Extreme Heat Warning — Stewart, TN, Montgomery, TN, Robertson, TN, Sumner, TN, Houston, TN, Humphreys, TN, Dickson, TN, Cheatham, TN, Davidson, TN, Wilson, TN, Trousdale, TN, Smith, TN, Perry, TN, Hickman, TN, Lewis, TN, Williamson, TN, Maury, TN, Marshall, TN, Rutherford, TN, Cannon, TN, De Kalb, TN, Bedford, TN, Wayne, TN, Lawrence, TN, Giles, TN 7:00 PM

Williamson County, Middle Tennessee, Tennessee, United States

Last updated: 2:56 PM CDT  ·  Refresh
34°C
Feels like 41°
Mostly Clear
▲ 35°  /  ▼ 23°
Wind
5 mph WSW
Humidity
55%
Dew Point
23°
Pressure
29.24 inHg
Visibility
10 mi
UV Index
8.5
Cloud Cover
24%
Sunrise
6:05 AM
Sunset
7:38 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Williamson County is currently mostly clear at 34°C. Dry conditions are expected through the next 24 hours. Atmospheric instability is elevated (CAPE up to 2793 J/kg) — isolated convective development possible. Sunrise: 6:05AM · Sunset: 7:38PM.

Alerts

Extreme Heat Warning
Stewart, TN, Montgomery, TN, Robertson, TN, Sumner, TN, Houston, TN, Humphreys, TN, Dickson, TN, Cheatham, TN, Davidson, TN, Wilson, TN, Trousdale, TN, Smith, TN, Perry, TN, Hickman, TN, Lewis, TN, Williamson, TN, Maury, TN, Marshall, TN, Rutherford, TN, Cannon, TN, De Kalb, TN, Bedford, TN, Wayne, TN, Lawrence, TN, Giles, TN
Expires 7:00 PM
33 AQI · Good Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
34°
21%
3 PM
35°
40%
4 PM
34°
23%
5 PM
33°
22%
6 PM
32°
3%
7 PM
31°
3%
8 PM
29°
3%
9 PM
28°
3%
10 PM
28°
3%
11 PM
27°
3%
12 AM
26°
3%
1 AM
26°
3%
2 AM
26°
3%
3 AM
26°
3%
4 AM
24°
3%
5 AM
24°
3%
6 AM
24°
3%
7 AM
25°
3%
8 AM
28°
3%
9 AM
30°
3%
10 AM
31°
3%
11 AM
32°
3%
12 PM
33°
3%
1 PM
33°
3%
7-Day Forecast
Today
35° 23°
Partly Cloudy with a 22% chance of rain.
Sat
37° 24°
Clear.
Sun
38° 22°
Clear.
Mon
34° 24°
Partly Cloudy with a 38% chance of rain.
Tue
34° 22°
Clear.
Wed
36° 22°
Thunderstorm, 60% chance.
Thu
32° 20°
Drizzle, 60% chance.
TimeTempConditionsPrecipWindHumidity
Now 34° Mostly Clear 21% 5 mph WSW 55%
3 PM 35° Heavy Rain 40% 5 mph SW 57%
4 PM 34° Rain 23% 4 mph S 60%
5 PM 33° Partly Cloudy 22% 6 mph S 62%
6 PM 32° Partly Cloudy 3% 7 mph SSW 69%
7 PM 31° Partly Cloudy 3% 5 mph SSW 72%
8 PM 29° Partly Cloudy 3% 4 mph SSW 74%
9 PM 28° Partly Cloudy 3% 4 mph SSW 77%
10 PM 28° Partly Cloudy 3% 3 mph S 78%
11 PM 27° Mostly Clear 3% 4 mph S 80%
12 AM 26° Clear 3% 4 mph S 81%
1 AM 26° Mostly Clear 3% 4 mph S 82%
2 AM 26° Mostly Clear 3% 4 mph S 82%
3 AM 26° Mostly Clear 3% 4 mph SSW 82%
4 AM 24° Mostly Clear 3% 4 mph SSW 83%
5 AM 24° Mostly Clear 3% 4 mph S 84%
6 AM 24° Clear 3% 4 mph SSW 85%
7 AM 25° Clear 3% 5 mph SSW 77%
8 AM 28° Mostly Clear 3% 5 mph SW 70%
9 AM 30° Mostly Clear 3% 6 mph SW 65%
10 AM 31° Clear 3% 6 mph WSW 61%
11 AM 32° Clear 3% 6 mph WSW 56%
12 PM 33° Clear 3% 6 mph WSW 52%
1 PM 33° Clear 3% 6 mph WSW 51%
15-Day Forecast
Today
8/14
Partly Cloudy
22%
23°
35°
Sat
8/15
Clear
3%
24°
37°
Sun
8/16
Clear
12%
22°
38°
Mon
8/17
Partly Cloudy
38%
24°
34°
Tue
8/18
Clear
19%
22°
34°
Wed
8/19
Thunderstorm
60%
22°
36°
Thu
8/20
Drizzle
60%
20°
32°
Fri
8/21
Drizzle
60%
18°
31°
Sat
8/22
Drizzle
60%
16°
31°
Sun
8/23
Drizzle
60%
16°
32°
Mon
8/24
Clear
25%
18°
32°
Tue
8/25
Drizzle
60%
21°
33°
Wed
8/26
Drizzle
60%
22°
33°
Thu
8/27
Drizzle
60%
22°
33°
Fri
8/28
Drizzle
60%
21°
33°
33
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
33 AQI 6.0 µg/m³
O3
Ground-level ozone
27 AQI 30 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Sat 33 Good 27 33
Sun 48 Good 33 48
Mon 46 Good 35 46
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, 18:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE3672 J/kg
MLCAPE2806 J/kg
MUCAPE3672 J/kg
SBCIN0 J/kg
MLCIN-7 J/kg
Lifted Index-6.6
Kinematics
0–6 km Shear8 kt
0–1 km Shear5 kt
Eff. Shear11 kt
0–1 km SRH15
0–3 km SRH24
Eff. SRH24
Storm Motion49° @ 7 kt
0–1 km EHI0.3
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index31.9
Thermo & Levels
PWAT2.03 in
0–3 km LR8.0 °C/km
700–500 LR5.4 °C/km
Total Totals47.1
LCL847 hPa
LFC990 hPa
EL129 hPa
Freezing Lvl16,404 ft