Severe Thunderstorm Watch 9:00 PM Areal Flood Watch 1:00 AM

Montgomery County, Pennsylvania, United States

Last updated: 8:00 PM CDT  ·  Refresh
23°C
Feels like 26°
Overcast
▲ 29°  /  ▼ 21°
Wind
6 mph S
Humidity
93%
Dew Point
21°
Pressure
29.43 inHg
Visibility
10 mi
UV Index
0.0
Cloud Cover
91%
Sunrise
5:49 AM
Sunset
8:25 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Montgomery County is currently overcast at 23°C. Precipitation is likely — peak probability 64% around 10 PM. Atmospheric instability is elevated (CAPE up to 968 J/kg) — isolated convective development possible. Sunrise: 5:49AM · Sunset: 8:25PM.

Alerts

Severe Thunderstorm Watch
Expires 9:00 PM
Areal Flood Watch
Expires 1:00 AM
82 AQI · Moderate Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
23°
44%
10 PM
23°
64%
11 PM
23°
47%
12 AM
22°
40%
1 AM
22°
57%
2 AM
22°
42%
3 AM
22°
44%
4 AM
21°
40%
5 AM
21°
24%
6 AM
21°
35%
7 AM
21°
21%
8 AM
22°
8%
9 AM
23°
13%
10 AM
26°
25%
11 AM
27°
22%
12 PM
27°
22%
1 PM
26°
20%
2 PM
26°
20%
3 PM
27°
20%
4 PM
28°
21%
5 PM
28°
19%
6 PM
27°
19%
7 PM
26°
19%
8 PM
24°
10%
7-Day Forecast
Tonight
29° 21°
Overcast with a 44% chance of rain.
Wed
28° 19°
Partly Cloudy with a 44% chance of rain.
Thu
28° 16°
Clear.
Fri
27° 16°
Mostly Cloudy.
Sat
28° 16°
Mostly Cloudy.
Sun
29° 17°
Drizzle, 70% chance.
Mon
30° 18°
Drizzle, 71% chance.
TimeTempConditionsPrecipWindHumidity
Now 23° Overcast 44% 6 mph S 93%
10 PM 23° Rain 64% 6 mph SSW 93%
11 PM 23° Rain 47% 6 mph SSW 93%
12 AM 22° Mostly Cloudy 40% 8 mph SSW 94%
1 AM 22° Rain 57% 7 mph SW 93%
2 AM 22° Mostly Cloudy 42% 9 mph SW 94%
3 AM 22° Mostly Cloudy 44% 8 mph SW 93%
4 AM 21° Partly Cloudy 40% 7 mph SSW 93%
5 AM 21° Mostly Cloudy 24% 8 mph SSW 94%
6 AM 21° Mostly Cloudy 35% 7 mph SSW 92%
7 AM 21° Partly Cloudy 21% 8 mph SW 89%
8 AM 22° Partly Cloudy 8% 9 mph WSW 85%
9 AM 23° Partly Cloudy 13% 10 mph WSW 79%
10 AM 26° Partly Cloudy 25% 10 mph W 72%
11 AM 27° Partly Cloudy 22% 11 mph W 66%
12 PM 27° Partly Cloudy 22% 11 mph W 65%
1 PM 26° Partly Cloudy 20% 11 mph W 64%
2 PM 26° Partly Cloudy 20% 10 mph W 63%
3 PM 27° Partly Cloudy 20% 10 mph W 59%
4 PM 28° Partly Cloudy 21% 10 mph W 55%
5 PM 28° Mostly Clear 19% 11 mph W 52%
6 PM 27° Mostly Clear 19% 10 mph W 54%
7 PM 26° Mostly Clear 19% 9 mph W 57%
8 PM 24° Clear 10% 8 mph WNW 60%
15-Day Forecast
Today
7/21
Overcast
44%
21°
29°
Wed
7/22
Partly Cloudy
44%
19°
28°
Thu
7/23
Clear
3%
16°
28°
Fri
7/24
Mostly Cloudy
15%
16°
27°
Sat
7/25
Mostly Cloudy
8%
16°
28°
Sun
7/26
Drizzle
70%
17°
29°
Mon
7/27
Drizzle
71%
18°
30°
Tue
7/28
Rain
63%
19°
29°
Wed
7/29
Rain
68%
18°
29°
Thu
7/30
Drizzle
44%
17°
28°
Fri
7/31
Drizzle
60%
17°
29°
Sat
8/1
Drizzle
60%
19°
28°
Sun
8/2
Drizzle
60%
19°
29°
Mon
8/3
Drizzle
60%
20°
29°
Tue
8/4
Drizzle
60%
20°
30°
82
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
82 AQI 26.0 µg/m³
O3
Ground-level ozone
32 AQI 36 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Today 82 Moderate 32 82
Thu 55 Moderate 34 55
Fri 58 Moderate 37 58
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
SBCAPE378 J/kg
MLCAPE819 J/kg
MUCAPE1272 J/kg
SBCIN-182 J/kg
MLCIN0 J/kg
Lifted Index-2.6
Kinematics
0–6 km Shear42 kt
0–1 km Shear29 kt
Eff. Shear43 kt
0–1 km SRH199
0–3 km SRH201
Eff. SRH201
Storm Motion224° @ 38 kt
0–1 km EHI0.5
Composite Parameters
Sig. Tornado0.7
STP (eff)0.1
Supercell5.6
K-Index36.7
Thermo & Levels
PWAT2.11 in
0–3 km LR4.5 °C/km
700–500 LR6.3 °C/km
Total Totals50.3
LCL972 hPa
LFC685 hPa
EL278 hPa
Freezing Lvl14,206 ft