Areal Flood Watch 1:00 AM

Chester County, Pennsylvania, United States

Last updated: 9:13 PM CDT  ·  Refresh
18°C
Feels like 17°
Mostly Clear
▲ 27°  /  ▼ 14°
Wind
10 mph N
Humidity
92%
Dew Point
16°
Pressure
29.47 inHg
Visibility
10 mi
UV Index
0.0
Cloud Cover
13%
Sunrise
6:19 AM
Sunset
7:52 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Chester County is currently mostly clear at 18°C. Dry conditions are expected through the next 24 hours. Sunrise: 6:19AM · Sunset: 7:52PM.

Alerts

Areal Flood Watch
Expires 1:00 AM
40 AQI · Good Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
18°
3%
11 PM
17°
21%
12 AM
17°
21%
1 AM
17°
14%
2 AM
17°
3%
3 AM
16°
3%
4 AM
16°
3%
5 AM
16°
3%
6 AM
14°
3%
7 AM
14°
3%
8 AM
16°
3%
9 AM
17°
3%
10 AM
18°
5%
11 AM
20°
5%
12 PM
21°
5%
1 PM
22°
5%
2 PM
24°
5%
3 PM
25°
5%
4 PM
25°
5%
5 PM
26°
11%
6 PM
24°
11%
7 PM
23°
11%
8 PM
22°
12%
9 PM
22°
29%
7-Day Forecast
Tonight
27° 14°
Clear.
Fri
26° 14°
Partly Cloudy with a 29% chance of rain.
Sat
23° 18°
Overcast with a 75% chance of rain.
Sun
27° 17°
Rain, 69% chance.
Mon
27° 14°
Clear.
Tue
27° 16°
Rain, 61% chance.
Wed
28° 17°
Drizzle, 71% chance.
TimeTempConditionsPrecipWindHumidity
Now 18° Clear 3% 10 mph N 91%
11 PM 17° Partly Cloudy 21% 9 mph N 92%
12 AM 17° Mostly Clear 21% 9 mph N 93%
1 AM 17° Partly Cloudy 14% 7 mph N 94%
2 AM 17° Partly Cloudy 3% 7 mph N 95%
3 AM 16° Partly Cloudy 3% 6 mph N 95%
4 AM 16° Partly Cloudy 3% 6 mph NNW 95%
5 AM 16° Partly Cloudy 3% 6 mph NNW 94%
6 AM 14° Partly Cloudy 3% 6 mph NNW 92%
7 AM 14° Partly Cloudy 3% 7 mph N 90%
8 AM 16° Partly Cloudy 3% 8 mph N 87%
9 AM 17° Partly Cloudy 3% 8 mph N 80%
10 AM 18° Partly Cloudy 5% 8 mph N 74%
11 AM 20° Partly Cloudy 5% 8 mph N 67%
12 PM 21° Partly Cloudy 5% 7 mph NNE 65%
1 PM 22° Partly Cloudy 5% 6 mph NNE 62%
2 PM 24° Partly Cloudy 5% 5 mph NNE 60%
3 PM 25° Partly Cloudy 5% 4 mph NNE 59%
4 PM 25° Mostly Clear 5% 4 mph NNE 58%
5 PM 26° Mostly Clear 11% 4 mph NNE 58%
6 PM 24° Mostly Clear 11% 3 mph NNE 62%
7 PM 23° Mostly Clear 11% 3 mph NNE 66%
8 PM 22° Mostly Clear 12% 4 mph N 70%
9 PM 22° Partly Cloudy 29% 2 mph NE 74%
15-Day Forecast
Today
8/20
Clear
3%
14°
27°
Fri
8/21
Partly Cloudy
29%
14°
26°
Sat
8/22
Overcast
75%
18°
23°
Sun
8/23
Rain
69%
17°
27°
Mon
8/24
Clear
7%
14°
27°
Tue
8/25
Rain
61%
16°
27°
Wed
8/26
Drizzle
71%
17°
28°
Thu
8/27
Rain
82%
18°
27°
Fri
8/28
Rain
68%
19°
29°
Sat
8/29
Rain
68%
19°
29°
Sun
8/30
Rain
77%
19°
29°
Mon
8/31
Drizzle
60%
18°
28°
Tue
9/1
Drizzle
60%
17°
28°
Wed
9/2
Drizzle
60%
17°
28°
Thu
9/3
Drizzle
60%
17°
27°
40
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
40 AQI 7.2 µg/m³
O3
Ground-level ozone
34 AQI 37 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Today 40 Good 34 40
Sat 42 Good 42 30
Sun 52 Moderate 30 52
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 Fri Aug 21, 01:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 50 60 70 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE0 J/kg
MLCAPE30 J/kg
MUCAPE0 J/kg
SBCIN—
MLCIN0 J/kg
Lifted Index6.3
Kinematics
0–6 km Shear45 kt
0–1 km Shear18 kt
Eff. Shear—
0–1 km SRH-115
0–3 km SRH-21
Eff. SRH—
Storm Motion306° @ 30 kt
0–1 km EHI-0.0
Composite Parameters
Sig. Tornado0.0
STP (eff)—
Supercell—
K-Index33.1
Thermo & Levels
PWAT1.74 in
0–3 km LR3.8 °C/km
700–500 LR5.2 °C/km
Total Totals41.6
LCL976 hPa
LFC—
EL—
Freezing Lvl14,606 ft