Excessive Heat Warning — Perry, MO, Bollinger, MO, Cape Girardeau, MO, Wayne, MO, Carter, MO, Ripley, MO, Butler, MO, Stoddard, MO, Scott, MO, Mississippi, MO, New Madrid, MO, 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 7:00 PM Heat Advisory — Perry, MO, Bollinger, MO, Cape Girardeau, MO, Wayne, MO, Carter, MO, Ripley, MO, Butler, MO, Stoddard, MO, Scott, MO, Mississippi, MO, New Madrid, MO, 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 7:00 PM

Lyon County, Kentucky, United States

Last updated: 12:14 PM CDT  ·  Refresh
31°C
Feels like 38°
Mostly Cloudy
▲ 36°  /  ▼ 22°
Wind
3 mph SW
Humidity
76%
Dew Point
26°
Pressure
29.51 inHg
Visibility
9 mi
UV Index
7.4
Cloud Cover
67%
Sunrise
5:52 AM
Sunset
8:04 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Lyon County is currently mostly cloudy at 30°C. Precipitation is likely — peak probability 65% around 1 AM. Atmospheric instability is elevated (CAPE up to 4150 J/kg) — isolated convective development possible. Sunrise: 5:52AM · Sunset: 8:04PM.

Alerts

Excessive Heat Warning
Perry, MO, Bollinger, MO, Cape Girardeau, MO, Wayne, MO, Carter, MO, Ripley, MO, Butler, MO, Stoddard, MO, Scott, MO, Mississippi, MO, New Madrid, MO, 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
Expires 7:00 PM
Heat Advisory
Perry, MO, Bollinger, MO, Cape Girardeau, MO, Wayne, MO, Carter, MO, Ripley, MO, Butler, MO, Stoddard, MO, Scott, MO, Mississippi, MO, New Madrid, MO, 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
Expires 7:00 PM
41 AQI · Good Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
31°
3%
1 PM
33°
16%
2 PM
33°
18%
3 PM
34°
22%
4 PM
34°
32%
5 PM
34°
32%
6 PM
33°
34%
7 PM
33°
44%
8 PM
32°
49%
9 PM
29°
40%
10 PM
29°
53%
11 PM
28°
59%
12 AM
27°
59%
1 AM
26°
64%
2 AM
25°
51%
3 AM
24°
56%
4 AM
24°
47%
5 AM
23°
47%
6 AM
23°
32%
7 AM
24°
16%
8 AM
26°
5%
9 AM
26°
5%
10 AM
27°
3%
11 AM
28°
3%
7-Day Forecast
Today
36° 22°
Partly Cloudy with a 40% chance of rain.
Mon
36° 22°
Partly Cloudy with a 59% chance of rain.
Tue
37° 23°
Mostly Clear with a 49% chance of rain.
Wed
31° 21°
Mostly Clear with a 29% chance of rain.
Thu
32° 18°
Clear.
Fri
29° 19°
Drizzle, 60% chance.
Sat
31° 18°
Rain, 81% chance.
TimeTempConditionsPrecipWindHumidity
Now 31° Mostly Cloudy 3% 3 mph SW 76%
1 PM 33° Overcast 16% 4 mph SW 70%
2 PM 33° Overcast 18% 5 mph WSW 68%
3 PM 34° Mostly Cloudy 22% 5 mph WSW 66%
4 PM 34° Mostly Cloudy 32% 5 mph WSW 65%
5 PM 34° Mostly Clear 32% 5 mph WSW 69%
6 PM 33° Mostly Clear 34% 5 mph WSW 72%
7 PM 33° Clear 44% 4 mph WSW 76%
8 PM 32° Mostly Clear 49% 4 mph SW 80%
9 PM 29° Mostly Cloudy 40% 5 mph SSW 82%
10 PM 29° Mostly Cloudy 53% 4 mph SSW 84%
11 PM 28° Mostly Cloudy 59% 5 mph S 84%
12 AM 27° Rain 59% 7 mph SE 84%
1 AM 26° Rain 64% 9 mph E 85%
2 AM 25° Rain 51% 7 mph E 88%
3 AM 24° Drizzle 56% 5 mph E 92%
4 AM 24° Overcast 47% 4 mph E 94%
5 AM 23° Overcast 47% 3 mph S 94%
6 AM 23° Mostly Cloudy 32% 4 mph SSW 94%
7 AM 24° Mostly Cloudy 16% 6 mph SSW 92%
8 AM 26° Partly Cloudy 5% 6 mph SSW 86%
9 AM 26° Partly Cloudy 5% 6 mph S 81%
10 AM 27° Partly Cloudy 3% 5 mph S 77%
11 AM 28° Partly Cloudy 3% 5 mph SSW 74%
15-Day Forecast
Today
7/26
Partly Cloudy
40%
22°
36°
Mon
7/27
Partly Cloudy
59%
22°
36°
Tue
7/28
Mostly Clear
49%
23°
37°
Wed
7/29
Mostly Clear
29%
21°
31°
Thu
7/30
Clear
9%
18°
32°
Fri
7/31
Drizzle
60%
19°
29°
Sat
8/1
Rain
81%
18°
31°
Sun
8/2
Drizzle
60%
20°
31°
Mon
8/3
Drizzle
60%
20°
31°
Tue
8/4
Drizzle
60%
21°
33°
Wed
8/5
Drizzle
60%
22°
33°
Thu
8/6
Drizzle
60%
22°
33°
Fri
8/7
Drizzle
60%
21°
32°
Sat
8/8
Drizzle
60%
21°
33°
Sun
8/9
Drizzle
60%
21°
33°
41
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
41 AQI 7.4 µg/m³
O3
Ground-level ozone
38 AQI 42 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Mon 41 Good 38 41
Tue 49 Good 36 49
Wed 41 Good 41 38
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 Sun Jul 26, 16:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE4702 J/kg
MLCAPE3093 J/kg
MUCAPE4702 J/kg
SBCIN0 J/kg
MLCIN0 J/kg
Lifted Index-7.4
Kinematics
0–6 km Shear24 kt
0–1 km Shear4 kt
Eff. Shear30 kt
0–1 km SRH2
0–3 km SRH-45
Eff. SRH-45
Storm Motion300° @ 20 kt
0–1 km EHI0.1
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index26.3
Thermo & Levels
PWAT1.74 in
0–3 km LR6.2 °C/km
700–500 LR5.5 °C/km
Total Totals45.8
LCL940 hPa
LFC999 hPa
EL128 hPa
Freezing Lvl16,749 ft