Extreme Heat Warning — Columbia, AR, Union, AR, Caddo, LA, Bossier, LA, Webster, LA, Claiborne, LA, Lincoln, LA, Union, LA, De Soto, LA, Red River, LA, Bienville, LA, Jackson, LA, Ouachita, LA, Sabine, LA, Natchitoches, LA, Winn, LA, Grant, LA, Caldwell, LA, La Salle, LA, Wood, TX, Upshur, TX, Marion, TX, Smith, TX, Gregg, TX, Harrison, TX, Cherokee, TX, Rusk, TX, Panola, TX, Nacogdoches, TX, Shelby, TX, Angelina, TX, San Augustine, TX, Sabine, TX 9:00 PM Heat Advisory — Columbia, AR, Union, AR, Caddo, LA, Bossier, LA, Webster, LA, Claiborne, LA, Lincoln, LA, Union, LA, De Soto, LA, Red River, LA, Bienville, LA, Jackson, LA, Ouachita, LA, Sabine, LA, Natchitoches, LA, Winn, LA, Grant, LA, Caldwell, LA, La Salle, LA, Wood, TX, Upshur, TX, Marion, TX, Smith, TX, Gregg, TX, Harrison, TX, Cherokee, TX, Rusk, TX, Panola, TX, Nacogdoches, TX, Shelby, TX, Angelina, TX, San Augustine, TX, Sabine, TX 8:00 PM

Union County, Arkansas, United States

Last updated: 5:05 PM CDT  ·  Refresh
38°C
Feels like 41°
Mostly Clear
▲ 38°  /  ▼ 22°
Wind
7 mph N
Humidity
35%
Dew Point
19°
Pressure
29.70 inHg
Visibility
10 mi
UV Index
6.4
Cloud Cover
28%
Sunrise
6:37 AM
Sunset
7:49 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Union County is currently mostly clear at 38°C. Dry conditions are expected through the next 24 hours. Atmospheric instability is elevated (CAPE up to 1800 J/kg) — isolated convective development possible. Sunrise: 6:37AM · Sunset: 7:49PM.

Alerts

Extreme Heat Warning
Columbia, AR, Union, AR, Caddo, LA, Bossier, LA, Webster, LA, Claiborne, LA, Lincoln, LA, Union, LA, De Soto, LA, Red River, LA, Bienville, LA, Jackson, LA, Ouachita, LA, Sabine, LA, Natchitoches, LA, Winn, LA, Grant, LA, Caldwell, LA, La Salle, LA, Wood, TX, Upshur, TX, Marion, TX, Smith, TX, Gregg, TX, Harrison, TX, Cherokee, TX, Rusk, TX, Panola, TX, Nacogdoches, TX, Shelby, TX, Angelina, TX, San Augustine, TX, Sabine, TX
Expires 9:00 PM
Heat Advisory
Columbia, AR, Union, AR, Caddo, LA, Bossier, LA, Webster, LA, Claiborne, LA, Lincoln, LA, Union, LA, De Soto, LA, Red River, LA, Bienville, LA, Jackson, LA, Ouachita, LA, Sabine, LA, Natchitoches, LA, Winn, LA, Grant, LA, Caldwell, LA, La Salle, LA, Wood, TX, Upshur, TX, Marion, TX, Smith, TX, Gregg, TX, Harrison, TX, Cherokee, TX, Rusk, TX, Panola, TX, Nacogdoches, TX, Shelby, TX, Angelina, TX, San Augustine, TX, Sabine, TX
Expires 8:00 PM
58 AQI · Moderate Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
38°
9%
6 PM
38°
22%
7 PM
37°
22%
8 PM
34°
22%
9 PM
33°
20%
10 PM
29°
10%
11 PM
28°
10%
12 AM
27°
10%
1 AM
27°
3%
2 AM
26°
3%
3 AM
25°
7%
4 AM
24°
7%
5 AM
24°
7%
6 AM
22°
8%
7 AM
22°
16%
8 AM
24°
16%
9 AM
27°
16%
10 AM
30°
17%
11 AM
31°
17%
12 PM
34°
17%
1 PM
36°
20%
2 PM
37°
31%
3 PM
37°
35%
4 PM
38°
28%
7-Day Forecast
Today
38° 22°
Mostly Clear with a 22% chance of rain.
Sat
41° 22°
Mostly Clear with a 37% chance of rain.
Sun
40° 21°
Partly Cloudy with a 37% chance of rain.
Mon
39° 24°
Mostly Cloudy with a 51% chance of rain.
Tue
39° 23°
Partly Cloudy with a 33% chance of rain.
Wed
38° 24°
Rain, 83% chance.
Thu
38° 23°
Rain, 73% chance.
TimeTempConditionsPrecipWindHumidity
Now 38° Mostly Clear 9% 7 mph N 35%
6 PM 38° Mostly Clear 22% 5 mph N 35%
7 PM 37° Mostly Clear 22% 4 mph NNE 39%
8 PM 34° Mostly Clear 22% 2 mph N 45%
9 PM 33° Partly Cloudy 20% 2 mph W 52%
10 PM 29° Partly Cloudy 10% 4 mph SSW 57%
11 PM 28° Partly Cloudy 10% 4 mph SSW 61%
12 AM 27° Mostly Clear 10% 4 mph SSW 65%
1 AM 27° Mostly Clear 3% 4 mph SW 68%
2 AM 26° Mostly Clear 3% 4 mph SW 70%
3 AM 25° Mostly Clear 7% 3 mph WSW 72%
4 AM 24° Clear 7% 3 mph WNW 74%
5 AM 24° Clear 7% 3 mph WNW 74%
6 AM 22° Clear 8% 3 mph WSW 75%
7 AM 22° Clear 16% 4 mph WSW 75%
8 AM 24° Clear 16% 3 mph W 67%
9 AM 27° Clear 16% 4 mph WSW 56%
10 AM 30° Clear 17% 4 mph WSW 49%
11 AM 31° Clear 17% 4 mph W 45%
12 PM 34° Clear 17% 4 mph WNW 41%
1 PM 36° Clear 20% 4 mph WNW 38%
2 PM 37° Mostly Clear 31% 3 mph NW 37%
3 PM 37° Partly Cloudy 35% 3 mph NNW 36%
4 PM 38° Mostly Cloudy 28% 4 mph NNE 35%
15-Day Forecast
Today
8/21
Mostly Clear
22%
22°
38°
Sat
8/22
Mostly Clear
37%
22°
41°
Sun
8/23
Partly Cloudy
37%
21°
40°
Mon
8/24
Mostly Cloudy
51%
24°
39°
Tue
8/25
Partly Cloudy
33%
23°
39°
Wed
8/26
Rain
83%
24°
38°
Thu
8/27
Rain
73%
23°
38°
Fri
8/28
Mostly Clear
57%
20°
39°
Sat
8/29
Mostly Clear
47%
23°
38°
Sun
8/30
Clear
40%
22°
41°
Mon
8/31
Drizzle
60%
24°
40°
Tue
9/1
Clear
60%
24°
39°
Wed
9/2
Drizzle
60%
24°
39°
Thu
9/3
Drizzle
60%
24°
40°
Fri
9/4
Clear
60%
23°
39°
58
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
58 AQI 12.7 µg/m³
O3
Ground-level ozone
46 AQI 51 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Sat 58 Moderate 46 58
Sun 65 Moderate 41 65
Mon 53 Moderate 43 53
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, 20:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE2188 J/kg
MLCAPE1907 J/kg
MUCAPE2188 J/kg
SBCIN-69 J/kg
MLCIN-128 J/kg
Lifted Index-6.4
Kinematics
0–6 km Shear14 kt
0–1 km Shear5 kt
Eff. Shear11 kt
0–1 km SRH9
0–3 km SRH41
Eff. SRH41
Storm Motion19° @ 22 kt
0–1 km EHI0.1
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index35.7
Thermo & Levels
PWAT1.80 in
0–3 km LR8.4 °C/km
700–500 LR7.0 °C/km
Total Totals50.0
LCL775 hPa
LFC711 hPa
EL160 hPa
Freezing Lvl15,043 ft