Heat Advisory — Jefferson, IL, Perry, IL, Franklin, IL, Jackson, IL, Williamson, IL, Union, IL, Johnson, IL, Pope, IL, Alexander, IL, Pulaski, IL, Massac, IL, Fulton, KY, Hickman, KY, Carlisle, KY, Ballard, KY, McCracken, KY, Graves, KY, Livingston, KY, Marshall, KY, Calloway, KY, Perry, MO, Bollinger, MO, Cape Girardeau, MO, Wayne, MO, Carter, MO, Ripley, MO, Butler, MO, Stoddard, MO, Scott, MO, Mississippi, MO, New Madrid, MO 7:00 PM

Massac County, Illinois, United States

Last updated: 12:13 PM CDT  ·  Refresh
31°C
Feels like 39°
Partly Cloudy
▲ 36°  /  ▼ 23°
Wind
4 mph SW
Humidity
73%
Dew Point
26°
Pressure
29.53 inHg
Visibility
9 mi
UV Index
8.5
Cloud Cover
54%
Sunrise
5:54 AM
Sunset
8:07 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Massac County is currently partly cloudy at 31°C. Dry conditions are expected through the next 24 hours. Atmospheric instability is elevated (CAPE up to 4408 J/kg) — isolated convective development possible. Sunrise: 5:54AM · Sunset: 8:07PM.

Alerts

Heat Advisory
Jefferson, IL, Perry, IL, Franklin, IL, Jackson, IL, Williamson, IL, Union, IL, Johnson, IL, Pope, IL, Alexander, IL, Pulaski, IL, Massac, IL, Fulton, KY, Hickman, KY, Carlisle, KY, Ballard, KY, McCracken, KY, Graves, KY, Livingston, KY, Marshall, KY, Calloway, KY, Perry, MO, Bollinger, MO, Cape Girardeau, MO, Wayne, MO, Carter, MO, Ripley, MO, Butler, MO, Stoddard, MO, Scott, MO, Mississippi, MO, New Madrid, MO
Expires 7:00 PM
52 AQI · Moderate Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
31°
5%
1 PM
34°
22%
2 PM
34°
28%
3 PM
34°
33%
4 PM
34°
24%
5 PM
35°
24%
6 PM
34°
23%
7 PM
33°
13%
8 PM
32°
30%
9 PM
29°
26%
10 PM
29°
26%
11 PM
28°
30%
12 AM
28°
30%
1 AM
27°
15%
2 AM
26°
15%
3 AM
25°
15%
4 AM
24°
16%
5 AM
23°
16%
6 AM
23°
5%
7 AM
24°
5%
8 AM
26°
23%
9 AM
27°
24%
10 AM
28°
21%
11 AM
30°
24%
7-Day Forecast
Today
36° 23°
Partly Cloudy with a 33% chance of rain.
Mon
36° 23°
Mostly Clear with a 30% chance of rain.
Tue
37° 23°
Mostly Clear with a 56% chance of rain.
Wed
30° 20°
Clear with a 51% chance of rain.
Thu
31° 18°
Clear.
Fri
29° 19°
Drizzle, 60% chance.
Sat
30° 18°
Clear.
TimeTempConditionsPrecipWindHumidity
Now 31° Partly Cloudy 5% 4 mph SW 73%
1 PM 34° Overcast 22% 4 mph SW 66%
2 PM 34° Mostly Cloudy 28% 5 mph SW 65%
3 PM 34° Mostly Cloudy 33% 6 mph WSW 66%
4 PM 34° Partly Cloudy 24% 6 mph SW 66%
5 PM 35° Partly Cloudy 24% 6 mph SW 68%
6 PM 34° Clear 23% 6 mph SW 71%
7 PM 33° Clear 13% 5 mph SSW 76%
8 PM 32° Mostly Clear 30% 5 mph SSW 80%
9 PM 29° Partly Cloudy 26% 5 mph SSW 82%
10 PM 29° Mostly Cloudy 26% 4 mph SSW 84%
11 PM 28° Overcast 30% 2 mph SSE 86%
12 AM 28° Overcast 30% 5 mph ESE 87%
1 AM 27° Mostly Cloudy 15% 7 mph E 88%
2 AM 26° Mostly Cloudy 15% 6 mph ESE 89%
3 AM 25° Mostly Cloudy 15% 5 mph ESE 89%
4 AM 24° Partly Cloudy 16% 4 mph SE 90%
5 AM 23° Partly Cloudy 16% 4 mph SSE 90%
6 AM 23° Partly Cloudy 5% 4 mph S 89%
7 AM 24° Mostly Clear 5% 5 mph SSW 88%
8 AM 26° Mostly Clear 23% 5 mph SSW 84%
9 AM 27° Mostly Clear 24% 6 mph SSW 80%
10 AM 28° Mostly Clear 21% 6 mph SSW 78%
11 AM 30° Mostly Clear 24% 6 mph SSW 76%
15-Day Forecast
Today
7/26
Partly Cloudy
33%
23°
36°
Mon
7/27
Mostly Clear
30%
23°
36°
Tue
7/28
Mostly Clear
56%
23°
37°
Wed
7/29
Clear
51%
20°
30°
Thu
7/30
Clear
19%
18°
31°
Fri
7/31
Drizzle
60%
19°
29°
Sat
8/1
Clear
19%
18°
30°
Sun
8/2
Drizzle
60%
19°
30°
Mon
8/3
Drizzle
60%
20°
31°
Tue
8/4
Drizzle
60%
21°
32°
Wed
8/5
Drizzle
60%
22°
33°
Thu
8/6
Drizzle
60%
21°
32°
Fri
8/7
Drizzle
60%
21°
32°
Sat
8/8
Drizzle
60%
21°
32°
Sun
8/9
Drizzle
60%
21°
32°
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 9.5 µg/m³
O3
Ground-level ozone
40 AQI 44 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Mon 52 Moderate 40 52
Tue 54 Moderate 39 54
Wed 37 Good 37 27
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 Sun Jul 26, 15:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE4927 J/kg
MLCAPE3003 J/kg
MUCAPE4927 J/kg
SBCIN0 J/kg
MLCIN0 J/kg
Lifted Index-7.8
Kinematics
0–6 km Shear21 kt
0–1 km Shear7 kt
Eff. Shear27 kt
0–1 km SRH-18
0–3 km SRH-50
Eff. SRH-50
Storm Motion296° @ 19 kt
0–1 km EHI-0.6
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index31.7
Thermo & Levels
PWAT1.85 in
0–3 km LR6.5 °C/km
700–500 LR5.5 °C/km
Total Totals46.0
LCL931 hPa
LFC1000 hPa
EL125 hPa
Freezing Lvl16,998 ft