Areal Flood Watch 1:00 AM

Frederick, Maryland

Last updated: 1:03 AM CDT  ·  Refresh
21°C
Feels like 22°
Mostly Cloudy
▲ 28°  /  ▼ 15°
Wind
6 mph SSW
Humidity
96%
Dew Point
20°
Pressure
29.33 inHg
Visibility
10 mi
UV Index
0.0
Cloud Cover
62%
Sunrise
6:00 AM
Sunset
8:30 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Frederick is currently mostly cloudy at 20°C. Dry conditions are expected through the next 24 hours. Atmospheric instability is elevated (CAPE up to 968 J/kg) — isolated convective development possible. Sunrise: 6:00AM · Sunset: 8:30PM.

Alerts

Areal Flood Watch
Expires 1:00 AM
51 AQI · Moderate Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
21°
39%
3 AM
21°
28%
4 AM
21°
17%
5 AM
21°
19%
6 AM
19°
24%
7 AM
21°
18%
8 AM
21°
15%
9 AM
23°
19%
10 AM
24°
16%
11 AM
26°
13%
12 PM
26°
8%
1 PM
27°
8%
2 PM
28°
5%
3 PM
28°
5%
4 PM
27°
5%
5 PM
27°
3%
6 PM
27°
3%
7 PM
26°
3%
8 PM
24°
3%
9 PM
23°
3%
10 PM
22°
3%
11 PM
22°
3%
12 AM
21°
3%
1 AM
19°
3%
7-Day Forecast
Today
28° 15°
Mostly Clear with a 39% chance of rain.
Thu
27° 15°
Clear.
Fri
28° 14°
Partly Cloudy.
Sat
27° 16°
Mostly Clear.
Sun
31° 18°
Heavy Rain, 82% chance.
Mon
32° 19°
Rain, 70% chance.
Tue
34° 18°
Rain, 63% chance.
TimeTempConditionsPrecipWindHumidity
Now 21° Mostly Cloudy 39% 6 mph SSW 96%
3 AM 21° Mostly Clear 28% 4 mph SSW 96%
4 AM 21° Partly Cloudy 17% 5 mph SSW 96%
5 AM 21° Mostly Clear 19% 5 mph SSW 96%
6 AM 19° Mostly Clear 24% 5 mph SW 95%
7 AM 21° Mostly Clear 18% 5 mph SW 94%
8 AM 21° Mostly Clear 15% 6 mph WSW 91%
9 AM 23° Mostly Clear 19% 7 mph WSW 84%
10 AM 24° Mostly Clear 16% 8 mph W 76%
11 AM 26° Mostly Clear 13% 10 mph W 67%
12 PM 26° Mostly Clear 8% 11 mph W 64%
1 PM 27° Mostly Clear 8% 11 mph W 59%
2 PM 28° Mostly Clear 5% 11 mph W 55%
3 PM 28° Mostly Clear 5% 11 mph W 54%
4 PM 27° Mostly Clear 5% 11 mph WNW 54%
5 PM 27° Mostly Clear 3% 10 mph WNW 55%
6 PM 27° Clear 3% 9 mph WNW 58%
7 PM 26° Clear 3% 8 mph NW 62%
8 PM 24° Clear 3% 7 mph NW 66%
9 PM 23° Mostly Clear 3% 7 mph NNW 65%
10 PM 22° Mostly Clear 3% 7 mph NNW 65%
11 PM 22° Mostly Clear 3% 7 mph NNW 64%
12 AM 21° Partly Cloudy 3% 7 mph NNW 65%
1 AM 19° Partly Cloudy 3% 6 mph N 66%
15-Day Forecast
Today
7/22
Mostly Clear
39%
15°
28°
Thu
7/23
Clear
3%
15°
27°
Fri
7/24
Partly Cloudy
14%
14°
28°
Sat
7/25
Mostly Clear
8%
16°
27°
Sun
7/26
Heavy Rain
82%
18°
31°
Mon
7/27
Rain
70%
19°
32°
Tue
7/28
Rain
63%
18°
34°
Wed
7/29
Rain
44%
17°
33°
Thu
7/30
Drizzle
44%
16°
29°
Fri
7/31
Drizzle
44%
17°
29°
Sat
8/1
Drizzle
60%
17°
29°
Sun
8/2
Drizzle
60%
17°
30°
Mon
8/3
Drizzle
60%
18°
31°
Tue
8/4
Drizzle
60%
19°
32°
Wed
8/5
Drizzle
60%
19°
31°
51
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
51 AQI 9.2 µg/m³
O3
Ground-level ozone
36 AQI 39 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Today 51 Moderate 36 51
Thu 41 Good 41 16
Fri 39 Good 39 26
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, 04:00'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
SBCAPE0 J/kg
MLCAPE48 J/kg
MUCAPE176 J/kg
SBCIN-294 J/kg
MLCIN0 J/kg
Lifted Index0.4
Kinematics
0–6 km Shear36 kt
0–1 km Shear29 kt
Eff. Shear5 kt
0–1 km SRH-17
0–3 km SRH9
Eff. SRH-4
Storm Motion231° @ 35 kt
0–1 km EHI-0.0
Composite Parameters
Sig. Tornado-0.0
STP (eff)0.0
Supercell0.0
K-Index36.0
Thermo & Levels
PWAT1.77 in
0–3 km LR4.4 °C/km
700–500 LR5.6 °C/km
Total Totals47.3
LCL981 hPa
LFC653 hPa
EL646 hPa
Freezing Lvl14,245 ft