Heat Advisory — Knox, NE, Cedar, NE, Antelope, NE, Pierce, NE, Douglas, NE, Sarpy, NE, Thurston, NE, Wayne, NE, Boone, NE, Madison, NE, Stanton, NE, Cuming, NE, Burt, NE, Platte, NE, Colfax, NE, Dodge, NE, Washington, NE, Butler, NE, Saunders, NE, Seward, NE, Lancaster, NE, Cass, NE, Otoe, NE, Saline, NE, Jefferson, NE, Gage, NE, Johnson, NE, Nemaha, NE, Pawnee, NE, Richardson, NE 10:00 PM

Johnson County, Nebraska, United States

Last updated: 4:44 AM CDT  ·  Refresh
28°C
Feels like 29°
Mostly Clear
▲ 41°  /  ▼ 24°
Wind
10 mph SSW
Humidity
61%
Dew Point
21°
Pressure
28.52 inHg
Visibility
10 mi
UV Index
0.0
Cloud Cover
13%
Sunrise
6:18 AM
Sunset
8:44 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Johnson County is currently mostly clear at 28°C. Precipitation is likely — peak probability 57% around 4 AM. Atmospheric instability is elevated (CAPE up to 2035 J/kg) — isolated convective development possible. Sunrise: 6:18AM · Sunset: 8:44PM.

Alerts

Heat Advisory
Knox, NE, Cedar, NE, Antelope, NE, Pierce, NE, Douglas, NE, Sarpy, NE, Thurston, NE, Wayne, NE, Boone, NE, Madison, NE, Stanton, NE, Cuming, NE, Burt, NE, Platte, NE, Colfax, NE, Dodge, NE, Washington, NE, Butler, NE, Saunders, NE, Seward, NE, Lancaster, NE, Cass, NE, Otoe, NE, Saline, NE, Jefferson, NE, Gage, NE, Johnson, NE, Nemaha, NE, Pawnee, NE, Richardson, NE
Expires 10:00 PM
51 AQI · Moderate Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
28°
13%
5 AM
26°
27%
6 AM
26°
27%
7 AM
27°
27%
8 AM
29°
27%
9 AM
32°
27%
10 AM
33°
25%
11 AM
35°
24%
12 PM
37°
18%
1 PM
38°
12%
2 PM
39°
20%
3 PM
39°
20%
4 PM
39°
28%
5 PM
40°
29%
6 PM
40°
29%
7 PM
38°
30%
8 PM
36°
30%
9 PM
33°
31%
10 PM
32°
34%
11 PM
30°
35%
12 AM
29°
48%
1 AM
29°
47%
2 AM
28°
51%
3 AM
28°
55%
7-Day Forecast
Today
41° 24°
Mostly Clear with a 34% chance of rain.
Tue
35° 23°
Mostly Cloudy with a 57% chance of rain.
Wed
36° 21°
Partly Cloudy with a 37% chance of rain.
Thu
33° 22°
Overcast with a 71% chance of rain.
Fri
35° 20°
Partly Cloudy with a 71% chance of rain.
Sat
35° 19°
Clear.
Sun
37° 19°
Clear.
TimeTempConditionsPrecipWindHumidity
Now 28° Mostly Clear 13% 10 mph SSW 61%
5 AM 26° Partly Cloudy 27% 10 mph SSW 59%
6 AM 26° Mostly Clear 27% 10 mph SSW 61%
7 AM 27° Clear 27% 11 mph SSW 56%
8 AM 29° Clear 27% 12 mph SW 50%
9 AM 32° Clear 27% 12 mph SW 44%
10 AM 33° Clear 25% 11 mph SW 40%
11 AM 35° Mostly Clear 24% 10 mph SW 36%
12 PM 37° Partly Cloudy 18% 8 mph SW 33%
1 PM 38° Partly Cloudy 12% 8 mph SW 31%
2 PM 39° Partly Cloudy 20% 8 mph SW 29%
3 PM 39° Mostly Clear 20% 8 mph SW 28%
4 PM 39° Mostly Clear 28% 7 mph SW 28%
5 PM 40° Partly Cloudy 29% 7 mph SSW 28%
6 PM 40° Partly Cloudy 29% 7 mph S 28%
7 PM 38° Partly Cloudy 30% 6 mph S 34%
8 PM 36° Partly Cloudy 30% 6 mph SSE 40%
9 PM 33° Mostly Cloudy 31% 6 mph SSE 46%
10 PM 32° Mostly Cloudy 34% 6 mph SE 52%
11 PM 30° Mostly Cloudy 35% 6 mph SE 58%
12 AM 29° Mostly Cloudy 48% 7 mph SE 63%
1 AM 29° Mostly Cloudy 47% 7 mph ESE 65%
2 AM 28° Mostly Cloudy 51% 7 mph ESE 67%
3 AM 28° Rain 55% 8 mph E 69%
15-Day Forecast
Today
7/27
Mostly Clear
34%
24°
41°
Tue
7/28
Mostly Cloudy
57%
23°
35°
Wed
7/29
Partly Cloudy
37%
21°
36°
Thu
7/30
Overcast
71%
22°
33°
Fri
7/31
Partly Cloudy
71%
20°
35°
Sat
8/1
Clear
14%
19°
35°
Sun
8/2
Clear
8%
19°
37°
Mon
8/3
Clear
34%
21°
38°
Tue
8/4
Drizzle
35%
21°
39°
Wed
8/5
Drizzle
54%
19°
33°
Thu
8/6
Drizzle
60%
22°
36°
Fri
8/7
Drizzle
60%
21°
35°
Sat
8/8
Drizzle
60%
21°
35°
Sun
8/9
Drizzle
60%
22°
36°
Mon
8/10
Drizzle
60%
21°
37°
51
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
51 AQI 9.4 µg/m³
O3
Ground-level ozone
39 AQI 42 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Today 51 Moderate 39 51
Tue 53 Moderate 44 53
Wed 77 Moderate 77 52
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 Jul 27, 08:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 50 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE805 J/kg
MLCAPE868 J/kg
MUCAPE1388 J/kg
SBCIN-714 J/kg
MLCIN0 J/kg
Lifted Index-3.2
Kinematics
0–6 km Shear21 kt
0–1 km Shear30 kt
Eff. Shear34 kt
0–1 km SRH196
0–3 km SRH220
Eff. SRH13
Storm Motion257° @ 26 kt
0–1 km EHI1.0
Composite Parameters
Sig. Tornado0.4
STP (eff)0.0
Supercell0.3
K-Index35.9
Thermo & Levels
PWAT1.81 in
0–3 km LR4.6 °C/km
700–500 LR7.5 °C/km
Total Totals51.3
LCL871 hPa
LFC600 hPa
EL199 hPa
Freezing Lvl15,758 ft