Areal Flood Watch 5:00 PM

Nantucket, Massachusetts

Last updated: 3:49 PM CDT  ·  Refresh
71°F
Feels like 73°
Fog
▲ 74°  /  ▼ 68°
Wind
10 mph S
Humidity
96%
Dew Point
70°
Pressure
29.81 inHg
Visibility
0 mi
UV Index
1.4
Cloud Cover
99%
Sunrise
6:18 AM
Sunset
6:52 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Nantucket is currently fog at 71°F. Precipitation is likely — peak probability 90% around 4 PM. Sunrise: 6:18AM · Sunset: 6:52PM.

Alerts

Areal Flood Watch
Expires 5:00 PM
35 AQI · Good Dominant: O3 Air Quality
Hourly Forecast · Next 24 Hours
Now
71°
90%
5 PM
70°
50%
6 PM
70°
43%
7 PM
69°
23%
8 PM
69°
3%
9 PM
69°
21%
10 PM
68°
21%
11 PM
68°
10%
12 AM
69°
14%
1 AM
69°
14%
2 AM
69°
27%
3 AM
70°
38%
4 AM
70°
38%
5 AM
70°
52%
6 AM
70°
49%
7 AM
71°
49%
8 AM
71°
49%
9 AM
71°
46%
10 AM
71°
38%
11 AM
71°
38%
12 PM
71°
27%
1 PM
71°
17%
2 PM
71°
17%
3 PM
71°
17%
7-Day Forecast
Today
74° 68°
Fog with a 90% chance of rain.
Mon
72° 66°
Partly Cloudy with a 49% chance of rain.
Tue
70° 62°
Clear.
Wed
68° 62°
Partly Cloudy with a 38% chance of rain.
Thu
71° 64°
Clear with a 60% chance of rain.
Fri
69° 64°
Rain, 71% chance.
Sat
70° 65°
Drizzle, 68% chance.
TimeTempConditionsPrecipWindHumidity
Now 71° Fog 90% 10 mph S 96%
5 PM 70° Overcast 50% 9 mph SSW 95%
6 PM 70° Mostly Cloudy 43% 12 mph SW 94%
7 PM 69° Partly Cloudy 23% 13 mph WSW 94%
8 PM 69° Partly Cloudy 3% 12 mph WSW 95%
9 PM 69° Mostly Cloudy 21% 13 mph W 95%
10 PM 68° Partly Cloudy 21% 14 mph WNW 95%
11 PM 68° Partly Cloudy 10% 13 mph WNW 95%
12 AM 69° Partly Cloudy 14% 12 mph W 95%
1 AM 69° Partly Cloudy 14% 11 mph W 96%
2 AM 69° Partly Cloudy 27% 10 mph WSW 95%
3 AM 70° Mostly Cloudy 38% 10 mph WSW 95%
4 AM 70° Mostly Cloudy 38% 11 mph WSW 95%
5 AM 70° Mostly Cloudy 52% 12 mph WSW 94%
6 AM 70° Mostly Cloudy 49% 13 mph W 92%
7 AM 71° Mostly Cloudy 49% 13 mph WNW 90%
8 AM 71° Mostly Cloudy 49% 13 mph WNW 86%
9 AM 71° Mostly Cloudy 46% 13 mph NW 84%
10 AM 71° Drizzle 38% 14 mph NW 83%
11 AM 71° Mostly Cloudy 38% 14 mph NW 78%
12 PM 71° Partly Cloudy 27% 16 mph NNW 74%
1 PM 71° Partly Cloudy 17% 17 mph NNW 69%
2 PM 71° Mostly Clear 17% 17 mph NNW 67%
3 PM 71° Mostly Clear 17% 17 mph NNW 66%
15-Day Forecast
Today
9/13
Fog
90%
68°
74°
Mon
9/14
Partly Cloudy
49%
66°
72°
Tue
9/15
Clear
3%
62°
70°
Wed
9/16
Partly Cloudy
38%
62°
68°
Thu
9/17
Clear
60%
64°
71°
Fri
9/18
Rain
71%
64°
69°
Sat
9/19
Drizzle
68%
65°
70°
Sun
9/20
Rain
90%
62°
69°
Mon
9/21
Drizzle
60%
60°
65°
Tue
9/22
Drizzle
60%
57°
66°
Wed
9/23
Drizzle
60%
60°
66°
Thu
9/24
Clear
60%
63°
66°
Fri
9/25
Drizzle
60%
63°
66°
Sat
9/26
Drizzle
60%
62°
66°
Sun
9/27
Drizzle
60%
61°
65°
35
Good
U.S. Air Quality Index · Dominant: O3
50 100 150 200

Air quality is satisfactory and poses little or no health risk.

Pollutant Breakdown · Today
PM2.5
Fine particulate matter
13 AQI 2.4 µg/m³
O3
Ground-level ozone
Dominant
35 AQI 39 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Mon 35 Good 35 13
Tue 36 Good 36 18
Wed 23 Good 23 6
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 Sun Sep 13, 19:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 50 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE176 J/kg
MLCAPE453 J/kg
MUCAPE653 J/kg
SBCIN-53 J/kg
MLCIN-10 J/kg
Lifted Index-0.6
Kinematics
0–6 km Shear25 kt
0–1 km Shear19 kt
Eff. Shear18 kt
0–1 km SRH38
0–3 km SRH22
Eff. SRH22
Storm Motion270° @ 21 kt
0–1 km EHI0.0
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index37.1
Thermo & Levels
PWAT2.27 in
0–3 km LR4.9 °C/km
700–500 LR5.1 °C/km
Total Totals45.2
LCL999 hPa
LFC820 hPa
EL437 hPa
Freezing Lvl13,963 ft