Severe Thunderstorm Watch 11:00 PM

Calvert County, Maryland, United States

Last updated: 10:30 PM CDT  ·  Refresh
23°C
Feels like 24°
Rain
▲ 32°  /  ▼ 21°
Wind
12 mph SW
Humidity
94%
Dew Point
22°
Pressure
29.68 inHg
Visibility
5 mi
UV Index
0.0
Cloud Cover
98%
Sunrise
5:58 AM
Sunset
8:25 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Calvert County is currently rain at 23°C. Precipitation is likely — peak probability 90% around 11 PM. Atmospheric instability is elevated (CAPE up to 1608 J/kg) — isolated convective development possible. Sunrise: 5:58AM · Sunset: 8:25PM.

Alerts

Severe Thunderstorm Watch
Expires 11:00 PM
42 AQI · Good Dominant: O3 Air Quality
Hourly Forecast · Next 24 Hours
Now
23°
90%
12 AM
23°
90%
1 AM
23°
84%
2 AM
23°
65%
3 AM
23°
65%
4 AM
23°
61%
5 AM
22°
40%
6 AM
22°
40%
7 AM
23°
28%
8 AM
24°
29%
9 AM
24°
41%
10 AM
26°
48%
11 AM
27°
61%
12 PM
27°
62%
1 PM
29°
62%
2 PM
29°
63%
3 PM
29°
64%
4 PM
28°
64%
5 PM
29°
65%
6 PM
27°
65%
7 PM
27°
61%
8 PM
26°
56%
9 PM
26°
62%
10 PM
25°
54%
7-Day Forecast
Tonight
32° 21°
Rain, 90% chance.
Wed
29° 21°
Mostly Cloudy with a 65% chance of rain.
Thu
27° 20°
Mostly Clear.
Fri
27° 19°
Mostly Cloudy with a 37% chance of rain.
Sat
26° 19°
Overcast with a 27% chance of rain.
Sun
28° 19°
Rain, 70% chance.
Mon
31° 20°
Rain, 64% chance.
TimeTempConditionsPrecipWindHumidity
Now 23° Rain 90% 12 mph SW 94%
12 AM 23° Rain 90% 12 mph SW 94%
1 AM 23° Rain 84% 13 mph SW 93%
2 AM 23° Rain 65% 13 mph SW 92%
3 AM 23° Mostly Cloudy 65% 11 mph SW 94%
4 AM 23° Partly Cloudy 61% 10 mph SW 96%
5 AM 22° Mostly Cloudy 40% 9 mph SW 95%
6 AM 22° Mostly Cloudy 40% 10 mph SW 93%
7 AM 23° Mostly Cloudy 28% 11 mph SW 91%
8 AM 24° Mostly Cloudy 29% 11 mph SW 87%
9 AM 24° Mostly Cloudy 41% 10 mph WSW 82%
10 AM 26° Mostly Cloudy 48% 10 mph WSW 75%
11 AM 27° Rain 61% 9 mph WSW 70%
12 PM 27° Heavy Rain 62% 9 mph WSW 67%
1 PM 29° Heavy Rain 62% 8 mph WSW 63%
2 PM 29° Mostly Cloudy 63% 7 mph WSW 62%
3 PM 29° Mostly Cloudy 64% 6 mph WSW 64%
4 PM 28° Mostly Cloudy 64% 4 mph WSW 66%
5 PM 29° Mostly Cloudy 65% 4 mph SW 71%
6 PM 27° Partly Cloudy 65% 4 mph SW 78%
7 PM 27° Partly Cloudy 61% 4 mph WSW 83%
8 PM 26° Partly Cloudy 56% 4 mph W 84%
9 PM 26° Mostly Cloudy 62% 4 mph W 83%
10 PM 25° Mostly Cloudy 54% 4 mph WNW 82%
15-Day Forecast
Today
7/21
Rain
90%
21°
32°
Wed
7/22
Mostly Cloudy
65%
21°
29°
Thu
7/23
Mostly Clear
16%
20°
27°
Fri
7/24
Mostly Cloudy
37%
19°
27°
Sat
7/25
Overcast
27%
19°
26°
Sun
7/26
Rain
70%
19°
28°
Mon
7/27
Rain
64%
20°
31°
Tue
7/28
Thunderstorm
71%
21°
33°
Wed
7/29
Rain
69%
20°
29°
Thu
7/30
Drizzle
44%
19°
28°
Fri
7/31
Drizzle
60%
19°
29°
Sat
8/1
Drizzle
60%
20°
28°
Sun
8/2
Drizzle
60%
21°
27°
Mon
8/3
Drizzle
60%
21°
29°
Tue
8/4
Drizzle
60%
22°
30°
42
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
19 AQI 3.4 µg/m³
O3
Ground-level ozone
Dominant
42 AQI 46 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Today 42 Good 42 19
Thu 44 Good 44 19
Fri 41 Good 41 21
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 Wed Jul 22, 02:00'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
SBCAPE342 J/kg
MLCAPE454 J/kg
MUCAPE655 J/kg
SBCIN-53 J/kg
MLCIN0 J/kg
Lifted Index-1.3
Kinematics
0–6 km Shear33 kt
0–1 km Shear23 kt
Eff. Shear32 kt
0–1 km SRH-75
0–3 km SRH-86
Eff. SRH-86
Storm Motion228° @ 38 kt
0–1 km EHI-0.2
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index37.2
Thermo & Levels
PWAT2.29 in
0–3 km LR5.0 °C/km
700–500 LR5.0 °C/km
Total Totals45.5
LCL989 hPa
LFC809 hPa
EL330 hPa
Freezing Lvl14,938 ft