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EF-2 and EF-1 Tornadoes Confirmed in York and Lancaster Counties on Thursday August 20th, 2026

Hazardous Weather Conditions

Hazardous Weather Outlook

Current conditions at

Jamestown, Chautauqua County/Jamestown Airport (KJHW)

Lat: 42.15°NLon: 79.27°WElev: 1722ft.

Partly Cloudy

63°F

17°C

Humidity	NA
Wind Speed	S 7 mph
Barometer	29.86 in (1011.0 mb)
Dewpoint	N/A
Visibility	10.00 mi
Last update	22 Aug 8:56 pm EDT

More Information:

Local Forecast Office More Local Wx 3 Day History Hourly Weather Forecast

Extended Forecast for

2 Miles WSW Irvine PA

Tonight
Low: 59 °F
Severe
Thunderstorms
then Chance
T-storms and
Patchy Fog
Sunday
High: 73 °F
Showers
Likely
Sunday Night
Low: 52 °F
Showers
Likely then
Showers
Monday
High: 70 °F
Chance
Showers
Monday Night
Low: 52 °F
Slight Chance
Showers
Tuesday
High: 77 °F
Mostly Sunny
Tuesday Night
Low: 52 °F
Mostly Clear
Wednesday
High: 81 °F
Mostly Sunny
Wednesday Night
Low: 58 °F
Mostly Cloudy

Detailed Forecast

Tonight

Showers and thunderstorms before 2am, then a chance of showers. Some of the storms could be severe. Patchy fog after 2am. Low around 59. Southwest wind 3 to 5 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.

Sunday

Showers and thunderstorms likely before 4pm, then showers likely and possibly a thunderstorm between 4pm and 5pm, then a chance of showers and thunderstorms after 5pm. Mostly cloudy, with a high near 73. West wind 5 to 9 mph, with gusts as high as 21 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Sunday Night

Showers and thunderstorms before 2am, then a chance of showers. Low around 52. West wind around 5 mph becoming calm in the evening. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Monday

A chance of showers, with thunderstorms also possible after 2pm. Partly sunny, with a high near 70. West wind 5 to 9 mph, with gusts as high as 22 mph. Chance of precipitation is 30%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Monday Night

A slight chance of showers before 2am. Partly cloudy, with a low around 52. West wind around 6 mph becoming calm in the evening. Chance of precipitation is 20%.

Tuesday

Mostly sunny, with a high near 77.

Tuesday Night

Mostly clear, with a low around 52.

Wednesday

Mostly sunny, with a high near 81.

Wednesday Night

Mostly cloudy, with a low around 58.

Thursday

A chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 83. Chance of precipitation is 50%.

Thursday Night

A chance of showers and thunderstorms. Mostly cloudy, with a low around 60. Chance of precipitation is 50%.