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

Lyman County, South Dakota, United States

Last updated: 5:37 PM CDT  ·  Refresh
38°C
Feels like 37°
Clear
▲ 39°  /  ▼ 20°
Wind
5 mph NNE
Humidity
20%
Dew Point
13°
Pressure
28.08 inHg
Visibility
10 mi
UV Index
6.9
Cloud Cover
6%
Sunrise
6:12 AM
Sunset
9:17 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Lyman County is currently clear at 38°C. Dry conditions are expected through the next 24 hours. Atmospheric instability is elevated (CAPE up to 1485 J/kg) — isolated convective development possible. Sunrise: 6:12AM · Sunset: 9:17PM.

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
48 AQI · Good Dominant: O3 Air Quality
Hourly Forecast · Next 24 Hours
Now
38°
3%
6 PM
38°
3%
7 PM
37°
3%
8 PM
34°
3%
9 PM
32°
3%
10 PM
30°
3%
11 PM
28°
3%
12 AM
27°
3%
1 AM
27°
3%
2 AM
26°
3%
3 AM
24°
3%
4 AM
24°
3%
5 AM
23°
3%
6 AM
20°
3%
7 AM
21°
3%
8 AM
22°
3%
9 AM
23°
3%
10 AM
26°
3%
11 AM
27°
3%
12 PM
30°
3%
1 PM
31°
3%
2 PM
32°
3%
3 PM
32°
3%
4 PM
32°
3%
7-Day Forecast
Today
39° 20°
Clear.
Sat
35° 20°
Clear.
Sun
39° 20°
Partly Cloudy with a 20% chance of rain.
Mon
38° 23°
Clear.
Tue
30° 18°
Mostly Clear.
Wed
29° 16°
Drizzle, 60% chance.
Thu
33° 17°
Mostly Clear with a 35% chance of rain.
TimeTempConditionsPrecipWindHumidity
Now 38° Clear 3% 5 mph NNE 20%
6 PM 38° Mostly Clear 3% 7 mph NNE 21%
7 PM 37° Mostly Clear 3% 9 mph NE 25%
8 PM 34° Clear 3% 10 mph NE 33%
9 PM 32° Clear 3% 10 mph ENE 40%
10 PM 30° Clear 3% 10 mph ENE 45%
11 PM 28° Clear 3% 10 mph NE 52%
12 AM 27° Clear 3% 11 mph NE 58%
1 AM 27° Clear 3% 11 mph NE 62%
2 AM 26° Clear 3% 11 mph NE 65%
3 AM 24° Mostly Clear 3% 10 mph NE 69%
4 AM 24° Mostly Clear 3% 10 mph ENE 71%
5 AM 23° Partly Cloudy 3% 9 mph ENE 70%
6 AM 20° Mostly Clear 3% 9 mph ENE 69%
7 AM 21° Clear 3% 10 mph ENE 63%
8 AM 22° Clear 3% 11 mph ENE 56%
9 AM 23° Clear 3% 11 mph ENE 48%
10 AM 26° Clear 3% 11 mph ENE 42%
11 AM 27° Clear 3% 10 mph ENE 38%
12 PM 30° Clear 3% 11 mph ENE 34%
1 PM 31° Clear 3% 11 mph ENE 32%
2 PM 32° Mostly Clear 3% 11 mph ENE 30%
3 PM 32° Mostly Clear 3% 11 mph ENE 28%
4 PM 32° Mostly Clear 3% 11 mph E 27%
15-Day Forecast
Today
7/17
Clear
3%
20°
39°
Sat
7/18
Clear
7%
20°
35°
Sun
7/19
Partly Cloudy
20%
20°
39°
Mon
7/20
Clear
16%
23°
38°
Tue
7/21
Mostly Clear
19%
18°
30°
Wed
7/22
Drizzle
60%
16°
29°
Thu
7/23
Mostly Clear
35%
17°
33°
Fri
7/24
Overcast
60%
19°
33°
Sat
7/25
Drizzle
60%
17°
34°
Sun
7/26
Drizzle
60%
17°
35°
Mon
7/27
Drizzle
60%
19°
37°
Tue
7/28
Drizzle
60%
23°
37°
Wed
7/29
Drizzle
60%
22°
36°
Thu
7/30
Drizzle
60%
22°
35°
Fri
7/31
Drizzle
60%
22°
36°
48
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
32 AQI 5.7 µg/m³
O3
Ground-level ozone
Dominant
48 AQI 52 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Sat 48 Good 48 32
Sun 40 Good 40 28
Mon 44 Good 44 33
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
SBCAPE374 J/kg
MLCAPE88 J/kg
MUCAPE374 J/kg
SBCIN0 J/kg
MLCIN0 J/kg
Lifted Index-2.2
Kinematics
0–6 km Shear12 kt
0–1 km Shear3 kt
Eff. Shear14 kt
0–1 km SRH4
0–3 km SRH-3
Eff. SRH-3
Storm Motion211° @ 12 kt
0–1 km EHI0.0
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index35.0
Thermo & Levels
PWAT1.30 in
0–3 km LR9.6 °C/km
700–500 LR6.4 °C/km
Total Totals49.1
LCL669 hPa
LFC951 hPa
EL224 hPa
Freezing Lvl14,311 ft