Severe Thunderstorm Warning — Calhoun County, SC, Clarendon County, SC, Richland County, SC, Sumter County, SC 6:00 PM Severe Thunderstorm Watch 8:00 PM Severe Thunderstorm Watch 8:00 PM

Sumter County, South Carolina, United States

Last updated: 5:21 PM CDT  ·  Refresh
31°C
Feels like 37°
Mostly Cloudy
▲ 34°  /  ▼ 21°
Wind
6 mph SW
Humidity
66%
Dew Point
23°
Pressure
29.77 inHg
Visibility
10 mi
UV Index
3.1
Cloud Cover
75%
Sunrise
6:47 AM
Sunset
8:00 PM
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WeatherAI™ Analysis

WeatherAI Analysis: Sumter County is currently mostly cloudy at 31°C. Precipitation is likely — peak probability 88% around 7 PM. Atmospheric instability is elevated (CAPE up to 1672 J/kg) — isolated convective development possible. Sunrise: 6:47AM · Sunset: 8:00PM.

Alerts

Severe Thunderstorm Warning
Calhoun County, SC, Clarendon County, SC, Richland County, SC, Sumter County, SC
Expires 6:00 PM
Severe Thunderstorm Watch
Expires 8:00 PM
Severe Thunderstorm Watch
Expires 8:00 PM
52 AQI · Moderate Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
31°
73%
7 PM
27°
88%
8 PM
26°
81%
9 PM
25°
80%
10 PM
24°
79%
11 PM
23°
68%
12 AM
23°
64%
1 AM
23°
51%
2 AM
23°
35%
3 AM
23°
36%
4 AM
23°
32%
5 AM
22°
27%
6 AM
21°
30%
7 AM
21°
30%
8 AM
22°
34%
9 AM
23°
35%
10 AM
24°
40%
11 AM
26°
40%
12 PM
26°
43%
1 PM
28°
43%
2 PM
30°
44%
3 PM
30°
47%
4 PM
31°
47%
5 PM
31°
45%
7-Day Forecast
Tonight
34° 21°
Mostly Cloudy with a 80% chance of rain.
Sat
33° 21°
Partly Cloudy with a 64% chance of rain.
Sun
34° 22°
Partly Cloudy with a 20% chance of rain.
Mon
33° 21°
Mostly Clear with a 53% chance of rain.
Tue
32° 21°
Drizzle, 45% chance.
Wed
33° 21°
Rain, 69% chance.
Thu
32° 22°
Heavy Rain, 83% chance.
TimeTempConditionsPrecipWindHumidity
Now 31° Mostly Cloudy 73% 6 mph SW 66%
7 PM 27° Rain 88% 7 mph SSE 83%
8 PM 26° Overcast 81% 6 mph S 92%
9 PM 25° Heavy Rain 80% 6 mph SSE 92%
10 PM 24° Thunderstorm 79% 4 mph SSE 92%
11 PM 23° Heavy Rain 68% 3 mph SSE 92%
12 AM 23° Overcast 64% 3 mph SSE 94%
1 AM 23° Mostly Cloudy 51% 3 mph SE 95%
2 AM 23° Mostly Cloudy 35% 3 mph ESE 96%
3 AM 23° Mostly Cloudy 36% 2 mph SSE 96%
4 AM 23° Overcast 32% 2 mph SSE 96%
5 AM 22° Overcast 27% 3 mph S 95%
6 AM 21° Mostly Cloudy 30% 2 mph S 94%
7 AM 21° Partly Cloudy 30% 2 mph S 93%
8 AM 22° Partly Cloudy 34% 2 mph SW 90%
9 AM 23° Partly Cloudy 35% 3 mph WSW 84%
10 AM 24° Partly Cloudy 40% 4 mph WSW 78%
11 AM 26° Partly Cloudy 40% 5 mph WSW 72%
12 PM 26° Partly Cloudy 43% 5 mph WSW 69%
1 PM 28° Partly Cloudy 43% 5 mph WSW 66%
2 PM 30° Partly Cloudy 44% 5 mph WSW 64%
3 PM 30° Partly Cloudy 47% 5 mph SW 63%
4 PM 31° Partly Cloudy 47% 6 mph SW 61%
5 PM 31° Partly Cloudy 45% 5 mph SW 61%
15-Day Forecast
Today
8/21
Mostly Cloudy
80%
21°
34°
Sat
8/22
Partly Cloudy
64%
21°
33°
Sun
8/23
Partly Cloudy
20%
22°
34°
Mon
8/24
Mostly Clear
53%
21°
33°
Tue
8/25
Drizzle
45%
21°
32°
Wed
8/26
Rain
69%
21°
33°
Thu
8/27
Heavy Rain
83%
22°
32°
Fri
8/28
Rain
73%
21°
33°
Sat
8/29
Drizzle
54%
22°
32°
Sun
8/30
Drizzle
54%
21°
34°
Mon
8/31
Drizzle
60%
19°
34°
Tue
9/1
Rain
90%
23°
35°
Wed
9/2
Drizzle
60%
23°
34°
Thu
9/3
Drizzle
60%
22°
34°
Fri
9/4
Drizzle
60%
22°
33°
52
Moderate
U.S. Air Quality Index · Dominant: PM2.5
50 100 150 200

Air quality is acceptable. Unusually sensitive people should consider limiting prolonged outdoor exertion.

Pollutant Breakdown · Today
PM2.5
Fine particulate matter
Dominant
52 AQI 9.6 µg/m³
O3
Ground-level ozone
41 AQI 44 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Sat 52 Moderate 41 52
Sun 40 Good 40 38
Mon 42 Good 38 42
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, 21:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE2837 J/kg
MLCAPE1792 J/kg
MUCAPE2837 J/kg
SBCIN-6 J/kg
MLCIN-48 J/kg
Lifted Index-6.6
Kinematics
0–6 km Shear10 kt
0–1 km Shear12 kt
Eff. Shear13 kt
0–1 km SRH48
0–3 km SRH77
Eff. SRH77
Storm Motion317° @ 9 kt
0–1 km EHI0.9
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index40.3
Thermo & Levels
PWAT2.05 in
0–3 km LR7.7 °C/km
700–500 LR5.2 °C/km
Total Totals48.6
LCL896 hPa
LFC849 hPa
EL148 hPa
Freezing Lvl14,957 ft