Severe Thunderstorm Watch 10:00 PM

Stephenson County, Illinois, United States

Last updated: 9:10 PM CDT  ·  Refresh
20°C
Feels like 21°
Partly Cloudy
▲ 27°  /  ▼ 14°
Wind
6 mph W
Humidity
93%
Dew Point
19°
Pressure
29.07 inHg
Visibility
10 mi
UV Index
0.0
Cloud Cover
36%
Sunrise
6:12 AM
Sunset
7:50 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Stephenson County is currently partly cloudy at 20°C. Dry conditions are expected through the next 24 hours. Atmospheric instability is elevated (CAPE up to 1117 J/kg) — isolated convective development possible. Sunrise: 6:12AM · Sunset: 7:50PM.

Alerts

Severe Thunderstorm Watch
Expires 10:00 PM
33 AQI · Good Dominant: O3 Air Quality
Hourly Forecast · Next 24 Hours
Now
20°
37%
10 PM
19°
17%
11 PM
18°
18%
12 AM
18°
14%
1 AM
17°
3%
2 AM
17°
3%
3 AM
16°
3%
4 AM
16°
4%
5 AM
14°
4%
6 AM
14°
5%
7 AM
14°
5%
8 AM
17°
5%
9 AM
19°
5%
10 AM
22°
5%
11 AM
23°
5%
12 PM
24°
15%
1 PM
26°
16%
2 PM
26°
5%
3 PM
26°
5%
4 PM
27°
5%
5 PM
26°
5%
6 PM
25°
3%
7 PM
24°
3%
8 PM
22°
3%
7-Day Forecast
Tonight
27° 14°
Partly Cloudy with a 37% chance of rain.
Sat
27° 14°
Clear.
Sun
24° 11°
Partly Cloudy.
Mon
22° 10°
Mostly Cloudy with a 44% chance of rain.
Tue
24° 12°
Drizzle, 64% chance.
Wed
28° 16°
Rain, 64% chance.
Thu
26° 16°
Clear.
TimeTempConditionsPrecipWindHumidity
Now 20° Partly Cloudy 37% 6 mph W 93%
10 PM 19° Clear 17% 4 mph W 93%
11 PM 18° Mostly Clear 18% 4 mph NW 92%
12 AM 18° Mostly Clear 14% 6 mph NW 91%
1 AM 17° Mostly Clear 3% 6 mph NW 91%
2 AM 17° Mostly Clear 3% 7 mph NW 91%
3 AM 16° Mostly Clear 3% 7 mph NW 92%
4 AM 16° Mostly Clear 4% 7 mph NW 92%
5 AM 14° Mostly Clear 4% 6 mph NW 92%
6 AM 14° Mostly Clear 5% 5 mph NW 92%
7 AM 14° Mostly Clear 5% 5 mph NW 92%
8 AM 17° Mostly Clear 5% 7 mph NW 86%
9 AM 19° Mostly Clear 5% 8 mph NW 81%
10 AM 22° Clear 5% 9 mph NW 75%
11 AM 23° Clear 5% 11 mph NW 69%
12 PM 24° Clear 15% 14 mph NW 62%
1 PM 26° Clear 16% 15 mph NW 57%
2 PM 26° Clear 5% 15 mph NW 55%
3 PM 26° Clear 5% 14 mph NW 54%
4 PM 27° Clear 5% 14 mph NW 54%
5 PM 26° Clear 5% 12 mph NW 59%
6 PM 25° Clear 3% 11 mph NW 64%
7 PM 24° Clear 3% 10 mph NW 66%
8 PM 22° Clear 3% 9 mph NW 67%
15-Day Forecast
Today
8/21
Partly Cloudy
37%
14°
27°
Sat
8/22
Clear
15%
14°
27°
Sun
8/23
Partly Cloudy
3%
11°
24°
Mon
8/24
Mostly Cloudy
44%
10°
22°
Tue
8/25
Drizzle
64%
12°
24°
Wed
8/26
Rain
64%
16°
28°
Thu
8/27
Clear
17%
16°
26°
Fri
8/28
Clear
17%
16°
27°
Sat
8/29
Drizzle
68%
15°
27°
Sun
8/30
Rain
68%
18°
28°
Mon
8/31
Drizzle
60%
17°
29°
Tue
9/1
Drizzle
60%
18°
29°
Wed
9/2
Drizzle
60%
17°
27°
Thu
9/3
Drizzle
60%
16°
26°
Fri
9/4
Drizzle
60%
16°
27°
33
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
29 AQI 5.3 µg/m³
O3
Ground-level ozone
Dominant
33 AQI 37 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Today 33 Good 33 29
Sun 27 Good 27 19
Mon 24 Good 24 11
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 Aug 21, 23:00'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
SBCAPE823 J/kg
MLCAPE1853 J/kg
MUCAPE2517 J/kg
SBCIN-184 J/kg
MLCIN-62 J/kg
Lifted Index-2.2
Kinematics
0–6 km Shear26 kt
0–1 km Shear17 kt
Eff. Shear25 kt
0–1 km SRH61
0–3 km SRH53
Eff. SRH53
Storm Motion340° @ 21 kt
0–1 km EHI0.3
Composite Parameters
Sig. Tornado0.2
STP (eff)0.3
Supercell1.7
K-Index34.6
Thermo & Levels
PWAT1.47 in
0–3 km LR5.2 °C/km
700–500 LR5.8 °C/km
Total Totals49.6
LCL976 hPa
LFC791 hPa
EL243 hPa
Freezing Lvl12,818 ft