Flash Flood Warning — Dauphin County, PA, Lancaster County, PA, Lebanon County, PA 7:00 AM Heat Advisory — Huntingdon, PA, Mifflin, PA, Juniata, PA, Fulton, PA, Franklin, PA, Perry, PA, Dauphin, PA, Lebanon, PA, Cumberland, PA, Adams, PA, York, PA, Lancaster, PA 7:00 PM Areal Flood Watch 11:00 PM

Lancaster, Pennsylvania

Last updated: 5:35 AM CDT  ·  Refresh
21°C
Feels like 23°
Rain
▲ 30°  /  ▼ 20°
Wind
5 mph WNW
Humidity
97%
Dew Point
20°
Pressure
29.62 inHg
Visibility
10 mi
UV Index
0.0
Cloud Cover
82%
Sunrise
6:34 AM
Sunset
7:33 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Lancaster is currently rain at 21°C. Precipitation is likely — peak probability 60% around 10 PM. Atmospheric instability is elevated (CAPE up to 2634 J/kg) — isolated convective development possible. Sunrise: 6:34AM · Sunset: 7:33PM.

Alerts

Flash Flood Warning
Dauphin County, PA, Lancaster County, PA, Lebanon County, PA
Expires 7:00 AM
Heat Advisory
Huntingdon, PA, Mifflin, PA, Juniata, PA, Fulton, PA, Franklin, PA, Perry, PA, Dauphin, PA, Lebanon, PA, Cumberland, PA, Adams, PA, York, PA, Lancaster, PA
Expires 7:00 PM
Areal Flood Watch
Expires 11:00 PM
54 AQI · Moderate Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
21°
59%
7 AM
21°
47%
8 AM
22°
25%
9 AM
23°
27%
10 AM
24°
28%
11 AM
25°
26%
12 PM
27°
35%
1 PM
29°
35%
2 PM
29°
34%
3 PM
30°
41%
4 PM
30°
41%
5 PM
30°
50%
6 PM
29°
53%
7 PM
27°
54%
8 PM
26°
58%
9 PM
25°
54%
10 PM
24°
60%
11 PM
24°
50%
12 AM
24°
45%
1 AM
23°
37%
2 AM
23°
38%
3 AM
23°
34%
4 AM
23°
34%
5 AM
22°
35%
7-Day Forecast
Today
30° 20°
Rain, 59% chance.
Fri
30° 19°
Partly Cloudy with a 54% chance of rain.
Sat
24° 16°
Mostly Cloudy.
Sun
24° 13°
Mostly Clear.
Mon
26° 14°
Clear.
Tue
27° 13°
Clear with a 22% chance of rain.
Wed
27° 17°
Rain, 41% chance.
TimeTempConditionsPrecipWindHumidity
Now 21° Rain 59% 5 mph WNW 97%
7 AM 21° Rain 47% 4 mph SSW 96%
8 AM 22° Partly Cloudy 25% 5 mph SSW 92%
9 AM 23° Partly Cloudy 27% 6 mph SW 87%
10 AM 24° Partly Cloudy 28% 6 mph SW 83%
11 AM 25° Mostly Cloudy 26% 7 mph WSW 78%
12 PM 27° Partly Cloudy 35% 7 mph WSW 74%
1 PM 29° Mostly Clear 35% 8 mph W 68%
2 PM 29° Mostly Clear 34% 8 mph W 67%
3 PM 30° Partly Cloudy 41% 7 mph W 68%
4 PM 30° Mostly Cloudy 41% 6 mph WNW 70%
5 PM 30° Partly Cloudy 50% 5 mph WNW 72%
6 PM 29° Partly Cloudy 53% 4 mph W 75%
7 PM 27° Partly Cloudy 54% 4 mph SW 78%
8 PM 26° Partly Cloudy 58% 4 mph SSW 81%
9 PM 25° Mostly Cloudy 54% 5 mph S 84%
10 PM 24° Overcast 60% 5 mph S 87%
11 PM 24° Overcast 50% 5 mph S 90%
12 AM 24° Overcast 45% 5 mph SSW 92%
1 AM 23° Overcast 37% 5 mph WSW 94%
2 AM 23° Overcast 38% 6 mph W 94%
3 AM 23° Drizzle 34% 7 mph W 93%
4 AM 23° Drizzle 34% 8 mph WNW 93%
5 AM 22° Drizzle 35% 8 mph WNW 93%
15-Day Forecast
Today
9/3
Rain
59%
20°
30°
Fri
9/4
Partly Cloudy
54%
19°
30°
Sat
9/5
Mostly Cloudy
17%
16°
24°
Sun
9/6
Mostly Clear
15%
13°
24°
Mon
9/7
Clear
8%
14°
26°
Tue
9/8
Clear
22%
13°
27°
Wed
9/9
Rain
41%
17°
27°
Thu
9/10
Rain
64%
16°
31°
Fri
9/11
Drizzle
44%
12°
26°
Sat
9/12
Drizzle
51%
12°
24°
Sun
9/13
Drizzle
60%
17°
28°
Mon
9/14
Drizzle
60%
16°
28°
Tue
9/15
Clear
60%
14°
26°
Wed
9/16
Drizzle
60%
13°
26°
Thu
9/17
Drizzle
60%
14°
26°
54
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
54 AQI 10.9 µg/m³
O3
Ground-level ozone
37 AQI 41 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Today 54 Moderate 37 54
Fri 46 Good 44 46
Sat 44 Good 37 44
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 Thu Sep 3, 09:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 50 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE44 J/kg
MLCAPE42 J/kg
MUCAPE385 J/kg
SBCIN-189 J/kg
MLCIN-189 J/kg
Lifted Index-0.1
Kinematics
0–6 km Shear41 kt
0–1 km Shear13 kt
Eff. Shear31 kt
0–1 km SRH51
0–3 km SRH88
Eff. SRH67
Storm Motion304° @ 33 kt
0–1 km EHI0.0
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.4
K-Index37.2
Thermo & Levels
PWAT2.08 in
0–3 km LR4.1 °C/km
700–500 LR6.1 °C/km
Total Totals48.0
LCL994 hPa
LFC627 hPa
EL494 hPa
Freezing Lvl14,003 ft