Severe Thunderstorm Watch 11:00 PM

Washington, District of Columbia

Last updated: 10:36 PM CDT  ·  Refresh
23°C
Feels like 24°
Overcast
▲ 32°  /  ▼ 21°
Wind
9 mph SSW
Humidity
93%
Dew Point
21°
Pressure
29.63 inHg
Visibility
2 mi
UV Index
0.0
Cloud Cover
97%
Sunrise
5:59 AM
Sunset
8:28 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Washington is currently overcast at 23°C. Precipitation is likely — peak probability 62% around 12 AM. Atmospheric instability is elevated (CAPE up to 1147 J/kg) — isolated convective development possible. Sunrise: 5:59AM · Sunset: 8:28PM.

Alerts

Severe Thunderstorm Watch
Expires 11:00 PM
42 AQI · Good Dominant: O3 Air Quality
Hourly Forecast · Next 24 Hours
Now
23°
44%
12 AM
23°
61%
1 AM
23°
57%
2 AM
23°
49%
3 AM
23°
32%
4 AM
22°
19%
5 AM
21°
27%
6 AM
22°
34%
7 AM
22°
35%
8 AM
23°
36%
9 AM
24°
36%
10 AM
26°
32%
11 AM
27°
33%
12 PM
27°
30%
1 PM
29°
30%
2 PM
29°
31%
3 PM
29°
32%
4 PM
29°
31%
5 PM
29°
30%
6 PM
28°
27%
7 PM
28°
19%
8 PM
27°
19%
9 PM
26°
19%
10 PM
26°
19%
7-Day Forecast
Tonight
32° 21°
Overcast with a 44% chance of rain.
Wed
31° 21°
Partly Cloudy with a 49% chance of rain.
Thu
29° 19°
Mostly Clear.
Fri
29° 17°
Overcast with a 37% chance of rain.
Sat
28° 19°
Partly Cloudy with a 26% chance of rain.
Sun
32° 19°
Rain, 70% chance.
Mon
34° 21°
Rain, 64% chance.
TimeTempConditionsPrecipWindHumidity
Now 23° Overcast 44% 9 mph SSW 93%
12 AM 23° Overcast 61% 9 mph SSW 93%
1 AM 23° Rain 57% 9 mph SW 92%
2 AM 23° Rain 49% 9 mph SW 92%
3 AM 23° Partly Cloudy 32% 8 mph SW 93%
4 AM 22° Partly Cloudy 19% 7 mph SSW 93%
5 AM 21° Partly Cloudy 27% 6 mph SSW 93%
6 AM 22° Partly Cloudy 34% 6 mph SW 92%
7 AM 22° Partly Cloudy 35% 7 mph SW 91%
8 AM 23° Partly Cloudy 36% 7 mph WSW 86%
9 AM 24° Partly Cloudy 36% 7 mph WSW 78%
10 AM 26° Partly Cloudy 32% 8 mph W 70%
11 AM 27° Partly Cloudy 33% 8 mph W 65%
12 PM 27° Mostly Clear 30% 8 mph W 60%
1 PM 29° Mostly Clear 30% 8 mph W 56%
2 PM 29° Mostly Clear 31% 8 mph W 53%
3 PM 29° Mostly Clear 32% 8 mph W 51%
4 PM 29° Partly Cloudy 31% 8 mph WNW 49%
5 PM 29° Partly Cloudy 30% 7 mph WNW 50%
6 PM 28° Partly Cloudy 27% 6 mph WNW 54%
7 PM 28° Partly Cloudy 19% 6 mph NW 58%
8 PM 27° Partly Cloudy 19% 6 mph NW 59%
9 PM 26° Partly Cloudy 19% 7 mph NNW 58%
10 PM 26° Partly Cloudy 19% 7 mph NNW 58%
15-Day Forecast
Today
7/21
Overcast
44%
21°
32°
Wed
7/22
Partly Cloudy
49%
21°
31°
Thu
7/23
Mostly Clear
3%
19°
29°
Fri
7/24
Overcast
37%
17°
29°
Sat
7/25
Partly Cloudy
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
Drizzle
44%
21°
31°
Thu
7/30
Drizzle
44%
19°
31°
Fri
7/31
Drizzle
60%
18°
31°
Sat
8/1
Drizzle
60%
22°
32°
Sun
8/2
Drizzle
60%
22°
32°
Mon
8/3
Drizzle
60%
23°
33°
Tue
8/4
Drizzle
60%
23°
34°
42
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
23 AQI 4.1 µg/m³
O3
Ground-level ozone
Dominant
42 AQI 46 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Today 42 Good 42 23
Thu 40 Good 40 13
Fri 44 Good 44 17
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
SBCAPE180 J/kg
MLCAPE155 J/kg
MUCAPE385 J/kg
SBCIN-133 J/kg
MLCIN0 J/kg
Lifted Index-1.0
Kinematics
0–6 km Shear36 kt
0–1 km Shear25 kt
Eff. Shear34 kt
0–1 km SRH-34
0–3 km SRH-38
Eff. SRH-38
Storm Motion235° @ 35 kt
0–1 km EHI-0.0
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index33.8
Thermo & Levels
PWAT2.09 in
0–3 km LR4.6 °C/km
700–500 LR5.5 °C/km
Total Totals45.6
LCL987 hPa
LFC717 hPa
EL356 hPa
Freezing Lvl14,869 ft