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

Walworth County, South Dakota, United States

Last updated: 5:40 PM CDT  ·  Refresh
31°C
Feels like 31°
Mostly Clear
▲ 33°  /  ▼ 16°
Wind
11 mph NNE
Humidity
39%
Dew Point
18°
Pressure
27.88 inHg
Visibility
10 mi
UV Index
6.8
Cloud Cover
14%
Sunrise
6:08 AM
Sunset
9:23 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Walworth County is currently mostly clear at 31°C. Dry conditions are expected through the next 24 hours. Atmospheric instability is elevated (CAPE up to 506 J/kg) — isolated convective development possible. Sunrise: 6:08AM · Sunset: 9:23PM.

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
42 AQI · Good Dominant: O3 Air Quality
Hourly Forecast · Next 24 Hours
Now
31°
3%
6 PM
32°
3%
7 PM
31°
3%
8 PM
29°
3%
9 PM
27°
3%
10 PM
24°
3%
11 PM
23°
3%
12 AM
22°
3%
1 AM
21°
3%
2 AM
19°
3%
3 AM
19°
3%
4 AM
18°
3%
5 AM
18°
3%
6 AM
16°
3%
7 AM
17°
3%
8 AM
20°
3%
9 AM
22°
3%
10 AM
22°
3%
11 AM
23°
3%
12 PM
27°
3%
1 PM
27°
3%
2 PM
30°
3%
3 PM
31°
3%
4 PM
31°
3%
7-Day Forecast
Today
33° 16°
Clear.
Sat
33° 16°
Partly Cloudy.
Sun
37° 20°
Partly Cloudy with a 27% chance of rain.
Mon
34° 19°
Clear.
Tue
27° 17°
Clear.
Wed
29° 14°
Mostly Clear.
Thu
31° 18°
Clear.
TimeTempConditionsPrecipWindHumidity
Now 31° Mostly Clear 3% 11 mph NNE 39%
6 PM 32° Clear 3% 10 mph NNE 38%
7 PM 31° Clear 3% 10 mph NNE 42%
8 PM 29° Clear 3% 9 mph NNE 47%
9 PM 27° Clear 3% 9 mph NE 53%
10 PM 24° Clear 3% 8 mph NE 59%
11 PM 23° Clear 3% 8 mph NE 65%
12 AM 22° Clear 3% 8 mph NE 71%
1 AM 21° Mostly Clear 3% 8 mph ENE 76%
2 AM 19° Partly Cloudy 3% 8 mph ENE 81%
3 AM 19° Partly Cloudy 3% 8 mph ENE 86%
4 AM 18° Mostly Clear 3% 8 mph E 87%
5 AM 18° Mostly Clear 3% 7 mph E 86%
6 AM 16° Partly Cloudy 3% 7 mph E 86%
7 AM 17° Partly Cloudy 3% 7 mph ESE 78%
8 AM 20° Partly Cloudy 3% 8 mph ESE 65%
9 AM 22° Partly Cloudy 3% 8 mph ESE 52%
10 AM 22° Partly Cloudy 3% 8 mph ESE 43%
11 AM 23° Partly Cloudy 3% 8 mph ESE 36%
12 PM 27° Partly Cloudy 3% 8 mph ESE 31%
1 PM 27° Partly Cloudy 3% 8 mph E 30%
2 PM 30° Mostly Clear 3% 8 mph E 29%
3 PM 31° Mostly Clear 3% 8 mph E 28%
4 PM 31° Mostly Clear 3% 8 mph E 28%
15-Day Forecast
Today
7/17
Clear
3%
16°
33°
Sat
7/18
Partly Cloudy
7%
16°
33°
Sun
7/19
Partly Cloudy
27%
20°
37°
Mon
7/20
Clear
8%
19°
34°
Tue
7/21
Clear
3%
17°
27°
Wed
7/22
Mostly Clear
19%
14°
29°
Thu
7/23
Clear
19%
18°
31°
Fri
7/24
Overcast
60%
18°
31°
Sat
7/25
Drizzle
60%
18°
32°
Sun
7/26
Drizzle
60%
18°
33°
Mon
7/27
Drizzle
60%
18°
34°
Tue
7/28
Drizzle
60%
21°
35°
Wed
7/29
Drizzle
60%
20°
33°
Thu
7/30
Drizzle
60%
19°
33°
Fri
7/31
Drizzle
60%
20°
33°
42
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
37 AQI 6.7 µg/m³
O3
Ground-level ozone
Dominant
42 AQI 45 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Sat 42 Good 42 37
Sun 41 Good 41 36
Mon 42 Good 37 42
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
SBCAPE1066 J/kg
MLCAPE660 J/kg
MUCAPE1066 J/kg
SBCIN0 J/kg
MLCIN0 J/kg
Lifted Index-4.2
Kinematics
0–6 km Shear25 kt
0–1 km Shear3 kt
Eff. Shear25 kt
0–1 km SRH17
0–3 km SRH-0
Eff. SRH-0
Storm Motion214° @ 12 kt
0–1 km EHI0.1
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index34.9
Thermo & Levels
PWAT1.69 in
0–3 km LR7.6 °C/km
700–500 LR6.9 °C/km
Total Totals48.8
LCL775 hPa
LFC944 hPa
EL193 hPa
Freezing Lvl13,602 ft