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

Brown County, South Dakota, United States

Last updated: 5:18 PM CDT  ·  Refresh
36°C
Feels like 35°
Mostly Clear
▲ 37°  /  ▼ 21°
Wind
12 mph S
Humidity
30%
Dew Point
18°
Pressure
28.48 inHg
Visibility
10 mi
UV Index
7.0
Cloud Cover
13%
Sunrise
6:13 AM
Sunset
9:05 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Brown County is currently mostly clear at 35°C. Precipitation is likely — peak probability 79% around 5 PM. Atmospheric instability is elevated (CAPE up to 1853 J/kg) — isolated convective development possible. Sunrise: 6:13AM · Sunset: 9:05PM.

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
60 AQI · Moderate Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
36°
3%
6 PM
36°
21%
7 PM
34°
21%
8 PM
32°
23%
9 PM
29°
23%
10 PM
27°
23%
11 PM
26°
26%
12 AM
26°
27%
1 AM
25°
22%
2 AM
25°
27%
3 AM
24°
35%
4 AM
23°
35%
5 AM
23°
35%
6 AM
21°
38%
7 AM
21°
55%
8 AM
21°
62%
9 AM
22°
61%
10 AM
23°
57%
11 AM
24°
63%
12 PM
26°
63%
1 PM
27°
64%
2 PM
27°
69%
3 PM
26°
70%
4 PM
26°
70%
7-Day Forecast
Today
37° 21°
Partly Cloudy with a 26% chance of rain.
Thu
32° 18°
Heavy Rain, 79% chance.
Fri
29° 17°
Mostly Clear with a 20% chance of rain.
Sat
30° 12°
Mostly Clear.
Sun
34° 17°
Mostly Clear.
Mon
34° 18°
Drizzle, 60% chance.
Tue
27° 12°
Partly Cloudy with a 28% chance of rain.
TimeTempConditionsPrecipWindHumidity
Now 36° Mostly Clear 3% 12 mph S 30%
6 PM 36° Partly Cloudy 21% 11 mph S 28%
7 PM 34° Partly Cloudy 21% 10 mph S 31%
8 PM 32° Mostly Cloudy 23% 9 mph S 36%
9 PM 29° Partly Cloudy 23% 8 mph S 42%
10 PM 27° Partly Cloudy 23% 8 mph S 46%
11 PM 26° Partly Cloudy 26% 9 mph S 49%
12 AM 26° Mostly Cloudy 27% 9 mph SSE 51%
1 AM 25° Mostly Cloudy 22% 9 mph SSE 54%
2 AM 25° Mostly Cloudy 27% 9 mph S 60%
3 AM 24° Mostly Cloudy 35% 9 mph S 65%
4 AM 23° Mostly Cloudy 35% 9 mph S 70%
5 AM 23° Mostly Cloudy 35% 8 mph S 77%
6 AM 21° Mostly Cloudy 38% 7 mph SSE 83%
7 AM 21° Mostly Cloudy 55% 6 mph S 87%
8 AM 21° Mostly Cloudy 62% 5 mph S 84%
9 AM 22° Mostly Cloudy 61% 8 mph SSW 81%
10 AM 23° Rain 57% 8 mph SSW 78%
11 AM 24° Mostly Cloudy 63% 8 mph SSW 72%
12 PM 26° Mostly Cloudy 63% 9 mph SSW 67%
1 PM 27° Partly Cloudy 64% 9 mph SSW 64%
2 PM 27° Mostly Cloudy 69% 9 mph SSW 68%
3 PM 26° Heavy Rain 70% 10 mph SW 71%
4 PM 26° Heavy Rain 70% 10 mph SW 75%
15-Day Forecast
Today
7/29
Partly Cloudy
26%
21°
37°
Thu
7/30
Heavy Rain
79%
18°
32°
Fri
7/31
Mostly Clear
20%
17°
29°
Sat
8/1
Mostly Clear
14%
12°
30°
Sun
8/2
Mostly Clear
8%
17°
34°
Mon
8/3
Drizzle
60%
18°
34°
Tue
8/4
Partly Cloudy
28%
12°
27°
Wed
8/5
Clear
18%
10°
28°
Thu
8/6
Mostly Clear
18%
13°
31°
Fri
8/7
Drizzle
51%
17°
32°
Sat
8/8
Drizzle
51%
13°
31°
Sun
8/9
Drizzle
60%
18°
30°
Mon
8/10
Drizzle
60%
17°
30°
Tue
8/11
Drizzle
60%
18°
31°
Wed
8/12
Drizzle
60%
18°
32°
60
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
60 AQI 14.0 µg/m³
O3
Ground-level ozone
50 AQI 55 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Thu 60 Moderate 50 60
Fri 52 Moderate 43 52
Sat 56 Moderate 44 56
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
SBCAPE1691 J/kg
MLCAPE1582 J/kg
MUCAPE1705 J/kg
SBCIN0 J/kg
MLCIN0 J/kg
Lifted Index-5.5
Kinematics
0–6 km Shear27 kt
0–1 km Shear5 kt
Eff. Shear27 kt
0–1 km SRH25
0–3 km SRH-11
Eff. SRH-11
Storm Motion242° @ 19 kt
0–1 km EHI0.3
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index26.8
Thermo & Levels
PWAT1.30 in
0–3 km LR8.6 °C/km
700–500 LR6.8 °C/km
Total Totals51.3
LCL755 hPa
LFC964 hPa
EL199 hPa
Freezing Lvl14,603 ft