Heat Advisory — Stewart, TN, Montgomery, TN, Houston, TN, Humphreys, TN, Dickson, TN, Perry, TN, Hickman, TN, Lewis, TN, Wayne, TN, Lawrence, TN, Robertson, TN, Sumner, TN, Macon, TN, Cheatham, TN, Davidson, TN, Wilson, TN, Trousdale, TN, Smith, TN, Williamson, TN, Maury, TN, Marshall, TN, Rutherford, TN, Bedford, TN, Giles, TN 8:00 PM

Williamson County, Middle Tennessee, Tennessee, United States

Last updated: 4:36 AM CDT  ·  Refresh
23°C
Feels like 26°
Rain
▲ 34°  /  ▼ 22°
Wind
6 mph W
Humidity
93%
Dew Point
22°
Pressure
29.13 inHg
Visibility
7 mi
UV Index
0.0
Cloud Cover
96%
Sunrise
5:51 AM
Sunset
7:56 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Williamson County is currently rain at 23°C. Precipitation is likely — peak probability 82% around 4 AM. Atmospheric instability is elevated (CAPE up to 3670 J/kg) — isolated convective development possible. Sunrise: 5:51AM · Sunset: 7:56PM.

Alerts

Heat Advisory
Stewart, TN, Montgomery, TN, Houston, TN, Humphreys, TN, Dickson, TN, Perry, TN, Hickman, TN, Lewis, TN, Wayne, TN, Lawrence, TN, Robertson, TN, Sumner, TN, Macon, TN, Cheatham, TN, Davidson, TN, Wilson, TN, Trousdale, TN, Smith, TN, Williamson, TN, Maury, TN, Marshall, TN, Rutherford, TN, Bedford, TN, Giles, TN
Expires 8:00 PM
39 AQI · Good Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
23°
82%
5 AM
22°
78%
6 AM
22°
57%
7 AM
22°
55%
8 AM
24°
29%
9 AM
26°
25%
10 AM
27°
26%
11 AM
28°
28%
12 PM
30°
20%
1 PM
33°
20%
2 PM
33°
21%
3 PM
34°
19%
4 PM
34°
19%
5 PM
34°
11%
6 PM
33°
10%
7 PM
32°
5%
8 PM
31°
5%
9 PM
29°
5%
10 PM
28°
8%
11 PM
27°
8%
12 AM
27°
8%
1 AM
27°
9%
2 AM
27°
5%
3 AM
26°
5%
7-Day Forecast
Today
34° 22°
Heavy Rain, 82% chance.
Tue
37° 24°
Mostly Clear with a 50% chance of rain.
Wed
32° 20°
Partly Cloudy with a 24% chance of rain.
Thu
30° 19°
Clear with a 42% chance of rain.
Fri
29° 19°
Rain, 75% chance.
Sat
28° 19°
Rain, 90% chance.
Sun
28° 21°
Drizzle, 57% chance.
TimeTempConditionsPrecipWindHumidity
Now 23° Rain 82% 6 mph W 93%
5 AM 22° Rain 78% 6 mph SW 94%
6 AM 22° Overcast 57% 5 mph SW 95%
7 AM 22° Heavy Rain 55% 5 mph SW 93%
8 AM 24° Rain 29% 3 mph SSW 89%
9 AM 26° Mostly Cloudy 25% 3 mph SW 83%
10 AM 27° Partly Cloudy 26% 4 mph WSW 78%
11 AM 28° Mostly Clear 28% 4 mph WSW 72%
12 PM 30° Clear 20% 4 mph W 65%
1 PM 33° Clear 20% 4 mph WNW 61%
2 PM 33° Clear 21% 4 mph WNW 60%
3 PM 34° Clear 19% 4 mph NW 60%
4 PM 34° Clear 19% 3 mph NW 62%
5 PM 34° Mostly Clear 11% 3 mph NW 67%
6 PM 33° Partly Cloudy 10% 3 mph W 72%
7 PM 32° Partly Cloudy 5% 3 mph SSW 77%
8 PM 31° Partly Cloudy 5% 3 mph SSW 80%
9 PM 29° Partly Cloudy 5% 4 mph SSW 83%
10 PM 28° Mostly Cloudy 8% 4 mph SSW 85%
11 PM 27° Mostly Cloudy 8% 4 mph SSW 86%
12 AM 27° Mostly Cloudy 8% 5 mph SSW 87%
1 AM 27° Partly Cloudy 9% 5 mph SSW 88%
2 AM 27° Partly Cloudy 5% 5 mph SW 89%
3 AM 26° Partly Cloudy 5% 6 mph SW 90%
15-Day Forecast
Today
7/27
Heavy Rain
82%
22°
34°
Tue
7/28
Mostly Clear
50%
24°
37°
Wed
7/29
Partly Cloudy
24%
20°
32°
Thu
7/30
Clear
42%
19°
30°
Fri
7/31
Rain
75%
19°
29°
Sat
8/1
Rain
90%
19°
28°
Sun
8/2
Drizzle
57%
21°
28°
Mon
8/3
Rain
66%
21°
31°
Tue
8/4
Rain
66%
21°
32°
Wed
8/5
Drizzle
55%
22°
32°
Thu
8/6
Drizzle
67%
22°
34°
Fri
8/7
Drizzle
60%
22°
34°
Sat
8/8
Drizzle
60%
22°
33°
Sun
8/9
Drizzle
60%
22°
33°
Mon
8/10
Drizzle
60%
21°
33°
39
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
39 AQI 7.2 µg/m³
O3
Ground-level ozone
35 AQI 38 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Today 39 Good 35 39
Tue 51 Moderate 35 51
Wed 44 Good 37 44
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 Mon Jul 27, 08:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE297 J/kg
MLCAPE656 J/kg
MUCAPE1035 J/kg
SBCIN-122 J/kg
MLCIN0 J/kg
Lifted Index-1.5
Kinematics
0–6 km Shear24 kt
0–1 km Shear7 kt
Eff. Shear25 kt
0–1 km SRH-23
0–3 km SRH-31
Eff. SRH-31
Storm Motion297° @ 22 kt
0–1 km EHI-0.0
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index38.2
Thermo & Levels
PWAT2.31 in
0–3 km LR4.8 °C/km
700–500 LR5.3 °C/km
Total Totals45.9
LCL970 hPa
LFC743 hPa
EL314 hPa
Freezing Lvl14,964 ft