Heat Advisory — 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 7:00 PM

McLean County, Kentucky, United States

Last updated: 6:24 AM CDT  ·  Refresh
22°C
Feels like 23°
Clear
▲ 36°  /  ▼ 21°
Wind
4 mph SSW
Humidity
74%
Dew Point
18°
Pressure
29.51 inHg
Visibility
10 mi
UV Index
0.0
Cloud Cover
5%
Sunrise
6:35 AM
Sunset
6:48 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: McLean County is currently clear at 22°C. Dry conditions are expected through the next 24 hours. Atmospheric instability is elevated (CAPE up to 641 J/kg) — isolated convective development possible. Sunrise: 6:35AM · Sunset: 6:48PM.

Alerts

Heat Advisory
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 7:00 PM
61 AQI · Moderate Dominant: O3 Air Quality
Hourly Forecast · Next 24 Hours
Now
22°
11%
7 AM
21°
21%
8 AM
24°
21%
9 AM
27°
14%
10 AM
29°
7%
11 AM
31°
7%
12 PM
32°
3%
1 PM
34°
3%
2 PM
35°
3%
3 PM
35°
3%
4 PM
35°
4%
5 PM
34°
4%
6 PM
32°
5%
7 PM
31°
5%
8 PM
29°
5%
9 PM
27°
8%
10 PM
26°
13%
11 PM
26°
13%
12 AM
26°
13%
1 AM
24°
17%
2 AM
24°
17%
3 AM
24°
5%
4 AM
23°
5%
5 AM
22°
7%
7-Day Forecast
Today
36° 21°
Mostly Cloudy.
Mon
32° 18°
Partly Cloudy with a 55% chance of rain.
Tue
27° 16°
Overcast with a 28% chance of rain.
Wed
27° 13°
Mostly Cloudy.
Thu
28° 12°
Mostly Cloudy.
Fri
28° 11°
Mostly Cloudy.
Sat
28° 11°
Overcast.
TimeTempConditionsPrecipWindHumidity
Now 22° Clear 11% 4 mph SSW 74%
7 AM 21° Mostly Clear 21% 5 mph SSW 73%
8 AM 24° Mostly Clear 21% 6 mph SW 65%
9 AM 27° Partly Cloudy 14% 8 mph SW 54%
10 AM 29° Mostly Cloudy 7% 9 mph SW 46%
11 AM 31° Overcast 7% 10 mph WSW 44%
12 PM 32° Overcast 3% 10 mph WSW 43%
1 PM 34° Overcast 3% 10 mph WSW 40%
2 PM 35° Overcast 3% 10 mph WSW 37%
3 PM 35° Overcast 3% 10 mph WSW 34%
4 PM 35° Mostly Cloudy 4% 10 mph WSW 30%
5 PM 34° Mostly Cloudy 4% 8 mph WSW 33%
6 PM 32° Partly Cloudy 5% 6 mph WSW 37%
7 PM 31° Mostly Clear 5% 5 mph WSW 40%
8 PM 29° Partly Cloudy 5% 4 mph SW 42%
9 PM 27° Mostly Clear 8% 4 mph SW 44%
10 PM 26° Partly Cloudy 13% 4 mph SW 46%
11 PM 26° Partly Cloudy 13% 3 mph SW 47%
12 AM 26° Partly Cloudy 13% 4 mph SW 49%
1 AM 24° Rain 17% 4 mph SW 57%
2 AM 24° Partly Cloudy 17% 4 mph WSW 60%
3 AM 24° Partly Cloudy 5% 4 mph W 63%
4 AM 23° Partly Cloudy 5% 4 mph NW 68%
5 AM 22° Mostly Cloudy 7% 4 mph NNE 74%
15-Day Forecast
Today
9/20
Mostly Cloudy
14%
21°
36°
Mon
9/21
Partly Cloudy
55%
18°
32°
Tue
9/22
Overcast
28%
16°
27°
Wed
9/23
Mostly Cloudy
13%
13°
27°
Thu
9/24
Mostly Cloudy
9%
12°
28°
Fri
9/25
Mostly Cloudy
7%
11°
28°
Sat
9/26
Overcast
8%
11°
28°
Sun
9/27
Mostly Clear
5%
12°
29°
Mon
9/28
Clear
35%
12°
31°
Tue
9/29
Drizzle
45%
16°
30°
Wed
9/30
Drizzle
60%
15°
31°
Thu
10/1
Drizzle
60%
14°
29°
Fri
10/2
Drizzle
60%
14°
29°
Sat
10/3
Drizzle
60%
14°
29°
Sun
10/4
Clear
25%
14°
29°
61
Moderate
U.S. Air Quality Index · Dominant: O3
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
57 AQI 12.2 µg/m³
O3
Ground-level ozone
Dominant
61 AQI 58 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Today 61 Moderate 61 57
Mon 51 Moderate 40 51
Tue 46 Good 46 43
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 LCL0°C Temperature (°C) Pressure (hPa)
Temp Dewpoint Parcel (SB) CAPE CIN Dry adiabat Moist adiabat Mixing ratio
RAP
Valid Sun Sep 20, 10:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE0 J/kg
MLCAPE63 J/kg
MUCAPE154 J/kg
SBCIN—
MLCIN-428 J/kg
Lifted Index2.4
Kinematics
0–6 km Shear25 kt
0–1 km Shear14 kt
Eff. Shear10 kt
0–1 km SRH55
0–3 km SRH65
Eff. SRH22
Storm Motion306° @ 19 kt
0–1 km EHI0.0
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index17.3
Thermo & Levels
PWAT1.27 in
0–3 km LR4.3 °C/km
700–500 LR6.1 °C/km
Total Totals43.8
LCL942 hPa
LFC—
EL—
Freezing Lvl15,653 ft