Extreme Heat Warning — Jefferson, IL, Wayne, IL, Edwards, IL, Wabash, IL, Perry, IL, Franklin, IL, Hamilton, IL, White, IL, Jackson, IL, Williamson, IL, Saline, IL, Gallatin, IL, Union, IL, Johnson, IL, Pope, IL, Hardin, IL, Alexander, IL, Pulaski, IL, Massac, IL, Gibson, IN, Pike, IN, Posey, IN, Vanderburgh, IN, Warrick, IN, Spencer, IN, Fulton, KY, Hickman, KY, Carlisle, KY, Ballard, KY, McCracken, KY, Graves, KY, Livingston, KY, Marshall, KY, Calloway, KY, Crittenden, KY, Lyon, KY, Trigg, KY, Caldwell, KY, Union, KY, Webster, KY, Hopkins, KY, Christian, KY, Henderson, KY, Daviess, KY, McLean, KY, Muhlenberg, KY, Todd, 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 8:00 PM

Mount Vernon, Illinois

Last updated: 2:00 PM CDT  ·  Refresh
33°C
Feels like 38°
Clear
▲ 35°  /  ▼ 24°
Wind
6 mph SSE
Humidity
57%
Dew Point
23°
Pressure
29.52 inHg
Visibility
10 mi
UV Index
9.2
Cloud Cover
8%
Sunrise
6:09 AM
Sunset
7:50 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Mount Vernon is currently clear at 33°C. Dry conditions are expected through the next 24 hours. Atmospheric instability is elevated (CAPE up to 2634 J/kg) — isolated convective development possible. Sunrise: 6:09AM · Sunset: 7:50PM.

Alerts

Extreme Heat Warning
Jefferson, IL, Wayne, IL, Edwards, IL, Wabash, IL, Perry, IL, Franklin, IL, Hamilton, IL, White, IL, Jackson, IL, Williamson, IL, Saline, IL, Gallatin, IL, Union, IL, Johnson, IL, Pope, IL, Hardin, IL, Alexander, IL, Pulaski, IL, Massac, IL, Gibson, IN, Pike, IN, Posey, IN, Vanderburgh, IN, Warrick, IN, Spencer, IN, Fulton, KY, Hickman, KY, Carlisle, KY, Ballard, KY, McCracken, KY, Graves, KY, Livingston, KY, Marshall, KY, Calloway, KY, Crittenden, KY, Lyon, KY, Trigg, KY, Caldwell, KY, Union, KY, Webster, KY, Hopkins, KY, Christian, KY, Henderson, KY, Daviess, KY, McLean, KY, Muhlenberg, KY, Todd, 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 8:00 PM
42 AQI · Good Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
33°
7%
3 PM
33°
3%
4 PM
34°
4%
5 PM
35°
7%
6 PM
34°
5%
7 PM
33°
5%
8 PM
32°
5%
9 PM
29°
5%
10 PM
28°
5%
11 PM
28°
5%
12 AM
27°
8%
1 AM
26°
9%
2 AM
26°
9%
3 AM
26°
5%
4 AM
25°
5%
5 AM
25°
5%
6 AM
24°
5%
7 AM
24°
5%
8 AM
26°
8%
9 AM
27°
16%
10 AM
28°
13%
11 AM
29°
13%
12 PM
30°
12%
1 PM
33°
13%
7-Day Forecast
Today
35° 24°
Clear.
Sat
36° 24°
Mostly Clear.
Sun
33° 24°
Partly Cloudy with a 54% chance of rain.
Mon
29° 22°
Mostly Cloudy with a 55% chance of rain.
Tue
32° 21°
Clear.
Wed
34° 21°
Drizzle, 60% chance.
Thu
29° 19°
Clear with a 25% chance of rain.
TimeTempConditionsPrecipWindHumidity
Now 33° Clear 7% 6 mph SSE 57%
3 PM 33° Clear 3% 7 mph S 56%
4 PM 34° Clear 4% 7 mph SSW 54%
5 PM 35° Clear 7% 7 mph SSW 56%
6 PM 34° Clear 5% 6 mph SSW 58%
7 PM 33° Clear 5% 5 mph S 64%
8 PM 32° Clear 5% 4 mph S 68%
9 PM 29° Clear 5% 4 mph SE 72%
10 PM 28° Clear 5% 4 mph ESE 75%
11 PM 28° Clear 5% 5 mph ESE 76%
12 AM 27° Clear 8% 5 mph SE 77%
1 AM 26° Clear 9% 5 mph SE 79%
2 AM 26° Clear 9% 5 mph SE 80%
3 AM 26° Clear 5% 6 mph SSE 81%
4 AM 25° Partly Cloudy 5% 6 mph SSE 82%
5 AM 25° Partly Cloudy 5% 6 mph S 82%
6 AM 24° Partly Cloudy 5% 6 mph S 82%
7 AM 24° Partly Cloudy 5% 6 mph S 82%
8 AM 26° Partly Cloudy 8% 6 mph SW 76%
9 AM 27° Partly Cloudy 16% 7 mph W 75%
10 AM 28° Partly Cloudy 13% 8 mph W 71%
11 AM 29° Partly Cloudy 13% 8 mph WSW 67%
12 PM 30° Partly Cloudy 12% 8 mph SW 62%
1 PM 33° Mostly Clear 13% 10 mph SW 57%
15-Day Forecast
Today
8/14
Clear
7%
24°
35°
Sat
8/15
Mostly Clear
13%
24°
36°
Sun
8/16
Partly Cloudy
54%
24°
33°
Mon
8/17
Mostly Cloudy
55%
22°
29°
Tue
8/18
Clear
19%
21°
32°
Wed
8/19
Drizzle
60%
21°
34°
Thu
8/20
Clear
25%
19°
29°
Fri
8/21
Clear
60%
16°
29°
Sat
8/22
Drizzle
60%
14°
29°
Sun
8/23
Clear
60%
15°
31°
Mon
8/24
Clear
25%
17°
32°
Tue
8/25
Drizzle
60%
19°
31°
Wed
8/26
Clear
60%
19°
32°
Thu
8/27
Clear
60%
19°
31°
Fri
8/28
Drizzle
60%
19°
31°
42
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
42 AQI 7.6 µg/m³
O3
Ground-level ozone
34 AQI 38 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Sat 42 Good 34 42
Sun 53 Moderate 38 53
Mon 54 Moderate 39 54
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 Fri Aug 14, 17:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE3094 J/kg
MLCAPE1788 J/kg
MUCAPE3094 J/kg
SBCIN-12 J/kg
MLCIN-62 J/kg
Lifted Index-6.9
Kinematics
0–6 km Shear29 kt
0–1 km Shear3 kt
Eff. Shear22 kt
0–1 km SRH0
0–3 km SRH2
Eff. SRH2
Storm Motion319° @ 16 kt
0–1 km EHI0.0
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.1
K-Index36.3
Thermo & Levels
PWAT2.08 in
0–3 km LR7.3 °C/km
700–500 LR6.0 °C/km
Total Totals47.5
LCL871 hPa
LFC817 hPa
EL140 hPa
Freezing Lvl15,725 ft