Severe Thunderstorm Watch 5:00 AM

Lyon County, Iowa, United States

Last updated: 3:00 AM CDT  ·  Refresh
19°C
Feels like 21°
Mostly Cloudy
▲ 32°  /  ▼ 18°
Wind
8 mph SE
Humidity
96%
Dew Point
19°
Pressure
28.42 inHg
Visibility
10 mi
UV Index
0.0
Cloud Cover
64%
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 60% around 3 AM. Atmospheric instability is elevated (CAPE up to 1943 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°
59%
4 AM
19°
18%
5 AM
19°
20%
6 AM
17°
20%
7 AM
17°
18%
8 AM
17°
21%
9 AM
19°
30%
10 AM
19°
23%
11 AM
22°
23%
12 PM
24°
12%
1 PM
27°
12%
2 PM
29°
20%
3 PM
31°
20%
4 PM
32°
34%
5 PM
31°
29%
6 PM
31°
25%
7 PM
29°
25%
8 PM
28°
26%
9 PM
26°
25%
10 PM
23°
22%
11 PM
23°
35%
12 AM
23°
35%
1 AM
23°
39%
2 AM
21°
39%
7-Day Forecast
Today
32° 18°
Mostly Clear with a 59% chance of rain.
Thu
36° 18°
Mostly Clear with a 47% chance of rain.
Fri
38° 21°
Mostly Clear with a 28% chance of rain.
Sat
36° 19°
Overcast with a 66% chance of rain.
Sun
37° 19°
Rain, 64% chance.
Mon
36° 19°
Rain, 82% chance.
Tue
32° 18°
Drizzle, 53% chance.
TimeTempConditionsPrecipWindHumidity
Now 19° Mostly Cloudy 59% 8 mph SE 96%
4 AM 19° Partly Cloudy 18% 4 mph ESE 96%
5 AM 19° Mostly Clear 20% 4 mph ESE 96%
6 AM 17° Mostly Clear 20% 5 mph ENE 97%
7 AM 17° Partly Cloudy 18% 6 mph NE 97%
8 AM 17° Partly Cloudy 21% 6 mph ENE 94%
9 AM 19° Mostly Clear 30% 6 mph E 89%
10 AM 19° Mostly Clear 23% 6 mph ESE 84%
11 AM 22° Mostly Clear 23% 6 mph ESE 74%
12 PM 24° Clear 12% 7 mph SE 64%
1 PM 27° Clear 12% 7 mph SE 53%
2 PM 29° Clear 20% 7 mph SSE 50%
3 PM 31° Clear 20% 8 mph SSE 46%
4 PM 32° Clear 34% 8 mph S 42%
5 PM 31° Mostly Clear 29% 7 mph SSE 47%
6 PM 31° Mostly Clear 25% 7 mph SE 53%
7 PM 29° Partly Cloudy 25% 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% 6 mph ESE 83%
11 PM 23° Mostly Clear 35% 5 mph ESE 82%
12 AM 23° Partly Cloudy 35% 5 mph SE 82%
1 AM 23° Rain 39% 5 mph SSE 81%
2 AM 21° Rain 39% 5 mph SSE 84%
15-Day Forecast
Today
9/2
Mostly Clear
59%
18°
32°
Thu
9/3
Mostly Clear
47%
18°
36°
Fri
9/4
Mostly Clear
28%
21°
38°
Sat
9/5
Overcast
66%
19°
36°
Sun
9/6
Rain
64%
19°
37°
Mon
9/7
Rain
82%
19°
36°
Tue
9/8
Drizzle
53%
18°
32°
Wed
9/9
Drizzle
53%
12°
28°
Thu
9/10
Drizzle
44%
14°
28°
Fri
9/11
Rain
68%
13°
31°
Sat
9/12
Drizzle
60%
16°
29°
Sun
9/13
Drizzle
60%
14°
28°
Mon
9/14
Clear
60%
14°
28°
Tue
9/15
Drizzle
60%
15°
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 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
SBCAPE20 J/kg
MLCAPE646 J/kg
MUCAPE1300 J/kg
SBCIN-490 J/kg
MLCIN-223 J/kg
Lifted Index-0.3
Kinematics
0–6 km Shear39 kt
0–1 km Shear9 kt
Eff. Shear36 kt
0–1 km SRH64
0–3 km SRH202
Eff. SRH175
Storm Motion290° @ 28 kt
0–1 km EHI0.0
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell4.3
K-Index37.8
Thermo & Levels
PWAT1.89 in
0–3 km LR3.8 °C/km
700–500 LR6.9 °C/km
Total Totals52.2
LCL945 hPa
LFC580 hPa
EL462 hPa
Freezing Lvl13,399 ft