Extreme Heat Warning — Pointe Coupee, LA, West Feliciana, LA, East Feliciana, LA, St. Helena, LA, Washington, LA, Iberville, LA, West Baton Rouge, LA, East Baton Rouge, LA, Assumption, LA, St. James, LA, St. John The Baptist, LA, Upper St. Bernard, LA, Lower St. Bernard, LA, Northern Tangipahoa, LA, Southeast St. Tammany, LA, Western Orleans, LA, Eastern Orleans, LA, Northern St. Tammany, LA, Southwestern St. Tammany, LA, Central Tangipahoa, LA, Lower Tangipahoa, LA, Northern Livingston, LA, Southern Livingston, LA, Western Ascension, LA, Eastern Ascension, LA, Upper Jefferson, LA, Upper Plaquemines, LA, Central Plaquemines, LA, Lower Plaquemines, LA, Central Jefferson, LA, Coastal Jefferson, LA, Upper Lafourche, LA, Lower Lafourche, LA, Upper Terrebonne, LA, Lower Terrebonne, LA, Upper St. Charles, LA, Central St. Charles, LA, Lower St. Charles, LA, Wilkinson, MS, Amite, MS, Pike, MS, Walthall, MS, Pearl River, MS, Northern Hancock, MS, Northern Harrison, MS, Northern Jackson, MS, Southern Hancock, MS, Southern Harrison, MS, Southern Jackson, MS 8:00 PM

Tidal Potomac from Cobb Island MD to Smith Point VA, AN

Last updated: 11:34 PM CDT  ·  Refresh
29°C
Feels like 34°
Clear
▲ 36°  /  ▼ 25°
Wind
5 mph SW
Humidity
81%
Dew Point
25°
Pressure
29.95 inHg
Visibility
10 mi
UV Index
0.0
Cloud Cover
0%
Sunrise
6:34 AM
Sunset
7:41 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Tidal Potomac from Cobb Island MD to Smith Point VA is currently clear at 29°C. Precipitation is likely — peak probability 57% around 8 PM. Atmospheric instability is elevated (CAPE up to 3120 J/kg) — isolated convective development possible. Sunrise: 6:34AM · Sunset: 7:41PM.

49 AQI · Good Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
29°
3%
12 AM
29°
14%
1 AM
28°
3%
2 AM
28°
3%
3 AM
28°
3%
4 AM
27°
3%
5 AM
25°
3%
6 AM
25°
3%
7 AM
26°
7%
8 AM
27°
15%
9 AM
29°
18%
10 AM
31°
30%
11 AM
32°
36%
12 PM
34°
36%
1 PM
37°
40%
2 PM
37°
44%
3 PM
36°
56%
4 PM
36°
55%
5 PM
36°
55%
6 PM
34°
56%
7 PM
33°
56%
8 PM
33°
57%
9 PM
32°
36%
10 PM
30°
38%
7-Day Forecast
Tonight
36° 25°
Clear.
Fri
38° 25°
Mostly Clear with a 55% chance of rain.
Sat
40° 24°
Mostly Clear.
Sun
39° 25°
Partly Cloudy with a 72% chance of rain.
Mon
38° 25°
Rain, 64% chance.
Tue
38° 24°
Rain, 70% chance.
Wed
38° 24°
Rain, 55% chance.
TimeTempConditionsPrecipWindHumidity
Now 29° Clear 3% 6 mph SW 80%
12 AM 29° Clear 14% 5 mph WSW 85%
1 AM 28° Clear 3% 4 mph WSW 87%
2 AM 28° Mostly Clear 3% 5 mph WSW 87%
3 AM 28° Partly Cloudy 3% 5 mph WSW 86%
4 AM 27° Mostly Clear 3% 4 mph WSW 87%
5 AM 25° Mostly Clear 3% 4 mph WSW 89%
6 AM 25° Mostly Clear 3% 4 mph WSW 90%
7 AM 26° Partly Cloudy 7% 4 mph WSW 89%
8 AM 27° Partly Cloudy 15% 6 mph W 80%
9 AM 29° Partly Cloudy 18% 7 mph W 72%
10 AM 31° Mostly Clear 30% 7 mph W 64%
11 AM 32° Mostly Clear 36% 6 mph W 57%
12 PM 34° Clear 36% 6 mph W 50%
1 PM 37° Clear 40% 6 mph W 46%
2 PM 37° Mostly Clear 44% 6 mph W 47%
3 PM 36° Mostly Clear 56% 7 mph W 48%
4 PM 36° Partly Cloudy 55% 7 mph WSW 51%
5 PM 36° Partly Cloudy 55% 6 mph WSW 57%
6 PM 34° Partly Cloudy 56% 6 mph WSW 63%
7 PM 33° Partly Cloudy 56% 7 mph SW 68%
8 PM 33° Partly Cloudy 57% 6 mph SW 70%
9 PM 32° Partly Cloudy 36% 6 mph SW 72%
10 PM 30° Partly Cloudy 38% 6 mph SW 74%
15-Day Forecast
Today
8/20
Clear
3%
25°
36°
Fri
8/21
Mostly Clear
55%
25°
38°
Sat
8/22
Mostly Clear
13%
24°
40°
Sun
8/23
Partly Cloudy
72%
25°
39°
Mon
8/24
Rain
64%
25°
38°
Tue
8/25
Rain
70%
24°
38°
Wed
8/26
Rain
55%
24°
38°
Thu
8/27
Rain
82%
24°
36°
Fri
8/28
Rain
69%
23°
38°
Sat
8/29
Rain
68%
24°
38°
Sun
8/30
Drizzle
60%
24°
39°
Mon
8/31
Drizzle
60%
23°
38°
Tue
9/1
Drizzle
60%
23°
38°
Wed
9/2
Drizzle
60%
23°
37°
Thu
9/3
Drizzle
60%
23°
37°
49
Good
U.S. Air Quality Index · Dominant: PM2.5
50 100 150 200

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

Pollutant Breakdown · Today
PM2.5
Fine particulate matter
Dominant
49 AQI 8.9 µg/m³
O3
Ground-level ozone
31 AQI 34 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Today 49 Good 31 49
Sat 48 Good 38 48
Sun 39 Good 39 37
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 Fri Aug 21, 03:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE2781 J/kg
MLCAPE1927 J/kg
MUCAPE3224 J/kg
SBCIN-132 J/kg
MLCIN-131 J/kg
Lifted Index-5.8
Kinematics
0–6 km Shear12 kt
0–1 km Shear3 kt
Eff. Shear15 kt
0–1 km SRH24
0–3 km SRH54
Eff. SRH54
Storm Motion79° @ 15 kt
0–1 km EHI0.4
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index28.7
Thermo & Levels
PWAT1.71 in
0–3 km LR5.6 °C/km
700–500 LR5.9 °C/km
Total Totals42.9
LCL957 hPa
LFC783 hPa
EL148 hPa
Freezing Lvl16,109 ft