Severe Thunderstorm Watch 9:00 PM

Alexander County, Illinois, United States

Last updated: 8:30 PM CDT  ·  Refresh
28°C
Feels like 33°
Partly Cloudy
▲ 35°  /  ▼ 20°
Wind
5 mph N
Humidity
82%
Dew Point
24°
Pressure
29.40 inHg
Visibility
10 mi
UV Index
0.0
Cloud Cover
47%
Sunrise
5:53 AM
Sunset
8:13 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Alexander County is currently partly cloudy at 28°C. Dry conditions are expected through the next 24 hours. Atmospheric instability is elevated (CAPE up to 1981 J/kg) — isolated convective development possible. Sunrise: 5:53AM · Sunset: 8:13PM.

Alerts

Severe Thunderstorm Watch
Expires 9:00 PM
49 AQI · Good Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
28°
11%
9 PM
27°
14%
10 PM
26°
14%
11 PM
25°
14%
12 AM
24°
7%
1 AM
23°
3%
2 AM
22°
3%
3 AM
22°
3%
4 AM
21°
3%
5 AM
20°
3%
6 AM
20°
3%
7 AM
21°
3%
8 AM
22°
3%
9 AM
23°
3%
10 AM
24°
3%
11 AM
26°
3%
12 PM
27°
3%
1 PM
28°
3%
2 PM
28°
3%
3 PM
28°
3%
4 PM
28°
3%
5 PM
28°
3%
6 PM
27°
3%
7 PM
27°
3%
7-Day Forecast
Tonight
35° 20°
Clear.
Wed
30° 19°
Mostly Clear.
Thu
27° 17°
Clear.
Fri
24° 17°
Mostly Cloudy with a 44% chance of rain.
Sat
30° 18°
Partly Cloudy with a 45% chance of rain.
Sun
34° 23°
Clear.
Mon
34° 24°
Clear.
TimeTempConditionsPrecipWindHumidity
Now 28° Partly Cloudy 11% 5 mph N 82%
9 PM 27° Mostly Clear 14% 4 mph N 86%
10 PM 26° Clear 14% 5 mph N 86%
11 PM 25° Clear 14% 6 mph N 84%
12 AM 24° Clear 7% 8 mph N 84%
1 AM 23° Clear 3% 8 mph N 84%
2 AM 22° Clear 3% 8 mph N 85%
3 AM 22° Clear 3% 7 mph N 87%
4 AM 21° Clear 3% 6 mph N 88%
5 AM 20° Clear 3% 6 mph NNW 88%
6 AM 20° Clear 3% 7 mph NNW 88%
7 AM 21° Clear 3% 8 mph N 85%
8 AM 22° Clear 3% 8 mph N 81%
9 AM 23° Clear 3% 8 mph N 77%
10 AM 24° Mostly Clear 3% 8 mph N 73%
11 AM 26° Mostly Clear 3% 9 mph N 69%
12 PM 27° Partly Cloudy 3% 9 mph N 65%
1 PM 28° Partly Cloudy 3% 10 mph N 63%
2 PM 28° Partly Cloudy 3% 10 mph NNE 62%
3 PM 28° Partly Cloudy 3% 10 mph NNE 62%
4 PM 28° Partly Cloudy 3% 10 mph NNE 64%
5 PM 28° Partly Cloudy 3% 10 mph NNE 66%
6 PM 27° Partly Cloudy 3% 9 mph NNE 69%
7 PM 27° Partly Cloudy 3% 9 mph NNE 71%
15-Day Forecast
Today
7/21
Clear
14%
20°
35°
Wed
7/22
Mostly Clear
3%
19°
30°
Thu
7/23
Clear
3%
17°
27°
Fri
7/24
Mostly Cloudy
44%
17°
24°
Sat
7/25
Partly Cloudy
45%
18°
30°
Sun
7/26
Clear
17%
23°
34°
Mon
7/27
Clear
17%
24°
34°
Tue
7/28
Rain
18%
21°
32°
Wed
7/29
Drizzle
44%
19°
30°
Thu
7/30
Drizzle
44%
16°
29°
Fri
7/31
Drizzle
60%
17°
29°
Sat
8/1
Clear
60%
19°
30°
Sun
8/2
Clear
60%
20°
31°
Mon
8/3
Drizzle
60%
20°
31°
Tue
8/4
Drizzle
60%
21°
31°
49
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
49 AQI 8.8 µg/m³
O3
Ground-level ozone
32 AQI 36 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Today 49 Good 32 49
Thu 28 Good 28 26
Fri 31 Good 31 16
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 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE1945 J/kg
MLCAPE1927 J/kg
MUCAPE2746 J/kg
SBCIN-130 J/kg
MLCIN0 J/kg
Lifted Index-2.5
Kinematics
0–6 km Shear38 kt
0–1 km Shear10 kt
Eff. Shear41 kt
0–1 km SRH-76
0–3 km SRH-88
Eff. SRH-88
Storm Motion279° @ 30 kt
0–1 km EHI-0.9
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index16.7
Thermo & Levels
PWAT1.80 in
0–3 km LR5.1 °C/km
700–500 LR5.5 °C/km
Total Totals42.7
LCL937 hPa
LFC832 hPa
EL147 hPa
Freezing Lvl17,789 ft