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

Dewey County, South Dakota, United States

Last updated: 5:18 PM CDT  ·  Refresh
36°C
Feels like 36°
Mostly Clear
▲ 38°  /  ▼ 20°
Wind
17 mph SSE
Humidity
25%
Dew Point
15°
Pressure
27.69 inHg
Visibility
10 mi
UV Index
7.1
Cloud Cover
25%
Sunrise
5:25 AM
Sunset
8:14 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Dewey County is currently mostly clear at 36°C. Precipitation is likely — peak probability 67% around 8 AM. Atmospheric instability is elevated (CAPE up to 1470 J/kg) — isolated convective development possible. Sunrise: 5:25AM · Sunset: 8:14PM.

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%
5 PM
36°
26%
6 PM
34°
28%
7 PM
32°
30%
8 PM
31°
30%
9 PM
29°
30%
10 PM
28°
30%
11 PM
27°
31%
12 AM
26°
50%
1 AM
25°
59%
2 AM
24°
34%
3 AM
23°
35%
4 AM
23°
38%
5 AM
20°
42%
6 AM
20°
50%
7 AM
21°
66%
8 AM
21°
67%
9 AM
23°
58%
10 AM
23°
49%
11 AM
24°
59%
12 PM
24°
59%
1 PM
26°
60%
2 PM
26°
63%
3 PM
26°
60%
7-Day Forecast
Today
38° 20°
Partly Cloudy with a 30% chance of rain.
Thu
32° 19°
Rain, 66% chance.
Fri
31° 16°
Mostly Clear.
Sat
33° 15°
Clear.
Sun
38° 18°
Mostly Clear.
Mon
34° 19°
Mostly Clear.
Tue
27° 12°
Mostly Clear.
TimeTempConditionsPrecipWindHumidity
Now 36° Mostly Clear 8% 17 mph SSE 25%
5 PM 36° Partly Cloudy 26% 16 mph SSE 25%
6 PM 34° Partly Cloudy 28% 15 mph SSE 28%
7 PM 32° Mostly Cloudy 30% 13 mph SSE 33%
8 PM 31° Mostly Cloudy 30% 12 mph SSE 38%
9 PM 29° Mostly Cloudy 30% 10 mph SSE 42%
10 PM 28° Rain 30% 11 mph S 47%
11 PM 27° Drizzle 31% 12 mph SSW 51%
12 AM 26° Rain 50% 12 mph SSW 56%
1 AM 25° Overcast 59% 8 mph S 62%
2 AM 24° Overcast 34% 6 mph SSE 66%
3 AM 23° Overcast 35% 6 mph ESE 71%
4 AM 23° Overcast 38% 4 mph E 75%
5 AM 20° Drizzle 42% 6 mph E 79%
6 AM 20° Drizzle 50% 8 mph E 81%
7 AM 21° Rain 66% 8 mph ESE 79%
8 AM 21° Rain 67% 7 mph SE 77%
9 AM 23° Rain 58% 6 mph SE 75%
10 AM 23° Mostly Cloudy 49% 5 mph SE 72%
11 AM 24° Mostly Cloudy 59% 7 mph SE 70%
12 PM 24° Mostly Cloudy 59% 8 mph SE 68%
1 PM 26° Mostly Cloudy 60% 7 mph SE 65%
2 PM 26° Partly Cloudy 63% 6 mph ESE 62%
3 PM 26° Partly Cloudy 60% 6 mph ESE 60%
15-Day Forecast
Today
7/29
Partly Cloudy
30%
20°
38°
Thu
7/30
Rain
66%
19°
32°
Fri
7/31
Mostly Clear
10%
16°
31°
Sat
8/1
Clear
3%
15°
33°
Sun
8/2
Mostly Clear
3%
18°
38°
Mon
8/3
Mostly Clear
8%
19°
34°
Tue
8/4
Mostly Clear
17%
12°
27°
Wed
8/5
Mostly Clear
18%
12°
28°
Thu
8/6
Partly Cloudy
18%
15°
31°
Fri
8/7
Clear
36%
18°
32°
Sat
8/8
Drizzle
60%
14°
32°
Sun
8/9
Drizzle
60%
19°
31°
Mon
8/10
Drizzle
60%
19°
31°
Tue
8/11
Drizzle
60%
20°
32°
Wed
8/12
Drizzle
60%
21°
33°
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 14.3 µg/m³
O3
Ground-level ozone
50 AQI 55 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Thu 61 Moderate 50 61
Fri 54 Moderate 45 54
Sat 57 Moderate 45 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
SBCAPE1143 J/kg
MLCAPE967 J/kg
MUCAPE1143 J/kg
SBCIN0 J/kg
MLCIN0 J/kg
Lifted Index-4.6
Kinematics
0–6 km Shear28 kt
0–1 km Shear2 kt
Eff. Shear27 kt
0–1 km SRH10
0–3 km SRH-14
Eff. SRH-14
Storm Motion217° @ 21 kt
0–1 km EHI0.1
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index37.9
Thermo & Levels
PWAT1.30 in
0–3 km LR9.1 °C/km
700–500 LR7.1 °C/km
Total Totals53.9
LCL693 hPa
LFC938 hPa
EL217 hPa
Freezing Lvl14,094 ft