Lancaster County, Pennsylvania, United States

Last updated: 9:11 PM CDT  ·  Refresh
22°C
Feels like 24°
Rain
▲ 28°  /  ▼ 19°
Wind
6 mph SSW
Humidity
91%
Dew Point
21°
Pressure
29.31 inHg
Visibility
10 mi
UV Index
0.0
Cloud Cover
70%
Sunrise
5:53 AM
Sunset
8:28 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Lancaster County is currently rain at 22°C. Precipitation is likely — peak probability 55% around 11 PM. Atmospheric instability is elevated (CAPE up to 907 J/kg) — isolated convective development possible. Sunrise: 5:53AM · Sunset: 8:28PM.

Alerts

No active alerts for this location.
74 AQI · Moderate Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
22°
54%
11 PM
22°
54%
12 AM
22°
54%
1 AM
21°
39%
2 AM
21°
20%
3 AM
21°
22%
4 AM
21°
23%
5 AM
21°
20%
6 AM
21°
24%
7 AM
21°
19%
8 AM
22°
8%
9 AM
24°
13%
10 AM
24°
13%
11 AM
26°
16%
12 PM
26°
29%
1 PM
27°
19%
2 PM
28°
20%
3 PM
27°
20%
4 PM
27°
11%
5 PM
28°
9%
6 PM
27°
9%
7 PM
26°
3%
8 PM
24°
3%
9 PM
21°
3%
7-Day Forecast
Tonight
28° 19°
Rain, 54% chance.
Wed
28° 16°
Mostly Clear with a 39% chance of rain.
Thu
27° 13°
Clear.
Fri
28° 14°
Partly Cloudy.
Sat
28° 14°
Clear.
Sun
29° 16°
Rain, 70% chance.
Mon
31° 18°
Rain, 71% chance.
TimeTempConditionsPrecipWindHumidity
Now 22° Rain 54% 6 mph SSW 91%
11 PM 22° Rain 54% 9 mph SSW 91%
12 AM 22° Partly Cloudy 54% 8 mph SSW 92%
1 AM 21° Partly Cloudy 39% 7 mph SSW 92%
2 AM 21° Partly Cloudy 20% 6 mph SSW 92%
3 AM 21° Mostly Cloudy 22% 6 mph SSW 93%
4 AM 21° Mostly Cloudy 23% 6 mph SSW 93%
5 AM 21° Mostly Cloudy 20% 6 mph SW 94%
6 AM 21° Partly Cloudy 24% 6 mph SW 92%
7 AM 21° Mostly Clear 19% 6 mph WSW 90%
8 AM 22° Mostly Clear 8% 8 mph WSW 86%
9 AM 24° Mostly Clear 13% 9 mph W 81%
10 AM 24° Mostly Clear 13% 10 mph W 75%
11 AM 26° Mostly Clear 16% 12 mph WNW 69%
12 PM 26° Mostly Clear 29% 12 mph WNW 65%
1 PM 27° Mostly Clear 19% 12 mph WNW 62%
2 PM 28° Mostly Clear 20% 12 mph WNW 58%
3 PM 27° Mostly Clear 20% 12 mph W 57%
4 PM 27° Mostly Clear 11% 12 mph W 56%
5 PM 28° Mostly Clear 9% 12 mph W 55%
6 PM 27° Mostly Clear 9% 10 mph WNW 58%
7 PM 26° Mostly Clear 3% 10 mph WNW 60%
8 PM 24° Clear 3% 9 mph WNW 63%
9 PM 21° Clear 3% 8 mph NW 63%
15-Day Forecast
Today
7/21
Rain
54%
19°
28°
Wed
7/22
Mostly Clear
39%
16°
28°
Thu
7/23
Clear
3%
13°
27°
Fri
7/24
Partly Cloudy
3%
14°
28°
Sat
7/25
Clear
8%
14°
28°
Sun
7/26
Rain
70%
16°
29°
Mon
7/27
Rain
71%
18°
31°
Tue
7/28
Thunderstorm
63%
17°
29°
Wed
7/29
Drizzle
69%
16°
30°
Thu
7/30
Drizzle
44%
16°
28°
Fri
7/31
Drizzle
60%
15°
29°
Sat
8/1
Drizzle
60%
17°
29°
Sun
8/2
Drizzle
60%
17°
29°
Mon
8/3
Drizzle
60%
18°
30°
Tue
8/4
Drizzle
60%
19°
31°
74
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
74 AQI 21.4 µg/m³
O3
Ground-level ozone
37 AQI 41 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Today 74 Moderate 37 74
Thu 56 Moderate 40 56
Fri 65 Moderate 43 65
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 Tue Jul 21, 23:00'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
SBCAPE168 J/kg
MLCAPE643 J/kg
MUCAPE881 J/kg
SBCIN-138 J/kg
MLCIN0 J/kg
Lifted Index-1.6
Kinematics
0–6 km Shear49 kt
0–1 km Shear31 kt
Eff. Shear49 kt
0–1 km SRH44
0–3 km SRH29
Eff. SRH29
Storm Motion234° @ 44 kt
0–1 km EHI0.1
Composite Parameters
Sig. Tornado0.1
STP (eff)0.0
Supercell0.7
K-Index38.2
Thermo & Levels
PWAT2.05 in
0–3 km LR4.6 °C/km
700–500 LR6.0 °C/km
Total Totals48.9
LCL968 hPa
LFC665 hPa
EL370 hPa
Freezing Lvl14,551 ft