Flood Watch 3:00 PM

Johnson County, Iowa, United States

Last updated: 6:14 PM CDT  ·  Refresh
28°C
Feels like 31°
Partly Cloudy
▲ 29°  /  ▼ 19°
Wind
8 mph N
Humidity
76%
Dew Point
22°
Pressure
29.18 inHg
Visibility
10 mi
UV Index
5.2
Cloud Cover
37%
Sunrise
5:37 AM
Sunset
8:44 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Johnson County is currently partly cloudy at 28°C. Precipitation is likely — peak probability 57% around 5 PM. Atmospheric instability is elevated (CAPE up to 2004 J/kg) — isolated convective development possible. Sunrise: 5:37AM · Sunset: 8:44PM.

Alerts

Flood Watch
Expires 3:00 PM
45 AQI · Good Dominant: O3 Air Quality
Hourly Forecast · Next 24 Hours
Now
28°
26%
7 PM
28°
48%
8 PM
27°
34%
9 PM
25°
34%
10 PM
24°
29%
11 PM
23°
38%
12 AM
23°
28%
1 AM
22°
16%
2 AM
22°
12%
3 AM
22°
29%
4 AM
22°
26%
5 AM
20°
18%
6 AM
20°
13%
7 AM
21°
19%
8 AM
21°
29%
9 AM
23°
30%
10 AM
24°
45%
11 AM
24°
46%
12 PM
25°
46%
1 PM
27°
53%
2 PM
27°
53%
3 PM
27°
53%
4 PM
27°
55%
5 PM
26°
56%
7-Day Forecast
Tonight
29° 19°
Partly Cloudy with a 34% chance of rain.
Sun
28° 20°
Mostly Cloudy with a 56% chance of rain.
Mon
28° 17°
Clear.
Tue
29° 16°
Fog.
Wed
28° 18°
Rain, 72% chance.
Thu
26° 19°
Rain, 71% chance.
Fri
27° 18°
Partly Cloudy with a 52% chance of rain.
TimeTempConditionsPrecipWindHumidity
Now 28° Partly Cloudy 26% 8 mph N 76%
7 PM 28° Partly Cloudy 48% 5 mph NNE 81%
8 PM 27° Mostly Cloudy 34% 4 mph NE 84%
9 PM 25° Mostly Cloudy 34% 4 mph NE 89%
10 PM 24° Mostly Cloudy 29% 4 mph NE 92%
11 PM 23° Mostly Cloudy 38% 3 mph NE 94%
12 AM 23° Overcast 28% 3 mph NNE 95%
1 AM 22° Overcast 16% 3 mph N 96%
2 AM 22° Overcast 12% 3 mph N 97%
3 AM 22° Overcast 29% 4 mph N 97%
4 AM 22° Overcast 26% 4 mph N 97%
5 AM 20° Overcast 18% 5 mph NNE 97%
6 AM 20° Haze 13% 5 mph NNE 96%
7 AM 21° Overcast 19% 6 mph NE 95%
8 AM 21° Overcast 29% 6 mph NE 91%
9 AM 23° Overcast 30% 6 mph NE 86%
10 AM 24° Mostly Cloudy 45% 6 mph NE 80%
11 AM 24° Mostly Cloudy 46% 6 mph NE 76%
12 PM 25° Mostly Cloudy 46% 6 mph NE 73%
1 PM 27° Mostly Cloudy 53% 6 mph NE 71%
2 PM 27° Mostly Cloudy 53% 6 mph NNE 72%
3 PM 27° Mostly Cloudy 53% 7 mph NNE 72%
4 PM 27° Mostly Cloudy 55% 8 mph NNE 73%
5 PM 26° Partly Cloudy 56% 7 mph NNE 74%
15-Day Forecast
Today
7/4
Partly Cloudy
34%
19°
29°
Sun
7/5
Mostly Cloudy
56%
20°
28°
Mon
7/6
Clear
12%
17°
28°
Tue
7/7
Fog
15%
16°
29°
Wed
7/8
Rain
72%
18°
28°
Thu
7/9
Rain
71%
19°
26°
Fri
7/10
Partly Cloudy
52%
18°
27°
Sat
7/11
Mostly Clear
31%
16°
26°
Sun
7/12
Mostly Clear
43%
14°
27°
Mon
7/13
Mostly Cloudy
44%
16°
29°
Tue
7/14
Drizzle
51%
18°
29°
Wed
7/15
Drizzle
60%
17°
28°
Thu
7/16
Drizzle
60%
17°
26°
Fri
7/17
Drizzle
60%
16°
26°
Sat
7/18
Drizzle
60%
17°
27°
45
Good
U.S. Air Quality Index · Dominant: O3
50 100 150 200

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

Pollutant Breakdown · Today
PM2.5
Fine particulate matter
42 AQI 7.6 µg/m³
O3
Ground-level ozone
Dominant
45 AQI 49 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Sun 45 Good 45 42
Mon 38 Good 37 38
Tue 43 Good 37 43
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 Jul 4, 22:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE2328 J/kg
MLCAPE1316 J/kg
MUCAPE2328 J/kg
SBCIN-15 J/kg
MLCIN0 J/kg
Lifted Index-7.2
Kinematics
0–6 km Shear19 kt
0–1 km Shear6 kt
Eff. Shear18 kt
0–1 km SRH-7
0–3 km SRH-26
Eff. SRH-26
Storm Motion213° @ 6 kt
0–1 km EHI-0.1
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index32.4
Thermo & Levels
PWAT1.58 in
0–3 km LR7.0 °C/km
700–500 LR6.0 °C/km
Total Totals48.7
LCL908 hPa
LFC892 hPa
EL174 hPa
Freezing Lvl14,062 ft