Heat Advisory — 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, Rutherford, TN 9:00 PM

Williamson County, Middle Tennessee, Tennessee, United States

Last updated: 6:17 AM CDT  ·  Refresh
23°C
Feels like 27°
Mostly Clear
▲ 34°  /  ▼ 23°
Wind
4 mph SSW
Humidity
91%
Dew Point
22°
Pressure
29.26 inHg
Visibility
9 mi
UV Index
1.2
Cloud Cover
16%
Sunrise
6:03 AM
Sunset
7:41 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Williamson County is currently mostly clear at 23°C. Dry conditions are expected through the next 24 hours. Atmospheric instability is elevated (CAPE up to 3280 J/kg) — isolated convective development possible. Sunrise: 6:03AM · Sunset: 7:41PM.

Alerts

Heat Advisory
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, Rutherford, TN
Expires 9:00 PM
32 AQI · Good Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
23°
17%
7 AM
23°
33%
8 AM
24°
33%
9 AM
28°
28%
10 AM
29°
25%
11 AM
31°
19%
12 PM
32°
17%
1 PM
34°
17%
2 PM
34°
18%
3 PM
34°
18%
4 PM
34°
21%
5 PM
33°
21%
6 PM
32°
21%
7 PM
31°
22%
8 PM
29°
22%
9 PM
27°
23%
10 PM
26°
20%
11 PM
26°
20%
12 AM
25°
21%
1 AM
24°
5%
2 AM
24°
8%
3 AM
24°
9%
4 AM
24°
9%
5 AM
23°
9%
7-Day Forecast
Today
34° 23°
Mostly Clear with a 28% chance of rain.
Wed
36° 23°
Partly Cloudy with a 37% chance of rain.
Thu
37° 23°
Mostly Cloudy with a 37% chance of rain.
Fri
36° 23°
Clear.
Sat
37° 24°
Clear.
Sun
37° 24°
Rain, 50% chance.
Mon
36° 23°
Rain, 62% chance.
TimeTempConditionsPrecipWindHumidity
Now 23° Mostly Clear 17% 4 mph SSW 91%
7 AM 23° Clear 33% 6 mph SSW 87%
8 AM 24° Mostly Clear 33% 6 mph SW 83%
9 AM 28° Mostly Clear 28% 7 mph SW 78%
10 AM 29° Mostly Clear 25% 7 mph SW 73%
11 AM 31° Mostly Clear 19% 7 mph WSW 69%
12 PM 32° Clear 17% 7 mph WSW 64%
1 PM 34° Clear 17% 8 mph SW 60%
2 PM 34° Mostly Clear 18% 8 mph SW 60%
3 PM 34° Mostly Clear 18% 8 mph SW 60%
4 PM 34° Mostly Clear 21% 8 mph SW 61%
5 PM 33° Mostly Clear 21% 7 mph SW 65%
6 PM 32° Mostly Clear 21% 7 mph SW 70%
7 PM 31° Mostly Clear 22% 6 mph SW 74%
8 PM 29° Mostly Clear 22% 6 mph SSW 75%
9 PM 27° Mostly Clear 23% 6 mph SSW 76%
10 PM 26° Mostly Clear 20% 6 mph SSW 78%
11 PM 26° Mostly Clear 20% 6 mph SSW 79%
12 AM 25° Mostly Clear 21% 7 mph SSW 81%
1 AM 24° Mostly Clear 5% 7 mph SSW 83%
2 AM 24° Mostly Clear 8% 7 mph SSW 83%
3 AM 24° Partly Cloudy 9% 7 mph SSW 83%
4 AM 24° Partly Cloudy 9% 7 mph SSW 83%
5 AM 23° Mostly Clear 9% 7 mph SSW 84%
15-Day Forecast
Today
8/11
Mostly Clear
28%
23°
34°
Wed
8/12
Partly Cloudy
37%
23°
36°
Thu
8/13
Mostly Cloudy
37%
23°
37°
Fri
8/14
Clear
15%
23°
36°
Sat
8/15
Clear
7%
24°
37°
Sun
8/16
Rain
50%
24°
37°
Mon
8/17
Rain
62%
23°
36°
Tue
8/18
Mostly Clear
34%
23°
34°
Wed
8/19
Mostly Clear
35%
21°
34°
Thu
8/20
Mostly Clear
35%
20°
32°
Fri
8/21
Clear
36%
21°
34°
Sat
8/22
Drizzle
60%
22°
34°
Sun
8/23
Drizzle
60%
22°
33°
Mon
8/24
Drizzle
60%
22°
33°
Tue
8/25
Drizzle
60%
21°
32°
32
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
32 AQI 5.7 µg/m³
O3
Ground-level ozone
29 AQI 32 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Today 32 Good 29 32
Wed 31 Good 31 24
Thu 35 Good 35 28
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 Tue Aug 11, 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
SBCAPE984 J/kg
MLCAPE1137 J/kg
MUCAPE1445 J/kg
SBCIN-264 J/kg
MLCIN0 J/kg
Lifted Index-4.4
Kinematics
0–6 km Shear8 kt
0–1 km Shear13 kt
Eff. Shear8 kt
0–1 km SRH66
0–3 km SRH30
Eff. SRH-8
Storm Motion349° @ 13 kt
0–1 km EHI0.4
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index27.2
Thermo & Levels
PWAT1.50 in
0–3 km LR4.3 °C/km
700–500 LR7.0 °C/km
Total Totals48.6
LCL973 hPa
LFC651 hPa
EL216 hPa
Freezing Lvl14,797 ft