Tornado Watch 8:00 PM Tornado Watch 8:00 PM

Lancaster County, Pennsylvania, United States

Last updated: 7:58 PM CDT  ·  Refresh
23°C
Feels like 25°
Mostly Cloudy
▲ 28°  /  ▼ 19°
Wind
8 mph SSW
Humidity
92%
Dew Point
21°
Pressure
29.29 inHg
Visibility
10 mi
UV Index
0.0
Cloud Cover
84%
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 mostly cloudy at 23°C. Dry conditions are expected through the next 24 hours. Atmospheric instability is elevated (CAPE up to 769 J/kg) — isolated convective development possible. Sunrise: 5:53AM · Sunset: 8:28PM.

Alerts

Tornado Watch
Expires 8:00 PM
Tornado Watch
Expires 8:00 PM
74 AQI · Moderate Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
23°
44%
9 PM
23°
46%
10 PM
23°
39%
11 PM
22°
37%
12 AM
22°
41%
1 AM
21°
42%
2 AM
21°
24%
3 AM
21°
20%
4 AM
21°
12%
5 AM
21°
16%
6 AM
21°
19%
7 AM
22°
8%
8 AM
23°
13%
9 AM
24°
14%
10 AM
25°
21%
11 AM
26°
10%
12 PM
27°
20%
1 PM
27°
20%
2 PM
27°
30%
3 PM
28°
11%
4 PM
28°
9%
5 PM
27°
9%
6 PM
26°
9%
7 PM
25°
3%
7-Day Forecast
Tonight
28° 19°
Mostly Cloudy with a 44% chance of rain.
Wed
28° 15°
Mostly Clear with a 30% chance of rain.
Thu
28° 13°
Clear.
Fri
27° 14°
Partly Cloudy.
Sat
28° 14°
Mostly Cloudy.
Sun
29° 16°
Drizzle, 70% chance.
Mon
31° 18°
Rain, 63% chance.
TimeTempConditionsPrecipWindHumidity
Now 23° Mostly Cloudy 44% 8 mph SSW 92%
9 PM 23° Mostly Cloudy 46% 5 mph S 91%
10 PM 23° Partly Cloudy 39% 7 mph SSW 91%
11 PM 22° Partly Cloudy 37% 6 mph SSW 92%
12 AM 22° Partly Cloudy 41% 7 mph SSW 93%
1 AM 21° Partly Cloudy 42% 8 mph SW 93%
2 AM 21° Mostly Cloudy 24% 6 mph SW 93%
3 AM 21° Mostly Cloudy 20% 5 mph SSW 94%
4 AM 21° Mostly Cloudy 12% 7 mph SSW 94%
5 AM 21° Partly Cloudy 16% 6 mph SW 92%
6 AM 21° Mostly Clear 19% 6 mph WSW 90%
7 AM 22° Mostly Clear 8% 8 mph WSW 87%
8 AM 23° Mostly Clear 13% 9 mph W 81%
9 AM 24° Partly Cloudy 14% 10 mph W 75%
10 AM 25° Mostly Clear 21% 12 mph WNW 69%
11 AM 26° Mostly Clear 10% 12 mph WNW 65%
12 PM 27° Mostly Clear 20% 12 mph WNW 62%
1 PM 27° Mostly Clear 20% 12 mph WNW 59%
2 PM 27° Mostly Clear 30% 12 mph WNW 58%
3 PM 28° Mostly Clear 11% 12 mph WNW 57%
4 PM 28° Mostly Clear 9% 12 mph W 56%
5 PM 27° Mostly Clear 9% 11 mph WNW 58%
6 PM 26° Mostly Clear 9% 10 mph WNW 61%
7 PM 25° Clear 3% 9 mph WNW 64%
15-Day Forecast
Today
7/21
Mostly Cloudy
44%
19°
28°
Wed
7/22
Mostly Clear
30%
15°
28°
Thu
7/23
Clear
3%
13°
28°
Fri
7/24
Partly Cloudy
3%
14°
27°
Sat
7/25
Mostly Cloudy
16%
14°
28°
Sun
7/26
Drizzle
70%
16°
29°
Mon
7/27
Rain
63%
18°
31°
Tue
7/28
Rain
63%
17°
29°
Wed
7/29
Drizzle
69%
16°
30°
Thu
7/30
Drizzle
44%
16°
29°
Fri
7/31
Clear
60%
15°
29°
Sat
8/1
Drizzle
60%
17°
28°
Sun
8/2
Drizzle
60%
17°
30°
Mon
8/3
Drizzle
60%
18°
29°
Tue
8/4
Drizzle
90%
18°
30°
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 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE374 J/kg
MLCAPE817 J/kg
MUCAPE1099 J/kg
SBCIN-235 J/kg
MLCIN0 J/kg
Lifted Index-2.5
Kinematics
0–6 km Shear49 kt
0–1 km Shear29 kt
Eff. Shear49 kt
0–1 km SRH159
0–3 km SRH94
Eff. SRH94
Storm Motion232° @ 43 kt
0–1 km EHI0.4
Composite Parameters
Sig. Tornado0.6
STP (eff)0.0
Supercell2.6
K-Index32.6
Thermo & Levels
PWAT1.99 in
0–3 km LR4.4 °C/km
700–500 LR6.6 °C/km
Total Totals49.1
LCL964 hPa
LFC677 hPa
EL297 hPa
Freezing Lvl14,108 ft