Severe Thunderstorm Watch 8:00 PM Severe Thunderstorm Watch 8:00 PM Areal Flood Watch 7:00 AM Excessive Heat Watch 8:00 PM

Williamson County, Middle Tennessee, Tennessee, United States

Last updated: 5:13 PM CDT  ·  Refresh
28°C
Feels like 34°
Partly Cloudy
▲ 31°  /  ▼ 22°
Wind
11 mph SSW
Humidity
86%
Dew Point
23°
Pressure
29.15 inHg
Visibility
10 mi
UV Index
5.4
Cloud Cover
59%
Sunrise
5:33 AM
Sunset
8:08 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Williamson County is currently partly cloudy at 28°C. Precipitation is likely — peak probability 68% around 6 PM. Atmospheric instability is elevated (CAPE up to 3128 J/kg) — isolated convective development possible. Sunrise: 5:33AM · Sunset: 8:08PM.

Alerts

Severe Thunderstorm Watch
Expires 8:00 PM
Severe Thunderstorm Watch
Expires 8:00 PM
Areal Flood Watch
Expires 7:00 AM
Excessive Heat Watch
Expires 8:00 PM
33 AQI · Good Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
28°
66%
6 PM
29°
68%
7 PM
28°
49%
8 PM
27°
50%
9 PM
26°
51%
10 PM
25°
49%
11 PM
25°
44%
12 AM
24°
49%
1 AM
23°
51%
2 AM
23°
36%
3 AM
23°
33%
4 AM
23°
33%
5 AM
22°
43%
6 AM
22°
39%
7 AM
23°
40%
8 AM
24°
40%
9 AM
27°
41%
10 AM
28°
37%
11 AM
29°
38%
12 PM
30°
38%
1 PM
33°
41%
2 PM
33°
41%
3 PM
32°
50%
4 PM
33°
57%
7-Day Forecast
Today
31° 22°
Partly Cloudy with a 66% chance of rain.
Sun
35° 22°
Partly Cloudy with a 56% chance of rain.
Mon
36° 23°
Clear.
Tue
36° 24°
Clear.
Wed
36° 24°
Partly Cloudy.
Thu
36° 24°
Thunderstorm, 81% chance.
Fri
36° 24°
Partly Cloudy with a 60% chance of rain.
TimeTempConditionsPrecipWindHumidity
Now 28° Partly Cloudy 66% 11 mph SSW 86%
6 PM 29° Overcast 68% 10 mph SSW 90%
7 PM 28° Overcast 49% 8 mph SSW 91%
8 PM 27° Overcast 50% 6 mph SSW 91%
9 PM 26° Mostly Cloudy 51% 6 mph SSW 90%
10 PM 25° Mostly Cloudy 49% 6 mph SSW 90%
11 PM 25° Overcast 44% 6 mph SSW 90%
12 AM 24° Overcast 49% 7 mph SSW 92%
1 AM 23° Overcast 51% 6 mph SSW 93%
2 AM 23° Mostly Cloudy 36% 5 mph SSW 93%
3 AM 23° Mostly Cloudy 33% 6 mph SSW 92%
4 AM 23° Mostly Cloudy 33% 6 mph SSW 92%
5 AM 22° Partly Cloudy 43% 7 mph SW 92%
6 AM 22° Partly Cloudy 39% 7 mph SW 91%
7 AM 23° Mostly Clear 40% 8 mph SW 90%
8 AM 24° Partly Cloudy 40% 8 mph WSW 86%
9 AM 27° Partly Cloudy 41% 9 mph WSW 83%
10 AM 28° Partly Cloudy 37% 10 mph WSW 80%
11 AM 29° Partly Cloudy 38% 10 mph WSW 76%
12 PM 30° Partly Cloudy 38% 10 mph WSW 73%
1 PM 33° Partly Cloudy 41% 10 mph WSW 71%
2 PM 33° Partly Cloudy 41% 9 mph WSW 72%
3 PM 32° Partly Cloudy 50% 9 mph WSW 72%
4 PM 33° Partly Cloudy 57% 8 mph W 73%
15-Day Forecast
Today
6/27
Partly Cloudy
66%
22°
31°
Sun
6/28
Partly Cloudy
56%
22°
35°
Mon
6/29
Clear
7%
23°
36°
Tue
6/30
Clear
16%
24°
36°
Wed
7/1
Partly Cloudy
19%
24°
36°
Thu
7/2
Thunderstorm
81%
24°
36°
Fri
7/3
Partly Cloudy
60%
24°
36°
Sat
7/4
Thunderstorm
81%
23°
34°
Sun
7/5
Drizzle
60%
23°
33°
Mon
7/6
Thunderstorm
60%
22°
33°
Tue
7/7
Drizzle
75%
22°
33°
Wed
7/8
Drizzle
60%
22°
32°
Thu
7/9
Drizzle
60%
21°
31°
Fri
7/10
Drizzle
60%
21°
31°
Sat
7/11
Drizzle
60%
21°
31°
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
25 AQI 27 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Sun 33 Good 25 33
Mon 34 Good 29 34
Tue 48 Good 36 48
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 Sat Jun 27, 20:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 50 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE2538 J/kg
MLCAPE2473 J/kg
MUCAPE2712 J/kg
SBCIN-52 J/kg
MLCIN0 J/kg
Lifted Index-6.9
Kinematics
0–6 km Shear35 kt
0–1 km Shear12 kt
Eff. Shear28 kt
0–1 km SRH-9
0–3 km SRH-45
Eff. SRH-45
Storm Motion232° @ 33 kt
0–1 km EHI-0.1
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index33.9
Thermo & Levels
PWAT2.10 in
0–3 km LR6.2 °C/km
700–500 LR6.3 °C/km
Total Totals50.7
LCL915 hPa
LFC866 hPa
EL151 hPa
Freezing Lvl14,688 ft