Severe Thunderstorm Watch 5:00 AM

Lyon County, Iowa, United States

Last updated: 2:01 AM CDT  ·  Refresh
19°C
Feels like 20°
Mostly Cloudy
▲ 32°  /  ▼ 18°
Wind
8 mph E
Humidity
96%
Dew Point
18°
Pressure
28.43 inHg
Visibility
10 mi
UV Index
0.0
Cloud Cover
69%
Sunrise
6:50 AM
Sunset
7:57 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Lyon County is currently mostly cloudy at 20°C. Precipitation is likely — peak probability 55% around 2 AM. Atmospheric instability is elevated (CAPE up to 1910 J/kg) — isolated convective development possible. Sunrise: 6:50AM · Sunset: 7:57PM.

Alerts

Severe Thunderstorm Watch
Expires 5:00 AM
52 AQI · Moderate Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
19°
54%
3 AM
19°
44%
4 AM
19°
20%
5 AM
18°
22%
6 AM
17°
21%
7 AM
16°
15%
8 AM
17°
15%
9 AM
19°
16%
10 AM
19°
9%
11 AM
22°
18%
12 PM
24°
18%
1 PM
27°
7%
2 PM
29°
17%
3 PM
31°
20%
4 PM
32°
34%
5 PM
31°
29%
6 PM
31°
25%
7 PM
29°
26%
8 PM
28°
26%
9 PM
26°
25%
10 PM
23°
22%
11 PM
23°
35%
12 AM
23°
35%
1 AM
21°
44%
7-Day Forecast
Today
32° 18°
Mostly Clear with a 54% chance of rain.
Thu
36° 18°
Mostly Clear with a 39% chance of rain.
Fri
38° 21°
Mostly Clear with a 28% chance of rain.
Sat
37° 19°
Overcast with a 66% chance of rain.
Sun
37° 19°
Rain, 69% chance.
Mon
36° 19°
Heavy Rain, 82% chance.
Tue
32° 17°
Clear with a 53% chance of rain.
TimeTempConditionsPrecipWindHumidity
Now 19° Mostly Cloudy 54% 8 mph E 96%
3 AM 19° Mostly Cloudy 44% 6 mph ESE 95%
4 AM 19° Mostly Clear 20% 6 mph E 96%
5 AM 18° Mostly Clear 22% 5 mph E 96%
6 AM 17° Mostly Clear 21% 5 mph ENE 97%
7 AM 16° Partly Cloudy 15% 6 mph ENE 97%
8 AM 17° Partly Cloudy 15% 6 mph ENE 93%
9 AM 19° Mostly Clear 16% 7 mph E 89%
10 AM 19° Mostly Clear 9% 8 mph E 85%
11 AM 22° Mostly Clear 18% 7 mph ESE 75%
12 PM 24° Clear 18% 7 mph SE 65%
1 PM 27° Clear 7% 7 mph SE 54%
2 PM 29° Clear 17% 7 mph SSE 50%
3 PM 31° Clear 20% 8 mph SSE 46%
4 PM 32° Clear 34% 8 mph SSE 43%
5 PM 31° Mostly Clear 29% 7 mph SSE 48%
6 PM 31° Mostly Clear 25% 7 mph SE 53%
7 PM 29° Partly Cloudy 26% 8 mph ESE 60%
8 PM 28° Mostly Clear 26% 7 mph ESE 68%
9 PM 26° Mostly Clear 25% 7 mph ESE 76%
10 PM 23° Mostly Clear 22% 7 mph ESE 82%
11 PM 23° Mostly Clear 35% 5 mph ESE 82%
12 AM 23° Partly Cloudy 35% 5 mph SE 81%
1 AM 21° Rain 44% 5 mph SSE 81%
15-Day Forecast
Today
9/2
Mostly Clear
54%
18°
32°
Thu
9/3
Mostly Clear
39%
18°
36°
Fri
9/4
Mostly Clear
28%
21°
38°
Sat
9/5
Overcast
66%
19°
37°
Sun
9/6
Rain
69%
19°
37°
Mon
9/7
Heavy Rain
82%
19°
36°
Tue
9/8
Clear
53%
17°
32°
Wed
9/9
Drizzle
53%
12°
28°
Thu
9/10
Clear
44%
14°
29°
Fri
9/11
Rain
64%
13°
31°
Sat
9/12
Clear
60%
16°
30°
Sun
9/13
Drizzle
60%
15°
29°
Mon
9/14
Drizzle
60%
15°
27°
Tue
9/15
Drizzle
60%
14°
28°
Wed
9/16
Clear
60%
14°
28°
52
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
52 AQI 9.7 µg/m³
O3
Ground-level ozone
36 AQI 39 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Today 52 Moderate 36 52
Thu 40 Good 40 34
Fri 47 Good 47 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 LCL0°C Temperature (°C) Pressure (hPa)
Temp Dewpoint Parcel (SB) CAPE CIN Dry adiabat Moist adiabat Mixing ratio
RAP
Valid Wed Sep 2, 05:00'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
SBCAPE0 J/kg
MLCAPE297 J/kg
MUCAPE1585 J/kg
SBCIN—
MLCIN-145 J/kg
Lifted Index0.7
Kinematics
0–6 km Shear46 kt
0–1 km Shear6 kt
Eff. Shear50 kt
0–1 km SRH52
0–3 km SRH225
Eff. SRH249
Storm Motion285° @ 27 kt
0–1 km EHI0.0
Composite Parameters
Sig. Tornado0.0
STP (eff)0.2
Supercell10.2
K-Index41.8
Thermo & Levels
PWAT2.12 in
0–3 km LR4.0 °C/km
700–500 LR6.3 °C/km
Total Totals51.1
LCL947 hPa
LFC—
EL—
Freezing Lvl13,530 ft