Excessive 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

McLean County, Kentucky, United States

Last updated: 2:26 AM CDT  ·  Refresh
24°C
Feels like 28°
Clear
▲ 38°  /  ▼ 23°
Wind
2 mph SSW
Humidity
82%
Dew Point
22°
Pressure
29.54 inHg
Visibility
10 mi
UV Index
0.0
Cloud Cover
2%
Sunrise
6:21 AM
Sunset
7:13 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: McLean County is currently clear at 25°C. Dry conditions are expected through the next 24 hours. Atmospheric instability is elevated (CAPE up to 2118 J/kg) — isolated convective development possible. Sunrise: 6:21AM · Sunset: 7:13PM.

Alerts

Excessive 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
56 AQI · Moderate Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
24°
13%
3 AM
24°
4%
4 AM
24°
4%
5 AM
22°
4%
6 AM
22°
4%
7 AM
23°
4%
8 AM
26°
4%
9 AM
30°
9%
10 AM
32°
9%
11 AM
34°
9%
12 PM
34°
8%
1 PM
37°
8%
2 PM
37°
10%
3 PM
37°
10%
4 PM
37°
19%
5 PM
37°
14%
6 PM
36°
18%
7 PM
34°
18%
8 PM
33°
18%
9 PM
28°
25%
10 PM
27°
15%
11 PM
27°
15%
12 AM
27°
16%
1 AM
27°
16%
7-Day Forecast
Today
38° 23°
Clear.
Sat
39° 23°
Partly Cloudy with a 61% chance of rain.
Sun
36° 18°
Partly Cloudy with a 22% chance of rain.
Mon
33° 13°
Mostly Clear.
Tue
38° 19°
Clear.
Wed
40° 21°
Clear.
Thu
38° 20°
Rain, 28% chance.
TimeTempConditionsPrecipWindHumidity
Now 24° Clear 13% 2 mph SSW 82%
3 AM 24° Clear 4% 2 mph SW 83%
4 AM 24° Clear 4% 2 mph SSW 84%
5 AM 22° Clear 4% 2 mph S 83%
6 AM 22° Clear 4% 3 mph S 84%
7 AM 23° Clear 4% 3 mph S 80%
8 AM 26° Clear 4% 2 mph S 71%
9 AM 30° Clear 9% 3 mph SSW 61%
10 AM 32° Clear 9% 3 mph SW 54%
11 AM 34° Clear 9% 3 mph SW 48%
12 PM 34° Clear 8% 4 mph SW 44%
1 PM 37° Clear 8% 4 mph SW 41%
2 PM 37° Mostly Clear 10% 4 mph SW 40%
3 PM 37° Mostly Clear 10% 4 mph SW 40%
4 PM 37° Mostly Clear 19% 4 mph SW 42%
5 PM 37° Mostly Clear 14% 4 mph SSW 47%
6 PM 36° Clear 18% 4 mph SSW 52%
7 PM 34° Clear 18% 4 mph SSW 58%
8 PM 33° Clear 18% 4 mph SSW 62%
9 PM 28° Clear 25% 3 mph SSW 66%
10 PM 27° Clear 15% 3 mph SSW 69%
11 PM 27° Clear 15% 3 mph SSW 71%
12 AM 27° Clear 16% 4 mph SSW 73%
1 AM 27° Clear 16% 4 mph SSW 75%
15-Day Forecast
Today
9/4
Clear
18%
23°
38°
Sat
9/5
Partly Cloudy
61%
23°
39°
Sun
9/6
Partly Cloudy
22%
18°
36°
Mon
9/7
Mostly Clear
3%
13°
33°
Tue
9/8
Clear
8%
19°
38°
Wed
9/9
Clear
17%
21°
40°
Thu
9/10
Rain
28%
20°
38°
Fri
9/11
Rain
69%
16°
36°
Sat
9/12
Drizzle
68%
20°
40°
Sun
9/13
Drizzle
51%
17°
36°
Mon
9/14
Clear
60%
20°
37°
Tue
9/15
Drizzle
60%
21°
37°
Wed
9/16
Clear
60%
21°
37°
Thu
9/17
Drizzle
60%
19°
34°
Fri
9/18
Clear
25%
18°
34°
56
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
56 AQI 11.9 µg/m³
O3
Ground-level ozone
47 AQI 52 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Today 56 Moderate 47 56
Sat 58 Moderate 45 58
Sun 56 Moderate 54 56
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 Sep 4, 06:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE540 J/kg
MLCAPE518 J/kg
MUCAPE678 J/kg
SBCIN-418 J/kg
MLCIN-218 J/kg
Lifted Index-1.6
Kinematics
0–6 km Shear6 kt
0–1 km Shear8 kt
Eff. Shear9 kt
0–1 km SRH23
0–3 km SRH50
Eff. SRH56
Storm Motion347° @ 11 kt
0–1 km EHI0.1
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index32.4
Thermo & Levels
PWAT1.65 in
0–3 km LR4.7 °C/km
700–500 LR5.4 °C/km
Total Totals47.0
LCL967 hPa
LFC717 hPa
EL244 hPa
Freezing Lvl16,214 ft