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

Lyon County, Kentucky, United States

Last updated: 2:25 AM CDT  ·  Refresh
26°C
Feels like 29°
Clear
▲ 37°  /  ▼ 23°
Wind
3 mph SSE
Humidity
80%
Dew Point
22°
Pressure
29.50 inHg
Visibility
10 mi
UV Index
0.0
Cloud Cover
1%
Sunrise
6:25 AM
Sunset
7:16 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Lyon County is currently clear at 25°C. Dry conditions are expected through the next 24 hours. Atmospheric instability is elevated (CAPE up to 2000 J/kg) — isolated convective development possible. Sunrise: 6:25AM · Sunset: 7:16PM.

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
52 AQI · Moderate Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
26°
16%
3 AM
25°
7%
4 AM
24°
4%
5 AM
23°
4%
6 AM
23°
4%
7 AM
24°
4%
8 AM
27°
4%
9 AM
29°
4%
10 AM
31°
3%
11 AM
33°
3%
12 PM
33°
3%
1 PM
36°
5%
2 PM
36°
13%
3 PM
36°
15%
4 PM
36°
15%
5 PM
36°
5%
6 PM
34°
5%
7 PM
33°
5%
8 PM
32°
9%
9 PM
28°
9%
10 PM
27°
9%
11 PM
27°
9%
12 AM
26°
9%
1 AM
27°
9%
7-Day Forecast
Today
37° 23°
Clear.
Sat
38° 23°
Mostly Clear with a 54% chance of rain.
Sun
36° 19°
Clear with a 23% chance of rain.
Mon
32° 16°
Mostly Clear.
Tue
37° 20°
Clear.
Wed
39° 22°
Clear.
Thu
37° 21°
Rain.
TimeTempConditionsPrecipWindHumidity
Now 26° Clear 16% 3 mph SSE 80%
3 AM 25° Clear 7% 4 mph SSE 83%
4 AM 24° Clear 4% 3 mph SSE 84%
5 AM 23° Clear 4% 3 mph S 85%
6 AM 23° Clear 4% 2 mph S 86%
7 AM 24° Clear 4% 2 mph SSW 84%
8 AM 27° Clear 4% 2 mph SSW 74%
9 AM 29° Clear 4% 3 mph SW 64%
10 AM 31° Clear 3% 3 mph SW 57%
11 AM 33° Clear 3% 4 mph SW 52%
12 PM 33° Clear 3% 3 mph SW 48%
1 PM 36° Clear 5% 3 mph WSW 45%
2 PM 36° Clear 13% 3 mph WSW 45%
3 PM 36° Clear 15% 3 mph WSW 45%
4 PM 36° Clear 15% 3 mph WSW 46%
5 PM 36° Clear 5% 3 mph SW 49%
6 PM 34° Clear 5% 4 mph SE 53%
7 PM 33° Clear 5% 4 mph SE 57%
8 PM 32° Clear 9% 4 mph SE 60%
9 PM 28° Clear 9% 5 mph SSE 63%
10 PM 27° Clear 9% 5 mph SSE 65%
11 PM 27° Clear 9% 4 mph SE 65%
12 AM 26° Clear 9% 4 mph SE 66%
1 AM 27° Clear 9% 4 mph SE 67%
15-Day Forecast
Today
9/4
Clear
16%
23°
37°
Sat
9/5
Mostly Clear
54%
23°
38°
Sun
9/6
Clear
23%
19°
36°
Mon
9/7
Mostly Clear
3%
16°
32°
Tue
9/8
Clear
3%
20°
37°
Wed
9/9
Clear
17%
22°
39°
Thu
9/10
Rain
19%
21°
37°
Fri
9/11
Drizzle
43%
18°
37°
Sat
9/12
Rain
44%
21°
41°
Sun
9/13
Drizzle
51%
19°
37°
Mon
9/14
Clear
25%
20°
36°
Tue
9/15
Clear
60%
21°
36°
Wed
9/16
Drizzle
60%
21°
36°
Thu
9/17
Drizzle
60%
19°
33°
Fri
9/18
Clear
25%
19°
33°
52
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
52 AQI 9.7 µg/m³
O3
Ground-level ozone
41 AQI 44 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Today 52 Moderate 41 52
Sat 56 Moderate 44 56
Sun 55 Moderate 49 55
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
SBCAPE572 J/kg
MLCAPE760 J/kg
MUCAPE858 J/kg
SBCIN-394 J/kg
MLCIN-169 J/kg
Lifted Index-0.8
Kinematics
0–6 km Shear4 kt
0–1 km Shear7 kt
Eff. Shear2 kt
0–1 km SRH18
0–3 km SRH15
Eff. SRH14
Storm Motion329° @ 9 kt
0–1 km EHI0.1
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index32.6
Thermo & Levels
PWAT1.65 in
0–3 km LR5.1 °C/km
700–500 LR5.0 °C/km
Total Totals44.4
LCL953 hPa
LFC721 hPa
EL247 hPa
Freezing Lvl16,555 ft