Heat Advisory — Jefferson, IL, Perry, IL, Franklin, IL, Jackson, IL, Williamson, IL, Union, IL, Johnson, IL, Pope, IL, Alexander, IL, Pulaski, IL, Massac, IL, Fulton, KY, Hickman, KY, Carlisle, KY, Ballard, KY, McCracken, KY, Graves, KY, Livingston, KY, Marshall, KY, Calloway, KY, Perry, MO, Bollinger, MO, Cape Girardeau, MO, Wayne, MO, Carter, MO, Ripley, MO, Butler, MO, Stoddard, MO, Scott, MO, Mississippi, MO, New Madrid, MO 7:00 PM

Union County, Illinois, United States

Last updated: 12:12 PM CDT  ·  Refresh
32°C
Feels like 41°
Mostly Clear
▲ 37°  /  ▼ 24°
Wind
5 mph SW
Humidity
70%
Dew Point
26°
Pressure
29.34 inHg
Visibility
10 mi
UV Index
9.5
Cloud Cover
22%
Sunrise
5:56 AM
Sunset
8:10 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Union County is currently mostly clear at 32°C. Dry conditions are expected through the next 24 hours. Atmospheric instability is elevated (CAPE up to 4198 J/kg) — isolated convective development possible. Sunrise: 5:56AM · Sunset: 8:10PM.

Alerts

Heat Advisory
Jefferson, IL, Perry, IL, Franklin, IL, Jackson, IL, Williamson, IL, Union, IL, Johnson, IL, Pope, IL, Alexander, IL, Pulaski, IL, Massac, IL, Fulton, KY, Hickman, KY, Carlisle, KY, Ballard, KY, McCracken, KY, Graves, KY, Livingston, KY, Marshall, KY, Calloway, KY, Perry, MO, Bollinger, MO, Cape Girardeau, MO, Wayne, MO, Carter, MO, Ripley, MO, Butler, MO, Stoddard, MO, Scott, MO, Mississippi, MO, New Madrid, MO
Expires 7:00 PM
51 AQI · Moderate Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
32°
14%
1 PM
34°
32%
2 PM
34°
31%
3 PM
35°
33%
4 PM
36°
21%
5 PM
36°
32%
6 PM
35°
23%
7 PM
34°
13%
8 PM
33°
18%
9 PM
30°
5%
10 PM
29°
5%
11 PM
29°
9%
12 AM
28°
9%
1 AM
27°
9%
2 AM
27°
5%
3 AM
26°
5%
4 AM
26°
5%
5 AM
24°
5%
6 AM
24°
3%
7 AM
25°
3%
8 AM
26°
10%
9 AM
28°
21%
10 AM
29°
21%
11 AM
31°
24%
7-Day Forecast
Today
37° 24°
Mostly Clear with a 33% chance of rain.
Mon
37° 24°
Mostly Clear with a 25% chance of rain.
Tue
37° 23°
Mostly Clear with a 49% chance of rain.
Wed
30° 21°
Clear with a 51% chance of rain.
Thu
32° 18°
Clear.
Fri
29° 20°
Drizzle, 60% chance.
Sat
30° 18°
Clear.
TimeTempConditionsPrecipWindHumidity
Now 32° Mostly Clear 14% 5 mph SW 70%
1 PM 34° Mostly Clear 32% 5 mph WSW 64%
2 PM 34° Partly Cloudy 31% 6 mph WSW 64%
3 PM 35° Mostly Clear 33% 6 mph SW 63%
4 PM 36° Partly Cloudy 21% 7 mph SW 61%
5 PM 36° Partly Cloudy 32% 7 mph SW 64%
6 PM 35° Mostly Clear 23% 7 mph SW 67%
7 PM 34° Mostly Clear 13% 6 mph SW 72%
8 PM 33° Partly Cloudy 18% 5 mph SSW 76%
9 PM 30° Mostly Cloudy 5% 5 mph SW 77%
10 PM 29° Mostly Cloudy 5% 5 mph SW 79%
11 PM 29° Mostly Cloudy 9% 3 mph SSW 81%
12 AM 28° Mostly Cloudy 9% 4 mph S 83%
1 AM 27° Partly Cloudy 9% 6 mph SE 85%
2 AM 27° Partly Cloudy 5% 6 mph SSE 86%
3 AM 26° Mostly Cloudy 5% 6 mph SSE 87%
4 AM 26° Mostly Cloudy 5% 6 mph SSE 88%
5 AM 24° Partly Cloudy 5% 6 mph S 87%
6 AM 24° Partly Cloudy 3% 6 mph S 86%
7 AM 25° Mostly Clear 3% 6 mph SSW 85%
8 AM 26° Partly Cloudy 10% 6 mph SSW 81%
9 AM 28° Partly Cloudy 21% 6 mph SSW 79%
10 AM 29° Partly Cloudy 21% 6 mph SW 76%
11 AM 31° Mostly Clear 24% 6 mph SSW 73%
15-Day Forecast
Today
7/26
Mostly Clear
33%
24°
37°
Mon
7/27
Mostly Clear
25%
24°
37°
Tue
7/28
Mostly Clear
49%
23°
37°
Wed
7/29
Clear
51%
21°
30°
Thu
7/30
Clear
19%
18°
32°
Fri
7/31
Drizzle
60%
20°
29°
Sat
8/1
Clear
19%
18°
30°
Sun
8/2
Drizzle
60%
19°
30°
Mon
8/3
Drizzle
60%
19°
31°
Tue
8/4
Drizzle
60%
21°
33°
Wed
8/5
Drizzle
60%
23°
34°
Thu
8/6
Drizzle
60%
22°
33°
Fri
8/7
Drizzle
60%
21°
32°
Sat
8/8
Drizzle
60%
21°
33°
Sun
8/9
Drizzle
60%
22°
33°
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 9.3 µg/m³
O3
Ground-level ozone
31 AQI 34 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Mon 51 Moderate 31 51
Tue 53 Moderate 31 53
Wed 44 Good 44 35
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 Jul 26, 15:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE5109 J/kg
MLCAPE3493 J/kg
MUCAPE5109 J/kg
SBCIN0 J/kg
MLCIN0 J/kg
Lifted Index-8.3
Kinematics
0–6 km Shear20 kt
0–1 km Shear8 kt
Eff. Shear24 kt
0–1 km SRH-22
0–3 km SRH-54
Eff. SRH-54
Storm Motion293° @ 19 kt
0–1 km EHI-0.7
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index36.7
Thermo & Levels
PWAT1.90 in
0–3 km LR6.9 °C/km
700–500 LR5.6 °C/km
Total Totals47.3
LCL910 hPa
LFC994 hPa
EL125 hPa
Freezing Lvl16,781 ft