Heat Advisory — Montague, TX, Cooke, TX, Grayson, TX, Fannin, TX, Lamar, TX, Young, TX, Jack, TX, Wise, TX, Denton, TX, Collin, TX, Hunt, TX, Delta, TX, Hopkins, TX, Palo Pinto, TX, Parker, TX, Tarrant, TX, Dallas, TX, Rockwall, TX, Kaufman, TX, Van Zandt, TX, Rains, TX, Hood, TX, Somervell, TX, Johnson, TX, Ellis, TX, Henderson, TX, Navarro, TX, Freestone, TX, Anderson, TX, Leon, TX 8:00 PM

Johnson County, Texas, United States

Last updated: 1:41 AM CDT  ·  Refresh
28°C
Feels like 29°
Clear
▲ 38°  /  ▼ 23°
Wind
8 mph S
Humidity
59%
Dew Point
19°
Pressure
29.08 inHg
Visibility
10 mi
UV Index
0.0
Cloud Cover
1%
Sunrise
6:40 AM
Sunset
8:30 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Johnson County is currently clear at 28°C. Dry conditions are expected through the next 24 hours. Atmospheric instability is elevated (CAPE up to 679 J/kg) — isolated convective development possible. Sunrise: 6:40AM · Sunset: 8:30PM.

Alerts

Heat Advisory
Montague, TX, Cooke, TX, Grayson, TX, Fannin, TX, Lamar, TX, Young, TX, Jack, TX, Wise, TX, Denton, TX, Collin, TX, Hunt, TX, Delta, TX, Hopkins, TX, Palo Pinto, TX, Parker, TX, Tarrant, TX, Dallas, TX, Rockwall, TX, Kaufman, TX, Van Zandt, TX, Rains, TX, Hood, TX, Somervell, TX, Johnson, TX, Ellis, TX, Henderson, TX, Navarro, TX, Freestone, TX, Anderson, TX, Leon, TX
Expires 8:00 PM
52 AQI · Moderate Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
28°
3%
2 AM
27°
3%
3 AM
26°
3%
4 AM
26°
3%
5 AM
23°
3%
6 AM
23°
3%
7 AM
24°
3%
8 AM
26°
3%
9 AM
29°
3%
10 AM
31°
3%
11 AM
32°
3%
12 PM
34°
3%
1 PM
36°
3%
2 PM
37°
3%
3 PM
38°
3%
4 PM
38°
3%
5 PM
38°
3%
6 PM
38°
3%
7 PM
37°
3%
8 PM
34°
3%
9 PM
32°
3%
10 PM
31°
3%
11 PM
30°
3%
12 AM
29°
3%
7-Day Forecast
Today
38° 23°
Clear.
Tue
40° 23°
Mostly Clear.
Wed
38° 23°
Mostly Clear.
Thu
39° 25°
Clear.
Fri
41° 26°
Clear.
Sat
40° 26°
Clear.
Sun
38° 23°
Clear.
TimeTempConditionsPrecipWindHumidity
Now 28° Clear 3% 8 mph S 58%
2 AM 27° Clear 3% 9 mph S 60%
3 AM 26° Clear 3% 9 mph SSW 64%
4 AM 26° Clear 3% 9 mph SSW 68%
5 AM 23° Clear 3% 9 mph SSW 71%
6 AM 23° Clear 3% 9 mph SSW 74%
7 AM 24° Clear 3% 10 mph SSW 72%
8 AM 26° Clear 3% 11 mph SSW 66%
9 AM 29° Clear 3% 12 mph SSW 59%
10 AM 31° Clear 3% 12 mph SSW 52%
11 AM 32° Clear 3% 12 mph SSW 46%
12 PM 34° Clear 3% 11 mph SSW 40%
1 PM 36° Clear 3% 11 mph S 36%
2 PM 37° Clear 3% 12 mph S 34%
3 PM 38° Clear 3% 12 mph S 32%
4 PM 38° Clear 3% 12 mph S 31%
5 PM 38° Clear 3% 12 mph S 31%
6 PM 38° Clear 3% 12 mph S 31%
7 PM 37° Clear 3% 12 mph S 34%
8 PM 34° Clear 3% 11 mph S 38%
9 PM 32° Clear 3% 10 mph S 41%
10 PM 31° Clear 3% 10 mph S 44%
11 PM 30° Clear 3% 10 mph S 46%
12 AM 29° Clear 3% 10 mph S 48%
15-Day Forecast
Today
7/27
Clear
3%
23°
38°
Tue
7/28
Mostly Clear
3%
23°
40°
Wed
7/29
Mostly Clear
3%
23°
38°
Thu
7/30
Clear
7%
25°
39°
Fri
7/31
Clear
16%
26°
41°
Sat
8/1
Clear
8%
26°
40°
Sun
8/2
Clear
8%
23°
38°
Mon
8/3
Clear
18%
23°
39°
Tue
8/4
Drizzle
44%
23°
38°
Wed
8/5
Clear
19%
23°
38°
Thu
8/6
Drizzle
60%
26°
38°
Fri
8/7
Drizzle
60%
26°
38°
Sat
8/8
Drizzle
60%
26°
37°
Sun
8/9
Drizzle
60%
25°
38°
Mon
8/10
Drizzle
60%
26°
38°
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 9.9 µg/m³
O3
Ground-level ozone
37 AQI 40 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Today 52 Moderate 37 52
Tue 37 Good 37 37
Wed 52 Moderate 38 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 LCL0°C Temperature (°C) Pressure (hPa)
Temp Dewpoint Parcel (SB) CAPE CIN Dry adiabat Moist adiabat Mixing ratio
RAP
Valid Mon Jul 27, 05:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE0 J/kg
MLCAPE8 J/kg
MUCAPE80 J/kg
SBCIN-3467 J/kg
MLCIN0 J/kg
Lifted Index3.5
Kinematics
0–6 km Shear18 kt
0–1 km Shear11 kt
Eff. Shear—
0–1 km SRH74
0–3 km SRH34
Eff. SRH—
Storm Motion279° @ 13 kt
0–1 km EHI0.0
Composite Parameters
Sig. Tornado0.0
STP (eff)—
Supercell—
K-Index25.4
Thermo & Levels
PWAT1.22 in
0–3 km LR4.9 °C/km
700–500 LR5.3 °C/km
Total Totals36.6
LCL872 hPa
LFC—
EL—
Freezing Lvl18,192 ft