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

Lancaster County, South Carolina, United States

Last updated: 5:21 PM CDT  ·  Refresh
24°C
Feels like 28°
Rain
▲ 31°  /  ▼ 19°
Wind
5 mph S
Humidity
89%
Dew Point
22°
Pressure
29.35 inHg
Visibility
10 mi
UV Index
1.6
Cloud Cover
95%
Sunrise
6:47 AM
Sunset
8:03 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Lancaster County is currently rain at 25°C. Precipitation is likely — peak probability 84% around 7 PM. Atmospheric instability is elevated (CAPE up to 1286 J/kg) — isolated convective development possible. Sunrise: 6:47AM · Sunset: 8:03PM.

Alerts

Severe Thunderstorm Watch
Expires 8:00 PM
Severe Thunderstorm Watch
Expires 8:00 PM
39 AQI · Good Dominant: O3 Air Quality
Hourly Forecast · Next 24 Hours
Now
24°
83%
7 PM
25°
84%
8 PM
24°
78%
9 PM
23°
68%
10 PM
22°
69%
11 PM
22°
70%
12 AM
22°
65%
1 AM
22°
60%
2 AM
21°
41%
3 AM
21°
41%
4 AM
21°
42%
5 AM
21°
34%
6 AM
19°
34%
7 AM
19°
24%
8 AM
19°
24%
9 AM
21°
22%
10 AM
22°
25%
11 AM
23°
25%
12 PM
24°
25%
1 PM
26°
9%
2 PM
28°
10%
3 PM
29°
19%
4 PM
29°
19%
5 PM
29°
29%
7-Day Forecast
Tonight
31° 19°
Rain, 83% chance.
Sat
31° 19°
Mostly Cloudy with a 65% chance of rain.
Sun
33° 19°
Clear with a 27% chance of rain.
Mon
33° 19°
Clear with a 53% chance of rain.
Tue
32° 18°
Drizzle, 45% chance.
Wed
33° 19°
Rain, 69% chance.
Thu
31° 22°
Rain, 90% chance.
TimeTempConditionsPrecipWindHumidity
Now 24° Rain 83% 5 mph S 89%
7 PM 25° Rain 84% 7 mph ESE 93%
8 PM 24° Overcast 78% 7 mph E 95%
9 PM 23° Overcast 68% 5 mph ESE 95%
10 PM 22° Overcast 69% 6 mph ESE 96%
11 PM 22° Overcast 70% 5 mph SE 97%
12 AM 22° Mostly Cloudy 65% 4 mph SE 97%
1 AM 22° Mostly Cloudy 60% 3 mph SSE 97%
2 AM 21° Mostly Cloudy 41% 3 mph S 98%
3 AM 21° Mostly Cloudy 41% 3 mph SW 98%
4 AM 21° Mostly Cloudy 42% 2 mph SW 98%
5 AM 21° Overcast 34% 3 mph SW 98%
6 AM 19° Rain 34% 2 mph S 98%
7 AM 19° Rain 24% 3 mph SE 97%
8 AM 19° Overcast 24% 3 mph SE 95%
9 AM 21° Overcast 22% 2 mph SSW 92%
10 AM 22° Mostly Cloudy 25% 2 mph SW 88%
11 AM 23° Mostly Cloudy 25% 2 mph SW 85%
12 PM 24° Mostly Cloudy 25% 2 mph WSW 81%
1 PM 26° Mostly Cloudy 9% 3 mph WSW 76%
2 PM 28° Mostly Cloudy 10% 3 mph WSW 72%
3 PM 29° Partly Cloudy 19% 4 mph WSW 67%
4 PM 29° Partly Cloudy 19% 4 mph WSW 63%
5 PM 29° Partly Cloudy 29% 4 mph WSW 61%
15-Day Forecast
Today
8/21
Rain
83%
19°
31°
Sat
8/22
Mostly Cloudy
65%
19°
31°
Sun
8/23
Clear
27%
19°
33°
Mon
8/24
Clear
53%
19°
33°
Tue
8/25
Drizzle
45%
18°
32°
Wed
8/26
Rain
69%
19°
33°
Thu
8/27
Rain
90%
22°
31°
Fri
8/28
Drizzle
56%
19°
33°
Sat
8/29
Drizzle
54%
21°
31°
Sun
8/30
Drizzle
54%
19°
34°
Mon
8/31
Drizzle
60%
18°
34°
Tue
9/1
Drizzle
60%
22°
35°
Wed
9/2
Drizzle
60%
22°
34°
Thu
9/3
Drizzle
60%
21°
34°
Fri
9/4
Rain
90%
21°
33°
39
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
30 AQI 5.4 µg/m³
O3
Ground-level ozone
Dominant
39 AQI 43 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Sat 39 Good 39 30
Sun 42 Good 42 22
Mon 36 Good 36 28
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, 21:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE875 J/kg
MLCAPE1053 J/kg
MUCAPE1501 J/kg
SBCIN-50 J/kg
MLCIN-38 J/kg
Lifted Index-2.7
Kinematics
0–6 km Shear13 kt
0–1 km Shear14 kt
Eff. Shear15 kt
0–1 km SRH33
0–3 km SRH71
Eff. SRH71
Storm Motion319° @ 9 kt
0–1 km EHI0.2
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index32.8
Thermo & Levels
PWAT1.90 in
0–3 km LR5.7 °C/km
700–500 LR5.2 °C/km
Total Totals43.3
LCL954 hPa
LFC812 hPa
EL193 hPa
Freezing Lvl14,291 ft