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

Union County, South Dakota, United States

Last updated: 3:05 AM CDT  ·  Refresh
19°C
Feels like 19°
Partly Cloudy
▲ 34°  /  ▼ 19°
Wind
10 mph ENE
Humidity
92%
Dew Point
19°
Pressure
28.51 inHg
Visibility
3 mi
UV Index
0.0
Cloud Cover
50%
Sunrise
6:52 AM
Sunset
7:59 PM
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WeatherAI™ Analysis

WeatherAI Analysis: Union County is currently partly cloudy at 20°C. Precipitation is likely — peak probability 60% around 3 AM. Atmospheric instability is elevated (CAPE up to 2051 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
19°
59%
4 AM
19°
24%
5 AM
19°
26%
6 AM
17°
9%
7 AM
17°
7%
8 AM
19°
7%
9 AM
21°
7%
10 AM
22°
7%
11 AM
24°
4%
12 PM
26°
5%
1 PM
28°
5%
2 PM
31°
8%
3 PM
32°
8%
4 PM
33°
17%
5 PM
33°
17%
6 PM
34°
18%
7 PM
33°
21%
8 PM
31°
27%
9 PM
29°
27%
10 PM
26°
32%
11 PM
25°
32%
12 AM
24°
32%
1 AM
24°
33%
2 AM
22°
36%
7-Day Forecast
Today
34° 19°
Clear with a 59% chance of rain.
Thu
38° 19°
Clear with a 36% chance of rain.
Fri
38° 22°
Clear with a 28% chance of rain.
Sat
38° 22°
Mostly Cloudy with a 51% chance of rain.
Sun
38° 21°
Drizzle, 64% chance.
Mon
38° 21°
Rain, 82% chance.
Tue
34° 18°
Drizzle, 53% chance.
TimeTempConditionsPrecipWindHumidity
Now 19° Partly Cloudy 59% 10 mph ENE 92%
4 AM 19° Mostly Clear 24% 6 mph ESE 92%
5 AM 19° Mostly Clear 26% 4 mph ESE 93%
6 AM 17° Mostly Clear 9% 3 mph ESE 94%
7 AM 17° Mostly Clear 7% 4 mph ESE 95%
8 AM 19° Mostly Clear 7% 4 mph E 88%
9 AM 21° Mostly Clear 7% 6 mph ESE 80%
10 AM 22° Clear 7% 7 mph SE 71%
11 AM 24° Clear 4% 6 mph SE 63%
12 PM 26° Clear 5% 7 mph SSE 55%
1 PM 28° Clear 5% 6 mph S 47%
2 PM 31° Clear 8% 7 mph S 44%
3 PM 32° Clear 8% 8 mph S 40%
4 PM 33° Clear 17% 9 mph S 38%
5 PM 33° Mostly Clear 17% 9 mph S 38%
6 PM 34° Mostly Clear 18% 8 mph S 40%
7 PM 33° Partly Cloudy 21% 8 mph S 43%
8 PM 31° Partly Cloudy 27% 7 mph SSE 51%
9 PM 29° Partly Cloudy 27% 7 mph SSE 58%
10 PM 26° Partly Cloudy 32% 7 mph SE 66%
11 PM 25° Partly Cloudy 32% 5 mph SE 70%
12 AM 24° Partly Cloudy 32% 6 mph SSE 74%
1 AM 24° Rain 33% 7 mph SSE 78%
2 AM 22° Rain 36% 5 mph E 80%
15-Day Forecast
Today
9/2
Clear
59%
19°
34°
Thu
9/3
Clear
36%
19°
38°
Fri
9/4
Clear
28%
22°
38°
Sat
9/5
Mostly Cloudy
51%
22°
38°
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%
17°
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, 06:00'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
SBCAPE25 J/kg
MLCAPE795 J/kg
MUCAPE2464 J/kg
SBCIN-456 J/kg
MLCIN-175 J/kg
Lifted Index0.2
Kinematics
0–6 km Shear41 kt
0–1 km Shear23 kt
Eff. Shear29 kt
0–1 km SRH151
0–3 km SRH277
Eff. SRH168
Storm Motion283° @ 30 kt
0–1 km EHI0.0
Composite Parameters
Sig. Tornado0.0
STP (eff)0.1
Supercell6.1
K-Index41.7
Thermo & Levels
PWAT2.13 in
0–3 km LR3.9 °C/km
700–500 LR6.6 °C/km
Total Totals53.3
LCL951 hPa
LFC614 hPa
EL509 hPa
Freezing Lvl13,127 ft