Heat Advisory — Montague, TX, Cooke, TX, Grayson, TX, Fannin, TX, Lamar, 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, Johnson, TX, Ellis, TX 8:00 PM

Johnson County, Texas, United States

Last updated: 5:11 AM CDT  ·  Refresh
26°C
Feels like 26°
Clear
▲ 38°  /  ▼ 24°
Wind
11 mph S
Humidity
76%
Dew Point
21°
Pressure
29.18 inHg
Visibility
10 mi
UV Index
0.0
Cloud Cover
2%
Sunrise
6:50 AM
Sunset
8:17 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Johnson County is currently clear at 25°C. Dry conditions are expected through the next 24 hours. Atmospheric instability is elevated (CAPE up to 1658 J/kg) — isolated convective development possible. Sunrise: 6:50AM · Sunset: 8:17PM.

Alerts

Heat Advisory
Montague, TX, Cooke, TX, Grayson, TX, Fannin, TX, Lamar, 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, Johnson, TX, Ellis, TX
Expires 8:00 PM
37 AQI · Good Dominant: O3 Air Quality
Hourly Forecast · Next 24 Hours
Now
26°
3%
6 AM
23°
3%
7 AM
23°
3%
8 AM
25°
3%
9 AM
27°
3%
10 AM
29°
3%
11 AM
31°
3%
12 PM
33°
3%
1 PM
34°
3%
2 PM
37°
3%
3 PM
37°
3%
4 PM
38°
3%
5 PM
37°
3%
6 PM
38°
3%
7 PM
37°
3%
8 PM
36°
3%
9 PM
35°
3%
10 PM
32°
3%
11 PM
32°
3%
12 AM
29°
3%
1 AM
29°
3%
2 AM
29°
3%
3 AM
28°
3%
4 AM
27°
3%
7-Day Forecast
Today
38° 24°
Clear.
Wed
40° 24°
Clear.
Thu
39° 23°
Mostly Clear.
Fri
39° 22°
Clear.
Sat
41° 24°
Partly Cloudy.
Sun
41° 24°
Clear.
Mon
41° 24°
Clear.
TimeTempConditionsPrecipWindHumidity
Now 26° Clear 3% 11 mph S 76%
6 AM 23° Clear 3% 11 mph S 77%
7 AM 23° Clear 3% 11 mph SSW 78%
8 AM 25° Clear 3% 12 mph SSW 73%
9 AM 27° Clear 3% 14 mph SSW 67%
10 AM 29° Clear 3% 15 mph SSW 60%
11 AM 31° Clear 3% 14 mph SSW 52%
12 PM 33° Mostly Clear 3% 14 mph SSW 45%
1 PM 34° Mostly Clear 3% 13 mph SSW 38%
2 PM 37° Mostly Clear 3% 13 mph SSW 35%
3 PM 37° Mostly Clear 3% 14 mph S 32%
4 PM 38° Mostly Clear 3% 15 mph S 31%
5 PM 37° Mostly Clear 3% 15 mph S 32%
6 PM 38° Mostly Clear 3% 15 mph S 33%
7 PM 37° Clear 3% 15 mph S 34%
8 PM 36° Clear 3% 15 mph S 38%
9 PM 35° Clear 3% 14 mph S 42%
10 PM 32° Clear 3% 14 mph S 46%
11 PM 32° Clear 3% 14 mph S 51%
12 AM 29° Clear 3% 16 mph S 56%
1 AM 29° Clear 3% 16 mph S 60%
2 AM 29° Clear 3% 15 mph S 63%
3 AM 28° Clear 3% 14 mph S 66%
4 AM 27° Clear 3% 14 mph S 69%
15-Day Forecast
Today
8/11
Clear
3%
24°
38°
Wed
8/12
Clear
3%
24°
40°
Thu
8/13
Mostly Clear
3%
23°
39°
Fri
8/14
Clear
3%
22°
39°
Sat
8/15
Partly Cloudy
3%
24°
41°
Sun
8/16
Clear
17%
24°
41°
Mon
8/17
Clear
12%
24°
41°
Tue
8/18
Clear
15%
26°
41°
Wed
8/19
Clear
35%
26°
41°
Thu
8/20
Clear
35%
26°
40°
Fri
8/21
Drizzle
60%
26°
41°
Sat
8/22
Clear
60%
26°
41°
Sun
8/23
Drizzle
60%
27°
40°
Mon
8/24
Drizzle
60%
26°
40°
Tue
8/25
Drizzle
60%
26°
39°
37
Good
U.S. Air Quality Index · Dominant: O3
50 100 150 200

Air quality is satisfactory and poses little or no health risk.

Pollutant Breakdown · Today
PM2.5
Fine particulate matter
22 AQI 3.9 µg/m³
O3
Ground-level ozone
Dominant
37 AQI 40 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Today 37 Good 37 22
Wed 55 Moderate 35 55
Thu 37 Good 37 29
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 Tue Aug 11, 08:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE492 J/kg
MLCAPE162 J/kg
MUCAPE492 J/kg
SBCIN-292 J/kg
MLCIN0 J/kg
Lifted Index-1.8
Kinematics
0–6 km Shear7 kt
0–1 km Shear9 kt
Eff. Shear11 kt
0–1 km SRH-24
0–3 km SRH43
Eff. SRH34
Storm Motion124° @ 15 kt
0–1 km EHI-0.1
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index28.1
Thermo & Levels
PWAT1.58 in
0–3 km LR4.8 °C/km
700–500 LR6.2 °C/km
Total Totals46.7
LCL926 hPa
LFC629 hPa
EL225 hPa
Freezing Lvl15,686 ft