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: 5:35 PM CDT  ·  Refresh
33°C
Feels like 34°
Mostly Clear
▲ 36°  /  ▼ 17°
Wind
7 mph NW
Humidity
38%
Dew Point
20°
Pressure
28.05 inHg
Visibility
10 mi
UV Index
6.8
Cloud Cover
13%
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 34°C. Dry conditions are expected through the next 24 hours. Atmospheric instability is elevated (CAPE up to 2261 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°
5%
6 PM
34°
18%
7 PM
32°
18%
8 PM
30°
18%
9 PM
27°
18%
10 PM
26°
8%
11 PM
24°
8%
12 AM
24°
3%
1 AM
23°
3%
2 AM
22°
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
21°
3%
10 AM
23°
3%
11 AM
24°
3%
12 PM
26°
3%
1 PM
27°
3%
2 PM
28°
3%
3 PM
28°
3%
4 PM
28°
3%
7-Day Forecast
Today
36° 17°
Mostly Clear.
Sat
32° 17°
Mostly Clear.
Sun
34° 18°
Partly Cloudy with a 49% chance of rain.
Mon
34° 19°
Mostly Clear with a 33% chance of rain.
Tue
27° 15°
Clear.
Wed
28° 13°
Clear.
Thu
30° 17°
Mostly Clear.
TimeTempConditionsPrecipWindHumidity
Now 33° Mostly Clear 5% 7 mph NW 38%
6 PM 34° Mostly Clear 18% 7 mph NNW 38%
7 PM 32° Mostly Clear 18% 7 mph N 44%
8 PM 30° Mostly Clear 18% 8 mph NNE 54%
9 PM 27° Mostly Clear 18% 10 mph NNE 63%
10 PM 26° Mostly Clear 8% 11 mph NE 69%
11 PM 24° Mostly Clear 8% 11 mph NE 70%
12 AM 24° Mostly Clear 3% 11 mph NE 69%
1 AM 23° Mostly Clear 3% 10 mph NE 71%
2 AM 22° Partly Cloudy 3% 10 mph NE 74%
3 AM 21° Partly Cloudy 3% 10 mph ENE 77%
4 AM 20° Partly Cloudy 3% 10 mph ENE 78%
5 AM 17° Partly Cloudy 3% 9 mph ENE 79%
6 AM 17° Partly Cloudy 3% 9 mph ENE 80%
7 AM 18° Partly Cloudy 3% 10 mph ENE 75%
8 AM 20° Mostly Clear 3% 10 mph ENE 64%
9 AM 21° Mostly Clear 3% 10 mph ENE 53%
10 AM 23° Clear 3% 10 mph ENE 45%
11 AM 24° Clear 3% 9 mph ENE 39%
12 PM 26° Clear 3% 9 mph ENE 34%
1 PM 27° Clear 3% 9 mph ENE 32%
2 PM 28° Clear 3% 9 mph ENE 32%
3 PM 28° Mostly Clear 3% 9 mph ENE 31%
4 PM 28° Mostly Clear 3% 9 mph ENE 31%
15-Day Forecast
Today
7/17
Mostly Clear
18%
17°
36°
Sat
7/18
Mostly Clear
3%
17°
32°
Sun
7/19
Partly Cloudy
49%
18°
34°
Mon
7/20
Mostly Clear
33%
19°
34°
Tue
7/21
Clear
3%
15°
27°
Wed
7/22
Clear
19%
13°
28°
Thu
7/23
Mostly Clear
19%
17°
30°
Fri
7/24
Mostly Cloudy
60%
17°
31°
Sat
7/25
Drizzle
60%
17°
31°
Sun
7/26
Drizzle
60%
18°
32°
Mon
7/27
Drizzle
60%
16°
33°
Tue
7/28
Drizzle
60%
19°
33°
Wed
7/29
Drizzle
60%
19°
33°
Thu
7/30
Drizzle
60%
18°
33°
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, 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
SBCAPE2320 J/kg
MLCAPE2353 J/kg
MUCAPE2987 J/kg
SBCIN0 J/kg
MLCIN0 J/kg
Lifted Index-6.2
Kinematics
0–6 km Shear11 kt
0–1 km Shear2 kt
Eff. Shear15 kt
0–1 km SRH-4
0–3 km SRH-1
Eff. SRH-1
Storm Motion233° @ 14 kt
0–1 km EHI-0.1
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index38.4
Thermo & Levels
PWAT1.66 in
0–3 km LR8.2 °C/km
700–500 LR6.5 °C/km
Total Totals52.2
LCL776 hPa
LFC950 hPa
EL164 hPa
Freezing Lvl14,121 ft