Flood Warning — Grant County, SD Excessive Heat Warning — Corson, SD, Campbell, SD, Walworth, SD, Dewey, SD, Potter, SD, McPherson, SD, Brown, SD, Marshall, SD, Roberts, SD, Edmunds, SD, Day, SD, Faulk, SD, Spink, SD, Grant, SD, Stanley, SD, Sully, SD, Hughes, SD, Hyde, SD, Hand, SD, Jones, SD, Lyman, SD, Buffalo, SD 10:00 PM Heat Advisory — McPherson, SD, Brown, SD, Marshall, SD, Roberts, SD, Edmunds, SD, Day, SD, Faulk, SD, Spink, SD, Grant, SD, Corson, SD, Campbell, SD, Walworth, SD, Dewey, SD, Potter, SD, Stanley, SD, Sully, SD, Hughes, SD, Hyde, SD, Hand, SD, Jones, SD, Lyman, SD, Buffalo, SD 10:00 PM

Grant County, South Dakota, United States

Last updated: 5:03 PM CDT  ·  Refresh
32°C
Feels like 33°
Clear
▲ 33°  /  ▼ 20°
Wind
7 mph SE
Humidity
42%
Dew Point
20°
Pressure
28.73 inHg
Visibility
10 mi
UV Index
7.3
Cloud Cover
7%
Sunrise
5:54 AM
Sunset
9:11 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Grant County is currently clear at 32°C. Dry conditions are expected through the next 24 hours. Atmospheric instability is elevated (CAPE up to 1374 J/kg) — isolated convective development possible. Sunrise: 5:54AM · Sunset: 9:11PM.

Alerts

Flood Warning
Grant County, SD
Expires
Excessive Heat Warning
Corson, SD, Campbell, SD, Walworth, SD, Dewey, SD, Potter, SD, McPherson, SD, Brown, SD, Marshall, SD, Roberts, SD, Edmunds, SD, Day, SD, Faulk, SD, Spink, SD, Grant, SD, Stanley, SD, Sully, SD, Hughes, SD, Hyde, SD, Hand, SD, Jones, SD, Lyman, SD, Buffalo, SD
Expires 10:00 PM
Heat Advisory
McPherson, SD, Brown, SD, Marshall, SD, Roberts, SD, Edmunds, SD, Day, SD, Faulk, SD, Spink, SD, Grant, SD, Corson, SD, Campbell, SD, Walworth, SD, Dewey, SD, Potter, SD, Stanley, SD, Sully, SD, Hughes, SD, Hyde, SD, Hand, SD, Jones, SD, Lyman, SD, Buffalo, SD
Expires 10:00 PM
34 AQI · Good Dominant: O3 Air Quality
Hourly Forecast · Next 24 Hours
Now
32°
3%
6 PM
32°
3%
7 PM
32°
3%
8 PM
29°
3%
9 PM
27°
3%
10 PM
26°
3%
11 PM
25°
3%
12 AM
24°
3%
1 AM
24°
3%
2 AM
23°
3%
3 AM
22°
3%
4 AM
22°
3%
5 AM
22°
3%
6 AM
20°
3%
7 AM
21°
3%
8 AM
23°
3%
9 AM
25°
3%
10 AM
26°
3%
11 AM
27°
3%
12 PM
28°
3%
1 PM
29°
3%
2 PM
29°
3%
3 PM
29°
3%
4 PM
32°
3%
7-Day Forecast
Today
33° 20°
Clear.
Thu
33° 20°
Clear.
Fri
35° 22°
Mostly Clear.
Sat
30° 19°
Mostly Clear.
Sun
34° 20°
Mostly Clear.
Mon
34° 19°
Clear with a 43% chance of rain.
Tue
29° 16°
Mostly Clear.
TimeTempConditionsPrecipWindHumidity
Now 32° Clear 3% 7 mph SE 42%
6 PM 32° Clear 3% 7 mph SE 40%
7 PM 32° Clear 3% 7 mph SE 43%
8 PM 29° Clear 3% 8 mph SE 52%
9 PM 27° Clear 3% 7 mph SSE 60%
10 PM 26° Clear 3% 7 mph SSE 66%
11 PM 25° Clear 3% 7 mph SSE 69%
12 AM 24° Clear 3% 6 mph S 72%
1 AM 24° Clear 3% 6 mph S 73%
2 AM 23° Clear 3% 5 mph S 74%
3 AM 22° Clear 3% 5 mph SSW 76%
4 AM 22° Clear 3% 5 mph SSW 79%
5 AM 22° Clear 3% 5 mph SSW 79%
6 AM 20° Clear 3% 5 mph SSW 80%
7 AM 21° Clear 3% 5 mph S 79%
8 AM 23° Clear 3% 4 mph S 70%
9 AM 25° Clear 3% 5 mph S 61%
10 AM 26° Clear 3% 6 mph S 52%
11 AM 27° Clear 3% 7 mph S 47%
12 PM 28° Clear 3% 7 mph S 42%
1 PM 29° Clear 3% 8 mph S 40%
2 PM 29° Clear 3% 7 mph S 39%
3 PM 29° Mostly Clear 3% 7 mph S 38%
4 PM 32° Mostly Clear 3% 7 mph S 37%
15-Day Forecast
Today
7/15
Clear
3%
20°
33°
Thu
7/16
Clear
3%
20°
33°
Fri
7/17
Mostly Clear
3%
22°
35°
Sat
7/18
Mostly Clear
3%
19°
30°
Sun
7/19
Mostly Clear
19%
20°
34°
Mon
7/20
Clear
43%
19°
34°
Tue
7/21
Mostly Clear
9%
16°
29°
Wed
7/22
Mostly Cloudy
60%
16°
29°
Thu
7/23
Drizzle
60%
17°
31°
Fri
7/24
Drizzle
60%
17°
32°
Sat
7/25
Drizzle
60%
8°
32°
Sun
7/26
Drizzle
60%
17°
32°
Mon
7/27
Drizzle
60%
18°
32°
Tue
7/28
Drizzle
60%
18°
33°
Wed
7/29
Drizzle
60%
19°
33°
34
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
33 AQI 6.1 µg/m³
O3
Ground-level ozone
Dominant
34 AQI 38 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Thu 34 Good 34 33
Fri 39 Good 39 39
Sat 51 Moderate 45 51
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 15, 20:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE1138 J/kg
MLCAPE535 J/kg
MUCAPE1138 J/kg
SBCIN0 J/kg
MLCIN0 J/kg
Lifted Index-1.3
Kinematics
0–6 km Shear32 kt
0–1 km Shear4 kt
Eff. Shear35 kt
0–1 km SRH1
0–3 km SRH-16
Eff. SRH-16
Storm Motion189° @ 25 kt
0–1 km EHI0.0
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index21.8
Thermo & Levels
PWAT1.28 in
0–3 km LR7.5 °C/km
700–500 LR4.8 °C/km
Total Totals40.7
LCL813 hPa
LFC973 hPa
EL186 hPa
Freezing Lvl16,785 ft