Flash Flood Warning — Allegheny County, PA, Fayette County, PA, Greene County, PA, Washington County, PA, Westmoreland County, PA 12:00 PM Areal Flood Watch 1:00 PM Flood Warning — Greene County, PA, Washington County, PA, Brooke County, WV, Marshall County, WV, Ohio County, WV 2:45 PM

Washington County, Pennsylvania, United States

Last updated: 11:54 AM CDT  ·  Refresh
21°C
Feels like 23°
Overcast
▲ 24°  /  ▼ 15°
Wind
4 mph N
Humidity
91%
Dew Point
19°
Pressure
28.77 inHg
Visibility
2 mi
UV Index
2.8
Cloud Cover
97%
Sunrise
6:37 AM
Sunset
8:10 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Washington County is currently overcast at 21°C. Precipitation is likely — peak probability 66% around 4 PM. Atmospheric instability is elevated (CAPE up to 523 J/kg) — isolated convective development possible. Sunrise: 6:37AM · Sunset: 8:10PM.

Alerts

Flash Flood Warning
Allegheny County, PA, Fayette County, PA, Greene County, PA, Washington County, PA, Westmoreland County, PA
Expires 12:00 PM
Areal Flood Watch
Expires 1:00 PM
Flood Warning
Greene County, PA, Washington County, PA, Brooke County, WV, Marshall County, WV, Ohio County, WV
Expires 2:45 PM
49 AQI · Good Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
21°
59%
1 PM
23°
44%
2 PM
23°
64%
3 PM
22°
65%
4 PM
22°
65%
5 PM
23°
58%
6 PM
22°
34%
7 PM
22°
21%
8 PM
21°
21%
9 PM
19°
21%
10 PM
18°
10%
11 PM
18°
3%
12 AM
17°
6%
1 AM
17°
6%
2 AM
16°
6%
3 AM
16°
6%
4 AM
16°
6%
5 AM
15°
8%
6 AM
15°
21%
7 AM
16°
21%
8 AM
16°
25%
9 AM
17°
15%
10 AM
18°
16%
11 AM
19°
26%
7-Day Forecast
Today
24° 15°
Rain, 65% chance.
Fri
26° 15°
Mostly Clear with a 33% chance of rain.
Sat
28° 15°
Mostly Clear with a 56% chance of rain.
Sun
24° 14°
Mostly Cloudy with a 69% chance of rain.
Mon
25° 12°
Clear.
Tue
27° 13°
Clear.
Wed
26° 16°
Rain, 28% chance.
TimeTempConditionsPrecipWindHumidity
Now 21° Overcast 59% 4 mph N 91%
1 PM 23° Overcast 44% 4 mph NNW 85%
2 PM 23° Rain 64% 4 mph NW 85%
3 PM 22° Rain 65% 5 mph N 84%
4 PM 22° Mostly Cloudy 65% 6 mph N 84%
5 PM 23° Mostly Cloudy 58% 6 mph NNE 86%
6 PM 22° Partly Cloudy 34% 6 mph NNE 89%
7 PM 22° Mostly Clear 21% 5 mph NE 90%
8 PM 21° Mostly Clear 21% 4 mph NE 92%
9 PM 19° Mostly Clear 21% 4 mph NE 93%
10 PM 18° Mostly Clear 10% 4 mph ENE 95%
11 PM 18° Mostly Clear 3% 4 mph ENE 96%
12 AM 17° Partly Cloudy 6% 4 mph NE 96%
1 AM 17° Fog 6% 4 mph NE 97%
2 AM 16° Fog 6% 4 mph NE 97%
3 AM 16° Fog 6% 4 mph NE 97%
4 AM 16° Fog 6% 5 mph NE 97%
5 AM 15° Fog 8% 5 mph NE 96%
6 AM 15° Fog 21% 5 mph NE 95%
7 AM 16° Fog 21% 5 mph NE 94%
8 AM 16° Fog 25% 5 mph ENE 92%
9 AM 17° Fog 15% 5 mph ENE 90%
10 AM 18° Fog 16% 5 mph ENE 87%
11 AM 19° Partly Cloudy 26% 5 mph ENE 82%
15-Day Forecast
Today
8/20
Rain
65%
15°
24°
Fri
8/21
Mostly Clear
33%
15°
26°
Sat
8/22
Mostly Clear
56%
15°
28°
Sun
8/23
Mostly Cloudy
69%
14°
24°
Mon
8/24
Clear
8%
12°
25°
Tue
8/25
Clear
8%
13°
27°
Wed
8/26
Rain
28%
16°
26°
Thu
8/27
Rain
69%
16°
27°
Fri
8/28
Rain
68%
16°
28°
Sat
8/29
Drizzle
51%
17°
29°
Sun
8/30
Drizzle
60%
18°
29°
Mon
8/31
Drizzle
60%
17°
28°
Tue
9/1
Drizzle
60%
16°
28°
Wed
9/2
Drizzle
60%
16°
28°
Thu
9/3
Drizzle
60%
16°
28°
49
Good
U.S. Air Quality Index · Dominant: PM2.5
50 100 150 200

Air quality is satisfactory and poses little or no health risk.

Pollutant Breakdown · Today
PM2.5
Fine particulate matter
Dominant
49 AQI 8.9 µg/m³
O3
Ground-level ozone
36 AQI 39 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Fri 49 Good 36 49
Sat 34 Good 32 34
Sun 38 Good 38 24
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 Thu Aug 20, 15:00'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
SBCAPE224 J/kg
MLCAPE32 J/kg
MUCAPE224 J/kg
SBCIN0 J/kg
MLCIN0 J/kg
Lifted Index-0.7
Kinematics
0–6 km Shear38 kt
0–1 km Shear4 kt
Eff. Shear33 kt
0–1 km SRH3
0–3 km SRH85
Eff. SRH85
Storm Motion275° @ 26 kt
0–1 km EHI0.0
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.3
K-Index33.8
Thermo & Levels
PWAT1.78 in
0–3 km LR5.2 °C/km
700–500 LR5.4 °C/km
Total Totals44.2
LCL953 hPa
LFC974 hPa
EL399 hPa
Freezing Lvl12,746 ft