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

Union County, South Carolina, United States

Last updated: 4:12 PM CDT  ·  Refresh
29°C
Feels like 31°
Mostly Cloudy
▲ 31°  /  ▼ 19°
Wind
4 mph ESE
Humidity
54%
Dew Point
22°
Pressure
29.38 inHg
Visibility
10 mi
UV Index
5.2
Cloud Cover
67%
Sunrise
6:51 AM
Sunset
8:07 PM
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WeatherAI™ Analysis

WeatherAI Analysis: Union County is currently mostly cloudy at 30°C. Precipitation is likely — peak probability 75% around 9 PM. Atmospheric instability is elevated (CAPE up to 1430 J/kg) — isolated convective development possible. Sunrise: 6:51AM · Sunset: 8:07PM.

Alerts

Severe Thunderstorm Watch
Expires 8:00 PM
Severe Thunderstorm Watch
Expires 8:00 PM
47 AQI · Good Dominant: O3 Air Quality
Hourly Forecast · Next 24 Hours
Now
29°
62%
6 PM
29°
64%
7 PM
27°
68%
8 PM
25°
71%
9 PM
24°
75%
10 PM
22°
73%
11 PM
22°
60%
12 AM
22°
60%
1 AM
22°
51%
2 AM
22°
22%
3 AM
21°
11%
4 AM
21°
11%
5 AM
21°
11%
6 AM
19°
8%
7 AM
19°
8%
8 AM
20°
8%
9 AM
21°
8%
10 AM
22°
8%
11 AM
23°
13%
12 PM
26°
13%
1 PM
27°
13%
2 PM
29°
13%
3 PM
29°
13%
4 PM
29°
26%
7-Day Forecast
Today
31° 19°
Mostly Cloudy with a 71% chance of rain.
Sat
33° 19°
Mostly Cloudy with a 29% chance of rain.
Sun
34° 19°
Clear.
Mon
32° 18°
Partly Cloudy with a 45% chance of rain.
Tue
32° 18°
Clear.
Wed
34° 19°
Heavy Rain, 82% chance.
Thu
31° 21°
Rain, 82% chance.
TimeTempConditionsPrecipWindHumidity
Now 29° Mostly Cloudy 62% 4 mph ESE 54%
6 PM 29° Partly Cloudy 64% 6 mph SE 66%
7 PM 27° Mostly Cloudy 68% 6 mph SE 78%
8 PM 25° Mostly Cloudy 71% 6 mph SE 88%
9 PM 24° Mostly Cloudy 75% 6 mph E 90%
10 PM 22° Drizzle 73% 5 mph E 93%
11 PM 22° Rain 60% 5 mph E 95%
12 AM 22° Overcast 60% 4 mph E 96%
1 AM 22° Overcast 51% 4 mph ENE 96%
2 AM 22° Overcast 22% 3 mph ENE 96%
3 AM 21° Mostly Cloudy 11% 2 mph NE 96%
4 AM 21° Mostly Cloudy 11% 2 mph NNE 97%
5 AM 21° Mostly Cloudy 11% 2 mph N 97%
6 AM 19° Partly Cloudy 8% 2 mph NE 96%
7 AM 19° Mostly Cloudy 8% 2 mph ENE 96%
8 AM 20° Mostly Cloudy 8% 3 mph ENE 94%
9 AM 21° Mostly Cloudy 8% 2 mph NE 90%
10 AM 22° Overcast 8% 2 mph NE 86%
11 AM 23° Overcast 13% 2 mph NE 81%
12 PM 26° Mostly Cloudy 13% 2 mph NE 74%
1 PM 27° Partly Cloudy 13% 2 mph NNE 68%
2 PM 29° Partly Cloudy 13% 2 mph N 62%
3 PM 29° Partly Cloudy 13% 2 mph NNE 59%
4 PM 29° Partly Cloudy 26% 2 mph NNE 56%
15-Day Forecast
Today
8/21
Mostly Cloudy
71%
19°
31°
Sat
8/22
Mostly Cloudy
29%
19°
33°
Sun
8/23
Clear
7%
19°
34°
Mon
8/24
Partly Cloudy
45%
18°
32°
Tue
8/25
Clear
16%
18°
32°
Wed
8/26
Heavy Rain
82%
19°
34°
Thu
8/27
Rain
82%
21°
31°
Fri
8/28
Drizzle
53%
19°
35°
Sat
8/29
Rain
68%
21°
32°
Sun
8/30
Rain
68%
19°
34°
Mon
8/31
Drizzle
60%
20°
34°
Tue
9/1
Drizzle
60%
22°
36°
Wed
9/2
Drizzle
60%
22°
35°
Thu
9/3
Clear
60%
21°
34°
Fri
9/4
Drizzle
60%
21°
34°
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 Fri Aug 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
SBCAPE1750 J/kg
MLCAPE1126 J/kg
MUCAPE1750 J/kg
SBCIN-30 J/kg
MLCIN-67 J/kg
Lifted Index-5.8
Kinematics
0–6 km Shear15 kt
0–1 km Shear7 kt
Eff. Shear16 kt
0–1 km SRH12
0–3 km SRH70
Eff. SRH70
Storm Motion280° @ 20 kt
0–1 km EHI0.1
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index36.9
Thermo & Levels
PWAT2.05 in
0–3 km LR6.8 °C/km
700–500 LR6.1 °C/km
Total Totals48.5
LCL888 hPa
LFC800 hPa
EL166 hPa
Freezing Lvl14,029 ft