Extreme Heat Warning — Corson, SD, Campbell, SD, McPherson, SD, Walworth, SD, Edmunds, SD, Dewey, SD, Potter, SD, Faulk, SD, Stanley, SD, Sully, SD, Hughes, SD, Hyde, SD, Hand, SD, Jones, SD, Lyman, SD, Buffalo, SD 9:00 PM Heat Advisory — Brown, SD, Marshall, SD, Roberts, SD, Day, SD, Spink, SD, Clark, SD, Codington, SD, Grant, SD, Hamlin, SD, Deuel, SD, Corson, SD, Campbell, SD, McPherson, SD, Walworth, SD, Edmunds, SD, Dewey, SD, Potter, SD, Faulk, SD, Stanley, SD, Sully, SD, Hughes, SD, Hyde, SD, Hand, SD, Jones, SD, Lyman, SD, Buffalo, SD 9:00 PM

Lyman County, South Dakota, United States

Last updated: 7:44 AM CDT  ·  Refresh
26°C
Feels like 26°
Partly Cloudy
▲ 41°  /  ▼ 25°
Wind
11 mph SSE
Humidity
61%
Dew Point
18°
Pressure
28.01 inHg
Visibility
10 mi
UV Index
3.5
Cloud Cover
46%
Sunrise
6:21 AM
Sunset
9:09 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Lyman County is currently partly cloudy at 26°C. Dry conditions are expected through the next 24 hours. Atmospheric instability is elevated (CAPE up to 2037 J/kg) — isolated convective development possible. Sunrise: 6:21AM · Sunset: 9:09PM.

Alerts

Extreme Heat Warning
Corson, SD, Campbell, SD, McPherson, SD, Walworth, SD, Edmunds, SD, Dewey, SD, Potter, SD, Faulk, SD, Stanley, SD, Sully, SD, Hughes, SD, Hyde, SD, Hand, SD, Jones, SD, Lyman, SD, Buffalo, SD
Expires 9:00 PM
Heat Advisory
Brown, SD, Marshall, SD, Roberts, SD, Day, SD, Spink, SD, Clark, SD, Codington, SD, Grant, SD, Hamlin, SD, Deuel, SD, Corson, SD, Campbell, SD, McPherson, SD, Walworth, SD, Edmunds, SD, Dewey, SD, Potter, SD, Faulk, SD, Stanley, SD, Sully, SD, Hughes, SD, Hyde, SD, Hand, SD, Jones, SD, Lyman, SD, Buffalo, SD
Expires 9:00 PM
45 AQI · Good Dominant: O3 Air Quality
Hourly Forecast · Next 24 Hours
Now
26°
13%
8 AM
27°
31%
9 AM
28°
23%
10 AM
30°
23%
11 AM
33°
21%
12 PM
34°
14%
1 PM
37°
3%
2 PM
38°
3%
3 PM
39°
3%
4 PM
38°
3%
5 PM
39°
3%
6 PM
38°
3%
7 PM
37°
3%
8 PM
34°
3%
9 PM
33°
3%
10 PM
31°
3%
11 PM
30°
3%
12 AM
29°
3%
1 AM
28°
3%
2 AM
27°
3%
3 AM
27°
5%
4 AM
27°
5%
5 AM
26°
5%
6 AM
26°
5%
7-Day Forecast
Today
41° 25°
Clear with a 23% chance of rain.
Mon
39° 26°
Partly Cloudy with a 36% chance of rain.
Tue
38° 23°
Mostly Clear with a 35% chance of rain.
Wed
37° 24°
Mostly Clear with a 81% chance of rain.
Thu
35° 22°
Drizzle, 64% chance.
Fri
34° 17°
Rain, 42% chance.
Sat
34° 18°
Clear.
TimeTempConditionsPrecipWindHumidity
Now 26° Partly Cloudy 13% 11 mph SSE 61%
8 AM 27° Mostly Clear 31% 12 mph SSE 57%
9 AM 28° Clear 23% 13 mph S 53%
10 AM 30° Clear 23% 12 mph SSW 47%
11 AM 33° Clear 21% 10 mph SSW 41%
12 PM 34° Clear 14% 9 mph SW 35%
1 PM 37° Clear 3% 7 mph W 32%
2 PM 38° Clear 3% 7 mph WNW 29%
3 PM 39° Clear 3% 8 mph NNW 28%
4 PM 38° Clear 3% 10 mph NNW 28%
5 PM 39° Clear 3% 10 mph NNW 28%
6 PM 38° Clear 3% 10 mph N 29%
7 PM 37° Clear 3% 8 mph N 31%
8 PM 34° Clear 3% 6 mph N 34%
9 PM 33° Clear 3% 6 mph N 36%
10 PM 31° Clear 3% 4 mph N 41%
11 PM 30° Clear 3% 4 mph NNE 47%
12 AM 29° Clear 3% 5 mph ENE 53%
1 AM 28° Clear 3% 4 mph NNE 56%
2 AM 27° Clear 3% 3 mph N 58%
3 AM 27° Clear 5% 4 mph N 60%
4 AM 27° Clear 5% 5 mph N 59%
5 AM 26° Mostly Clear 5% 5 mph N 57%
6 AM 26° Partly Cloudy 5% 5 mph N 56%
15-Day Forecast
Today
7/26
Clear
23%
25°
41°
Mon
7/27
Partly Cloudy
36%
26°
39°
Tue
7/28
Mostly Clear
35%
23°
38°
Wed
7/29
Mostly Clear
81%
24°
37°
Thu
7/30
Drizzle
64%
22°
35°
Fri
7/31
Rain
42%
17°
34°
Sat
8/1
Clear
19%
18°
34°
Sun
8/2
Clear
18%
23°
40°
Mon
8/3
Rain
68%
22°
42°
Tue
8/4
Clear
21%
19°
32°
Wed
8/5
Clear
25%
19°
32°
Thu
8/6
Drizzle
60%
20°
32°
Fri
8/7
Clear
60%
20°
34°
Sat
8/8
Clear
25%
21°
34°
Sun
8/9
Clear
25%
21°
33°
45
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
39 AQI 7.2 µg/m³
O3
Ground-level ozone
Dominant
45 AQI 50 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Mon 45 Good 45 39
Tue 51 Moderate 51 43
Wed 44 Good 44 43
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 Sun Jul 26, 11:00'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
SBCAPE204 J/kg
MLCAPE448 J/kg
MUCAPE944 J/kg
SBCIN-916 J/kg
MLCIN0 J/kg
Lifted Index-2.1
Kinematics
0–6 km Shear29 kt
0–1 km Shear30 kt
Eff. Shear—
0–1 km SRH156
0–3 km SRH154
Eff. SRH—
Storm Motion228° @ 29 kt
0–1 km EHI0.2
Composite Parameters
Sig. Tornado0.1
STP (eff)—
Supercell—
K-Index32.4
Thermo & Levels
PWAT1.61 in
0–3 km LR4.5 °C/km
700–500 LR8.1 °C/km
Total Totals51.4
LCL845 hPa
LFC579 hPa
EL272 hPa
Freezing Lvl14,672 ft