Severe Thunderstorm Watch 9:00 PM

Union County, Illinois, United States

Last updated: 8:28 PM CDT  ·  Refresh
28°C
Feels like 32°
Mostly Clear
▲ 35°  /  ▼ 19°
Wind
7 mph N
Humidity
79%
Dew Point
23°
Pressure
29.24 inHg
Visibility
10 mi
UV Index
0.0
Cloud Cover
23%
Sunrise
5:52 AM
Sunset
8:13 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Union County is currently mostly clear at 28°C. Dry conditions are expected through the next 24 hours. Atmospheric instability is elevated (CAPE up to 1319 J/kg) — isolated convective development possible. Sunrise: 5:52AM · Sunset: 8:13PM.

Alerts

Severe Thunderstorm Watch
Expires 9:00 PM
44 AQI · Good Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
28°
11%
9 PM
26°
14%
10 PM
25°
14%
11 PM
24°
7%
12 AM
23°
7%
1 AM
22°
3%
2 AM
22°
3%
3 AM
21°
3%
4 AM
20°
3%
5 AM
19°
3%
6 AM
19°
3%
7 AM
20°
3%
8 AM
22°
3%
9 AM
23°
3%
10 AM
24°
5%
11 AM
25°
5%
12 PM
26°
5%
1 PM
27°
5%
2 PM
27°
5%
3 PM
28°
5%
4 PM
28°
3%
5 PM
27°
3%
6 PM
27°
3%
7 PM
26°
3%
7-Day Forecast
Tonight
35° 19°
Mostly Clear.
Wed
29° 18°
Mostly Clear.
Thu
27° 16°
Clear.
Fri
23° 17°
Overcast with a 54% chance of rain.
Sat
29° 18°
Partly Cloudy with a 45% chance of rain.
Sun
33° 23°
Clear.
Mon
34° 23°
Clear.
TimeTempConditionsPrecipWindHumidity
Now 28° Mostly Clear 11% 7 mph N 79%
9 PM 26° Clear 14% 6 mph N 84%
10 PM 25° Clear 14% 8 mph N 83%
11 PM 24° Clear 7% 8 mph N 83%
12 AM 23° Clear 7% 8 mph N 83%
1 AM 22° Clear 3% 8 mph N 84%
2 AM 22° Clear 3% 8 mph N 86%
3 AM 21° Clear 3% 7 mph N 88%
4 AM 20° Clear 3% 6 mph NNW 89%
5 AM 19° Clear 3% 6 mph NNW 89%
6 AM 19° Clear 3% 7 mph N 88%
7 AM 20° Clear 3% 8 mph N 86%
8 AM 22° Clear 3% 8 mph N 81%
9 AM 23° Clear 3% 8 mph N 77%
10 AM 24° Mostly Clear 5% 8 mph N 74%
11 AM 25° Mostly Clear 5% 9 mph N 71%
12 PM 26° Partly Cloudy 5% 10 mph N 67%
1 PM 27° Partly Cloudy 5% 10 mph N 65%
2 PM 27° Partly Cloudy 5% 10 mph NNE 64%
3 PM 28° Partly Cloudy 5% 10 mph NNE 63%
4 PM 28° Partly Cloudy 3% 10 mph NNE 64%
5 PM 27° Partly Cloudy 3% 10 mph NNE 67%
6 PM 27° Partly Cloudy 3% 9 mph NNE 69%
7 PM 26° Partly Cloudy 3% 9 mph NNE 71%
15-Day Forecast
Today
7/21
Mostly Clear
11%
19°
35°
Wed
7/22
Mostly Clear
5%
18°
29°
Thu
7/23
Clear
3%
16°
27°
Fri
7/24
Overcast
54%
17°
23°
Sat
7/25
Partly Cloudy
45%
18°
29°
Sun
7/26
Clear
17%
23°
33°
Mon
7/27
Clear
17%
23°
34°
Tue
7/28
Rain
28%
19°
32°
Wed
7/29
Drizzle
44%
18°
29°
Thu
7/30
Drizzle
44%
16°
29°
Fri
7/31
Drizzle
60%
17°
29°
Sat
8/1
Clear
60%
19°
30°
Sun
8/2
Drizzle
60%
20°
31°
Mon
8/3
Drizzle
60%
20°
31°
Tue
8/4
Drizzle
60%
21°
32°
44
Good
U.S. Air Quality Index · Dominant: PM2.5
50 100 150 200

Air quality is satisfactory and poses little or no health risk.

Pollutant Breakdown · Today
PM2.5
Fine particulate matter
Dominant
44 AQI 7.9 µg/m³
O3
Ground-level ozone
36 AQI 39 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Today 44 Good 36 44
Thu 31 Good 31 21
Fri 33 Good 33 11
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 Tue Jul 21, 23:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 50 60 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE1171 J/kg
MLCAPE924 J/kg
MUCAPE1342 J/kg
SBCIN-133 J/kg
MLCIN0 J/kg
Lifted Index-1.6
Kinematics
0–6 km Shear39 kt
0–1 km Shear10 kt
Eff. Shear43 kt
0–1 km SRH-78
0–3 km SRH-89
Eff. SRH-89
Storm Motion279° @ 31 kt
0–1 km EHI-0.6
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index9.3
Thermo & Levels
PWAT1.57 in
0–3 km LR4.9 °C/km
700–500 LR5.7 °C/km
Total Totals41.3
LCL924 hPa
LFC824 hPa
EL161 hPa
Freezing Lvl17,349 ft