Heat Advisory — Brown, SD, Marshall, SD, Roberts, SD, Walworth, SD, Edmunds, SD, Day, SD, Dewey, SD, Potter, SD, Faulk, SD, Spink, SD, Clark, SD, Codington, SD, Grant, SD, Hamlin, SD, Deuel, SD, Stanley, SD, Sully, SD, Hughes, SD, Hyde, SD, Hand, SD, Jones, SD, Lyman, SD, Buffalo, SD 9:00 PM

Clark County, South Dakota, United States

Last updated: 6:37 PM CDT  ·  Refresh
33°C
Feels like 34°
Mostly Clear
▲ 36°  /  ▼ 17°
Wind
8 mph NNW
Humidity
39%
Dew Point
20°
Pressure
28.04 inHg
Visibility
10 mi
UV Index
5.3
Cloud Cover
17%
Sunrise
6:01 AM
Sunset
9:12 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Clark County is currently mostly clear at 33°C. Dry conditions are expected through the next 24 hours. Atmospheric instability is elevated (CAPE up to 2120 J/kg) — isolated convective development possible. Sunrise: 6:01AM · Sunset: 9:12PM.

Alerts

Heat Advisory
Brown, SD, Marshall, SD, Roberts, SD, Walworth, SD, Edmunds, SD, Day, SD, Dewey, SD, Potter, SD, Faulk, SD, Spink, SD, Clark, SD, Codington, SD, Grant, SD, Hamlin, SD, Deuel, SD, Stanley, SD, Sully, SD, Hughes, SD, Hyde, SD, Hand, SD, Jones, SD, Lyman, SD, Buffalo, SD
Expires 9:00 PM
52 AQI · Moderate Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
33°
13%
7 PM
32°
24%
8 PM
30°
28%
9 PM
27°
24%
10 PM
26°
7%
11 PM
24°
7%
12 AM
23°
3%
1 AM
22°
3%
2 AM
21°
3%
3 AM
21°
3%
4 AM
20°
3%
5 AM
17°
3%
6 AM
17°
3%
7 AM
18°
3%
8 AM
20°
3%
9 AM
22°
3%
10 AM
23°
3%
11 AM
24°
3%
12 PM
26°
3%
1 PM
29°
3%
2 PM
29°
3%
3 PM
30°
3%
4 PM
29°
3%
5 PM
30°
3%
7-Day Forecast
Tonight
36° 17°
Mostly Clear with a 24% chance of rain.
Sat
32° 17°
Partly Cloudy.
Sun
34° 19°
Partly Cloudy.
Mon
35° 18°
Mostly Clear with a 42% chance of rain.
Tue
27° 14°
Clear.
Wed
28° 13°
Clear.
Thu
29° 15°
Clear with a 28% chance of rain.
TimeTempConditionsPrecipWindHumidity
Now 33° Mostly Clear 13% 8 mph NNW 39%
7 PM 32° Mostly Clear 24% 8 mph N 41%
8 PM 30° Mostly Clear 28% 9 mph NNE 50%
9 PM 27° Mostly Clear 24% 11 mph NNE 59%
10 PM 26° Mostly Clear 7% 11 mph NE 65%
11 PM 24° Mostly Clear 7% 12 mph NE 67%
12 AM 23° Mostly Clear 3% 12 mph NE 69%
1 AM 22° Mostly Clear 3% 11 mph NE 71%
2 AM 21° Mostly Clear 3% 10 mph ENE 74%
3 AM 21° Partly Cloudy 3% 10 mph ENE 77%
4 AM 20° Partly Cloudy 3% 10 mph ENE 79%
5 AM 17° Mostly Cloudy 3% 9 mph ENE 80%
6 AM 17° Mostly Cloudy 3% 9 mph ENE 81%
7 AM 18° Partly Cloudy 3% 10 mph ENE 74%
8 AM 20° Mostly Clear 3% 10 mph ENE 62%
9 AM 22° Mostly Clear 3% 10 mph ENE 50%
10 AM 23° Mostly Clear 3% 10 mph ENE 41%
11 AM 24° Mostly Clear 3% 9 mph ENE 35%
12 PM 26° Mostly Clear 3% 8 mph ENE 30%
1 PM 29° Mostly Clear 3% 8 mph ENE 28%
2 PM 29° Mostly Clear 3% 8 mph ENE 27%
3 PM 30° Mostly Clear 3% 9 mph ENE 26%
4 PM 29° Mostly Clear 3% 9 mph ENE 26%
5 PM 30° Partly Cloudy 3% 9 mph ENE 28%
15-Day Forecast
Today
7/17
Mostly Clear
24%
17°
36°
Sat
7/18
Partly Cloudy
3%
17°
32°
Sun
7/19
Partly Cloudy
14%
19°
34°
Mon
7/20
Mostly Clear
42%
18°
35°
Tue
7/21
Clear
3%
14°
27°
Wed
7/22
Clear
17%
13°
28°
Thu
7/23
Clear
28%
15°
29°
Fri
7/24
Mostly Cloudy
17%
15°
29°
Sat
7/25
Drizzle
44%
15°
31°
Sun
7/26
Rain
68%
16°
30°
Mon
7/27
Drizzle
50%
16°
32°
Tue
7/28
Drizzle
60%
19°
33°
Wed
7/29
Drizzle
60%
19°
33°
Thu
7/30
Drizzle
60%
18°
32°
Fri
7/31
Drizzle
60%
19°
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 9.4 µg/m³
O3
Ground-level ozone
33 AQI 37 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Sat 52 Moderate 33 52
Sun 41 Good 30 41
Mon 49 Good 30 49
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 Jul 17, 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
SBCAPE2253 J/kg
MLCAPE2426 J/kg
MUCAPE3109 J/kg
SBCIN0 J/kg
MLCIN0 J/kg
Lifted Index-6.2
Kinematics
0–6 km Shear11 kt
0–1 km Shear2 kt
Eff. Shear18 kt
0–1 km SRH-2
0–3 km SRH-7
Eff. SRH-7
Storm Motion229° @ 12 kt
0–1 km EHI-0.0
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index38.2
Thermo & Levels
PWAT1.67 in
0–3 km LR8.0 °C/km
700–500 LR6.6 °C/km
Total Totals52.6
LCL780 hPa
LFC950 hPa
EL166 hPa
Freezing Lvl14,163 ft