Flash Flood Warning — Allegheny County, PA, Fayette County, PA, Greene County, PA, Washington County, PA, Westmoreland County, PA 12:00 PM Flash Flood Warning — Armstrong County, PA, Fayette County, PA, Indiana County, PA, Westmoreland County, PA 1:15 PM

Fayette County, Pennsylvania, United States

Last updated: 11:55 AM CDT  ·  Refresh
21°C
Feels like 23°
Overcast
▲ 24°  /  ▼ 13°
Wind
6 mph SW
Humidity
93%
Dew Point
20°
Pressure
28.58 inHg
Visibility
6 mi
UV Index
3.3
Cloud Cover
95%
Sunrise
6:35 AM
Sunset
8:08 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Fayette County is currently overcast at 21°C. Precipitation is likely — peak probability 71% around 1 PM. Atmospheric instability is elevated (CAPE up to 506 J/kg) — isolated convective development possible. Sunrise: 6:35AM · Sunset: 8:08PM.

Alerts

Flash Flood Warning
Allegheny County, PA, Fayette County, PA, Greene County, PA, Washington County, PA, Westmoreland County, PA
Expires 12:00 PM
Flash Flood Warning
Armstrong County, PA, Fayette County, PA, Indiana County, PA, Westmoreland County, PA
Expires 1:15 PM
38 AQI · Good Dominant: O3 Air Quality
Hourly Forecast · Next 24 Hours
Now
21°
62%
1 PM
22°
70%
2 PM
22°
64%
3 PM
22°
65%
4 PM
23°
65%
5 PM
22°
58%
6 PM
22°
44%
7 PM
21°
19%
8 PM
20°
16%
9 PM
18°
16%
10 PM
18°
16%
11 PM
17°
6%
12 AM
17°
15%
1 AM
16°
15%
2 AM
16°
18%
3 AM
15°
18%
4 AM
14°
18%
5 AM
15°
31%
6 AM
15°
31%
7 AM
16°
32%
8 AM
16°
32%
9 AM
18°
32%
10 AM
19°
33%
11 AM
20°
36%
7-Day Forecast
Today
24° 13°
Overcast with a 65% chance of rain.
Fri
26° 13°
Fog with a 31% chance of rain.
Sat
27° 17°
Partly Cloudy with a 56% chance of rain.
Sun
22° 13°
Mostly Cloudy with a 64% chance of rain.
Mon
23° 11°
Drizzle, 42% chance.
Tue
26° 12°
Clear.
Wed
26° 14°
Clear.
TimeTempConditionsPrecipWindHumidity
Now 21° Overcast 62% 6 mph SW 93%
1 PM 22° Overcast 70% 6 mph WNW 94%
2 PM 22° Rain 64% 5 mph WNW 93%
3 PM 22° Overcast 65% 4 mph NW 90%
4 PM 23° Overcast 65% 6 mph NW 87%
5 PM 22° Mostly Cloudy 58% 5 mph N 90%
6 PM 22° Mostly Cloudy 44% 5 mph N 92%
7 PM 21° Partly Cloudy 19% 5 mph NNE 94%
8 PM 20° Mostly Clear 16% 5 mph NNE 94%
9 PM 18° Mostly Clear 16% 4 mph NE 94%
10 PM 18° Mostly Clear 16% 4 mph NE 93%
11 PM 17° Mostly Clear 6% 4 mph ENE 93%
12 AM 17° Partly Cloudy 15% 4 mph E 93%
1 AM 16° Fog 15% 5 mph E 93%
2 AM 16° Fog 18% 5 mph E 92%
3 AM 15° Fog 18% 5 mph E 92%
4 AM 14° Fog 18% 5 mph E 92%
5 AM 15° Fog 31% 5 mph E 91%
6 AM 15° Fog 31% 5 mph E 90%
7 AM 16° Fog 32% 4 mph E 90%
8 AM 16° Fog 32% 5 mph E 87%
9 AM 18° Fog 32% 5 mph E 84%
10 AM 19° Fog 33% 5 mph E 81%
11 AM 20° Partly Cloudy 36% 5 mph E 79%
15-Day Forecast
Today
8/20
Overcast
65%
13°
24°
Fri
8/21
Fog
31%
13°
26°
Sat
8/22
Partly Cloudy
56%
17°
27°
Sun
8/23
Mostly Cloudy
64%
13°
22°
Mon
8/24
Drizzle
42%
11°
23°
Tue
8/25
Clear
8%
12°
26°
Wed
8/26
Clear
17%
14°
26°
Thu
8/27
Drizzle
42%
15°
25°
Fri
8/28
Drizzle
44%
14°
27°
Sat
8/29
Drizzle
51%
16°
28°
Sun
8/30
Drizzle
60%
17°
27°
Mon
8/31
Drizzle
60%
16°
26°
Tue
9/1
Drizzle
60%
15°
26°
Wed
9/2
Drizzle
60%
14°
26°
Thu
9/3
Drizzle
60%
14°
27°
38
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
38 AQI 6.9 µg/m³
O3
Ground-level ozone
Dominant
38 AQI 42 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Fri 38 Good 38 38
Sat 33 Good 33 24
Sun 39 Good 39 29
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
SBCAPE407 J/kg
MLCAPE119 J/kg
MUCAPE407 J/kg
SBCIN0 J/kg
MLCIN-3 J/kg
Lifted Index-1.8
Kinematics
0–6 km Shear39 kt
0–1 km Shear10 kt
Eff. Shear37 kt
0–1 km SRH33
0–3 km SRH113
Eff. SRH113
Storm Motion267° @ 30 kt
0–1 km EHI0.1
Composite Parameters
Sig. Tornado0.1
STP (eff)0.1
Supercell0.9
K-Index33.1
Thermo & Levels
PWAT1.85 in
0–3 km LR5.5 °C/km
700–500 LR5.3 °C/km
Total Totals42.5
LCL944 hPa
LFC968 hPa
EL375 hPa
Freezing Lvl12,858 ft