Heat Advisory — McPherson, SD, Brown, SD, Marshall, SD, Roberts, SD, Edmunds, SD, Day, SD, Clark, SD, Grant, SD, Deuel, SD, Corson, SD, Campbell, SD, Walworth, SD, Dewey, SD, Potter, SD, Faulk, SD, Spink, 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: 5:18 PM CDT  ·  Refresh
36°C
Feels like 36°
Mostly Clear
▲ 37°  /  ▼ 21°
Wind
15 mph SSE
Humidity
28%
Dew Point
16°
Pressure
27.78 inHg
Visibility
10 mi
UV Index
7.1
Cloud Cover
17%
Sunrise
6:21 AM
Sunset
9:11 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Walworth County is currently mostly clear at 36°C. Precipitation is likely — peak probability 76% around 10 AM. Atmospheric instability is elevated (CAPE up to 1421 J/kg) — isolated convective development possible. Sunrise: 6:21AM · Sunset: 9:11PM.

Alerts

Heat Advisory
McPherson, SD, Brown, SD, Marshall, SD, Roberts, SD, Edmunds, SD, Day, SD, Clark, SD, Grant, SD, Deuel, SD, Corson, SD, Campbell, SD, Walworth, SD, Dewey, SD, Potter, SD, Faulk, SD, Spink, SD, Stanley, SD, Sully, SD, Hughes, SD, Hyde, SD, Hand, SD, Jones, SD, Lyman, SD, Buffalo, SD
Expires 9:00 PM
61 AQI · Moderate Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
36°
8%
6 PM
36°
26%
7 PM
34°
26%
8 PM
32°
26%
9 PM
30°
26%
10 PM
28°
26%
11 PM
28°
26%
12 AM
27°
20%
1 AM
27°
24%
2 AM
26°
29%
3 AM
25°
33%
4 AM
24°
52%
5 AM
23°
53%
6 AM
21°
57%
7 AM
21°
68%
8 AM
21°
71%
9 AM
22°
75%
10 AM
22°
76%
11 AM
22°
72%
12 PM
23°
63%
1 PM
24°
63%
2 PM
26°
66%
3 PM
26°
63%
4 PM
26°
67%
7-Day Forecast
Today
37° 21°
Partly Cloudy with a 26% chance of rain.
Thu
32° 19°
Mostly Cloudy with a 74% chance of rain.
Fri
30° 16°
Mostly Clear with a 24% chance of rain.
Sat
32° 14°
Clear.
Sun
37° 17°
Clear.
Mon
34° 19°
Mostly Clear.
Tue
27° 12°
Mostly Clear.
TimeTempConditionsPrecipWindHumidity
Now 36° Mostly Clear 8% 15 mph SSE 28%
6 PM 36° Partly Cloudy 26% 14 mph SSE 28%
7 PM 34° Mostly Cloudy 26% 13 mph SSE 31%
8 PM 32° Mostly Cloudy 26% 11 mph SSE 35%
9 PM 30° Mostly Cloudy 26% 10 mph SSE 39%
10 PM 28° Partly Cloudy 26% 10 mph SE 42%
11 PM 28° Mostly Cloudy 26% 11 mph SSE 46%
12 AM 27° Overcast 20% 11 mph SSE 49%
1 AM 27° Overcast 24% 10 mph SSE 53%
2 AM 26° Overcast 29% 10 mph SSE 58%
3 AM 25° Overcast 33% 9 mph S 64%
4 AM 24° Overcast 52% 8 mph S 68%
5 AM 23° Rain 53% 6 mph S 74%
6 AM 21° Rain 57% 6 mph S 80%
7 AM 21° Rain 68% 7 mph SE 83%
8 AM 21° Rain 71% 8 mph SSE 82%
9 AM 22° Rain 75% 8 mph SSE 82%
10 AM 22° Heavy Rain 76% 8 mph SSE 81%
11 AM 22° Heavy Rain 72% 6 mph SSE 78%
12 PM 23° Mostly Cloudy 63% 6 mph S 75%
1 PM 24° Mostly Cloudy 63% 6 mph S 72%
2 PM 26° Partly Cloudy 66% 5 mph SSE 68%
3 PM 26° Partly Cloudy 63% 5 mph SSE 64%
4 PM 26° Partly Cloudy 67% 4 mph ESE 61%
15-Day Forecast
Today
7/29
Partly Cloudy
26%
21°
37°
Thu
7/30
Mostly Cloudy
74%
19°
32°
Fri
7/31
Mostly Clear
24%
16°
30°
Sat
8/1
Clear
7%
14°
32°
Sun
8/2
Clear
3%
17°
37°
Mon
8/3
Mostly Clear
17%
19°
34°
Tue
8/4
Mostly Clear
17%
12°
27°
Wed
8/5
Clear
18%
11°
28°
Thu
8/6
Partly Cloudy
25%
14°
30°
Fri
8/7
Drizzle
51%
18°
32°
Sat
8/8
Drizzle
60%
13°
31°
Sun
8/9
Drizzle
60%
18°
30°
Mon
8/10
Drizzle
60%
18°
31°
Tue
8/11
Drizzle
60%
19°
32°
Wed
8/12
Drizzle
60%
19°
32°
61
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
61 AQI 14.7 µg/m³
O3
Ground-level ozone
50 AQI 55 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Thu 61 Moderate 50 61
Fri 54 Moderate 44 54
Sat 57 Moderate 44 57
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 Wed Jul 29, 21:00'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
SBCAPE1241 J/kg
MLCAPE1282 J/kg
MUCAPE1414 J/kg
SBCIN0 J/kg
MLCIN0 J/kg
Lifted Index-4.7
Kinematics
0–6 km Shear29 kt
0–1 km Shear3 kt
Eff. Shear29 kt
0–1 km SRH12
0–3 km SRH-15
Eff. SRH-15
Storm Motion225° @ 20 kt
0–1 km EHI0.1
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index39.6
Thermo & Levels
PWAT1.42 in
0–3 km LR9.1 °C/km
700–500 LR6.8 °C/km
Total Totals54.3
LCL707 hPa
LFC941 hPa
EL215 hPa
Freezing Lvl13,983 ft