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: 11:19 PM CDT  ·  Refresh
21°C
Feels like 23°
Rain
▲ 28°  /  ▼ 15°
Wind
5 mph N
Humidity
94%
Dew Point
20°
Pressure
29.25 inHg
Visibility
10 mi
UV Index
0.0
Cloud Cover
65%
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 rain at 21°C. Precipitation is likely — peak probability 55% around 11 PM. Atmospheric instability is elevated (CAPE up to 1567 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
21°
54%
12 AM
21°
35%
1 AM
20°
4%
2 AM
19°
5%
3 AM
19°
5%
4 AM
18°
6%
5 AM
17°
6%
6 AM
16°
3%
7 AM
16°
3%
8 AM
18°
5%
9 AM
21°
8%
10 AM
22°
17%
11 AM
23°
17%
12 PM
25°
17%
1 PM
27°
17%
2 PM
27°
16%
3 PM
27°
20%
4 PM
27°
20%
5 PM
28°
5%
6 PM
26°
5%
7 PM
25°
3%
8 PM
24°
3%
9 PM
22°
3%
10 PM
21°
3%
7-Day Forecast
Tonight
28° 15°
Rain, 54% chance.
Sat
28° 14°
Mostly Clear.
Sun
25° 12°
Mostly Clear.
Mon
23° 14°
Mostly Cloudy with a 44% chance of rain.
Tue
24° 13°
Rain, 64% chance.
Wed
27° 16°
Thunderstorm, 64% chance.
Thu
27° 17°
Drizzle, 43% chance.
TimeTempConditionsPrecipWindHumidity
Now 21° Rain 54% 5 mph N 94%
12 AM 21° Partly Cloudy 35% 6 mph WSW 95%
1 AM 20° Mostly Clear 4% 5 mph W 96%
2 AM 19° Clear 5% 6 mph W 95%
3 AM 19° Clear 5% 7 mph WNW 94%
4 AM 18° Clear 6% 7 mph NW 93%
5 AM 17° Clear 6% 7 mph NW 93%
6 AM 16° Clear 3% 7 mph NW 93%
7 AM 16° Clear 3% 7 mph NW 91%
8 AM 18° Clear 5% 8 mph NW 86%
9 AM 21° Clear 8% 8 mph NW 81%
10 AM 22° Clear 17% 8 mph NW 75%
11 AM 23° Clear 17% 9 mph NW 71%
12 PM 25° Clear 17% 10 mph NW 66%
1 PM 27° Clear 17% 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 NW 66%
5 PM 28° Mostly Clear 5% 11 mph NW 69%
6 PM 26° Mostly Clear 5% 10 mph NW 72%
7 PM 25° Mostly Clear 3% 9 mph NW 73%
8 PM 24° Mostly Clear 3% 9 mph NW 75%
9 PM 22° Clear 3% 8 mph NW 77%
10 PM 21° Clear 3% 8 mph NW 78%
15-Day Forecast
Today
8/21
Rain
54%
15°
28°
Sat
8/22
Mostly Clear
17%
14°
28°
Sun
8/23
Mostly Clear
3%
12°
25°
Mon
8/24
Mostly Cloudy
44%
14°
23°
Tue
8/25
Rain
64%
13°
24°
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%
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°
27°
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, 03:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE915 J/kg
MLCAPE1669 J/kg
MUCAPE2052 J/kg
SBCIN-81 J/kg
MLCIN-18 J/kg
Lifted Index-3.5
Kinematics
0–6 km Shear27 kt
0–1 km Shear16 kt
Eff. Shear27 kt
0–1 km SRH85
0–3 km SRH87
Eff. SRH87
Storm Motion334° @ 24 kt
0–1 km EHI0.5
Composite Parameters
Sig. Tornado0.2
STP (eff)0.5
Supercell2.5
K-Index38.3
Thermo & Levels
PWAT1.82 in
0–3 km LR5.2 °C/km
700–500 LR6.4 °C/km
Total Totals51.9
LCL969 hPa
LFC783 hPa
EL229 hPa
Freezing Lvl12,766 ft