Extreme Heat Warning — Corson, SD, Campbell, SD, McPherson, SD, Walworth, SD, Edmunds, SD, Dewey, SD, Potter, SD, Faulk, SD, Stanley, SD, Sully, SD, Hughes, SD, Hyde, SD, Hand, SD, Jones, SD, Lyman, SD, Buffalo, SD 9:00 PM Heat Advisory — Brown, SD, Marshall, SD, Roberts, SD, Day, SD, Spink, SD, Clark, SD, Codington, SD, Grant, SD, Hamlin, SD, Deuel, SD, Corson, SD, Campbell, SD, McPherson, SD, Walworth, SD, Edmunds, SD, Dewey, SD, Potter, SD, Faulk, 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: 6:14 AM CDT  ·  Refresh
24°C
Feels like 24°
Partly Cloudy
▲ 38°  /  ▼ 22°
Wind
10 mph SSW
Humidity
70%
Dew Point
17°
Pressure
27.74 inHg
Visibility
10 mi
UV Index
0.0
Cloud Cover
58%
Sunrise
6:17 AM
Sunset
9:14 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Walworth County is currently partly cloudy at 24°C. Dry conditions are expected through the next 24 hours. Atmospheric instability is elevated (CAPE up to 1782 J/kg) — isolated convective development possible. Sunrise: 6:17AM · Sunset: 9:14PM.

Alerts

Extreme Heat Warning
Corson, SD, Campbell, SD, McPherson, SD, Walworth, SD, Edmunds, SD, Dewey, SD, Potter, SD, Faulk, SD, Stanley, SD, Sully, SD, Hughes, SD, Hyde, SD, Hand, SD, Jones, SD, Lyman, SD, Buffalo, SD
Expires 9:00 PM
Heat Advisory
Brown, SD, Marshall, SD, Roberts, SD, Day, SD, Spink, SD, Clark, SD, Codington, SD, Grant, SD, Hamlin, SD, Deuel, SD, Corson, SD, Campbell, SD, McPherson, SD, Walworth, SD, Edmunds, SD, Dewey, SD, Potter, SD, Faulk, 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
24°
21%
7 AM
21°
30%
8 AM
22°
31%
9 AM
23°
41%
10 AM
26°
20%
11 AM
28°
20%
12 PM
30°
14%
1 PM
32°
3%
2 PM
33°
3%
3 PM
35°
3%
4 PM
36°
4%
5 PM
36°
4%
6 PM
37°
5%
7 PM
37°
5%
8 PM
34°
5%
9 PM
32°
5%
10 PM
29°
5%
11 PM
28°
3%
12 AM
27°
3%
1 AM
26°
3%
2 AM
25°
3%
3 AM
24°
3%
4 AM
24°
3%
5 AM
23°
3%
7-Day Forecast
Today
38° 22°
Mostly Clear with a 41% chance of rain.
Mon
38° 22°
Partly Cloudy with a 26% chance of rain.
Tue
37° 19°
Clear.
Wed
36° 21°
Clear with a 58% chance of rain.
Thu
31° 20°
Rain, 83% chance.
Fri
32° 17°
Mostly Cloudy with a 37% chance of rain.
Sat
32° 16°
Partly Cloudy with a 21% chance of rain.
TimeTempConditionsPrecipWindHumidity
Now 24° Partly Cloudy 21% 10 mph SSW 70%
7 AM 21° Partly Cloudy 30% 8 mph SSW 66%
8 AM 22° Partly Cloudy 31% 8 mph S 64%
9 AM 23° Partly Cloudy 41% 9 mph S 61%
10 AM 26° Mostly Clear 20% 9 mph SSW 57%
11 AM 28° Mostly Clear 20% 8 mph SW 52%
12 PM 30° Mostly Clear 14% 6 mph W 47%
1 PM 32° Mostly Clear 3% 5 mph WNW 41%
2 PM 33° Clear 3% 6 mph NNW 35%
3 PM 35° Clear 3% 6 mph N 30%
4 PM 36° Clear 4% 6 mph N 26%
5 PM 36° Clear 4% 6 mph N 26%
6 PM 37° Clear 5% 6 mph N 25%
7 PM 37° Clear 5% 6 mph N 26%
8 PM 34° Clear 5% 6 mph N 28%
9 PM 32° Clear 5% 5 mph N 31%
10 PM 29° Clear 5% 6 mph N 32%
11 PM 28° Clear 3% 6 mph N 36%
12 AM 27° Clear 3% 6 mph NNE 41%
1 AM 26° Clear 3% 7 mph NNE 44%
2 AM 25° Clear 3% 6 mph NNE 46%
3 AM 24° Mostly Clear 3% 5 mph NNE 48%
4 AM 24° Mostly Clear 3% 5 mph NNE 49%
5 AM 23° Mostly Clear 3% 5 mph NNE 49%
15-Day Forecast
Today
7/26
Mostly Clear
41%
22°
38°
Mon
7/27
Partly Cloudy
26%
22°
38°
Tue
7/28
Clear
14%
19°
37°
Wed
7/29
Clear
58%
21°
36°
Thu
7/30
Rain
83%
20°
31°
Fri
7/31
Mostly Cloudy
37%
17°
32°
Sat
8/1
Partly Cloudy
21%
16°
32°
Sun
8/2
Mostly Clear
34%
19°
36°
Mon
8/3
Clear
35%
20°
35°
Tue
8/4
Mostly Clear
22%
16°
28°
Wed
8/5
Drizzle
60%
15°
29°
Thu
8/6
Drizzle
60%
18°
30°
Fri
8/7
Clear
25%
18°
32°
Sat
8/8
Drizzle
60%
19°
32°
Sun
8/9
Clear
60%
19°
31°
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
41 AQI 45 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Today 52 Moderate 41 52
Mon 47 Good 40 47
Tue 53 Moderate 49 53
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 Sun Jul 26, 09:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 50 60 70 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE48 J/kg
MLCAPE45 J/kg
MUCAPE89 J/kg
SBCIN-926 J/kg
MLCIN0 J/kg
Lifted Index-0.7
Kinematics
0–6 km Shear26 kt
0–1 km Shear13 kt
Eff. Shear14 kt
0–1 km SRH103
0–3 km SRH36
Eff. SRH18
Storm Motion234° @ 31 kt
0–1 km EHI0.0
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index32.7
Thermo & Levels
PWAT1.52 in
0–3 km LR4.6 °C/km
700–500 LR7.6 °C/km
Total Totals49.4
LCL845 hPa
LFC553 hPa
EL398 hPa
Freezing Lvl14,150 ft