Flood Warning — Brown County, SD 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

Brown County, South Dakota, United States

Last updated: 5:39 PM CDT  ·  Refresh
32°C
Feels like 33°
Mostly Clear
▲ 33°  /  ▼ 16°
Wind
11 mph N
Humidity
46%
Dew Point
20°
Pressure
28.54 inHg
Visibility
7 mi
UV Index
6.7
Cloud Cover
19%
Sunrise
6:01 AM
Sunset
9:17 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Brown County is currently mostly clear at 32°C. Dry conditions are expected through the next 24 hours. Atmospheric instability is elevated (CAPE up to 1589 J/kg) — isolated convective development possible. Sunrise: 6:01AM · Sunset: 9:17PM.

Alerts

Flood Warning
Brown County, SD
Expires
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
40 AQI · Good Dominant: O3 Air Quality
Hourly Forecast · Next 24 Hours
Now
32°
3%
6 PM
33°
3%
7 PM
31°
3%
8 PM
29°
3%
9 PM
26°
3%
10 PM
24°
3%
11 PM
23°
3%
12 AM
22°
3%
1 AM
21°
3%
2 AM
19°
3%
3 AM
18°
3%
4 AM
18°
3%
5 AM
16°
3%
6 AM
16°
3%
7 AM
18°
3%
8 AM
20°
3%
9 AM
22°
3%
10 AM
24°
3%
11 AM
25°
3%
12 PM
28°
3%
1 PM
29°
3%
2 PM
29°
3%
3 PM
29°
3%
4 PM
29°
3%
7-Day Forecast
Today
33° 16°
Mostly Clear.
Sat
33° 16°
Mostly Clear.
Sun
36° 18°
Mostly Clear with a 26% chance of rain.
Mon
33° 19°
Mostly Clear.
Tue
28° 15°
Clear.
Wed
29° 13°
Clear.
Thu
31° 17°
Clear.
TimeTempConditionsPrecipWindHumidity
Now 32° Mostly Clear 3% 11 mph N 46%
6 PM 33° Clear 3% 12 mph N 42%
7 PM 31° Partly Cloudy 3% 11 mph N 48%
8 PM 29° Mostly Clear 3% 10 mph N 55%
9 PM 26° Mostly Clear 3% 10 mph NNE 62%
10 PM 24° Mostly Clear 3% 10 mph NNE 69%
11 PM 23° Mostly Clear 3% 9 mph NNE 76%
12 AM 22° Partly Cloudy 3% 8 mph NNE 82%
1 AM 21° Partly Cloudy 3% 8 mph NNE 86%
2 AM 19° Partly Cloudy 3% 6 mph NE 88%
3 AM 18° Partly Cloudy 3% 6 mph NE 91%
4 AM 18° Partly Cloudy 3% 5 mph NNE 92%
5 AM 16° Partly Cloudy 3% 5 mph NNE 91%
6 AM 16° Partly Cloudy 3% 4 mph NNE 91%
7 AM 18° Mostly Clear 3% 4 mph NE 83%
8 AM 20° Mostly Clear 3% 5 mph ENE 71%
9 AM 22° Mostly Clear 3% 6 mph ENE 58%
10 AM 24° Mostly Clear 3% 6 mph ENE 49%
11 AM 25° Clear 3% 5 mph ENE 43%
12 PM 28° Clear 3% 5 mph ENE 37%
1 PM 29° Clear 3% 6 mph ENE 35%
2 PM 29° Mostly Clear 3% 6 mph ENE 34%
3 PM 29° Mostly Clear 3% 6 mph ENE 33%
4 PM 29° Mostly Clear 3% 6 mph ENE 34%
15-Day Forecast
Today
7/17
Mostly Clear
3%
16°
33°
Sat
7/18
Mostly Clear
3%
16°
33°
Sun
7/19
Mostly Clear
26%
18°
36°
Mon
7/20
Mostly Clear
17%
19°
33°
Tue
7/21
Clear
3%
15°
28°
Wed
7/22
Clear
9%
13°
29°
Thu
7/23
Clear
19%
17°
31°
Fri
7/24
Mostly Cloudy
60%
17°
32°
Sat
7/25
Partly Cloudy
60%
18°
32°
Sun
7/26
Drizzle
60%
18°
33°
Mon
7/27
Drizzle
60%
17°
34°
Tue
7/28
Drizzle
60%
19°
34°
Wed
7/29
Drizzle
60%
19°
33°
Thu
7/30
Drizzle
60%
18°
33°
Fri
7/31
Drizzle
60%
19°
33°
40
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
35 AQI 6.3 µg/m³
O3
Ground-level ozone
Dominant
40 AQI 44 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Sat 40 Good 40 35
Sun 38 Good 38 27
Mon 38 Good 38 30
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 50 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE1994 J/kg
MLCAPE1077 J/kg
MUCAPE1994 J/kg
SBCIN0 J/kg
MLCIN0 J/kg
Lifted Index-6.0
Kinematics
0–6 km Shear20 kt
0–1 km Shear3 kt
Eff. Shear23 kt
0–1 km SRH12
0–3 km SRH-8
Eff. SRH-8
Storm Motion227° @ 9 kt
0–1 km EHI0.2
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index33.4
Thermo & Levels
PWAT1.65 in
0–3 km LR7.2 °C/km
700–500 LR6.9 °C/km
Total Totals48.8
LCL818 hPa
LFC966 hPa
EL172 hPa
Freezing Lvl14,659 ft