Areal Flood Watch 1:00 AM

Downingtown, Pennsylvania

Last updated: 9:05 PM CDT  ·  Refresh
18°C
Feels like 17°
Mostly Clear
▲ 24°  /  ▼ 15°
Wind
10 mph N
Humidity
91%
Dew Point
16°
Pressure
29.55 inHg
Visibility
10 mi
UV Index
0.0
Cloud Cover
14%
Sunrise
6:19 AM
Sunset
7:52 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Downingtown 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
18°
21%
12 AM
17°
21%
1 AM
17°
14%
2 AM
17°
3%
3 AM
16°
3%
4 AM
16°
3%
5 AM
15°
3%
6 AM
15°
3%
7 AM
15°
3%
8 AM
16°
3%
9 AM
18°
3%
10 AM
19°
5%
11 AM
21°
5%
12 PM
22°
5%
1 PM
24°
5%
2 PM
24°
5%
3 PM
25°
5%
4 PM
25°
5%
5 PM
25°
5%
6 PM
24°
5%
7 PM
23°
5%
8 PM
23°
5%
9 PM
21°
29%
7-Day Forecast
Tonight
24° 15°
Mostly Clear.
Fri
26° 15°
Partly Cloudy with a 29% chance of rain.
Sat
24° 19°
Overcast with a 75% chance of rain.
Sun
28° 17°
Overcast with a 69% chance of rain.
Mon
27° 15°
Clear.
Tue
27° 16°
Rain, 61% chance.
Wed
29° 17°
Drizzle, 71% chance.
TimeTempConditionsPrecipWindHumidity
Now 18° Mostly Clear 3% 10 mph N 91%
11 PM 18° Partly Cloudy 21% 9 mph N 92%
12 AM 17° Mostly Clear 21% 8 mph N 93%
1 AM 17° Partly Cloudy 14% 7 mph N 93%
2 AM 17° Partly Cloudy 3% 6 mph N 94%
3 AM 16° Partly Cloudy 3% 6 mph NNW 94%
4 AM 16° Partly Cloudy 3% 6 mph NNW 94%
5 AM 15° Partly Cloudy 3% 6 mph NNW 93%
6 AM 15° Partly Cloudy 3% 6 mph NNW 90%
7 AM 15° Partly Cloudy 3% 7 mph NNW 88%
8 AM 16° Partly Cloudy 3% 8 mph N 85%
9 AM 18° Partly Cloudy 3% 8 mph N 78%
10 AM 19° Partly Cloudy 5% 8 mph N 72%
11 AM 21° Mostly Clear 5% 8 mph N 66%
12 PM 22° Partly Cloudy 5% 7 mph NNE 64%
1 PM 24° Partly Cloudy 5% 6 mph NNE 61%
2 PM 24° Partly Cloudy 5% 5 mph NNE 59%
3 PM 25° Partly Cloudy 5% 4 mph NNE 58%
4 PM 25° Mostly Clear 5% 4 mph NNE 57%
5 PM 25° Mostly Clear 5% 4 mph NNE 57%
6 PM 24° Mostly Clear 5% 3 mph NNE 61%
7 PM 23° Mostly Clear 5% 3 mph NNE 65%
8 PM 23° Mostly Clear 5% 3 mph N 70%
9 PM 21° Partly Cloudy 29% 2 mph NE 73%
15-Day Forecast
Today
8/20
Mostly Clear
3%
15°
24°
Fri
8/21
Partly Cloudy
29%
15°
26°
Sat
8/22
Overcast
75%
19°
24°
Sun
8/23
Overcast
69%
17°
28°
Mon
8/24
Clear
7%
15°
27°
Tue
8/25
Rain
61%
16°
27°
Wed
8/26
Drizzle
71%
17°
29°
Thu
8/27
Rain
82%
18°
27°
Fri
8/28
Drizzle
44%
19°
29°
Sat
8/29
Rain
68%
19°
30°
Sun
8/30
Rain
64%
19°
29°
Mon
8/31
Drizzle
60%
18°
29°
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 38 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Today 40 Good 34 40
Sat 44 Good 44 31
Sun 51 Moderate 30 51
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 Thu Aug 20, 23:00'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
MLCAPE16 J/kg
MUCAPE0 J/kg
SBCIN—
MLCIN0 J/kg
Lifted Index6.5
Kinematics
0–6 km Shear39 kt
0–1 km Shear15 kt
Eff. Shear—
0–1 km SRH-113
0–3 km SRH44
Eff. SRH—
Storm Motion299° @ 29 kt
0–1 km EHI-0.0
Composite Parameters
Sig. Tornado0.0
STP (eff)—
Supercell—
K-Index33.7
Thermo & Levels
PWAT1.76 in
0–3 km LR3.5 °C/km
700–500 LR5.4 °C/km
Total Totals43.9
LCL979 hPa
LFC—
EL—
Freezing Lvl15,039 ft