Severe Thunderstorm Watch 12:00 AM Severe Thunderstorm Watch 12:00 AM Flash Flood Warning — Marshall County, IL 11:45 PM

Marshall County, Illinois, United States

Last updated: 10:25 PM CDT  ·  Refresh
22°C
Feels like 24°
Heavy Rain
▲ 28°  /  ▼ 15°
Wind
6 mph E
Humidity
92%
Dew Point
20°
Pressure
29.25 inHg
Visibility
10 mi
UV Index
0.0
Cloud Cover
69%
Sunrise
6:13 AM
Sunset
7:46 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Marshall County is currently heavy rain at 22°C. Precipitation is likely — peak probability 60% around 10 PM. Atmospheric instability is elevated (CAPE up to 1560 J/kg) — isolated convective development possible. Sunrise: 6:13AM · Sunset: 7:46PM.

Alerts

Severe Thunderstorm Watch
Expires 12:00 AM
Severe Thunderstorm Watch
Expires 12:00 AM
Flash Flood Warning
Marshall County, IL
Expires 11:45 PM
34 AQI · Good Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
22°
59%
11 PM
21°
54%
12 AM
21°
52%
1 AM
20°
5%
2 AM
19°
5%
3 AM
18°
6%
4 AM
18°
6%
5 AM
17°
6%
6 AM
16°
3%
7 AM
17°
3%
8 AM
18°
5%
9 AM
21°
8%
10 AM
22°
17%
11 AM
23°
17%
12 PM
25°
17%
1 PM
27°
16%
2 PM
27°
16%
3 PM
27°
20%
4 PM
27°
20%
5 PM
27°
5%
6 PM
26°
5%
7 PM
25°
3%
8 PM
24°
3%
9 PM
22°
3%
7-Day Forecast
Tonight
28° 15°
Heavy Rain, 59% chance.
Sat
27° 14°
Mostly Clear with a 20% chance of rain.
Sun
24° 12°
Mostly Clear.
Mon
23° 14°
Overcast with a 44% chance of rain.
Tue
25° 13°
Rain, 64% chance.
Wed
27° 16°
Thunderstorm, 64% chance.
Thu
27° 17°
Drizzle, 43% chance.
TimeTempConditionsPrecipWindHumidity
Now 22° Heavy Rain 59% 6 mph E 92%
11 PM 21° Partly Cloudy 54% 5 mph WNW 95%
12 AM 21° Partly Cloudy 52% 5 mph W 95%
1 AM 20° Clear 5% 6 mph W 96%
2 AM 19° Clear 5% 6 mph W 95%
3 AM 18° Clear 6% 7 mph WNW 94%
4 AM 18° Clear 6% 7 mph NW 94%
5 AM 17° Clear 6% 7 mph NW 93%
6 AM 16° Clear 3% 7 mph NW 93%
7 AM 17° Clear 3% 7 mph NW 91%
8 AM 18° Clear 5% 8 mph NW 86%
9 AM 21° Clear 8% 8 mph NW 80%
10 AM 22° Clear 17% 8 mph NW 75%
11 AM 23° Clear 17% 9 mph NW 70%
12 PM 25° Clear 17% 11 mph WNW 66%
1 PM 27° Mostly Clear 16% 12 mph WNW 64%
2 PM 27° Mostly Clear 16% 12 mph WNW 64%
3 PM 27° Partly Cloudy 20% 12 mph WNW 65%
4 PM 27° Partly Cloudy 20% 12 mph WNW 66%
5 PM 27° Partly Cloudy 5% 10 mph NW 69%
6 PM 26° Mostly Clear 5% 10 mph NW 73%
7 PM 25° Mostly Clear 3% 9 mph WNW 73%
8 PM 24° Mostly Clear 3% 9 mph WNW 75%
9 PM 22° Mostly Clear 3% 8 mph WNW 77%
15-Day Forecast
Today
8/21
Heavy Rain
59%
15°
28°
Sat
8/22
Mostly Clear
20%
14°
27°
Sun
8/23
Mostly Clear
3%
12°
24°
Mon
8/24
Overcast
44%
14°
23°
Tue
8/25
Rain
64%
13°
25°
Wed
8/26
Thunderstorm
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
Drizzle
68%
19°
29°
Mon
8/31
Drizzle
60%
20°
32°
Tue
9/1
Drizzle
60%
19°
31°
Wed
9/2
Drizzle
60%
18°
28°
Thu
9/3
Drizzle
60%
17°
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 Sat Aug 22, 02:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE1234 J/kg
MLCAPE2101 J/kg
MUCAPE2769 J/kg
SBCIN-134 J/kg
MLCIN-35 J/kg
Lifted Index-4.1
Kinematics
0–6 km Shear28 kt
0–1 km Shear22 kt
Eff. Shear29 kt
0–1 km SRH169
0–3 km SRH190
Eff. SRH190
Storm Motion329° @ 22 kt
0–1 km EHI1.3
Composite Parameters
Sig. Tornado0.7
STP (eff)1.3
Supercell7.7
K-Index37.1
Thermo & Levels
PWAT1.83 in
0–3 km LR5.6 °C/km
700–500 LR6.1 °C/km
Total Totals52.3
LCL963 hPa
LFC787 hPa
EL217 hPa
Freezing Lvl12,323 ft