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

Dewey County, South Dakota, United States

Last updated: 5:39 PM CDT  ·  Refresh
32°C
Feels like 32°
Mostly Clear
▲ 34°  /  ▼ 16°
Wind
14 mph NE
Humidity
35%
Dew Point
16°
Pressure
27.81 inHg
Visibility
10 mi
UV Index
6.9
Cloud Cover
24%
Sunrise
5:12 AM
Sunset
8:26 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Dewey County is currently mostly clear at 32°C. Dry conditions are expected through the next 24 hours. Sunrise: 5:12AM · Sunset: 8:26PM.

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
32°
3%
5 PM
33°
8%
6 PM
32°
8%
7 PM
30°
8%
8 PM
28°
8%
9 PM
25°
8%
10 PM
24°
8%
11 PM
23°
3%
12 AM
22°
3%
1 AM
21°
3%
2 AM
20°
3%
3 AM
19°
3%
4 AM
18°
3%
5 AM
16°
3%
6 AM
18°
3%
7 AM
20°
3%
8 AM
22°
3%
9 AM
22°
3%
10 AM
24°
3%
11 AM
27°
3%
12 PM
27°
3%
1 PM
31°
3%
2 PM
31°
3%
3 PM
31°
6%
7-Day Forecast
Today
34° 16°
Mostly Clear.
Sat
34° 16°
Partly Cloudy.
Sun
38° 21°
Partly Cloudy with a 29% chance of rain.
Mon
34° 21°
Clear.
Tue
27° 17°
Clear.
Wed
29° 17°
Partly Cloudy.
Thu
32° 18°
Mostly Clear.
TimeTempConditionsPrecipWindHumidity
Now 32° Mostly Clear 3% 14 mph NE 35%
5 PM 33° Mostly Clear 8% 12 mph NE 32%
6 PM 32° Mostly Clear 8% 12 mph NNE 34%
7 PM 30° Mostly Clear 8% 11 mph NE 39%
8 PM 28° Clear 8% 11 mph NE 43%
9 PM 25° Mostly Clear 8% 10 mph NE 48%
10 PM 24° Mostly Clear 8% 10 mph NE 54%
11 PM 23° Mostly Clear 3% 10 mph NE 59%
12 AM 22° Mostly Clear 3% 9 mph ENE 65%
1 AM 21° Partly Cloudy 3% 8 mph ENE 70%
2 AM 20° Partly Cloudy 3% 7 mph ENE 75%
3 AM 19° Mostly Cloudy 3% 7 mph ENE 79%
4 AM 18° Partly Cloudy 3% 6 mph ENE 81%
5 AM 16° Partly Cloudy 3% 6 mph ENE 84%
6 AM 18° Partly Cloudy 3% 6 mph E 77%
7 AM 20° Partly Cloudy 3% 8 mph ESE 65%
8 AM 22° Partly Cloudy 3% 9 mph ESE 52%
9 AM 22° Partly Cloudy 3% 9 mph ESE 42%
10 AM 24° Partly Cloudy 3% 10 mph ESE 35%
11 AM 27° Partly Cloudy 3% 10 mph ESE 30%
12 PM 27° Partly Cloudy 3% 10 mph ESE 27%
1 PM 31° Partly Cloudy 3% 10 mph ESE 26%
2 PM 31° Partly Cloudy 3% 10 mph ESE 25%
3 PM 31° Partly Cloudy 6% 10 mph ESE 25%
15-Day Forecast
Today
7/17
Mostly Clear
8%
16°
34°
Sat
7/18
Partly Cloudy
18%
16°
34°
Sun
7/19
Partly Cloudy
29%
21°
38°
Mon
7/20
Clear
3%
21°
34°
Tue
7/21
Clear
9%
17°
27°
Wed
7/22
Partly Cloudy
19%
17°
29°
Thu
7/23
Mostly Clear
19%
18°
32°
Fri
7/24
Overcast
60%
19°
32°
Sat
7/25
Drizzle
60%
18°
32°
Sun
7/26
Drizzle
60%
18°
33°
Mon
7/27
Drizzle
60%
18°
35°
Tue
7/28
Drizzle
60%
22°
35°
Wed
7/29
Drizzle
60%
21°
34°
Thu
7/30
Drizzle
60%
21°
33°
Fri
7/31
Drizzle
60%
21°
34°
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
36 AQI 6.5 µg/m³
O3
Ground-level ozone
Dominant
42 AQI 45 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Sat 42 Good 42 36
Sun 42 Good 42 32
Mon 40 Good 40 37
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
SBCAPE700 J/kg
MLCAPE471 J/kg
MUCAPE877 J/kg
SBCIN0 J/kg
MLCIN0 J/kg
Lifted Index-3.1
Kinematics
0–6 km Shear27 kt
0–1 km Shear4 kt
Eff. Shear27 kt
0–1 km SRH13
0–3 km SRH6
Eff. SRH6
Storm Motion212° @ 12 kt
0–1 km EHI0.1
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.1
K-Index33.6
Thermo & Levels
PWAT1.71 in
0–3 km LR7.9 °C/km
700–500 LR6.7 °C/km
Total Totals47.3
LCL748 hPa
LFC942 hPa
EL209 hPa
Freezing Lvl13,740 ft