Heat Advisory — Iowa, IA, Johnson, IA, Cedar, IA, Muscatine, IA, Scott, IA, Keokuk, IA, Washington, IA, Louisa, IA, Jefferson, IA, Henry, IA, Des Moines, IA, Van Buren, IA, Lee, IA, Rock Island, IL, Henry, IL, Mercer, IL, Henderson, IL, Warren, IL, Hancock, IL, McDonough, IL, Scotland, MO, Clark, MO 7:00 PM

Johnson County, Iowa, United States

Last updated: 12:19 AM CDT  ·  Refresh
25°C
Feels like 25°
Mostly Clear
▲ 33°  /  ▼ 22°
Wind
10 mph SSE
Humidity
71%
Dew Point
20°
Pressure
29.12 inHg
Visibility
10 mi
UV Index
0.0
Cloud Cover
19%
Sunrise
6:31 AM
Sunset
7:41 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Johnson County is currently mostly clear at 25°C. Dry conditions are expected through the next 24 hours. Atmospheric instability is elevated (CAPE up to 2490 J/kg) — isolated convective development possible. Sunrise: 6:31AM · Sunset: 7:41PM.

Alerts

Heat Advisory
Iowa, IA, Johnson, IA, Cedar, IA, Muscatine, IA, Scott, IA, Keokuk, IA, Washington, IA, Louisa, IA, Jefferson, IA, Henry, IA, Des Moines, IA, Van Buren, IA, Lee, IA, Rock Island, IL, Henry, IL, Mercer, IL, Henderson, IL, Warren, IL, Hancock, IL, McDonough, IL, Scotland, MO, Clark, MO
Expires 7:00 PM
63 AQI · Moderate Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
25°
18%
1 AM
25°
17%
2 AM
24°
17%
3 AM
24°
19%
4 AM
23°
16%
5 AM
22°
17%
6 AM
22°
14%
7 AM
22°
15%
8 AM
24°
19%
9 AM
25°
27%
10 AM
27°
20%
11 AM
28°
17%
12 PM
29°
17%
1 PM
31°
15%
2 PM
32°
19%
3 PM
32°
21%
4 PM
32°
25%
5 PM
33°
21%
6 PM
31°
22%
7 PM
29°
10%
8 PM
28°
14%
9 PM
27°
14%
10 PM
27°
24%
11 PM
26°
24%
7-Day Forecast
Today
33° 22°
Mostly Cloudy with a 27% chance of rain.
Tue
36° 22°
Mostly Clear with a 20% chance of rain.
Wed
36° 22°
Mostly Clear with a 51% chance of rain.
Thu
34° 19°
Rain, 60% chance.
Fri
36° 22°
Thunderstorm, 52% chance.
Sat
33° 21°
Clear with a 63% chance of rain.
Sun
31° 18°
Partly Cloudy with a 47% chance of rain.
TimeTempConditionsPrecipWindHumidity
Now 25° Mostly Clear 18% 10 mph SSE 71%
1 AM 25° Partly Cloudy 17% 10 mph S 65%
2 AM 24° Partly Cloudy 17% 10 mph S 68%
3 AM 24° Mostly Cloudy 19% 9 mph S 71%
4 AM 23° Mostly Cloudy 16% 9 mph S 73%
5 AM 22° Partly Cloudy 17% 9 mph SSW 74%
6 AM 22° Partly Cloudy 14% 10 mph SSW 75%
7 AM 22° Partly Cloudy 15% 10 mph SSW 74%
8 AM 24° Mostly Clear 19% 11 mph SSW 70%
9 AM 25° Partly Cloudy 27% 12 mph SW 65%
10 AM 27° Partly Cloudy 20% 12 mph SW 61%
11 AM 28° Partly Cloudy 17% 11 mph SW 57%
12 PM 29° Mostly Cloudy 17% 10 mph SW 53%
1 PM 31° Mostly Cloudy 15% 9 mph SW 49%
2 PM 32° Mostly Cloudy 19% 9 mph SW 47%
3 PM 32° Mostly Cloudy 21% 8 mph SW 46%
4 PM 32° Overcast 25% 7 mph SW 48%
5 PM 33° Mostly Cloudy 21% 6 mph SW 55%
6 PM 31° Mostly Cloudy 22% 5 mph SSW 62%
7 PM 29° Mostly Cloudy 10% 5 mph SSW 67%
8 PM 28° Mostly Cloudy 14% 5 mph SSW 70%
9 PM 27° Mostly Cloudy 14% 6 mph SSW 74%
10 PM 27° Mostly Cloudy 24% 6 mph S 76%
11 PM 26° Partly Cloudy 24% 5 mph SSW 77%
15-Day Forecast
Today
8/31
Mostly Cloudy
27%
22°
33°
Tue
9/1
Mostly Clear
20%
22°
36°
Wed
9/2
Mostly Clear
51%
22°
36°
Thu
9/3
Rain
60%
19°
34°
Fri
9/4
Thunderstorm
52%
22°
36°
Sat
9/5
Clear
63%
21°
33°
Sun
9/6
Partly Cloudy
47%
18°
31°
Mon
9/7
Overcast
34%
18°
32°
Tue
9/8
Mostly Clear
35%
20°
38°
Wed
9/9
Clear
24%
19°
39°
Thu
9/10
Drizzle
60%
17°
39°
Fri
9/11
Drizzle
60%
17°
29°
Sat
9/12
Drizzle
60%
17°
29°
Sun
9/13
Drizzle
60%
17°
31°
Mon
9/14
Drizzle
60%
16°
28°
63
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
63 AQI 15.4 µg/m³
O3
Ground-level ozone
41 AQI 44 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Today 63 Moderate 41 63
Tue 66 Moderate 42 66
Wed 68 Moderate 44 68
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 Aug 31, 04:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE191 J/kg
MLCAPE122 J/kg
MUCAPE894 J/kg
SBCIN-627 J/kg
MLCIN-481 J/kg
Lifted Index-1.6
Kinematics
0–6 km Shear29 kt
0–1 km Shear33 kt
Eff. Shear—
0–1 km SRH383
0–3 km SRH455
Eff. SRH—
Storm Motion281° @ 17 kt
0–1 km EHI0.5
Composite Parameters
Sig. Tornado0.2
STP (eff)—
Supercell—
K-Index31.0
Thermo & Levels
PWAT1.79 in
0–3 km LR4.3 °C/km
700–500 LR6.9 °C/km
Total Totals45.2
LCL920 hPa
LFC586 hPa
EL234 hPa
Freezing Lvl15,469 ft