Areal Flood Watch 1:00 AM

Downingtown, Pennsylvania

Last updated: 10:23 PM CDT  ·  Refresh
18°C
Feels like 18°
Mostly Cloudy
▲ 24°  /  ▼ 15°
Wind
8 mph N
Humidity
92%
Dew Point
16°
Pressure
29.58 inHg
Visibility
10 mi
UV Index
0.0
Cloud Cover
63%
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 cloudy at 18°C. Precipitation is likely — peak probability 52% around 11 PM. 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%
12 AM
18°
21%
1 AM
18°
14%
2 AM
17°
3%
3 AM
17°
3%
4 AM
16°
3%
5 AM
15°
3%
6 AM
15°
3%
7 AM
16°
3%
8 AM
17°
3%
9 AM
18°
3%
10 AM
19°
5%
11 AM
21°
5%
12 PM
22°
5%
1 PM
24°
5%
2 PM
25°
5%
3 PM
26°
5%
4 PM
26°
5%
5 PM
26°
5%
6 PM
24°
5%
7 PM
23°
5%
8 PM
23°
11%
9 PM
22°
26%
10 PM
22°
36%
7-Day Forecast
Tonight
24° 15°
Mostly Cloudy.
Fri
26° 15°
Partly Cloudy with a 52% chance of rain.
Sat
24° 19°
Overcast with a 70% chance of rain.
Sun
27° 17°
Drizzle, 54% chance.
Mon
27° 15°
Clear.
Tue
27° 16°
Rain, 61% chance.
Wed
29° 17°
Drizzle, 71% chance.
TimeTempConditionsPrecipWindHumidity
Now 18° Mostly Cloudy 3% 8 mph N 92%
12 AM 18° Mostly Clear 21% 8 mph N 92%
1 AM 18° Clear 14% 7 mph N 91%
2 AM 17° Clear 3% 7 mph NNW 91%
3 AM 17° Mostly Clear 3% 6 mph NNW 92%
4 AM 16° Partly Cloudy 3% 6 mph NNW 93%
5 AM 15° Partly Cloudy 3% 6 mph NNW 92%
6 AM 15° Partly Cloudy 3% 6 mph NNW 89%
7 AM 16° Mostly Clear 3% 7 mph NNW 86%
8 AM 17° Mostly Clear 3% 8 mph N 82%
9 AM 18° Partly Cloudy 3% 8 mph N 76%
10 AM 19° Partly Cloudy 5% 8 mph N 71%
11 AM 21° Partly Cloudy 5% 7 mph N 66%
12 PM 22° Mostly Clear 5% 6 mph NNE 63%
1 PM 24° Mostly Clear 5% 5 mph NNE 60%
2 PM 25° Mostly Clear 5% 4 mph NNE 58%
3 PM 26° Partly Cloudy 5% 4 mph NNE 57%
4 PM 26° Partly Cloudy 5% 4 mph NNE 57%
5 PM 26° Partly Cloudy 5% 3 mph N 58%
6 PM 24° Partly Cloudy 5% 4 mph N 62%
7 PM 23° Partly Cloudy 5% 4 mph N 65%
8 PM 23° Partly Cloudy 11% 3 mph NNE 68%
9 PM 22° Partly Cloudy 26% 2 mph NE 72%
10 PM 22° Partly Cloudy 36% 3 mph ENE 76%
15-Day Forecast
Today
8/20
Mostly Cloudy
3%
15°
24°
Fri
8/21
Partly Cloudy
52%
15°
26°
Sat
8/22
Overcast
70%
19°
24°
Sun
8/23
Drizzle
54%
17°
27°
Mon
8/24
Clear
3%
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
77%
19°
30°
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 32
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 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
MLCAPE4 J/kg
MUCAPE0 J/kg
SBCIN—
MLCIN0 J/kg
Lifted Index5.9
Kinematics
0–6 km Shear25 kt
0–1 km Shear17 kt
Eff. Shear—
0–1 km SRH-35
0–3 km SRH22
Eff. SRH—
Storm Motion331° @ 27 kt
0–1 km EHI-0.0
Composite Parameters
Sig. Tornado0.0
STP (eff)—
Supercell—
K-Index25.9
Thermo & Levels
PWAT1.47 in
0–3 km LR3.4 °C/km
700–500 LR5.8 °C/km
Total Totals40.0
LCL980 hPa
LFC—
EL—
Freezing Lvl14,744 ft