Severe Thunderstorm Watch 12:00 AM

Prince William County, Virginia, United States

Last updated: 11:56 PM CDT  ·  Refresh
22°C
Feels like 23°
Rain
▲ 31°  /  ▼ 17°
Wind
8 mph SSW
Humidity
94%
Dew Point
21°
Pressure
29.48 inHg
Visibility
10 mi
UV Index
0.0
Cloud Cover
87%
Sunrise
6:03 AM
Sunset
8:29 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Prince William County is currently rain at 21°C. Precipitation is likely — peak probability 57% around 12 AM. Atmospheric instability is elevated (CAPE up to 1113 J/kg) — isolated convective development possible. Sunrise: 6:03AM · Sunset: 8:29PM.

Alerts

Severe Thunderstorm Watch
Expires 12:00 AM
34 AQI · Good Dominant: O3 Air Quality
Hourly Forecast · Next 24 Hours
Now
22°
56%
1 AM
22°
55%
2 AM
22°
56%
3 AM
22°
26%
4 AM
22°
28%
5 AM
20°
38%
6 AM
21°
40%
7 AM
22°
40%
8 AM
24°
41%
9 AM
25°
37%
10 AM
26°
33%
11 AM
27°
25%
12 PM
28°
26%
1 PM
30°
22%
2 PM
29°
23%
3 PM
29°
23%
4 PM
28°
24%
5 PM
29°
24%
6 PM
28°
20%
7 PM
27°
21%
8 PM
26°
11%
9 PM
25°
11%
10 PM
24°
12%
11 PM
24°
9%
7-Day Forecast
Today
31° 17°
Partly Cloudy with a 56% chance of rain.
Thu
28° 17°
Mostly Clear.
Fri
29° 16°
Mostly Cloudy with a 32% chance of rain.
Sat
27° 18°
Mostly Cloudy with a 37% chance of rain.
Sun
32° 18°
Rain, 82% chance.
Mon
34° 19°
Rain, 64% chance.
Tue
37° 19°
Rain, 71% chance.
TimeTempConditionsPrecipWindHumidity
Now 22° Rain 56% 8 mph SSW 94%
1 AM 22° Rain 55% 9 mph SSW 93%
2 AM 22° Mostly Cloudy 56% 8 mph SSW 94%
3 AM 22° Partly Cloudy 26% 7 mph SW 96%
4 AM 22° Partly Cloudy 28% 5 mph SSW 97%
5 AM 20° Partly Cloudy 38% 5 mph SSW 95%
6 AM 21° Partly Cloudy 40% 6 mph SW 94%
7 AM 22° Partly Cloudy 40% 6 mph WSW 92%
8 AM 24° Partly Cloudy 41% 6 mph WSW 83%
9 AM 25° Mostly Cloudy 37% 6 mph W 75%
10 AM 26° Mostly Cloudy 33% 7 mph W 66%
11 AM 27° Partly Cloudy 25% 7 mph W 60%
12 PM 28° Partly Cloudy 26% 8 mph W 54%
1 PM 30° Partly Cloudy 22% 8 mph W 48%
2 PM 29° Partly Cloudy 23% 8 mph W 49%
3 PM 29° Partly Cloudy 23% 7 mph WNW 51%
4 PM 28° Mostly Clear 24% 7 mph WNW 55%
5 PM 29° Partly Cloudy 24% 6 mph NW 56%
6 PM 28° Partly Cloudy 20% 6 mph NW 59%
7 PM 27° Partly Cloudy 21% 6 mph NNW 60%
8 PM 26° Partly Cloudy 11% 7 mph NNW 58%
9 PM 25° Partly Cloudy 11% 7 mph NNW 56%
10 PM 24° Partly Cloudy 12% 8 mph NNW 55%
11 PM 24° Partly Cloudy 9% 8 mph NNW 56%
15-Day Forecast
Today
7/22
Partly Cloudy
56%
17°
31°
Thu
7/23
Mostly Clear
3%
17°
28°
Fri
7/24
Mostly Cloudy
32%
16°
29°
Sat
7/25
Mostly Cloudy
37%
18°
27°
Sun
7/26
Rain
82%
18°
32°
Mon
7/27
Rain
64%
19°
34°
Tue
7/28
Rain
71%
19°
37°
Wed
7/29
Rain
68%
18°
32°
Thu
7/30
Drizzle
44%
17°
31°
Fri
7/31
Drizzle
51%
17°
31°
Sat
8/1
Drizzle
60%
18°
31°
Sun
8/2
Drizzle
60%
18°
31°
Mon
8/3
Drizzle
60%
19°
33°
Tue
8/4
Drizzle
60%
19°
33°
Wed
8/5
Drizzle
60%
20°
33°
34
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
25 AQI 4.5 µg/m³
O3
Ground-level ozone
Dominant
34 AQI 38 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Today 34 Good 34 25
Thu 36 Good 36 15
Fri 39 Good 39 23
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 Wed Jul 22, 03:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 50 60 70 80 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE64 J/kg
MLCAPE230 J/kg
MUCAPE327 J/kg
SBCIN-263 J/kg
MLCIN0 J/kg
Lifted Index-0.2
Kinematics
0–6 km Shear37 kt
0–1 km Shear27 kt
Eff. Shear24 kt
0–1 km SRH-9
0–3 km SRH-4
Eff. SRH-27
Storm Motion228° @ 33 kt
0–1 km EHI-0.0
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index33.1
Thermo & Levels
PWAT1.94 in
0–3 km LR4.4 °C/km
700–500 LR5.7 °C/km
Total Totals46.4
LCL984 hPa
LFC681 hPa
EL487 hPa
Freezing Lvl14,055 ft