Heat Advisory — Grayson, TX, Fannin, TX, Lamar, TX, Denton, TX, Collin, TX, Hunt, TX, Delta, TX, Hopkins, TX, Tarrant, TX, Dallas, TX, Rockwall, TX, Kaufman, TX, Van Zandt, TX, Rains, TX, Johnson, TX, Ellis, TX, Henderson, TX, Hill, TX, Navarro, TX, Freestone, TX, Anderson, TX, Bell, TX, McLennan, TX, Falls, TX, Limestone, TX, Leon, TX, Milam, TX, Robertson, TX 8:00 PM

Jack County, Texas, United States

Last updated: 3:48 PM CDT  ·  Refresh
99°F
Feels like 103°
Clear
▲ 101°  /  ▼ 73°
Wind
11 mph SSE
Humidity
35%
Dew Point
68°
Pressure
28.77 inHg
Visibility
10 mi
UV Index
8.0
Cloud Cover
6%
Sunrise
7:14 AM
Sunset
7:41 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Jack County is currently clear at 99°F. Dry conditions are expected through the next 24 hours. Atmospheric instability is elevated (CAPE up to 1984 J/kg) — isolated convective development possible. Sunrise: 7:14AM · Sunset: 7:41PM.

Alerts

Heat Advisory
Grayson, TX, Fannin, TX, Lamar, TX, Denton, TX, Collin, TX, Hunt, TX, Delta, TX, Hopkins, TX, Tarrant, TX, Dallas, TX, Rockwall, TX, Kaufman, TX, Van Zandt, TX, Rains, TX, Johnson, TX, Ellis, TX, Henderson, TX, Hill, TX, Navarro, TX, Freestone, TX, Anderson, TX, Bell, TX, McLennan, TX, Falls, TX, Limestone, TX, Leon, TX, Milam, TX, Robertson, TX
Expires 8:00 PM
35 AQI · Good Dominant: O3 Air Quality
Hourly Forecast · Next 24 Hours
Now
99°
3%
4 PM
99°
3%
5 PM
101°
3%
6 PM
99°
3%
7 PM
96°
3%
8 PM
93°
3%
9 PM
89°
3%
10 PM
88°
3%
11 PM
86°
3%
12 AM
85°
3%
1 AM
83°
3%
2 AM
82°
3%
3 AM
81°
3%
4 AM
80°
3%
5 AM
74°
3%
6 AM
73°
3%
7 AM
74°
3%
8 AM
76°
3%
9 AM
81°
3%
10 AM
86°
3%
11 AM
87°
3%
12 PM
89°
3%
1 PM
94°
3%
2 PM
94°
3%
7-Day Forecast
Today
101° 73°
Clear.
Mon
103° 73°
Clear.
Tue
103° 70°
Clear.
Wed
99° 71°
Clear.
Thu
96° 72°
Clear.
Fri
97° 72°
Drizzle, 43% chance.
Sat
96° 71°
Clear with a 60% chance of rain.
TimeTempConditionsPrecipWindHumidity
Now 99° Clear 3% 11 mph SSE 35%
4 PM 99° Clear 3% 13 mph SSE 35%
5 PM 101° Clear 3% 13 mph SSE 36%
6 PM 99° Clear 3% 12 mph SSE 37%
7 PM 96° Clear 3% 11 mph SSE 40%
8 PM 93° Clear 3% 10 mph SSE 42%
9 PM 89° Clear 3% 10 mph SSE 44%
10 PM 88° Clear 3% 11 mph SSE 48%
11 PM 86° Clear 3% 12 mph S 53%
12 AM 85° Clear 3% 12 mph S 57%
1 AM 83° Clear 3% 13 mph S 61%
2 AM 82° Clear 3% 13 mph S 66%
3 AM 81° Clear 3% 12 mph S 71%
4 AM 80° Clear 3% 12 mph S 75%
5 AM 74° Clear 3% 11 mph S 78%
6 AM 73° Clear 3% 10 mph S 81%
7 AM 74° Clear 3% 10 mph S 77%
8 AM 76° Clear 3% 12 mph SSW 69%
9 AM 81° Clear 3% 13 mph SSW 63%
10 AM 86° Clear 3% 13 mph SSW 57%
11 AM 87° Clear 3% 13 mph SSW 52%
12 PM 89° Clear 3% 13 mph S 46%
1 PM 94° Clear 3% 14 mph S 44%
2 PM 94° Clear 3% 14 mph S 42%
15-Day Forecast
Today
9/13
Clear
3%
73°
101°
Mon
9/14
Clear
3%
73°
103°
Tue
9/15
Clear
3%
70°
103°
Wed
9/16
Clear
8%
71°
99°
Thu
9/17
Clear
3%
72°
96°
Fri
9/18
Drizzle
43%
72°
97°
Sat
9/19
Clear
60%
71°
96°
Sun
9/20
Drizzle
60%
70°
92°
Mon
9/21
Drizzle
60%
62°
90°
Tue
9/22
Drizzle
60%
60°
90°
Wed
9/23
Drizzle
60%
64°
90°
Thu
9/24
Drizzle
60%
69°
91°
Fri
9/25
Clear
60%
69°
89°
Sat
9/26
Clear
60%
68°
90°
Sun
9/27
Drizzle
60%
69°
90°
35
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
32 AQI 5.8 µg/m³
O3
Ground-level ozone
Dominant
35 AQI 38 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Mon 35 Good 35 32
Tue 32 Good 32 24
Wed 33 Good 33 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 Sun Sep 13, 19:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE2770 J/kg
MLCAPE1486 J/kg
MUCAPE2770 J/kg
SBCIN0 J/kg
MLCIN-33 J/kg
Lifted Index-6.3
Kinematics
0–6 km Shear10 kt
0–1 km Shear1 kt
Eff. Shear10 kt
0–1 km SRH0
0–3 km SRH39
Eff. SRH39
Storm Motion98° @ 15 kt
0–1 km EHI0.0
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index33.7
Thermo & Levels
PWAT1.63 in
0–3 km LR8.6 °C/km
700–500 LR6.6 °C/km
Total Totals50.7
LCL763 hPa
LFC974 hPa
EL143 hPa
Freezing Lvl15,630 ft