Tornado Watch 8:00 PM Severe Thunderstorm Warning — Mercer County, NJ, Middlesex County, NJ, Monmouth County, NJ, Somerset County, NJ 4:45 PM Areal Flood Watch 1:00 AM

Middlesex County, New Jersey, United States

Last updated: 4:24 PM CDT  ·  Refresh
27°C
Feels like 30°
Overcast
▲ 29°  /  ▼ 21°
Wind
7 mph SSW
Humidity
87%
Dew Point
23°
Pressure
29.59 inHg
Visibility
8 mi
UV Index
2.6
Cloud Cover
92%
Sunrise
5:45 AM
Sunset
8:22 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Middlesex County is currently overcast at 26°C. Precipitation is likely — peak probability 90% around 6 PM. Atmospheric instability is elevated (CAPE up to 1567 J/kg) — isolated convective development possible. Sunrise: 5:45AM · Sunset: 8:22PM.

Alerts

Tornado Watch
Expires 8:00 PM
Severe Thunderstorm Warning
Mercer County, NJ, Middlesex County, NJ, Monmouth County, NJ, Somerset County, NJ
Expires 4:45 PM
Areal Flood Watch
Expires 1:00 AM
77 AQI · Moderate Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
27°
70%
6 PM
24°
90%
7 PM
24°
90%
8 PM
24°
64%
9 PM
24°
66%
10 PM
23°
56%
11 PM
23°
53%
12 AM
23°
51%
1 AM
23°
44%
2 AM
23°
44%
3 AM
23°
45%
4 AM
22°
59%
5 AM
21°
59%
6 AM
21°
46%
7 AM
22°
42%
8 AM
22°
42%
9 AM
24°
42%
10 AM
24°
43%
11 AM
26°
31%
12 PM
27°
20%
1 PM
27°
21%
2 PM
27°
21%
3 PM
27°
21%
4 PM
27°
22%
7-Day Forecast
Today
29° 21°
Overcast with a 70% chance of rain.
Wed
29° 21°
Partly Cloudy with a 59% chance of rain.
Thu
28° 18°
Mostly Clear.
Fri
27° 17°
Partly Cloudy.
Sat
28° 18°
Clear.
Sun
29° 18°
Rain, 81% chance.
Mon
30° 20°
Drizzle, 60% chance.
TimeTempConditionsPrecipWindHumidity
Now 27° Overcast 70% 7 mph SSW 87%
6 PM 24° Overcast 90% 6 mph SSW 91%
7 PM 24° Overcast 90% 8 mph S 92%
8 PM 24° Overcast 64% 8 mph S 93%
9 PM 24° Overcast 66% 7 mph S 95%
10 PM 23° Overcast 56% 7 mph S 96%
11 PM 23° Overcast 53% 7 mph S 96%
12 AM 23° Overcast 51% 8 mph S 96%
1 AM 23° Overcast 44% 10 mph SSW 95%
2 AM 23° Overcast 44% 11 mph SSW 94%
3 AM 23° Mostly Cloudy 45% 11 mph SSW 94%
4 AM 22° Mostly Cloudy 59% 11 mph SSW 94%
5 AM 21° Mostly Cloudy 59% 11 mph SSW 92%
6 AM 21° Mostly Cloudy 46% 10 mph SSW 91%
7 AM 22° Partly Cloudy 42% 10 mph SW 90%
8 AM 22° Partly Cloudy 42% 9 mph SW 88%
9 AM 24° Partly Cloudy 42% 9 mph SW 84%
10 AM 24° Partly Cloudy 43% 9 mph WSW 79%
11 AM 26° Partly Cloudy 31% 10 mph WSW 74%
12 PM 27° Partly Cloudy 20% 10 mph WSW 70%
1 PM 27° Partly Cloudy 21% 9 mph WSW 67%
2 PM 27° Partly Cloudy 21% 9 mph WSW 65%
3 PM 27° Mostly Clear 21% 9 mph WSW 64%
4 PM 27° Mostly Clear 22% 9 mph WSW 63%
15-Day Forecast
Today
7/21
Overcast
70%
21°
29°
Wed
7/22
Partly Cloudy
59%
21°
29°
Thu
7/23
Mostly Clear
13%
18°
28°
Fri
7/24
Partly Cloudy
17%
17°
27°
Sat
7/25
Clear
19%
18°
28°
Sun
7/26
Rain
81%
18°
29°
Mon
7/27
Drizzle
60%
20°
30°
Tue
7/28
Drizzle
60%
20°
29°
Wed
7/29
Drizzle
60%
19°
28°
Thu
7/30
Drizzle
60%
20°
29°
Fri
7/31
Drizzle
60%
20°
29°
Sat
8/1
Drizzle
60%
21°
28°
Sun
8/2
Drizzle
60%
21°
30°
Mon
8/3
Drizzle
60%
22°
29°
Tue
8/4
Drizzle
60%
22°
30°
77
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
77 AQI 22.8 µg/m³
O3
Ground-level ozone
36 AQI 39 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Wed 77 Moderate 36 77
Thu 40 Good 39 40
Fri 51 Moderate 39 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 LCLLFCEL0°C Temperature (°C) Pressure (hPa)
Temp Dewpoint Parcel (SB) CAPE CIN Dry adiabat Moist adiabat Mixing ratio
RAP
Valid Tue Jul 21, 20:00'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
SBCAPE2029 J/kg
MLCAPE1705 J/kg
MUCAPE2103 J/kg
SBCIN0 J/kg
MLCIN0 J/kg
Lifted Index-5.7
Kinematics
0–6 km Shear37 kt
0–1 km Shear16 kt
Eff. Shear36 kt
0–1 km SRH-25
0–3 km SRH-76
Eff. SRH-76
Storm Motion208° @ 35 kt
0–1 km EHI-0.3
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index30.6
Thermo & Levels
PWAT2.11 in
0–3 km LR6.0 °C/km
700–500 LR5.6 °C/km
Total Totals45.1
LCL958 hPa
LFC1002 hPa
EL174 hPa
Freezing Lvl13,999 ft