Severe Thunderstorm Watch 10:00 PM Severe Thunderstorm Watch 10:00 PM Flash Flood Warning — Marshall County, IL 11:45 PM

Marshall County, Illinois, United States

Last updated: 9:12 PM CDT  ·  Refresh
23°C
Feels like 25°
Mostly Cloudy
▲ 28°  /  ▼ 15°
Wind
7 mph WSW
Humidity
91%
Dew Point
21°
Pressure
29.24 inHg
Visibility
7 mi
UV Index
0.0
Cloud Cover
82%
Sunrise
6:13 AM
Sunset
7:46 PM
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WeatherAI™ Analysis

WeatherAI Analysis: Marshall County is currently mostly cloudy at 23°C. Precipitation is likely — peak probability 71% around 9 PM. Atmospheric instability is elevated (CAPE up to 1532 J/kg) — isolated convective development possible. Sunrise: 6:13AM · Sunset: 7:46PM.

Alerts

Severe Thunderstorm Watch
Expires 10:00 PM
Severe Thunderstorm Watch
Expires 10:00 PM
Flash Flood Warning
Marshall County, IL
Expires 11:45 PM
34 AQI · Good Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
23°
70%
10 PM
22°
60%
11 PM
21°
59%
12 AM
20°
33%
1 AM
19°
3%
2 AM
18°
3%
3 AM
18°
3%
4 AM
18°
3%
5 AM
17°
3%
6 AM
17°
3%
7 AM
16°
3%
8 AM
18°
5%
9 AM
20°
8%
10 AM
21°
17%
11 AM
23°
17%
12 PM
24°
18%
1 PM
27°
9%
2 PM
27°
20%
3 PM
27°
16%
4 PM
28°
20%
5 PM
27°
5%
6 PM
26°
5%
7 PM
25°
3%
8 PM
23°
3%
7-Day Forecast
Tonight
28° 15°
Mostly Cloudy with a 70% chance of rain.
Sat
28° 15°
Mostly Clear with a 33% chance of rain.
Sun
25° 13°
Mostly Clear.
Mon
23° 13°
Overcast with a 37% chance of rain.
Tue
24° 13°
Clear with a 64% chance of rain.
Wed
27° 16°
Rain, 64% chance.
Thu
27° 17°
Drizzle, 43% chance.
TimeTempConditionsPrecipWindHumidity
Now 23° Mostly Cloudy 70% 7 mph WSW 91%
10 PM 22° Rain 60% 8 mph NW 92%
11 PM 21° Mostly Cloudy 59% 6 mph W 94%
12 AM 20° Partly Cloudy 33% 5 mph WSW 94%
1 AM 19° Mostly Clear 3% 6 mph W 94%
2 AM 18° Mostly Clear 3% 7 mph W 95%
3 AM 18° Mostly Clear 3% 7 mph WNW 95%
4 AM 18° Partly Cloudy 3% 7 mph WNW 94%
5 AM 17° Partly Cloudy 3% 7 mph NW 94%
6 AM 17° Partly Cloudy 3% 7 mph NW 94%
7 AM 16° Partly Cloudy 3% 7 mph NW 93%
8 AM 18° Partly Cloudy 5% 8 mph NW 89%
9 AM 20° Fog 8% 8 mph NW 86%
10 AM 21° Haze 17% 8 mph NW 81%
11 AM 23° Mostly Clear 17% 10 mph NW 74%
12 PM 24° Mostly Clear 18% 11 mph NW 68%
1 PM 27° Mostly Clear 9% 12 mph NW 63%
2 PM 27° Mostly Clear 20% 12 mph NW 63%
3 PM 27° Mostly Clear 16% 12 mph NW 63%
4 PM 28° Mostly Clear 20% 12 mph NW 64%
5 PM 27° Mostly Clear 5% 11 mph NW 68%
6 PM 26° Clear 5% 10 mph NW 72%
7 PM 25° Clear 3% 9 mph NW 72%
8 PM 23° Clear 3% 8 mph NW 74%
15-Day Forecast
Today
8/21
Mostly Cloudy
70%
15°
28°
Sat
8/22
Mostly Clear
33%
15°
28°
Sun
8/23
Mostly Clear
3%
13°
25°
Mon
8/24
Overcast
37%
13°
23°
Tue
8/25
Clear
64%
13°
24°
Wed
8/26
Rain
64%
16°
27°
Thu
8/27
Drizzle
43%
17°
27°
Fri
8/28
Clear
17%
17°
26°
Sat
8/29
Thunderstorm
68%
16°
28°
Sun
8/30
Rain
68%
19°
29°
Mon
8/31
Drizzle
60%
19°
32°
Tue
9/1
Drizzle
60%
19°
31°
Wed
9/2
Drizzle
60%
18°
28°
Thu
9/3
Drizzle
60%
18°
27°
Fri
9/4
Drizzle
60%
17°
28°
34
Good
U.S. Air Quality Index · Dominant: PM2.5
50 100 150 200

Air quality is satisfactory and poses little or no health risk.

Pollutant Breakdown · Today
PM2.5
Fine particulate matter
Dominant
34 AQI 6.1 µg/m³
O3
Ground-level ozone
32 AQI 36 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Today 34 Good 32 34
Sun 28 Good 28 24
Mon 25 Good 25 9
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
SBCAPE1968 J/kg
MLCAPE2234 J/kg
MUCAPE2627 J/kg
SBCIN-103 J/kg
MLCIN-33 J/kg
Lifted Index-5.8
Kinematics
0–6 km Shear28 kt
0–1 km Shear17 kt
Eff. Shear28 kt
0–1 km SRH127
0–3 km SRH155
Eff. SRH155
Storm Motion337° @ 21 kt
0–1 km EHI1.6
Composite Parameters
Sig. Tornado0.8
STP (eff)1.1
Supercell5.9
K-Index32.3
Thermo & Levels
PWAT1.57 in
0–3 km LR5.7 °C/km
700–500 LR6.3 °C/km
Total Totals52.8
LCL966 hPa
LFC853 hPa
EL212 hPa
Freezing Lvl12,831 ft