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: 4:30 AM CDT  ·  Refresh
28°C
Feels like 30°
Mostly Clear
▲ 41°  /  ▼ 23°
Wind
9 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 67% around 4 AM. Atmospheric instability is elevated (CAPE up to 1992 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
28°
8%
5 AM
26°
23%
6 AM
26°
23%
7 AM
27°
23%
8 AM
29°
23%
9 AM
32°
23%
10 AM
33°
21%
11 AM
35°
21%
12 PM
37°
15%
1 PM
38°
9%
2 PM
39°
13%
3 PM
40°
21%
4 PM
40°
31%
5 PM
41°
31%
6 PM
41°
32%
7 PM
39°
32%
8 PM
37°
33%
9 PM
34°
33%
10 PM
32°
37%
11 PM
31°
38%
12 AM
29°
52%
1 AM
29°
51%
2 AM
28°
56%
3 AM
28°
60%
7-Day Forecast
Today
41° 23°
Mostly Clear with a 37% chance of rain.
Tue
36° 23°
Mostly Cloudy with a 66% chance of rain.
Wed
36° 21°
Mostly Clear with a 36% chance of rain.
Thu
33° 22°
Overcast with a 68% chance of rain.
Fri
35° 20°
Clear with a 69% chance of rain.
Sat
35° 18°
Clear.
Sun
37° 19°
Clear.
TimeTempConditionsPrecipWindHumidity
Now 28° Mostly Clear 8% 9 mph SSW 61%
5 AM 26° Partly Cloudy 23% 10 mph SSW 58%
6 AM 26° Mostly Clear 23% 9 mph SSW 60%
7 AM 27° Clear 23% 10 mph SSW 58%
8 AM 29° Clear 23% 11 mph SW 52%
9 AM 32° Clear 23% 12 mph SW 45%
10 AM 33° Clear 21% 12 mph SW 40%
11 AM 35° Mostly Clear 21% 11 mph SW 37%
12 PM 37° Partly Cloudy 15% 9 mph SW 33%
1 PM 38° Partly Cloudy 9% 8 mph SW 31%
2 PM 39° Partly Cloudy 13% 8 mph SW 30%
3 PM 40° Mostly Clear 21% 8 mph SW 28%
4 PM 40° Mostly Clear 31% 8 mph SW 28%
5 PM 41° Partly Cloudy 31% 8 mph SSW 28%
6 PM 41° Partly Cloudy 32% 7 mph SSW 28%
7 PM 39° Partly Cloudy 32% 7 mph S 32%
8 PM 37° Partly Cloudy 33% 7 mph SSE 38%
9 PM 34° Partly Cloudy 33% 7 mph SSE 44%
10 PM 32° Mostly Cloudy 37% 7 mph SSE 50%
11 PM 31° Mostly Cloudy 38% 7 mph SE 56%
12 AM 29° Mostly Cloudy 52% 7 mph SE 62%
1 AM 29° Mostly Cloudy 51% 7 mph SE 65%
2 AM 28° Mostly Cloudy 56% 7 mph ESE 67%
3 AM 28° Rain 60% 8 mph E 69%
15-Day Forecast
Today
7/27
Mostly Clear
37%
23°
41°
Tue
7/28
Mostly Cloudy
66%
23°
36°
Wed
7/29
Mostly Clear
36%
21°
36°
Thu
7/30
Overcast
68%
22°
33°
Fri
7/31
Clear
69%
20°
35°
Sat
8/1
Clear
8%
18°
35°
Sun
8/2
Clear
8%
19°
37°
Mon
8/3
Drizzle
43%
22°
38°
Tue
8/4
Drizzle
44%
22°
41°
Wed
8/5
Drizzle
68%
17°
33°
Thu
8/6
Drizzle
60%
22°
36°
Fri
8/7
Drizzle
60%
21°
34°
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
SBCAPE843 J/kg
MLCAPE875 J/kg
MUCAPE1388 J/kg
SBCIN-701 J/kg
MLCIN0 J/kg
Lifted Index-3.3
Kinematics
0–6 km Shear21 kt
0–1 km Shear30 kt
Eff. Shear34 kt
0–1 km SRH196
0–3 km SRH218
Eff. SRH12
Storm Motion258° @ 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 LR4.7 °C/km
700–500 LR7.5 °C/km
Total Totals51.3
LCL868 hPa
LFC602 hPa
EL197 hPa
Freezing Lvl15,755 ft