Severe Thunderstorm Watch 8:00 PM Severe Thunderstorm Watch 8:00 PM

Chester County, South Carolina, United States

Last updated: 6:31 PM CDT  ·  Refresh
23°C
Feels like 27°
Overcast
▲ 31°  /  ▼ 19°
Wind
3 mph E
Humidity
87%
Dew Point
22°
Pressure
29.38 inHg
Visibility
10 mi
UV Index
1.0
Cloud Cover
87%
Sunrise
6:49 AM
Sunset
8:05 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Chester County is currently overcast at 23°C. Precipitation is likely — peak probability 68% around 9 PM. Atmospheric instability is elevated (CAPE up to 1268 J/kg) — isolated convective development possible. Sunrise: 6:49AM · Sunset: 8:05PM.

Alerts

Severe Thunderstorm Watch
Expires 8:00 PM
Severe Thunderstorm Watch
Expires 8:00 PM
42 AQI · Good Dominant: O3 Air Quality
Hourly Forecast · Next 24 Hours
Now
23°
64%
8 PM
24°
66%
9 PM
23°
67%
10 PM
23°
62%
11 PM
22°
47%
12 AM
21°
48%
1 AM
22°
47%
2 AM
21°
32%
3 AM
21°
34%
4 AM
21°
30%
5 AM
19°
30%
6 AM
19°
24%
7 AM
19°
24%
8 AM
20°
29%
9 AM
21°
9%
10 AM
22°
9%
11 AM
23°
12%
12 PM
24°
9%
1 PM
27°
9%
2 PM
27°
16%
3 PM
28°
17%
4 PM
28°
27%
5 PM
28°
32%
6 PM
28°
32%
7-Day Forecast
Tonight
31° 19°
Overcast with a 64% chance of rain.
Sat
30° 19°
Mostly Cloudy with a 47% chance of rain.
Sun
31° 20°
Mostly Clear.
Mon
30° 18°
Clear with a 53% chance of rain.
Tue
30° 18°
Mostly Clear with a 37% chance of rain.
Wed
31° 19°
Heavy Rain, 80% chance.
Thu
29° 19°
Rain, 80% chance.
TimeTempConditionsPrecipWindHumidity
Now 23° Overcast 64% 3 mph E 87%
8 PM 24° Overcast 66% 4 mph E 90%
9 PM 23° Overcast 67% 4 mph E 94%
10 PM 23° Overcast 62% 4 mph ESE 96%
11 PM 22° Overcast 47% 4 mph SE 98%
12 AM 21° Overcast 48% 2 mph SE 98%
1 AM 22° Overcast 47% 3 mph SSE 98%
2 AM 21° Overcast 32% 3 mph SSE 98%
3 AM 21° Overcast 34% 2 mph SSE 98%
4 AM 21° Mostly Cloudy 30% 2 mph NNE 98%
5 AM 19° Fog 30% 2 mph NNE 98%
6 AM 19° Fog 24% 2 mph ENE 98%
7 AM 19° Overcast 24% 2 mph ENE 97%
8 AM 20° Overcast 29% 2 mph N 95%
9 AM 21° Overcast 9% 1 mph WNW 91%
10 AM 22° Overcast 9% 2 mph WNW 87%
11 AM 23° Overcast 12% 2 mph WNW 81%
12 PM 24° Mostly Cloudy 9% 2 mph W 75%
1 PM 27° Mostly Cloudy 9% 2 mph W 68%
2 PM 27° Mostly Cloudy 16% 2 mph W 64%
3 PM 28° Partly Cloudy 17% 2 mph WSW 62%
4 PM 28° Partly Cloudy 27% 2 mph WSW 59%
5 PM 28° Partly Cloudy 32% 2 mph SW 60%
6 PM 28° Mostly Clear 32% 2 mph SW 63%
15-Day Forecast
Today
8/21
Overcast
64%
19°
31°
Sat
8/22
Mostly Cloudy
47%
19°
30°
Sun
8/23
Mostly Clear
15%
20°
31°
Mon
8/24
Clear
53%
18°
30°
Tue
8/25
Mostly Clear
37%
18°
30°
Wed
8/26
Heavy Rain
80%
19°
31°
Thu
8/27
Rain
80%
19°
29°
Fri
8/28
Drizzle
56%
22°
31°
Sat
8/29
Rain
73%
20°
32°
Sun
8/30
Rain
72%
19°
32°
Mon
8/31
Drizzle
56%
19°
37°
Tue
9/1
Drizzle
60%
22°
36°
Wed
9/2
Drizzle
60%
22°
32°
Thu
9/3
Drizzle
60%
21°
32°
Fri
9/4
Rain
90%
21°
32°
42
Good
U.S. Air Quality Index · Dominant: O3
50 100 150 200

Air quality is satisfactory and poses little or no health risk.

Pollutant Breakdown · Today
PM2.5
Fine particulate matter
27 AQI 4.8 µg/m³
O3
Ground-level ozone
Dominant
42 AQI 45 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Sat 42 Good 42 27
Sun 40 Good 40 19
Mon 31 Good 31 24
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 21, 22:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE448 J/kg
MLCAPE1105 J/kg
MUCAPE2805 J/kg
SBCIN-159 J/kg
MLCIN-74 J/kg
Lifted Index-2.8
Kinematics
0–6 km Shear20 kt
0–1 km Shear11 kt
Eff. Shear18 kt
0–1 km SRH62
0–3 km SRH145
Eff. SRH145
Storm Motion278° @ 22 kt
0–1 km EHI0.2
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index40.1
Thermo & Levels
PWAT2.15 in
0–3 km LR5.0 °C/km
700–500 LR5.6 °C/km
Total Totals49.4
LCL975 hPa
LFC752 hPa
EL338 hPa
Freezing Lvl14,003 ft