Severe Thunderstorm Watch 8:00 p. m. Severe Thunderstorm Watch 8:00 p. m.

Union County, South Carolina, United States

Last updated: 6:31 p. m. CDT  ·  Refresh
24°C
Feels like 28°
Mostly Cloudy
▲ 30°  /  ▼ 19°
Wind
6 mph SE
Humidity
87%
Dew Point
23°
Pressure
29,37 inHg
Visibility
10 mi
UV Index
1,6
Cloud Cover
61%
Sunrise
6:51 a. m.
Sunset
8:07 p. m.
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Union County is currently mostly cloudy at 25°C. Precipitation is likely — peak probability 82% around 10 p. m.. Atmospheric instability is elevated (CAPE up to 1129 J/kg) — isolated convective development possible. Sunrise: 6:51A. M. · Sunset: 8:07P. M..

Alerts

Severe Thunderstorm Watch
Expires 8:00 p. m.
Severe Thunderstorm Watch
Expires 8:00 p. m.
47 AQI · Good Dominant: O3 Air Quality
Hourly Forecast · Next 24 Hours
Now
24°
65%
8 p. m.
24°
66%
9 p. m.
23°
71%
10 p. m.
22°
82%
11 p. m.
22°
66%
12 a. m.
21°
51%
1 a. m.
22°
63%
2 a. m.
21°
30%
3 a. m.
21°
30%
4 a. m.
21°
19%
5 a. m.
19°
22%
6 a. m.
19°
27%
7 a. m.
19°
16%
8 a. m.
20°
24%
9 a. m.
21°
19%
10 a. m.
22°
24%
11 a. m.
23°
10%
12 p. m.
25°
12%
1 p. m.
28°
13%
2 p. m.
29°
14%
3 p. m.
29°
17%
4 p. m.
29°
27%
5 p. m.
29°
28%
6 p. m.
29°
39%
7-Day Forecast
Tonight
30° 19°
Mostly Cloudy with a 82% chance of rain.
Sat
31° 19°
Partly Cloudy with a 63% chance of rain.
Sun
32° 19°
Mostly Clear.
Mon
31° 18°
Mostly Clear with a 39% chance of rain.
Tue
31° 18°
Mostly Clear with a 26% chance of rain.
Wed
32° 19°
Heavy Rain, 80% chance.
Thu
30° 19°
Rain, 73% chance.
TimeTempConditionsPrecipWindHumidity
Now 24° Mostly Cloudy 65% 6 mph SE 87%
8 p. m. 24° Overcast 66% 7 mph SE 95%
9 p. m. 23° Overcast 71% 5 mph SE 97%
10 p. m. 22° Overcast 82% 4 mph ESE 98%
11 p. m. 22° Overcast 66% 3 mph ESE 97%
12 a. m. 21° Overcast 51% 3 mph SE 97%
1 a. m. 22° Rain 63% 2 mph ESE 97%
2 a. m. 21° Overcast 30% 3 mph NE 97%
3 a. m. 21° Overcast 30% 2 mph ENE 98%
4 a. m. 21° Mostly Cloudy 19% 2 mph ENE 98%
5 a. m. 19° Mostly Cloudy 22% 2 mph NE 98%
6 a. m. 19° Mostly Cloudy 27% 2 mph NNE 97%
7 a. m. 19° Mostly Cloudy 16% 2 mph NE 97%
8 a. m. 20° Mostly Cloudy 24% 2 mph NE 94%
9 a. m. 21° Mostly Cloudy 19% 2 mph N 89%
10 a. m. 22° Mostly Cloudy 24% 1 mph N 84%
11 a. m. 23° Mostly Cloudy 10% 1 mph NNW 78%
12 p. m. 25° Partly Cloudy 12% 2 mph NW 70%
1 p. m. 28° Partly Cloudy 13% 2 mph WNW 63%
2 p. m. 29° Partly Cloudy 14% 3 mph WNW 58%
3 p. m. 29° Partly Cloudy 17% 3 mph W 56%
4 p. m. 29° Mostly Clear 27% 3 mph SW 54%
5 p. m. 29° Mostly Clear 28% 3 mph SW 55%
6 p. m. 29° Clear 39% 2 mph WSW 59%
15-Day Forecast
Today
8/21
Mostly Cloudy
82%
19°
30°
Sat
8/22
Partly Cloudy
63%
19°
31°
Sun
8/23
Mostly Clear
6%
19°
32°
Mon
8/24
Mostly Clear
39%
18°
31°
Tue
8/25
Mostly Clear
26%
18°
31°
Wed
8/26
Heavy Rain
80%
19°
32°
Thu
8/27
Rain
73%
19°
30°
Fri
8/28
Drizzle
56%
21°
33°
Sat
8/29
Rain
73%
20°
34°
Sun
8/30
Drizzle
54%
19°
33°
Mon
8/31
Drizzle
52%
20°
37°
Tue
9/1
Drizzle
60%
22°
36°
Wed
9/2
Drizzle
60%
22°
33°
Thu
9/3
Clear
25%
21°
33°
Fri
9/4
Drizzle
60%
21°
33°
47
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
32 AQI 5.7 µg/m³
O3
Ground-level ozone
Dominant
47 AQI 51 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Sat 47 Good 47 32
Sun 44 Good 44 31
Mon 40 Good 36 40
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 vie. ago. 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
SBCAPE973 J/kg
MLCAPE750 J/kg
MUCAPE1183 J/kg
SBCIN-143 J/kg
MLCIN-119 J/kg
Lifted Index-3.6
Kinematics
0–6 km Shear19 kt
0–1 km Shear3 kt
Eff. Shear19 kt
0–1 km SRH6
0–3 km SRH91
Eff. SRH91
Storm Motion296° @ 18 kt
0–1 km EHI0.0
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index30.1
Thermo & Levels
PWAT1.72 in
0–3 km LR5.5 °C/km
700–500 LR5.3 °C/km
Total Totals46.7
LCL964 hPa
LFC783 hPa
EL207 hPa
Freezing Lvl14,491 ft