Heat Advisory — Marion, AL, Lamar, AL, Fayette, AL, Walker, AL, Jefferson, AL, Shelby, AL 9:00 PM

St. Clair County, Alabama, United States

Last updated: 1:02 AM CDT  ·  Refresh
26°C
Feels like 29°
Mostly Cloudy
▲ 34°  /  ▼ 20°
Wind
6 mph WNW
Humidity
86%
Dew Point
23°
Pressure
29.25 inHg
Visibility
10 mi
UV Index
0.0
Cloud Cover
70%
Sunrise
6:11 AM
Sunset
7:24 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: St. Clair County is currently mostly cloudy at 26°C. Precipitation is likely — peak probability 60% around 2 AM. Atmospheric instability is elevated (CAPE up to 2290 J/kg) — isolated convective development possible. Sunrise: 6:11AM · Sunset: 7:24PM.

Alerts

Heat Advisory
Marion, AL, Lamar, AL, Fayette, AL, Walker, AL, Jefferson, AL, Shelby, AL
Expires 9:00 PM
56 AQI · Moderate Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
26°
57%
2 AM
24°
60%
3 AM
24°
35%
4 AM
23°
9%
5 AM
22°
10%
6 AM
21°
11%
7 AM
21°
8%
8 AM
23°
15%
9 AM
26°
16%
10 AM
28°
31%
11 AM
29°
35%
12 PM
30°
36%
1 PM
32°
32%
2 PM
32°
37%
3 PM
32°
37%
4 PM
32°
28%
5 PM
34°
28%
6 PM
33°
24%
7 PM
33°
14%
8 PM
31°
14%
9 PM
28°
16%
10 PM
26°
15%
11 PM
24°
6%
12 AM
23°
6%
7-Day Forecast
Today
34° 20°
Mostly Clear with a 57% chance of rain.
Sat
34° 20°
Clear.
Sun
34° 19°
Clear with a 51% chance of rain.
Mon
29° 19°
Rain, 75% chance.
Tue
32° 19°
Rain, 90% chance.
Wed
35° 22°
Heavy Rain, 90% chance.
Thu
31° 19°
Rain, 82% chance.
TimeTempConditionsPrecipWindHumidity
Now 26° Mostly Cloudy 57% 6 mph WNW 86%
2 AM 24° Overcast 60% 5 mph WNW 90%
3 AM 24° Overcast 35% 4 mph NW 92%
4 AM 23° Overcast 9% 3 mph NW 95%
5 AM 22° Mostly Cloudy 10% 2 mph NW 94%
6 AM 21° Mostly Cloudy 11% 2 mph WNW 94%
7 AM 21° Mostly Clear 8% 1 mph W 94%
8 AM 23° Mostly Clear 15% 2 mph WNW 87%
9 AM 26° Mostly Clear 16% 2 mph W 80%
10 AM 28° Clear 31% 2 mph SW 72%
11 AM 29° Clear 35% 3 mph SW 67%
12 PM 30° Mostly Clear 36% 4 mph WSW 63%
1 PM 32° Mostly Clear 32% 4 mph SW 58%
2 PM 32° Mostly Clear 37% 4 mph WNW 58%
3 PM 32° Mostly Clear 37% 5 mph WNW 59%
4 PM 32° Mostly Clear 28% 6 mph WNW 58%
5 PM 34° Mostly Clear 28% 5 mph NW 62%
6 PM 33° Mostly Clear 24% 5 mph NW 65%
7 PM 33° Mostly Clear 14% 5 mph NW 69%
8 PM 31° Mostly Clear 14% 4 mph NW 71%
9 PM 28° Clear 16% 4 mph NW 73%
10 PM 26° Clear 15% 4 mph NW 75%
11 PM 24° Clear 6% 3 mph NNW 78%
12 AM 23° Clear 6% 3 mph N 80%
15-Day Forecast
Today
8/21
Mostly Clear
57%
20°
34°
Sat
8/22
Clear
6%
20°
34°
Sun
8/23
Clear
51%
19°
34°
Mon
8/24
Rain
75%
19°
29°
Tue
8/25
Rain
90%
19°
32°
Wed
8/26
Heavy Rain
90%
22°
35°
Thu
8/27
Rain
82%
19°
31°
Fri
8/28
Drizzle
43%
19°
34°
Sat
8/29
Drizzle
44%
20°
36°
Sun
8/30
Drizzle
60%
21°
34°
Mon
8/31
Drizzle
60%
22°
34°
Tue
9/1
Drizzle
60%
21°
33°
Wed
9/2
Drizzle
60%
21°
33°
Thu
9/3
Drizzle
60%
21°
33°
Fri
9/4
Drizzle
60%
20°
33°
56
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
56 AQI 12.0 µg/m³
O3
Ground-level ozone
42 AQI 45 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Today 56 Moderate 42 56
Sat 45 Good 38 45
Sun 52 Moderate 35 52
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, 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
SBCAPE1806 J/kg
MLCAPE2306 J/kg
MUCAPE2675 J/kg
SBCIN-155 J/kg
MLCIN-68 J/kg
Lifted Index-5.5
Kinematics
0–6 km Shear11 kt
0–1 km Shear12 kt
Eff. Shear11 kt
0–1 km SRH42
0–3 km SRH26
Eff. SRH26
Storm Motion295° @ 19 kt
0–1 km EHI0.5
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index35.2
Thermo & Levels
PWAT2.12 in
0–3 km LR5.3 °C/km
700–500 LR6.3 °C/km
Total Totals52.2
LCL955 hPa
LFC795 hPa
EL169 hPa
Freezing Lvl14,334 ft