Tornado Watch 8:00 PM Areal Flood Watch 1:00 AM

Mercer County, New Jersey, United States

Last updated: 6:19 PM CDT  ·  Refresh
24°C
Feels like 27°
Rain
▲ 30°  /  ▼ 21°
Wind
8 mph S
Humidity
90%
Dew Point
22°
Pressure
29.59 inHg
Visibility
7 mi
UV Index
1.3
Cloud Cover
90%
Sunrise
5:46 AM
Sunset
8:23 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Mercer County is currently rain at 24°C. Precipitation is likely — peak probability 83% around 7 PM. Atmospheric instability is elevated (CAPE up to 1399 J/kg) — isolated convective development possible. Sunrise: 5:46AM · Sunset: 8:23PM.

Alerts

Tornado Watch
Expires 8:00 PM
Areal Flood Watch
Expires 1:00 AM
72 AQI · Moderate Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
24°
83%
8 PM
24°
62%
9 PM
23°
63%
10 PM
23°
73%
11 PM
23°
71%
12 AM
23°
71%
1 AM
22°
51%
2 AM
22°
51%
3 AM
22°
52%
4 AM
22°
52%
5 AM
21°
53%
6 AM
21°
53%
7 AM
22°
46%
8 AM
22°
47%
9 AM
24°
47%
10 AM
26°
44%
11 AM
27°
25%
12 PM
27°
26%
1 PM
27°
24%
2 PM
28°
24%
3 PM
28°
24%
4 PM
28°
25%
5 PM
28°
25%
6 PM
27°
24%
7-Day Forecast
Tonight
30° 21°
Rain, 83% chance.
Wed
29° 20°
Partly Cloudy with a 52% chance of rain.
Thu
29° 17°
Mostly Clear.
Fri
27° 17°
Fog.
Sat
28° 16°
Partly Cloudy.
Sun
29° 18°
Rain, 71% chance.
Mon
29° 20°
Drizzle, 60% chance.
TimeTempConditionsPrecipWindHumidity
Now 24° Rain 83% 8 mph S 90%
8 PM 24° Overcast 62% 9 mph SSW 90%
9 PM 23° Overcast 63% 8 mph SSW 93%
10 PM 23° Mostly Cloudy 73% 6 mph SSW 93%
11 PM 23° Mostly Cloudy 71% 6 mph SSW 94%
12 AM 23° Overcast 71% 8 mph SSW 95%
1 AM 22° Overcast 51% 9 mph SSW 94%
2 AM 22° Overcast 51% 10 mph SSW 94%
3 AM 22° Overcast 52% 10 mph SW 92%
4 AM 22° Mostly Cloudy 52% 10 mph SSW 91%
5 AM 21° Mostly Cloudy 53% 9 mph SSW 91%
6 AM 21° Mostly Cloudy 53% 9 mph SSW 90%
7 AM 22° Partly Cloudy 46% 9 mph SW 88%
8 AM 22° Partly Cloudy 47% 9 mph SW 85%
9 AM 24° Partly Cloudy 47% 9 mph WSW 80%
10 AM 26° Partly Cloudy 44% 10 mph WSW 75%
11 AM 27° Partly Cloudy 25% 10 mph WSW 69%
12 PM 27° Partly Cloudy 26% 10 mph WSW 64%
1 PM 27° Partly Cloudy 24% 10 mph W 60%
2 PM 28° Partly Cloudy 24% 10 mph W 58%
3 PM 28° Mostly Clear 24% 10 mph W 57%
4 PM 28° Mostly Clear 25% 10 mph W 56%
5 PM 28° Mostly Clear 25% 10 mph W 57%
6 PM 27° Mostly Clear 24% 9 mph W 58%
15-Day Forecast
Today
7/21
Rain
83%
21°
30°
Wed
7/22
Partly Cloudy
52%
20°
29°
Thu
7/23
Mostly Clear
12%
17°
29°
Fri
7/24
Fog
15%
17°
27°
Sat
7/25
Partly Cloudy
8%
16°
28°
Sun
7/26
Rain
71%
18°
29°
Mon
7/27
Drizzle
60%
20°
29°
Tue
7/28
Drizzle
63%
19°
28°
Wed
7/29
Drizzle
68%
18°
27°
Thu
7/30
Drizzle
68%
19°
28°
Fri
7/31
Drizzle
46%
20°
29°
Sat
8/1
Drizzle
60%
20°
28°
Sun
8/2
Drizzle
60%
20°
29°
Mon
8/3
Drizzle
60%
21°
29°
Tue
8/4
Drizzle
60%
21°
30°
72
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
72 AQI 20.4 µg/m³
O3
Ground-level ozone
36 AQI 39 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Wed 72 Moderate 36 72
Thu 38 Good 38 34
Fri 47 Good 44 47
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, 22:00'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
SBCAPE842 J/kg
MLCAPE1337 J/kg
MUCAPE1607 J/kg
SBCIN-113 J/kg
MLCIN0 J/kg
Lifted Index-4.2
Kinematics
0–6 km Shear36 kt
0–1 km Shear15 kt
Eff. Shear36 kt
0–1 km SRH53
0–3 km SRH9
Eff. SRH9
Storm Motion225° @ 36 kt
0–1 km EHI0.3
Composite Parameters
Sig. Tornado0.3
STP (eff)0.0
Supercell0.3
K-Index33.2
Thermo & Levels
PWAT2.10 in
0–3 km LR5.0 °C/km
700–500 LR6.2 °C/km
Total Totals47.9
LCL970 hPa
LFC728 hPa
EL207 hPa
Freezing Lvl13,960 ft