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

Chester County, South Carolina, United States

Last updated: 4:12 PM CDT  ·  Refresh
27°C
Feels like 29°
Drizzle
▲ 31°  /  ▼ 19°
Wind
7 mph W
Humidity
71%
Dew Point
22°
Pressure
29.39 inHg
Visibility
6 mi
UV Index
1.8
Cloud Cover
99%
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 drizzle at 27°C. Precipitation is likely — peak probability 76% around 7 PM. Atmospheric instability is elevated (CAPE up to 1375 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
27°
63%
6 PM
27°
70%
7 PM
26°
76%
8 PM
24°
54%
9 PM
24°
57%
10 PM
22°
56%
11 PM
22°
52%
12 AM
22°
57%
1 AM
22°
46%
2 AM
22°
41%
3 AM
21°
29%
4 AM
21°
16%
5 AM
21°
15%
6 AM
19°
22%
7 AM
19°
32%
8 AM
20°
28%
9 AM
21°
28%
10 AM
22°
18%
11 AM
22°
18%
12 PM
24°
18%
1 PM
26°
18%
2 PM
28°
18%
3 PM
29°
24%
4 PM
29°
35%
7-Day Forecast
Today
31° 19°
Drizzle, 63% chance.
Sat
32° 19°
Mostly Cloudy with a 55% chance of rain.
Sun
33° 19°
Clear.
Mon
32° 18°
Mostly Clear with a 45% chance of rain.
Tue
32° 18°
Clear with a 30% chance of rain.
Wed
34° 19°
Heavy Rain, 82% chance.
Thu
31° 22°
Rain, 90% chance.
TimeTempConditionsPrecipWindHumidity
Now 27° Drizzle 63% 7 mph W 71%
6 PM 27° Rain 70% 4 mph SE 79%
7 PM 26° Overcast 76% 5 mph E 84%
8 PM 24° Overcast 54% 4 mph NE 88%
9 PM 24° Overcast 57% 4 mph ENE 91%
10 PM 22° Overcast 56% 6 mph ESE 94%
11 PM 22° Rain 52% 6 mph ESE 96%
12 AM 22° Rain 57% 4 mph ESE 96%
1 AM 22° Rain 46% 5 mph ESE 97%
2 AM 22° Rain 41% 3 mph ESE 97%
3 AM 21° Mostly Cloudy 29% 2 mph ENE 97%
4 AM 21° Partly Cloudy 16% 3 mph SW 98%
5 AM 21° Partly Cloudy 15% 2 mph N 98%
6 AM 19° Mostly Cloudy 22% 2 mph ENE 98%
7 AM 19° Overcast 32% 2 mph E 97%
8 AM 20° Overcast 28% 2 mph E 96%
9 AM 21° Overcast 28% 2 mph E 93%
10 AM 22° Overcast 18% 2 mph NE 90%
11 AM 22° Overcast 18% 2 mph N 86%
12 PM 24° Mostly Cloudy 18% 2 mph NW 80%
1 PM 26° Mostly Cloudy 18% 2 mph WNW 73%
2 PM 28° Mostly Cloudy 18% 2 mph WNW 68%
3 PM 29° Mostly Cloudy 24% 2 mph WNW 64%
4 PM 29° Mostly Cloudy 35% 2 mph W 61%
15-Day Forecast
Today
8/21
Drizzle
63%
19°
31°
Sat
8/22
Mostly Cloudy
55%
19°
32°
Sun
8/23
Clear
7%
19°
33°
Mon
8/24
Mostly Clear
45%
18°
32°
Tue
8/25
Clear
30%
18°
32°
Wed
8/26
Heavy Rain
82%
19°
34°
Thu
8/27
Rain
90%
22°
31°
Fri
8/28
Drizzle
53%
19°
34°
Sat
8/29
Rain
68%
21°
32°
Sun
8/30
Rain
68%
19°
34°
Mon
8/31
Drizzle
60%
19°
34°
Tue
9/1
Drizzle
60%
22°
36°
Wed
9/2
Drizzle
60%
22°
34°
Thu
9/3
Drizzle
60%
21°
34°
Fri
9/4
Drizzle
60%
21°
34°
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, 20:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE1004 J/kg
MLCAPE1444 J/kg
MUCAPE1883 J/kg
SBCIN-57 J/kg
MLCIN-29 J/kg
Lifted Index-4.9
Kinematics
0–6 km Shear15 kt
0–1 km Shear2 kt
Eff. Shear14 kt
0–1 km SRH7
0–3 km SRH71
Eff. SRH71
Storm Motion278° @ 19 kt
0–1 km EHI0.1
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index44.4
Thermo & Levels
PWAT2.52 in
0–3 km LR5.9 °C/km
700–500 LR6.3 °C/km
Total Totals52.9
LCL925 hPa
LFC772 hPa
EL191 hPa
Freezing Lvl14,078 ft