Severe Thunderstorm Watch 5:00 AM Severe Thunderstorm Watch 5:00 AM

Union County, South Dakota, United States

Last updated: 3:47 AM CDT  ·  Refresh
20°C
Feels like 21°
Partly Cloudy
▲ 34°  /  ▼ 20°
Wind
7 mph ESE
Humidity
92%
Dew Point
19°
Pressure
28.51 inHg
Visibility
10 mi
UV Index
0.0
Cloud Cover
47%
Sunrise
6:52 AM
Sunset
7:59 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Union County is currently partly cloudy at 20°C. Dry conditions are expected through the next 24 hours. Atmospheric instability is elevated (CAPE up to 2061 J/kg) — isolated convective development possible. Sunrise: 6:52AM · Sunset: 7:59PM.

Alerts

Severe Thunderstorm Watch
Expires 5:00 AM
Severe Thunderstorm Watch
Expires 5:00 AM
35 AQI · Good Dominant: O3 Air Quality
Hourly Forecast · Next 24 Hours
Now
20°
38%
4 AM
19°
24%
5 AM
17°
8%
6 AM
17°
7%
7 AM
18°
7%
8 AM
20°
7%
9 AM
21°
7%
10 AM
23°
4%
11 AM
26°
4%
12 PM
28°
5%
1 PM
31°
5%
2 PM
32°
8%
3 PM
33°
8%
4 PM
33°
17%
5 PM
34°
17%
6 PM
33°
18%
7 PM
31°
26%
8 PM
29°
27%
9 PM
27°
31%
10 PM
24°
32%
11 PM
24°
32%
12 AM
23°
32%
1 AM
23°
33%
2 AM
23°
33%
7-Day Forecast
Today
34° 20°
Mostly Clear with a 38% chance of rain.
Thu
38° 20°
Clear with a 36% chance of rain.
Fri
38° 22°
Clear with a 28% chance of rain.
Sat
37° 22°
Mostly Cloudy with a 47% chance of rain.
Sun
38° 21°
Drizzle, 64% chance.
Mon
38° 21°
Rain, 82% chance.
Tue
34° 18°
Drizzle, 53% chance.
TimeTempConditionsPrecipWindHumidity
Now 20° Partly Cloudy 38% 7 mph ESE 92%
4 AM 19° Mostly Clear 24% 6 mph ESE 92%
5 AM 17° Mostly Clear 8% 4 mph ESE 94%
6 AM 17° Mostly Clear 7% 4 mph ESE 95%
7 AM 18° Mostly Clear 7% 4 mph ESE 90%
8 AM 20° Mostly Clear 7% 6 mph SE 82%
9 AM 21° Clear 7% 7 mph SE 74%
10 AM 23° Clear 4% 7 mph SE 66%
11 AM 26° Clear 4% 7 mph SSE 57%
12 PM 28° Clear 5% 7 mph SSE 49%
1 PM 31° Clear 5% 7 mph S 45%
2 PM 32° Clear 8% 8 mph S 41%
3 PM 33° Clear 8% 9 mph S 38%
4 PM 33° Clear 17% 9 mph S 38%
5 PM 34° Mostly Clear 17% 8 mph S 39%
6 PM 33° Partly Cloudy 18% 8 mph S 41%
7 PM 31° Partly Cloudy 26% 7 mph SSE 48%
8 PM 29° Partly Cloudy 27% 6 mph SSE 56%
9 PM 27° Partly Cloudy 31% 6 mph SE 63%
10 PM 24° Partly Cloudy 32% 5 mph SE 68%
11 PM 24° Partly Cloudy 32% 5 mph SE 73%
12 AM 23° Rain 32% 6 mph SE 77%
1 AM 23° Rain 33% 5 mph ESE 80%
2 AM 23° Rain 33% 5 mph ESE 82%
15-Day Forecast
Today
9/2
Mostly Clear
38%
20°
34°
Thu
9/3
Clear
36%
20°
38°
Fri
9/4
Clear
28%
22°
38°
Sat
9/5
Mostly Cloudy
47%
22°
37°
Sun
9/6
Drizzle
64%
21°
38°
Mon
9/7
Rain
82%
21°
38°
Tue
9/8
Drizzle
53%
18°
34°
Wed
9/9
Drizzle
72%
14°
29°
Thu
9/10
Drizzle
44%
16°
29°
Fri
9/11
Drizzle
68%
15°
32°
Sat
9/12
Drizzle
60%
16°
31°
Sun
9/13
Drizzle
60%
15°
29°
Mon
9/14
Clear
60%
15°
29°
Tue
9/15
Drizzle
60%
16°
29°
Wed
9/16
Clear
60%
15°
29°
35
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
25 AQI 4.6 µg/m³
O3
Ground-level ozone
Dominant
35 AQI 39 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Today 35 Good 35 25
Thu 40 Good 40 26
Fri 40 Good 40 28
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 Sep 2, 07:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 50 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE35 J/kg
MLCAPE1042 J/kg
MUCAPE2226 J/kg
SBCIN-561 J/kg
MLCIN-259 J/kg
Lifted Index-0.2
Kinematics
0–6 km Shear40 kt
0–1 km Shear21 kt
Eff. Shear27 kt
0–1 km SRH117
0–3 km SRH182
Eff. SRH141
Storm Motion289° @ 29 kt
0–1 km EHI0.0
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell4.3
K-Index40.3
Thermo & Levels
PWAT1.96 in
0–3 km LR3.9 °C/km
700–500 LR6.8 °C/km
Total Totals54.9
LCL950 hPa
LFC618 hPa
EL485 hPa
Freezing Lvl13,114 ft