Flash Flood Warning — Allegheny County, PA, Fayette County, PA, Greene County, PA, Washington County, PA, Westmoreland County, PA 12:00 PM Flood Warning — Allegheny County, PA, Beaver County, PA, Fayette County, PA, Greene County, PA, Washington County, PA, Westmoreland County, PA, Brooke County, WV, Hancock County, WV 2:45 PM

Allegheny County, Pennsylvania, United States

Last updated: 11:56 AM CDT  ·  Refresh
21°C
Feels like 23°
Fog
▲ 24°  /  ▼ 15°
Wind
5 mph NNW
Humidity
91%
Dew Point
20°
Pressure
29.00 inHg
Visibility
0 mi
UV Index
2.9
Cloud Cover
97%
Sunrise
6:35 AM
Sunset
8:10 PM
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WeatherAI™ Analysis

WeatherAI Analysis: Allegheny County is currently fog at 21°C. Precipitation is likely — peak probability 81% around 12 PM. Sunrise: 6:35AM · 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
Flood Warning
Allegheny County, PA, Beaver County, PA, Fayette County, PA, Greene County, PA, Washington County, PA, Westmoreland County, PA, Brooke County, WV, Hancock County, WV
Expires 2:45 PM
49 AQI · Good Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
21°
80%
1 PM
22°
44%
2 PM
23°
64%
3 PM
23°
65%
4 PM
23°
65%
5 PM
23°
32%
6 PM
22°
24%
7 PM
21°
14%
8 PM
21°
14%
9 PM
19°
14%
10 PM
18°
3%
11 PM
18°
3%
12 AM
17°
7%
1 AM
17°
6%
2 AM
17°
6%
3 AM
17°
16%
4 AM
16°
16%
5 AM
16°
16%
6 AM
16°
16%
7 AM
16°
16%
8 AM
17°
18%
9 AM
18°
13%
10 AM
18°
13%
11 AM
19°
24%
7-Day Forecast
Today
24° 15°
Fog with a 80% chance of rain.
Fri
27° 15°
Mostly Clear with a 26% chance of rain.
Sat
29° 17°
Clear with a 56% chance of rain.
Sun
25° 15°
Mostly Cloudy with a 69% chance of rain.
Mon
26° 13°
Clear.
Tue
28° 14°
Clear.
Wed
26° 16°
Rain, 28% chance.
TimeTempConditionsPrecipWindHumidity
Now 21° Fog 80% 5 mph NNW 91%
1 PM 22° Overcast 44% 4 mph N 86%
2 PM 23° Overcast 64% 5 mph NNE 83%
3 PM 23° Mostly Cloudy 65% 4 mph NNE 81%
4 PM 23° Mostly Cloudy 65% 5 mph NNE 79%
5 PM 23° Mostly Cloudy 32% 6 mph NNE 82%
6 PM 22° Partly Cloudy 24% 5 mph NE 86%
7 PM 21° Clear 14% 5 mph NE 89%
8 PM 21° Mostly Clear 14% 5 mph NE 91%
9 PM 19° Mostly Clear 14% 4 mph ENE 93%
10 PM 18° Mostly Clear 3% 3 mph NE 94%
11 PM 18° Mostly Clear 3% 3 mph NE 94%
12 AM 17° Mostly Clear 7% 3 mph NE 95%
1 AM 17° Fog 6% 3 mph NE 95%
2 AM 17° Fog 6% 3 mph NE 95%
3 AM 17° Fog 16% 3 mph NE 96%
4 AM 16° Fog 16% 3 mph NE 96%
5 AM 16° Fog 16% 3 mph NE 95%
6 AM 16° Fog 16% 4 mph NE 94%
7 AM 16° Fog 16% 4 mph NE 93%
8 AM 17° Fog 18% 4 mph ENE 89%
9 AM 18° Fog 13% 4 mph ENE 84%
10 AM 18° Fog 13% 4 mph ENE 80%
11 AM 19° Mostly Clear 24% 4 mph ENE 75%
15-Day Forecast
Today
8/20
Fog
80%
15°
24°
Fri
8/21
Mostly Clear
26%
15°
27°
Sat
8/22
Clear
56%
17°
29°
Sun
8/23
Mostly Cloudy
69%
15°
25°
Mon
8/24
Clear
8%
13°
26°
Tue
8/25
Clear
8%
14°
28°
Wed
8/26
Rain
28%
16°
26°
Thu
8/27
Rain
69%
17°
28°
Fri
8/28
Rain
68%
17°
28°
Sat
8/29
Drizzle
51%
18°
29°
Sun
8/30
Drizzle
60%
19°
29°
Mon
8/31
Drizzle
60%
18°
29°
Tue
9/1
Drizzle
60%
17°
28°
Wed
9/2
Drizzle
60%
17°
29°
Thu
9/3
Drizzle
60%
17°
29°
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 9.0 µg/m³
O3
Ground-level ozone
40 AQI 44 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Fri 49 Good 40 49
Sat 35 Good 35 33
Sun 42 Good 42 32
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
SBCAPE295 J/kg
MLCAPE22 J/kg
MUCAPE295 J/kg
SBCIN0 J/kg
MLCIN0 J/kg
Lifted Index-1.0
Kinematics
0–6 km Shear39 kt
0–1 km Shear2 kt
Eff. Shear30 kt
0–1 km SRH-18
0–3 km SRH68
Eff. SRH68
Storm Motion275° @ 26 kt
0–1 km EHI-0.0
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.3
K-Index31.5
Thermo & Levels
PWAT1.75 in
0–3 km LR5.3 °C/km
700–500 LR5.4 °C/km
Total Totals43.7
LCL963 hPa
LFC982 hPa
EL394 hPa
Freezing Lvl12,822 ft