Severe Thunderstorm Watch 11:00 PM

Washington County, Maryland, United States

Last updated: 10:32 PM CDT  ·  Refresh
21°C
Feels like 22°
Mostly Cloudy
▲ 29°  /  ▼ 19°
Wind
6 mph S
Humidity
94%
Dew Point
19°
Pressure
29.16 inHg
Visibility
10 mi
UV Index
0.0
Cloud Cover
71%
Sunrise
6:00 AM
Sunset
8:33 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Washington County is currently mostly cloudy at 20°C. Dry conditions are expected through the next 24 hours. Atmospheric instability is elevated (CAPE up to 798 J/kg) — isolated convective development possible. Sunrise: 6:00AM · Sunset: 8:33PM.

Alerts

Severe Thunderstorm Watch
Expires 11:00 PM
54 AQI · Moderate Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
21°
20%
12 AM
20°
27%
1 AM
20°
27%
2 AM
20°
6%
3 AM
20°
7%
4 AM
20°
11%
5 AM
19°
23%
6 AM
19°
7%
7 AM
20°
8%
8 AM
22°
8%
9 AM
23°
7%
10 AM
24°
19%
11 AM
25°
19%
12 PM
26°
11%
1 PM
26°
9%
2 PM
27°
6%
3 PM
27°
6%
4 PM
27°
7%
5 PM
27°
7%
6 PM
26°
3%
7 PM
24°
3%
8 PM
23°
3%
9 PM
22°
3%
10 PM
21°
3%
7-Day Forecast
Tonight
29° 19°
Mostly Cloudy with a 20% chance of rain.
Wed
27° 16°
Mostly Clear with a 23% chance of rain.
Thu
26° 13°
Clear.
Fri
27° 13°
Overcast with a 32% chance of rain.
Sat
26° 16°
Partly Cloudy.
Sun
30° 16°
Rain, 70% chance.
Mon
32° 19°
Rain, 71% chance.
TimeTempConditionsPrecipWindHumidity
Now 21° Mostly Cloudy 20% 6 mph S 94%
12 AM 20° Mostly Cloudy 27% 6 mph SSE 94%
1 AM 20° Partly Cloudy 27% 6 mph SSE 95%
2 AM 20° Partly Cloudy 6% 5 mph S 95%
3 AM 20° Partly Cloudy 7% 4 mph S 96%
4 AM 20° Partly Cloudy 11% 3 mph S 96%
5 AM 19° Partly Cloudy 23% 3 mph SSW 96%
6 AM 19° Mostly Clear 7% 3 mph SW 94%
7 AM 20° Mostly Clear 8% 4 mph WSW 93%
8 AM 22° Mostly Clear 8% 5 mph W 88%
9 AM 23° Mostly Clear 7% 8 mph W 79%
10 AM 24° Mostly Clear 19% 9 mph WNW 71%
11 AM 25° Partly Cloudy 19% 10 mph W 65%
12 PM 26° Partly Cloudy 11% 10 mph W 61%
1 PM 26° Partly Cloudy 9% 11 mph W 58%
2 PM 27° Partly Cloudy 6% 11 mph W 56%
3 PM 27° Partly Cloudy 6% 12 mph W 54%
4 PM 27° Mostly Clear 7% 12 mph WNW 53%
5 PM 27° Mostly Clear 7% 11 mph WNW 53%
6 PM 26° Mostly Clear 3% 10 mph WNW 56%
7 PM 24° Clear 3% 9 mph NW 59%
8 PM 23° Clear 3% 9 mph NW 61%
9 PM 22° Mostly Clear 3% 8 mph NW 64%
10 PM 21° Mostly Clear 3% 8 mph NNW 66%
15-Day Forecast
Today
7/21
Mostly Cloudy
20%
19°
29°
Wed
7/22
Mostly Clear
23%
16°
27°
Thu
7/23
Clear
3%
13°
26°
Fri
7/24
Overcast
32%
13°
27°
Sat
7/25
Partly Cloudy
8%
16°
26°
Sun
7/26
Rain
70%
16°
30°
Mon
7/27
Rain
71%
19°
32°
Tue
7/28
Rain
63%
17°
34°
Wed
7/29
Drizzle
44%
16°
29°
Thu
7/30
Drizzle
44%
15°
29°
Fri
7/31
Clear
60%
15°
29°
Sat
8/1
Drizzle
60%
16°
28°
Sun
8/2
Drizzle
60%
17°
29°
Mon
8/3
Drizzle
60%
17°
30°
Tue
8/4
Drizzle
60%
18°
31°
54
Moderate
U.S. Air Quality Index · Dominant: PM2.5
50 100 150 200

Air quality is acceptable. Unusually sensitive people should consider limiting prolonged outdoor exertion.

Pollutant Breakdown · Today
PM2.5
Fine particulate matter
Dominant
54 AQI 11.0 µg/m³
O3
Ground-level ozone
35 AQI 39 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Today 54 Moderate 35 54
Thu 36 Good 36 11
Fri 36 Good 36 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 LCL0°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
SBCAPE0 J/kg
MLCAPE112 J/kg
MUCAPE510 J/kg
SBCIN-5769 J/kg
MLCIN0 J/kg
Lifted Index0.9
Kinematics
0–6 km Shear36 kt
0–1 km Shear37 kt
Eff. Shear12 kt
0–1 km SRH-30
0–3 km SRH6
Eff. SRH25
Storm Motion239° @ 36 kt
0–1 km EHI-0.0
Composite Parameters
Sig. Tornado-0.0
STP (eff)0.0
Supercell0.1
K-Index32.4
Thermo & Levels
PWAT1.69 in
0–3 km LR4.1 °C/km
700–500 LR5.9 °C/km
Total Totals47.1
LCL971 hPa
LFC—
EL—
Freezing Lvl14,127 ft