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

Williamsburg County, South Carolina, United States

Last updated: 1:47 PM CDT  ·  Refresh
33°C
Feels like 39°
Mostly Clear
▲ 36°  /  ▼ 22°
Wind
4 mph SSW
Humidity
58%
Dew Point
23°
Pressure
29.90 inHg
Visibility
10 mi
UV Index
9.0
Cloud Cover
21%
Sunrise
6:45 AM
Sunset
7:58 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Williamsburg County is currently mostly clear at 33°C. Precipitation is likely — peak probability 71% around 9 PM. Atmospheric instability is elevated (CAPE up to 2352 J/kg) — isolated convective development possible. Sunrise: 6:45AM · Sunset: 7:58PM.

Alerts

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
33°
30%
3 PM
34°
44%
4 PM
34°
48%
5 PM
34°
60%
6 PM
32°
70%
7 PM
29°
66%
8 PM
27°
70%
9 PM
26°
71%
10 PM
25°
66%
11 PM
24°
55%
12 AM
24°
47%
1 AM
23°
34%
2 AM
23°
35%
3 AM
23°
31%
4 AM
23°
33%
5 AM
22°
42%
6 AM
22°
42%
7 AM
22°
47%
8 AM
23°
47%
9 AM
26°
47%
10 AM
27°
47%
11 AM
28°
47%
12 PM
28°
48%
1 PM
29°
48%
7-Day Forecast
Today
36° 22°
Mostly Clear with a 70% chance of rain.
Sat
33° 22°
Rain, 53% chance.
Sun
33° 21°
Partly Cloudy.
Mon
34° 21°
Mostly Clear with a 60% chance of rain.
Tue
31° 21°
Rain, 69% chance.
Wed
32° 20°
Rain, 82% chance.
Thu
32° 22°
Rain, 82% chance.
TimeTempConditionsPrecipWindHumidity
Now 33° Mostly Clear 30% 4 mph SSW 58%
3 PM 34° Mostly Clear 44% 6 mph SSW 52%
4 PM 34° Mostly Clear 48% 8 mph SSW 46%
5 PM 34° Partly Cloudy 60% 6 mph SSW 52%
6 PM 32° Partly Cloudy 70% 6 mph SSE 64%
7 PM 29° Partly Cloudy 66% 8 mph E 78%
8 PM 27° Mostly Cloudy 70% 7 mph E 84%
9 PM 26° Mostly Cloudy 71% 6 mph ESE 86%
10 PM 25° Mostly Cloudy 66% 5 mph ENE 88%
11 PM 24° Overcast 55% 5 mph NNE 90%
12 AM 24° Overcast 47% 3 mph NE 92%
1 AM 23° Overcast 34% 4 mph NNE 93%
2 AM 23° Rain 35% 3 mph NE 94%
3 AM 23° Drizzle 31% 2 mph E 95%
4 AM 23° Drizzle 33% 3 mph ESE 95%
5 AM 22° Mostly Cloudy 42% 3 mph ESE 95%
6 AM 22° Mostly Cloudy 42% 2 mph ESE 94%
7 AM 22° Partly Cloudy 47% 2 mph S 92%
8 AM 23° Partly Cloudy 47% 3 mph SW 87%
9 AM 26° Partly Cloudy 47% 4 mph WSW 81%
10 AM 27° Rain 47% 5 mph WSW 76%
11 AM 28° Rain 47% 5 mph WSW 72%
12 PM 28° Rain 48% 5 mph WSW 68%
1 PM 29° Rain 48% 5 mph WSW 65%
15-Day Forecast
Today
8/21
Mostly Clear
70%
22°
36°
Sat
8/22
Rain
53%
22°
33°
Sun
8/23
Partly Cloudy
7%
21°
33°
Mon
8/24
Mostly Clear
60%
21°
34°
Tue
8/25
Rain
69%
21°
31°
Wed
8/26
Rain
82%
20°
32°
Thu
8/27
Rain
82%
22°
32°
Fri
8/28
Rain
82%
21°
32°
Sat
8/29
Drizzle
44%
22°
31°
Sun
8/30
Drizzle
51%
22°
33°
Mon
8/31
Drizzle
60%
24°
33°
Tue
9/1
Drizzle
60%
23°
34°
Wed
9/2
Clear
60%
23°
33°
Thu
9/3
Drizzle
60%
23°
33°
Fri
9/4
Drizzle
60%
22°
32°
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
44 AQI 47 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Sat 52 Moderate 44 52
Sun 36 Good 35 36
Mon 44 Good 40 44
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, 17:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE3078 J/kg
MLCAPE1771 J/kg
MUCAPE3078 J/kg
SBCIN-11 J/kg
MLCIN-68 J/kg
Lifted Index-8.3
Kinematics
0–6 km Shear13 kt
0–1 km Shear5 kt
Eff. Shear10 kt
0–1 km SRH14
0–3 km SRH47
Eff. SRH47
Storm Motion272° @ 17 kt
0–1 km EHI0.3
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index38.2
Thermo & Levels
PWAT2.20 in
0–3 km LR7.8 °C/km
700–500 LR6.1 °C/km
Total Totals50.5
LCL875 hPa
LFC840 hPa
EL146 hPa
Freezing Lvl14,613 ft