Flood Warning — Grant County, SD 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

Grant County, South Dakota, United States

Last updated: 5:40 PM CDT  ·  Refresh
34°C
Feels like 36°
Mostly Clear
▲ 36°  /  ▼ 16°
Wind
7 mph NNW
Humidity
43%
Dew Point
22°
Pressure
28.54 inHg
Visibility
10 mi
UV Index
6.6
Cloud Cover
17%
Sunrise
5:55 AM
Sunset
9:09 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Grant County is currently mostly clear at 34°C. Dry conditions are expected through the next 24 hours. Atmospheric instability is elevated (CAPE up to 2939 J/kg) — isolated convective development possible. Sunrise: 5:55AM · Sunset: 9:09PM.

Alerts

Flood Warning
Grant County, SD
Expires
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
54 AQI · Moderate Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
34°
5%
6 PM
33°
15%
7 PM
31°
9%
8 PM
28°
5%
9 PM
26°
5%
10 PM
24°
3%
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
16°
3%
7 AM
17°
3%
8 AM
19°
3%
9 AM
20°
3%
10 AM
22°
3%
11 AM
23°
3%
12 PM
25°
3%
1 PM
26°
3%
2 PM
27°
3%
3 PM
27°
3%
4 PM
27°
3%
7-Day Forecast
Today
36° 16°
Mostly Clear.
Sat
31° 16°
Partly Cloudy.
Sun
32° 18°
Partly Cloudy.
Mon
33° 19°
Mostly Clear with a 22% chance of rain.
Tue
26° 14°
Mostly Clear.
Wed
28° 13°
Clear.
Thu
29° 17°
Mostly Clear.
TimeTempConditionsPrecipWindHumidity
Now 34° Mostly Clear 5% 7 mph NNW 43%
6 PM 33° Partly Cloudy 15% 9 mph N 43%
7 PM 31° Partly Cloudy 9% 10 mph N 52%
8 PM 28° Partly Cloudy 5% 10 mph N 60%
9 PM 26° Partly Cloudy 5% 9 mph N 65%
10 PM 24° Partly Cloudy 3% 8 mph N 68%
11 PM 23° Partly Cloudy 3% 7 mph N 72%
12 AM 22° Mostly Clear 3% 7 mph N 76%
1 AM 21° Mostly Clear 3% 6 mph N 80%
2 AM 20° Mostly Clear 3% 6 mph N 83%
3 AM 19° Partly Cloudy 3% 5 mph NNW 86%
4 AM 18° Partly Cloudy 3% 5 mph NNW 87%
5 AM 16° Mostly Clear 3% 5 mph NNW 88%
6 AM 16° Mostly Clear 3% 5 mph NNW 88%
7 AM 17° Mostly Clear 3% 5 mph N 82%
8 AM 19° Mostly Clear 3% 5 mph NNE 72%
9 AM 20° Mostly Clear 3% 6 mph NNE 62%
10 AM 22° Mostly Clear 3% 7 mph NNE 53%
11 AM 23° Mostly Clear 3% 7 mph NNE 47%
12 PM 25° Mostly Clear 3% 7 mph NNE 42%
1 PM 26° Mostly Clear 3% 7 mph NNE 40%
2 PM 27° Mostly Clear 3% 7 mph NNE 40%
3 PM 27° Partly Cloudy 3% 7 mph NNE 40%
4 PM 27° Partly Cloudy 3% 7 mph NE 40%
15-Day Forecast
Today
7/17
Mostly Clear
5%
16°
36°
Sat
7/18
Partly Cloudy
3%
16°
31°
Sun
7/19
Partly Cloudy
16%
18°
32°
Mon
7/20
Mostly Clear
22%
19°
33°
Tue
7/21
Mostly Clear
3%
14°
26°
Wed
7/22
Clear
9%
13°
28°
Thu
7/23
Mostly Clear
19%
17°
29°
Fri
7/24
Overcast
60%
17°
29°
Sat
7/25
Drizzle
60%
17°
30°
Sun
7/26
Drizzle
60%
18°
31°
Mon
7/27
Drizzle
60%
16°
32°
Tue
7/28
Drizzle
60%
18°
32°
Wed
7/29
Drizzle
60%
18°
31°
Thu
7/30
Drizzle
60%
18°
31°
Fri
7/31
Drizzle
60%
18°
31°
54
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
54 AQI 10.7 µg/m³
O3
Ground-level ozone
35 AQI 39 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Sat 54 Moderate 35 54
Sun 52 Moderate 27 52
Mon 53 Moderate 33 53
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
SBCAPE3248 J/kg
MLCAPE3492 J/kg
MUCAPE3848 J/kg
SBCIN0 J/kg
MLCIN0 J/kg
Lifted Index-7.2
Kinematics
0–6 km Shear15 kt
0–1 km Shear7 kt
Eff. Shear22 kt
0–1 km SRH-10
0–3 km SRH-18
Eff. SRH-18
Storm Motion239° @ 16 kt
0–1 km EHI-0.2
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index38.8
Thermo & Levels
PWAT1.88 in
0–3 km LR8.0 °C/km
700–500 LR6.3 °C/km
Total Totals52.8
LCL810 hPa
LFC967 hPa
EL151 hPa
Freezing Lvl14,911 ft