Flash Flood Warning — Benton County, IA, Cedar County, IA, Iowa County, IA, Johnson County, IA, Jones County, IA, Linn County, IA 8:00 AM Flash Flood Warning — Cedar County, IA, Iowa County, IA, Johnson County, IA, Keokuk County, IA, Louisa County, IA, Muscatine County, IA, Washington County, IA 8:15 AM Areal Flood Watch 1:00 PM Flood Watch 6:00 AM Flood Warning — Johnson County, IA, Washington County, IA 5:00 PM Flood Warning — Johnson County, IA, Louisa County, IA, Washington County, IA 6:00 PM

Johnson County, Iowa, United States

Last updated: 7:40 AM CDT  ·  Refresh
19°C
Feels like 21°
Rain
▲ 20°  /  ▼ 14°
Wind
6 mph NE
Humidity
97%
Dew Point
19°
Pressure
29.14 inHg
Visibility
4 mi
UV Index
0.8
Cloud Cover
96%
Sunrise
6:51 AM
Sunset
7:06 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Johnson County is currently rain at 20°C. Precipitation is likely — peak probability 88% around 8 AM. Sunrise: 6:51AM · Sunset: 7:06PM.

Alerts

Flash Flood Warning
Benton County, IA, Cedar County, IA, Iowa County, IA, Johnson County, IA, Jones County, IA, Linn County, IA
Expires 8:00 AM
Flash Flood Warning
Cedar County, IA, Iowa County, IA, Johnson County, IA, Keokuk County, IA, Louisa County, IA, Muscatine County, IA, Washington County, IA
Expires 8:15 AM
Areal Flood Watch
Expires 1:00 PM
Flood Watch
Expires 6:00 AM
Flood Warning
Johnson County, IA, Washington County, IA
Expires 5:00 PM
Flood Warning
Johnson County, IA, Louisa County, IA, Washington County, IA
Expires 6:00 PM
28 AQI · Good Dominant: O3 Air Quality
Hourly Forecast · Next 24 Hours
Now
19°
87%
8 AM
19°
88%
9 AM
18°
85%
10 AM
17°
78%
11 AM
17°
72%
12 PM
16°
59%
1 PM
17°
44%
2 PM
17°
20%
3 PM
17°
20%
4 PM
17°
18%
5 PM
17°
31%
6 PM
17°
39%
7 PM
17°
37%
8 PM
17°
27%
9 PM
17°
29%
10 PM
17°
29%
11 PM
17°
29%
12 AM
16°
29%
1 AM
16°
36%
2 AM
16°
40%
3 AM
16°
40%
4 AM
16°
40%
5 AM
14°
43%
6 AM
14°
43%
7-Day Forecast
Today
20° 14°
Rain, 87% chance.
Mon
18° 12°
Overcast with a 55% chance of rain.
Tue
16° 9°
Mostly Cloudy with a 55% chance of rain.
Wed
19° 8°
Partly Cloudy.
Thu
20° 10°
Overcast.
Fri
19° 12°
Overcast with a 22% chance of rain.
Sat
19° 12°
Drizzle, 53% chance.
TimeTempConditionsPrecipWindHumidity
Now 19° Rain 87% 6 mph NE 97%
8 AM 19° Overcast 88% 9 mph NE 95%
9 AM 18° Overcast 85% 11 mph NE 94%
10 AM 17° Overcast 78% 12 mph NE 93%
11 AM 17° Overcast 72% 13 mph NE 93%
12 PM 16° Overcast 59% 14 mph NE 93%
1 PM 17° Overcast 44% 14 mph NE 92%
2 PM 17° Overcast 20% 14 mph NE 90%
3 PM 17° Overcast 20% 14 mph NE 89%
4 PM 17° Overcast 18% 13 mph NE 88%
5 PM 17° Overcast 31% 12 mph NE 89%
6 PM 17° Overcast 39% 12 mph NE 89%
7 PM 17° Overcast 37% 12 mph NE 88%
8 PM 17° Overcast 27% 13 mph ENE 85%
9 PM 17° Overcast 29% 13 mph ENE 83%
10 PM 17° Overcast 29% 13 mph ENE 82%
11 PM 17° Overcast 29% 13 mph ENE 83%
12 AM 16° Overcast 29% 13 mph ENE 83%
1 AM 16° Overcast 36% 13 mph NE 83%
2 AM 16° Overcast 40% 12 mph NE 83%
3 AM 16° Overcast 40% 12 mph NE 83%
4 AM 16° Overcast 40% 12 mph NE 84%
5 AM 14° Overcast 43% 12 mph NE 85%
6 AM 14° Overcast 43% 12 mph NE 85%
15-Day Forecast
Today
9/20
Rain
87%
14°
20°
Mon
9/21
Overcast
55%
12°
18°
Tue
9/22
Mostly Cloudy
55%
9°
16°
Wed
9/23
Partly Cloudy
3%
8°
19°
Thu
9/24
Overcast
17%
10°
20°
Fri
9/25
Overcast
22%
12°
19°
Sat
9/26
Drizzle
53%
12°
19°
Sun
9/27
Mostly Cloudy
39%
11°
22°
Mon
9/28
Drizzle
39%
12°
23°
Tue
9/29
Overcast
44%
14°
21°
Wed
9/30
Drizzle
60%
12°
21°
Thu
10/1
Drizzle
60%
12°
21°
Fri
10/2
Drizzle
60%
12°
20°
Sat
10/3
Drizzle
60%
11°
20°
Sun
10/4
Drizzle
60%
12°
21°
28
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
8 AQI 1.5 µg/m³
O3
Ground-level ozone
Dominant
28 AQI 31 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Mon 28 Good 28 8
Tue 19 Good 19 3
Wed 16 Good 16 7
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 Sun Sep 20, 11:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE1 J/kg
MLCAPE17 J/kg
MUCAPE23 J/kg
SBCIN-48 J/kg
MLCIN0 J/kg
Lifted Index1.3
Kinematics
0–6 km Shear16 kt
0–1 km Shear6 kt
Eff. Shear—
0–1 km SRH3
0–3 km SRH42
Eff. SRH—
Storm Motion348° @ 17 kt
0–1 km EHI0.0
Composite Parameters
Sig. Tornado0.0
STP (eff)—
Supercell—
K-Index34.8
Thermo & Levels
PWAT2.01 in
0–3 km LR4.5 °C/km
700–500 LR5.2 °C/km
Total Totals43.3
LCL982 hPa
LFC667 hPa
EL627 hPa
Freezing Lvl13,543 ft