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: 12:05 AM CDT  ·  Refresh
77°F
Feels like 77°
Mostly Clear
▲ 92°  /  ▼ 71°
Wind
10 mph SSE
Humidity
71%
Dew Point
68°
Pressure
29.11 inHg
Visibility
9 mi
UV Index
0.0
Cloud Cover
21%
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 77°F. Dry conditions are expected through the next 24 hours. Atmospheric instability is elevated (CAPE up to 2434 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
77°
19%
1 AM
77°
17%
2 AM
76°
17%
3 AM
76°
19%
4 AM
75°
19%
5 AM
74°
17%
6 AM
72°
14%
7 AM
72°
15%
8 AM
75°
26%
9 AM
78°
38%
10 AM
79°
20%
11 AM
82°
20%
12 PM
85°
17%
1 PM
87°
15%
2 PM
89°
19%
3 PM
90°
21%
4 PM
90°
36%
5 PM
88°
39%
6 PM
89°
30%
7 PM
85°
19%
8 PM
84°
23%
9 PM
82°
23%
10 PM
81°
24%
11 PM
78°
26%
7-Day Forecast
Today
92° 71°
Mostly Cloudy with a 38% chance of rain.
Tue
97° 71°
Mostly Clear with a 20% chance of rain.
Wed
97° 72°
Mostly Clear with a 38% chance of rain.
Thu
96° 66°
Partly Cloudy with a 60% chance of rain.
Fri
98° 73°
Mostly Clear with a 22% chance of rain.
Sat
95° 71°
Clear with a 32% chance of rain.
Sun
90° 68°
Partly Cloudy with a 21% chance of rain.
TimeTempConditionsPrecipWindHumidity
Now 77° Mostly Clear 19% 10 mph SSE 71%
1 AM 77° Partly Cloudy 17% 11 mph S 65%
2 AM 76° Mostly Cloudy 17% 10 mph S 67%
3 AM 76° Mostly Cloudy 19% 10 mph S 70%
4 AM 75° Mostly Cloudy 19% 10 mph S 72%
5 AM 74° Partly Cloudy 17% 10 mph SSW 74%
6 AM 72° Partly Cloudy 14% 10 mph SSW 75%
7 AM 72° Partly Cloudy 15% 10 mph SSW 74%
8 AM 75° Partly Cloudy 26% 11 mph SSW 70%
9 AM 78° Partly Cloudy 38% 12 mph SW 66%
10 AM 79° Partly Cloudy 20% 13 mph SW 62%
11 AM 82° Partly Cloudy 20% 12 mph SW 58%
12 PM 85° Mostly Cloudy 17% 11 mph SW 54%
1 PM 87° Mostly Cloudy 15% 10 mph SW 49%
2 PM 89° Mostly Cloudy 19% 8 mph SW 47%
3 PM 90° Mostly Cloudy 21% 8 mph SW 46%
4 PM 90° Mostly Cloudy 36% 8 mph SW 46%
5 PM 88° Mostly Cloudy 39% 6 mph SSW 54%
6 PM 89° Mostly Cloudy 30% 5 mph SSW 61%
7 PM 85° Mostly Cloudy 19% 6 mph S 67%
8 PM 84° Mostly Cloudy 23% 5 mph S 70%
9 PM 82° Mostly Cloudy 23% 6 mph S 74%
10 PM 81° Mostly Cloudy 24% 6 mph S 77%
11 PM 78° Partly Cloudy 26% 5 mph S 77%
15-Day Forecast
Today
8/31
Mostly Cloudy
38%
71°
92°
Tue
9/1
Mostly Clear
20%
71°
97°
Wed
9/2
Mostly Clear
38%
72°
97°
Thu
9/3
Partly Cloudy
60%
66°
96°
Fri
9/4
Mostly Clear
22%
73°
98°
Sat
9/5
Clear
32%
71°
95°
Sun
9/6
Partly Cloudy
21%
68°
90°
Mon
9/7
Overcast
38%
66°
94°
Tue
9/8
Mostly Clear
35%
62°
82°
Wed
9/9
Clear
24%
61°
84°
Thu
9/10
Drizzle
60%
63°
86°
Fri
9/11
Drizzle
60%
62°
85°
Sat
9/12
Drizzle
60%
62°
84°
Sun
9/13
Drizzle
60%
62°
87°
Mon
9/14
Drizzle
60%
60°
82°
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, 03:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE87 J/kg
MLCAPE254 J/kg
MUCAPE1288 J/kg
SBCIN-659 J/kg
MLCIN-447 J/kg
Lifted Index-1.1
Kinematics
0–6 km Shear31 kt
0–1 km Shear30 kt
Eff. Shear—
0–1 km SRH323
0–3 km SRH406
Eff. SRH—
Storm Motion283° @ 17 kt
0–1 km EHI0.2
Composite Parameters
Sig. Tornado0.1
STP (eff)—
Supercell—
K-Index29.2
Thermo & Levels
PWAT1.75 in
0–3 km LR4.2 °C/km
700–500 LR6.9 °C/km
Total Totals45.1
LCL919 hPa
LFC570 hPa
EL278 hPa
Freezing Lvl15,558 ft