Severe Thunderstorm Watch 8:00 PM Severe Thunderstorm Watch 8:00 PM Areal Flood Advisory — Clarendon County, SC, Lee County, SC, Orangeburg County, SC, Sumter County, SC 9:00 PM

Sumter County, South Carolina, United States

Last updated: 6:32 PM CDT  ·  Refresh
27°C
Feels like 29°
Rain
▲ 34°  /  ▼ 21°
Wind
6 mph SE
Humidity
85%
Dew Point
23°
Pressure
29.80 inHg
Visibility
10 mi
UV Index
0.8
Cloud Cover
86%
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 rain at 27°C. Precipitation is likely — peak probability 83% around 8 PM. Atmospheric instability is elevated (CAPE up to 1718 J/kg) — isolated convective development possible. Sunrise: 6:47AM · Sunset: 8:00PM.

Alerts

Severe Thunderstorm Watch
Expires 8:00 PM
Severe Thunderstorm Watch
Expires 8:00 PM
Areal Flood Advisory
Clarendon County, SC, Lee County, SC, Orangeburg County, SC, Sumter County, SC
Expires 9:00 PM
52 AQI · Moderate Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
27°
80%
8 PM
26°
82%
9 PM
24°
81%
10 PM
24°
80%
11 PM
23°
50%
12 AM
23°
42%
1 AM
23°
38%
2 AM
23°
27%
3 AM
23°
24%
4 AM
23°
29%
5 AM
21°
35%
6 AM
21°
38%
7 AM
21°
38%
8 AM
22°
42%
9 AM
23°
44%
10 AM
24°
48%
11 AM
26°
40%
12 PM
26°
43%
1 PM
29°
43%
2 PM
31°
48%
3 PM
31°
52%
4 PM
31°
49%
5 PM
30°
50%
6 PM
29°
46%
7-Day Forecast
Tonight
34° 21°
Rain, 80% chance.
Sat
33° 21°
Partly Cloudy with a 48% chance of rain.
Sun
34° 22°
Partly Cloudy.
Mon
33° 20°
Mostly Clear with a 53% chance of rain.
Tue
32° 20°
Drizzle, 45% chance.
Wed
33° 22°
Heavy Rain, 83% chance.
Thu
33° 21°
Heavy Rain, 83% chance.
TimeTempConditionsPrecipWindHumidity
Now 27° Rain 80% 6 mph SE 85%
8 PM 26° Heavy Rain 82% 6 mph SSE 91%
9 PM 24° Heavy Rain 81% 6 mph SE 92%
10 PM 24° Thunderstorm 80% 4 mph SE 91%
11 PM 23° Rain 50% 3 mph ESE 92%
12 AM 23° Overcast 42% 3 mph ESE 94%
1 AM 23° Mostly Cloudy 38% 2 mph ESE 95%
2 AM 23° Mostly Cloudy 27% 2 mph NNE 96%
3 AM 23° Overcast 24% 2 mph NNE 96%
4 AM 23° Overcast 29% 2 mph ESE 96%
5 AM 21° Mostly Cloudy 35% 3 mph ESE 96%
6 AM 21° Partly Cloudy 38% 3 mph ESE 95%
7 AM 21° Partly Cloudy 38% 3 mph SSE 94%
8 AM 22° Partly Cloudy 42% 4 mph SW 90%
9 AM 23° Partly Cloudy 44% 4 mph WSW 83%
10 AM 24° Partly Cloudy 48% 5 mph WSW 77%
11 AM 26° Partly Cloudy 40% 5 mph WSW 72%
12 PM 26° Partly Cloudy 43% 5 mph WSW 69%
1 PM 29° Partly Cloudy 43% 6 mph WSW 67%
2 PM 31° Partly Cloudy 48% 6 mph WSW 65%
3 PM 31° Partly Cloudy 52% 6 mph SW 64%
4 PM 31° Partly Cloudy 49% 6 mph SW 63%
5 PM 30° Mostly Clear 50% 6 mph SW 64%
6 PM 29° Mostly Clear 46% 5 mph SW 67%
15-Day Forecast
Today
8/21
Rain
80%
21°
34°
Sat
8/22
Partly Cloudy
48%
21°
33°
Sun
8/23
Partly Cloudy
15%
22°
34°
Mon
8/24
Mostly Clear
53%
20°
33°
Tue
8/25
Drizzle
45%
20°
32°
Wed
8/26
Heavy Rain
83%
22°
33°
Thu
8/27
Heavy Rain
83%
21°
33°
Fri
8/28
Rain
73%
24°
34°
Sat
8/29
Rain
73%
22°
35°
Sun
8/30
Rain
72%
20°
34°
Mon
8/31
Drizzle
56%
21°
37°
Tue
9/1
Rain
90%
23°
36°
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 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
SBCAPE1200 J/kg
MLCAPE1443 J/kg
MUCAPE3061 J/kg
SBCIN-145 J/kg
MLCIN-63 J/kg
Lifted Index-4.6
Kinematics
0–6 km Shear15 kt
0–1 km Shear5 kt
Eff. Shear16 kt
0–1 km SRH-2
0–3 km SRH55
Eff. SRH55
Storm Motion279° @ 17 kt
0–1 km EHI-0.0
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index39.4
Thermo & Levels
PWAT2.37 in
0–3 km LR6.0 °C/km
700–500 LR5.5 °C/km
Total Totals49.3
LCL953 hPa
LFC809 hPa
EL193 hPa
Freezing Lvl14,311 ft