Excessive Heat Warning — Boone, NE, Burt, NE, Platte, NE, Colfax, NE, Dodge, NE, Washington, NE, Harrison, IA, Shelby, IA, Douglas, NE, Sarpy, NE, Knox, NE, Cedar, NE, Antelope, NE, Pierce, NE, Thurston, NE, Wayne, NE, Madison, NE, Stanton, NE, Cuming, 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 7:00 AM Heat Advisory — Knox, NE, Cedar, NE, Antelope, NE, Pierce, NE, Thurston, NE, Wayne, NE, Madison, NE, Stanton, NE, Cuming, NE, Boone, NE, Burt, NE, Platte, NE, Colfax, NE, Dodge, NE, Washington, NE, Harrison, IA, Shelby, IA, Douglas, NE, Sarpy, 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 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: 5:52 AM CDT  ·  Refresh
27°C
Feels like 29°
Clear
▲ 41°  /  ▼ 23°
Wind
9 mph SSW
Humidity
62%
Dew Point
21°
Pressure
28.52 inHg
Visibility
10 mi
UV Index
0.0
Cloud Cover
7%
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 clear at 27°C. Precipitation is likely — peak probability 55% around 3 AM. Atmospheric instability is elevated (CAPE up to 2050 J/kg) — isolated convective development possible. Sunrise: 6:18AM · Sunset: 8:44PM.

Alerts

Excessive Heat Warning
Boone, NE, Burt, NE, Platte, NE, Colfax, NE, Dodge, NE, Washington, NE, Harrison, IA, Shelby, IA, Douglas, NE, Sarpy, NE, Knox, NE, Cedar, NE, Antelope, NE, Pierce, NE, Thurston, NE, Wayne, NE, Madison, NE, Stanton, NE, Cuming, 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 7:00 AM
Heat Advisory
Knox, NE, Cedar, NE, Antelope, NE, Pierce, NE, Thurston, NE, Wayne, NE, Madison, NE, Stanton, NE, Cuming, NE, Boone, NE, Burt, NE, Platte, NE, Colfax, NE, Dodge, NE, Washington, NE, Harrison, IA, Shelby, IA, Douglas, NE, Sarpy, 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
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
27°
11%
6 AM
26°
27%
7 AM
27°
27%
8 AM
29°
27%
9 AM
32°
27%
10 AM
33°
25%
11 AM
35°
23%
12 PM
37°
15%
1 PM
38°
12%
2 PM
38°
19%
3 PM
39°
20%
4 PM
39°
28%
5 PM
40°
28%
6 PM
39°
29%
7 PM
37°
29%
8 PM
35°
30%
9 PM
32°
30%
10 PM
31°
34%
11 PM
30°
34%
12 AM
28°
47%
1 AM
28°
47%
2 AM
28°
51%
3 AM
27°
54%
4 AM
27°
52%
7-Day Forecast
Today
41° 23°
Mostly Clear with a 34% chance of rain.
Tue
36° 23°
Mostly Cloudy with a 52% chance of rain.
Wed
36° 21°
Partly Cloudy with a 41% chance of rain.
Thu
32° 22°
Overcast with a 71% chance of rain.
Fri
35° 19°
Partly Cloudy with a 48% chance of rain.
Sat
35° 19°
Clear.
Sun
37° 19°
Clear.
TimeTempConditionsPrecipWindHumidity
Now 27° Clear 11% 9 mph SSW 62%
6 AM 26° Clear 27% 9 mph S 60%
7 AM 27° Clear 27% 11 mph SSW 55%
8 AM 29° Clear 27% 12 mph SW 48%
9 AM 32° Clear 27% 12 mph SW 42%
10 AM 33° Clear 25% 11 mph SW 39%
11 AM 35° Clear 23% 10 mph SW 35%
12 PM 37° Mostly Clear 15% 8 mph SW 32%
1 PM 38° Partly Cloudy 12% 8 mph SW 30%
2 PM 38° Mostly Clear 19% 8 mph SW 29%
3 PM 39° Mostly Clear 20% 7 mph SW 28%
4 PM 39° Partly Cloudy 28% 7 mph SW 28%
5 PM 40° Partly Cloudy 28% 7 mph SSW 28%
6 PM 39° Partly Cloudy 29% 7 mph S 28%
7 PM 37° Partly Cloudy 29% 6 mph S 35%
8 PM 35° Partly Cloudy 30% 6 mph SSE 41%
9 PM 32° Partly Cloudy 30% 6 mph SSE 46%
10 PM 31° Partly Cloudy 34% 6 mph SE 52%
11 PM 30° Partly Cloudy 34% 6 mph SE 58%
12 AM 28° Partly Cloudy 47% 7 mph SE 63%
1 AM 28° Mostly Cloudy 47% 7 mph ESE 65%
2 AM 28° Mostly Cloudy 51% 7 mph ESE 67%
3 AM 27° Rain 54% 8 mph E 69%
4 AM 27° Rain 52% 7 mph E 73%
15-Day Forecast
Today
7/27
Mostly Clear
34%
23°
41°
Tue
7/28
Mostly Cloudy
52%
23°
36°
Wed
7/29
Partly Cloudy
41%
21°
36°
Thu
7/30
Overcast
71%
22°
32°
Fri
7/31
Partly Cloudy
48%
19°
35°
Sat
8/1
Clear
15%
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, 09:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE503 J/kg
MLCAPE577 J/kg
MUCAPE1071 J/kg
SBCIN-763 J/kg
MLCIN0 J/kg
Lifted Index-2.3
Kinematics
0–6 km Shear25 kt
0–1 km Shear29 kt
Eff. Shear35 kt
0–1 km SRH171
0–3 km SRH155
Eff. SRH-29
Storm Motion259° @ 28 kt
0–1 km EHI0.5
Composite Parameters
Sig. Tornado0.3
STP (eff)0.0
Supercell0.0
K-Index36.7
Thermo & Levels
PWAT1.79 in
0–3 km LR4.6 °C/km
700–500 LR7.1 °C/km
Total Totals49.5
LCL876 hPa
LFC596 hPa
EL218 hPa
Freezing Lvl15,791 ft