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 County, Pennsylvania, United States

Last updated: 5:41 AM CDT  ·  Refresh
21°C
Feels like 23°
Mostly Cloudy
▲ 30°  /  ▼ 20°
Wind
4 mph W
Humidity
97%
Dew Point
20°
Pressure
29,62 inHg
Visibility
10 mi
UV Index
0,0
Cloud Cover
80%
Sunrise
6:34 AM
Sunset
7:33 PM
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WeatherAI™ Analysis

WeatherAI Analysis: Lancaster County is currently mostly cloudy at 21°C. Precipitation is likely — peak probability 63% around 8 PM. Atmospheric instability is elevated (CAPE up to 2624 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
55 AQI · Moderate Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
21°
59%
7 AM
21°
44%
8 AM
22°
27%
9 AM
23°
29%
10 AM
24°
28%
11 AM
25°
26%
12 PM
27°
35%
1 PM
29°
29%
2 PM
29°
29%
3 PM
30°
41%
4 PM
30°
41%
5 PM
30°
50%
6 PM
28°
53%
7 PM
27°
54%
8 PM
26°
63%
9 PM
25°
59%
10 PM
24°
60%
11 PM
24°
50%
12 AM
24°
50%
1 AM
23°
37%
2 AM
23°
37%
3 AM
23°
38%
4 AM
23°
34%
5 AM
22°
35%
7-Day Forecast
Today
30° 20°
Partly Cloudy with a 59% chance of rain.
Fri
30° 19°
Partly Cloudy with a 50% chance of rain.
Sat
24° 15°
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° Mostly Cloudy 59% 4 mph W 97%
7 AM 21° Rain 44% 4 mph S 96%
8 AM 22° Partly Cloudy 27% 5 mph SSW 92%
9 AM 23° Partly Cloudy 29% 6 mph SW 88%
10 AM 24° Mostly Cloudy 28% 6 mph SW 83%
11 AM 25° Mostly Cloudy 26% 7 mph WSW 79%
12 PM 27° Partly Cloudy 35% 7 mph WSW 74%
1 PM 29° Mostly Clear 29% 8 mph W 70%
2 PM 29° Mostly Clear 29% 8 mph W 69%
3 PM 30° Partly Cloudy 41% 7 mph W 69%
4 PM 30° Partly Cloudy 41% 6 mph W 70%
5 PM 30° Partly Cloudy 50% 5 mph W 73%
6 PM 28° Partly Cloudy 53% 3 mph W 76%
7 PM 27° Partly Cloudy 54% 4 mph SW 78%
8 PM 26° Partly Cloudy 63% 5 mph SSW 82%
9 PM 25° Mostly Cloudy 59% 6 mph S 85%
10 PM 24° Overcast 60% 6 mph S 88%
11 PM 24° Overcast 50% 6 mph S 90%
12 AM 24° Overcast 50% 6 mph SSW 93%
1 AM 23° Overcast 37% 6 mph WSW 94%
2 AM 23° Drizzle 37% 6 mph W 94%
3 AM 23° Drizzle 38% 7 mph W 94%
4 AM 23° Drizzle 34% 8 mph WNW 93%
5 AM 22° Drizzle 35% 8 mph WNW 93%
15-Day Forecast
Today
9/3
Partly Cloudy
59%
20°
30°
Fri
9/4
Partly Cloudy
50%
19°
30°
Sat
9/5
Mostly Cloudy
17%
15°
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
Drizzle
60%
14°
26°
Wed
9/16
Drizzle
60%
13°
25°
Thu
9/17
Drizzle
60%
14°
26°
55
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
55 AQI 11.0 µg/m³
O3
Ground-level ozone
36 AQI 40 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Today 55 Moderate 36 55
Fri 46 Good 44 46
Sat 45 Good 36 45
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 jeu. sept. 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
SBCAPE37 J/kg
MLCAPE49 J/kg
MUCAPE434 J/kg
SBCIN-184 J/kg
MLCIN-166 J/kg
Lifted Index-0.1
Kinematics
0–6 km Shear40 kt
0–1 km Shear14 kt
Eff. Shear29 kt
0–1 km SRH55
0–3 km SRH103
Eff. SRH73
Storm Motion302° @ 32 kt
0–1 km EHI0.0
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.5
K-Index36.9
Thermo & Levels
PWAT2.08 in
0–3 km LR4.0 °C/km
700–500 LR6.1 °C/km
Total Totals47.9
LCL996 hPa
LFC625 hPa
EL497 hPa
Freezing Lvl14,052 ft