53%
24°
36°
Wed
8/12
Drizzle
51%
21°
37°
Thu
8/13
Rain
82%
19°
30°
Fri
8/14
Rain
82%
17°
27°
Sat
8/15
Rain
82%
16°
27°
Sun
8/16
Drizzle
44%
16°
29°
Mon
8/17
Rain
68%
18°
31°
Tue
8/18
Drizzle
60%
21°
34°
Wed
8/19
Drizzle
60%
22°
34°
Thu
8/20
Drizzle
60%
22°
35°
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, 07:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE80 J/kg
MLCAPE187 J/kg
MUCAPE385 J/kg
SBCIN-754 J/kg
MLCIN0 J/kg
Lifted Index-1.1
Kinematics
0–6 km Shear38 kt
0–1 km Shear3 kt
Eff. Shear—
0–1 km SRH19
0–3 km SRH-81
Eff. SRH—
Storm Motion298° @ 20 kt
0–1 km EHI0.0
Composite Parameters
Sig. Tornado0.0
STP (eff)—
Supercell—
K-Index11.5
Thermo & Levels
PWAT1.05 in
0–3 km LR3.0 °C/km
700–500 LR7.9 °C/km
Total Totals42.2
LCL973 hPa
LFC544 hPa
EL406 hPa
Freezing Lvl14,459 ft