Areal Flood Watch 1:00 AM

Frederick, Maryland

Last updated: 2:20 AM CDT  ·  Refresh
20°C
Feels like 22°
Partly Cloudy
▲ 28°  /  ▼ 16°
Wind
4 mph SSW
Humidity
95%
Dew Point
19°
Pressure
29.31 inHg
Visibility
9 mi
UV Index
0.0
Cloud Cover
58%
Sunrise
6:00 AM
Sunset
8:30 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Frederick is currently partly cloudy at 20°C. Dry conditions are expected through the next 24 hours. Atmospheric instability is elevated (CAPE up to 865 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
20°
17%
4 AM
20°
34%
5 AM
19°
17%
6 AM
19°
19%
7 AM
21°
15%
8 AM
22°
15%
9 AM
23°
16%
10 AM
24°
22%
11 AM
26°
13%
12 PM
26°
8%
1 PM
27°
6%
2 PM
28°
3%
3 PM
28°
3%
4 PM
27°
3%
5 PM
27°
3%
6 PM
26°
3%
7 PM
25°
3%
8 PM
24°
3%
9 PM
23°
3%
10 PM
21°
3%
11 PM
21°
3%
12 AM
20°
3%
1 AM
20°
3%
2 AM
19°
3%
7-Day Forecast
Today
28° 16°
Mostly Clear.
Thu
27° 16°
Clear.
Fri
28° 14°
Partly Cloudy.
Sat
25° 15°
Mostly Clear.
Sun
31° 17°
Drizzle, 90% chance.
Mon
32° 19°
Rain, 70% chance.
Tue
34° 18°
Rain, 63% chance.
TimeTempConditionsPrecipWindHumidity
Now 20° Partly Cloudy 17% 4 mph SSW 95%
4 AM 20° Partly Cloudy 34% 5 mph SSW 95%
5 AM 19° Partly Cloudy 17% 5 mph SSW 95%
6 AM 19° Clear 19% 5 mph SW 94%
7 AM 21° Mostly Clear 15% 6 mph SW 93%
8 AM 22° Mostly Clear 15% 7 mph WSW 88%
9 AM 23° Mostly Clear 16% 8 mph W 80%
10 AM 24° Mostly Clear 22% 10 mph W 72%
11 AM 26° Mostly Clear 13% 11 mph W 65%
12 PM 26° Mostly Clear 8% 11 mph W 61%
1 PM 27° Mostly Clear 6% 11 mph W 57%
2 PM 28° Mostly Clear 3% 11 mph W 54%
3 PM 28° Mostly Clear 3% 11 mph W 55%
4 PM 27° Mostly Clear 3% 11 mph WNW 55%
5 PM 27° Clear 3% 10 mph WNW 56%
6 PM 26° Clear 3% 8 mph WNW 59%
7 PM 25° Clear 3% 7 mph NW 63%
8 PM 24° Clear 3% 7 mph NW 66%
9 PM 23° Mostly Clear 3% 7 mph NNW 66%
10 PM 21° Mostly Clear 3% 7 mph NNW 66%
11 PM 21° Mostly Clear 3% 7 mph N 66%
12 AM 20° Partly Cloudy 3% 7 mph NNW 67%
1 AM 20° Partly Cloudy 3% 7 mph NNW 68%
2 AM 19° Partly Cloudy 3% 7 mph NNW 69%
15-Day Forecast
Today
7/22
Mostly Clear
19%
16°
28°
Thu
7/23
Clear
3%
16°
27°
Fri
7/24
Partly Cloudy
3%
14°
28°
Sat
7/25
Mostly Clear
7%
15°
25°
Sun
7/26
Drizzle
90%
17°
31°
Mon
7/27
Rain
70%
19°
32°
Tue
7/28
Rain
63%
18°
34°
Wed
7/29
Rain
69%
18°
33°
Thu
7/30
Drizzle
44%
17°
30°
Fri
7/31
Drizzle
51%
17°
28°
Sat
8/1
Drizzle
60%
18°
31°
Sun
8/2
Drizzle
60%
18°
31°
Mon
8/3
Drizzle
60%
19°
31°
Tue
8/4
Drizzle
60%
19°
32°
Wed
8/5
Drizzle
60%
19°
32°
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 LCL0°C Temperature (°C) Pressure (hPa)
Temp Dewpoint Parcel (SB) CAPE CIN Dry adiabat Moist adiabat Mixing ratio
RAP
Valid Wed Jul 22, 06:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 50 60 70 80 90 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE0 J/kg
MLCAPE40 J/kg
MUCAPE931 J/kg
SBCIN-5959 J/kg
MLCIN0 J/kg
Lifted Index0.4
Kinematics
0–6 km Shear43 kt
0–1 km Shear26 kt
Eff. Shear20 kt
0–1 km SRH-61
0–3 km SRH-91
Eff. SRH-36
Storm Motion224° @ 33 kt
0–1 km EHI-0.0
Composite Parameters
Sig. Tornado-0.0
STP (eff)0.0
Supercell0.0
K-Index34.7
Thermo & Levels
PWAT1.72 in
0–3 km LR4.0 °C/km
700–500 LR6.2 °C/km
Total Totals49.4
LCL979 hPa
LFC—
EL—
Freezing Lvl14,039 ft