Severe Thunderstorm Watch 9:00 PM

Philadelphia County, Pennsylvania, United States

Last updated: 7:35 PM CDT  ·  Refresh
23°C
Feels like 24°
Rain
▲ 29°  /  ▼ 22°
Wind
8 mph S
Humidity
93%
Dew Point
22°
Pressure
29.57 inHg
Visibility
9 mi
UV Index
0.0
Cloud Cover
81%
Sunrise
5:49 AM
Sunset
8:24 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Philadelphia County is currently rain at 23°C. Precipitation is likely — peak probability 74% around 9 PM. Atmospheric instability is elevated (CAPE up to 1119 J/kg) — isolated convective development possible. Sunrise: 5:49AM · Sunset: 8:24PM.

Alerts

Severe Thunderstorm Watch
Expires 9:00 PM
79 AQI · Moderate Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
23°
72%
9 PM
24°
73%
10 PM
24°
62%
11 PM
23°
61%
12 AM
23°
65%
1 AM
23°
46%
2 AM
23°
45%
3 AM
22°
45%
4 AM
22°
50%
5 AM
22°
47%
6 AM
22°
36%
7 AM
22°
36%
8 AM
23°
29%
9 AM
25°
34%
10 AM
26°
25%
11 AM
27°
23%
12 PM
27°
23%
1 PM
27°
21%
2 PM
27°
24%
3 PM
28°
27%
4 PM
28°
30%
5 PM
28°
30%
6 PM
28°
28%
7 PM
27°
28%
7-Day Forecast
Tonight
29° 22°
Rain, 72% chance.
Wed
29° 21°
Partly Cloudy with a 47% chance of rain.
Thu
29° 19°
Mostly Clear.
Fri
28° 18°
Partly Cloudy.
Sat
29° 18°
Partly Cloudy.
Sun
30° 19°
Drizzle, 62% chance.
Mon
31° 21°
Drizzle, 64% chance.
TimeTempConditionsPrecipWindHumidity
Now 23° Rain 72% 9 mph S 92%
9 PM 24° Rain 73% 8 mph SSW 92%
10 PM 24° Heavy Rain 62% 7 mph SW 92%
11 PM 23° Mostly Cloudy 61% 8 mph SW 93%
12 AM 23° Overcast 65% 9 mph SSW 93%
1 AM 23° Overcast 46% 9 mph SSW 92%
2 AM 23° Overcast 45% 9 mph SSW 92%
3 AM 22° Mostly Cloudy 45% 8 mph SSW 91%
4 AM 22° Mostly Cloudy 50% 8 mph SSW 91%
5 AM 22° Rain 47% 8 mph SW 90%
6 AM 22° Rain 36% 8 mph SW 88%
7 AM 22° Partly Cloudy 36% 8 mph SW 85%
8 AM 23° Rain 29% 9 mph SW 81%
9 AM 25° Partly Cloudy 34% 9 mph WSW 74%
10 AM 26° Partly Cloudy 25% 10 mph W 68%
11 AM 27° Partly Cloudy 23% 10 mph W 64%
12 PM 27° Partly Cloudy 23% 10 mph W 62%
1 PM 27° Partly Cloudy 21% 10 mph W 60%
2 PM 27° Partly Cloudy 24% 10 mph W 57%
3 PM 28° Partly Cloudy 27% 9 mph W 55%
4 PM 28° Mostly Clear 30% 8 mph W 53%
5 PM 28° Mostly Clear 30% 8 mph W 53%
6 PM 28° Mostly Clear 28% 7 mph W 55%
7 PM 27° Mostly Clear 28% 6 mph W 57%
15-Day Forecast
Today
7/21
Rain
72%
22°
29°
Wed
7/22
Partly Cloudy
47%
21°
29°
Thu
7/23
Mostly Clear
3%
19°
29°
Fri
7/24
Partly Cloudy
13%
18°
28°
Sat
7/25
Partly Cloudy
7%
18°
29°
Sun
7/26
Drizzle
62%
19°
30°
Mon
7/27
Drizzle
64%
21°
31°
Tue
7/28
Drizzle
66%
21°
30°
Wed
7/29
Drizzle
54%
21°
29°
Thu
7/30
Drizzle
54%
20°
29°
Fri
7/31
Drizzle
60%
20°
31°
Sat
8/1
Drizzle
60%
22°
29°
Sun
8/2
Drizzle
60%
21°
31°
Mon
8/3
Drizzle
60%
22°
30°
Tue
8/4
Drizzle
60%
22°
31°
79
Moderate
U.S. Air Quality Index · Dominant: PM2.5
50 100 150 200

Air quality is acceptable. Unusually sensitive people should consider limiting prolonged outdoor exertion.

Pollutant Breakdown · Today
PM2.5
Fine particulate matter
Dominant
79 AQI 24.3 µg/m³
O3
Ground-level ozone
39 AQI 43 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Today 79 Moderate 39 79
Thu 56 Moderate 44 56
Fri 54 Moderate 48 54
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 Tue Jul 21, 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
SBCAPE366 J/kg
MLCAPE783 J/kg
MUCAPE1243 J/kg
SBCIN-243 J/kg
MLCIN0 J/kg
Lifted Index-2.7
Kinematics
0–6 km Shear37 kt
0–1 km Shear28 kt
Eff. Shear38 kt
0–1 km SRH180
0–3 km SRH177
Eff. SRH177
Storm Motion224° @ 36 kt
0–1 km EHI0.4
Composite Parameters
Sig. Tornado0.5
STP (eff)0.0
Supercell4.3
K-Index33.8
Thermo & Levels
PWAT2.08 in
0–3 km LR4.3 °C/km
700–500 LR6.4 °C/km
Total Totals49.7
LCL984 hPa
LFC685 hPa
EL279 hPa
Freezing Lvl14,183 ft