Severe Thunderstorm Warning — Calhoun County, SC, Richland County, SC, Sumter County, SC 4:45 PM Severe Thunderstorm Watch 8:00 PM Severe Thunderstorm Watch 8:00 PM

Sumter County, South Carolina, United States

Last updated: 4:13 PM CDT  ·  Refresh
34°C
Feels like 39°
Mostly Cloudy
▲ 34°  /  ▼ 21°
Wind
7 mph SSW
Humidity
46%
Dew Point
22°
Pressure
29,75 inHg
Visibility
10 mi
UV Index
5,3
Cloud Cover
63%
Sunrise
6:47 AM
Sunset
8:00 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Sumter County is currently mostly cloudy at 35°C. Precipitation is likely — peak probability 88% around 8 PM. Atmospheric instability is elevated (CAPE up to 1829 J/kg) — isolated convective development possible. Sunrise: 6:47AM · Sunset: 8:00PM.

Alerts

Severe Thunderstorm Warning
Calhoun County, SC, Richland County, SC, Sumter County, SC
Expires 4:45 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
34°
52%
6 PM
33°
65%
7 PM
29°
82%
8 PM
27°
87%
9 PM
26°
84%
10 PM
24°
84%
11 PM
23°
75%
12 AM
23°
71%
1 AM
23°
46%
2 AM
23°
36%
3 AM
22°
40%
4 AM
22°
36%
5 AM
22°
27%
6 AM
21°
33%
7 AM
21°
33%
8 AM
22°
42%
9 AM
23°
42%
10 AM
24°
55%
11 AM
25°
55%
12 PM
27°
58%
1 PM
27°
58%
2 PM
29°
59%
3 PM
29°
59%
4 PM
30°
55%
7-Day Forecast
Today
34° 21°
Mostly Cloudy with a 87% chance of rain.
Sat
33° 21°
Rain, 55% chance.
Sun
34° 21°
Mostly Clear.
Mon
34° 19°
Clear with a 60% chance of rain.
Tue
32° 21°
Drizzle, 51% chance.
Wed
33° 21°
Rain, 70% chance.
Thu
32° 23°
Rain, 82% chance.
TimeTempConditionsPrecipWindHumidity
Now 34° Mostly Cloudy 52% 7 mph SSW 46%
6 PM 33° Overcast 65% 5 mph SW 58%
7 PM 29° Overcast 82% 7 mph W 73%
8 PM 27° Heavy Rain 87% 6 mph S 84%
9 PM 26° Heavy Rain 84% 7 mph ESE 88%
10 PM 24° Heavy Rain 84% 8 mph ENE 90%
11 PM 23° Rain 75% 5 mph NE 93%
12 AM 23° Overcast 71% 4 mph NE 94%
1 AM 23° Mostly Cloudy 46% 2 mph NE 95%
2 AM 23° Mostly Cloudy 36% 3 mph E 96%
3 AM 22° Mostly Cloudy 40% 2 mph ENE 96%
4 AM 22° Overcast 36% 2 mph ESE 95%
5 AM 22° Overcast 27% 2 mph ESE 95%
6 AM 21° Mostly Cloudy 33% 2 mph ENE 94%
7 AM 21° Mostly Cloudy 33% 2 mph ENE 94%
8 AM 22° Fog 42% 2 mph NE 92%
9 AM 23° Partly Cloudy 42% 2 mph SE 86%
10 AM 24° Partly Cloudy 55% 2 mph SW 80%
11 AM 25° Rain 55% 3 mph SW 74%
12 PM 27° Rain 58% 3 mph SSW 71%
1 PM 27° Rain 58% 4 mph SSW 68%
2 PM 29° Heavy Rain 59% 5 mph SSW 65%
3 PM 29° Mostly Cloudy 59% 5 mph SSW 64%
4 PM 30° Partly Cloudy 55% 5 mph SSW 63%
15-Day Forecast
Today
8/21
Mostly Cloudy
87%
21°
34°
Sat
8/22
Rain
55%
21°
33°
Sun
8/23
Mostly Clear
10%
21°
34°
Mon
8/24
Clear
60%
19°
34°
Tue
8/25
Drizzle
51%
21°
32°
Wed
8/26
Rain
70%
21°
33°
Thu
8/27
Rain
82%
23°
32°
Fri
8/28
Rain
72%
21°
33°
Sat
8/29
Drizzle
44%
23°
32°
Sun
8/30
Drizzle
51%
21°
34°
Mon
8/31
Drizzle
60%
24°
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°
34°
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 ven. août 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
SBCAPE2376 J/kg
MLCAPE2113 J/kg
MUCAPE2376 J/kg
SBCIN-0 J/kg
MLCIN-15 J/kg
Lifted Index-6.8
Kinematics
0–6 km Shear10 kt
0–1 km Shear4 kt
Eff. Shear5 kt
0–1 km SRH9
0–3 km SRH65
Eff. SRH65
Storm Motion303° @ 11 kt
0–1 km EHI0.1
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index38.8
Thermo & Levels
PWAT2.15 in
0–3 km LR8.2 °C/km
700–500 LR5.9 °C/km
Total Totals51.1
LCL836 hPa
LFC821 hPa
EL149 hPa
Freezing Lvl15,105 ft