Severe Thunderstorm Watch 11:00 PM

Arlington County, Virginia, United States

Last updated: 10:34 PM CDT  ·  Refresh
22°C
Feels like 23°
Haze
▲ 32°  /  ▼ 21°
Wind
9 mph SW
Humidity
92%
Dew Point
21°
Pressure
29.54 inHg
Visibility
1 mi
UV Index
0.0
Cloud Cover
94%
Sunrise
6:00 AM
Sunset
8:29 PM
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WeatherAI™ Analysis

WeatherAI Analysis: Arlington County is currently haze at 22°C. Precipitation is likely — peak probability 62% around 12 AM. Atmospheric instability is elevated (CAPE up to 1118 J/kg) — isolated convective development possible. Sunrise: 6:00AM · Sunset: 8:29PM.

Alerts

Severe Thunderstorm Watch
Expires 11:00 PM
41 AQI · Good Dominant: O3 Air Quality
Hourly Forecast · Next 24 Hours
Now
22°
48%
12 AM
23°
61%
1 AM
23°
57%
2 AM
23°
49%
3 AM
23°
22%
4 AM
23°
26%
5 AM
22°
34%
6 AM
22°
34%
7 AM
23°
35%
8 AM
24°
36%
9 AM
24°
33%
10 AM
26°
28%
11 AM
27°
40%
12 PM
27°
41%
1 PM
29°
31%
2 PM
29°
31%
3 PM
29°
24%
4 PM
29°
24%
5 PM
29°
22%
6 PM
27°
18%
7 PM
27°
19%
8 PM
26°
19%
9 PM
26°
19%
10 PM
25°
19%
7-Day Forecast
Tonight
32° 21°
Haze with a 48% chance of rain.
Wed
31° 21°
Partly Cloudy with a 49% chance of rain.
Thu
28° 19°
Mostly Clear.
Fri
29° 17°
Overcast with a 37% chance of rain.
Sat
28° 19°
Mostly Clear with a 26% chance of rain.
Sun
32° 19°
Rain, 70% chance.
Mon
34° 21°
Rain, 64% chance.
TimeTempConditionsPrecipWindHumidity
Now 22° Haze 48% 9 mph SW 92%
12 AM 23° Overcast 61% 9 mph SSW 92%
1 AM 23° Rain 57% 9 mph SW 92%
2 AM 23° Mostly Cloudy 49% 8 mph SW 93%
3 AM 23° Partly Cloudy 22% 8 mph SSW 94%
4 AM 23° Partly Cloudy 26% 6 mph SSW 94%
5 AM 22° Partly Cloudy 34% 6 mph SSW 94%
6 AM 22° Partly Cloudy 34% 6 mph SW 92%
7 AM 23° Partly Cloudy 35% 6 mph SW 91%
8 AM 24° Partly Cloudy 36% 6 mph WSW 86%
9 AM 24° Partly Cloudy 33% 7 mph WSW 78%
10 AM 26° Partly Cloudy 28% 7 mph W 71%
11 AM 27° Partly Cloudy 40% 8 mph W 64%
12 PM 27° Partly Cloudy 41% 8 mph W 58%
1 PM 29° Mostly Clear 31% 9 mph W 52%
2 PM 29° Mostly Clear 31% 9 mph W 49%
3 PM 29° Partly Cloudy 24% 9 mph WNW 50%
4 PM 29° Partly Cloudy 24% 8 mph WNW 50%
5 PM 29° Partly Cloudy 22% 8 mph WNW 52%
6 PM 27° Partly Cloudy 18% 7 mph NW 56%
7 PM 27° Partly Cloudy 19% 6 mph NW 58%
8 PM 26° Partly Cloudy 19% 6 mph NW 59%
9 PM 26° Partly Cloudy 19% 7 mph NNW 59%
10 PM 25° Partly Cloudy 19% 7 mph NNW 59%
15-Day Forecast
Today
7/21
Haze
48%
21°
32°
Wed
7/22
Partly Cloudy
49%
21°
31°
Thu
7/23
Mostly Clear
3%
19°
28°
Fri
7/24
Overcast
37%
17°
29°
Sat
7/25
Mostly Clear
26%
19°
28°
Sun
7/26
Rain
70%
19°
32°
Mon
7/27
Rain
64%
21°
34°
Tue
7/28
Thunderstorm
71%
21°
35°
Wed
7/29
Rain
44%
20°
31°
Thu
7/30
Drizzle
44%
19°
31°
Fri
7/31
Drizzle
60%
18°
31°
Sat
8/1
Drizzle
60%
21°
31°
Sun
8/2
Drizzle
60%
22°
31°
Mon
8/3
Drizzle
60%
22°
33°
Tue
8/4
Drizzle
60%
23°
34°
41
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
24 AQI 4.5 µg/m³
O3
Ground-level ozone
Dominant
41 AQI 44 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Today 41 Good 41 24
Thu 38 Good 38 13
Fri 44 Good 44 18
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, 02:00'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
SBCAPE107 J/kg
MLCAPE189 J/kg
MUCAPE429 J/kg
SBCIN-177 J/kg
MLCIN0 J/kg
Lifted Index-0.6
Kinematics
0–6 km Shear35 kt
0–1 km Shear24 kt
Eff. Shear34 kt
0–1 km SRH-15
0–3 km SRH-22
Eff. SRH-22
Storm Motion239° @ 35 kt
0–1 km EHI-0.0
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index34.0
Thermo & Levels
PWAT2.04 in
0–3 km LR4.6 °C/km
700–500 LR5.5 °C/km
Total Totals45.9
LCL983 hPa
LFC700 hPa
EL387 hPa
Freezing Lvl14,606 ft