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Central PA Summer 2025


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The NWS has the next 5 days here in East Nantmeal with forecast high temperatures over 90 degrees. I have been taking observations here for 22 summers since 2004. I have only experienced a "heat wave" (3 consecutive days of 90+ temps) but 5 times. 2006 / 2008 (2x) / 2010 and the last time in 2020. In each of those years we only saw 3 straight days with 90 plus readings. Other high elevation spots in the county including Atglen and West Grove has also seen very few defined "heat waves". This week sure looks likely to even in these higher spots result in at least 3 straight days of heat.

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More detail on the other Chester County sites where heat waves are rare. At West Grove with data since 2009 there have also only been 5 heat waves. With those occurring in 2011 / 2012 (2x) / 2013 and the last time in 2018. Also over in Atglen with records since 2012 - only 3 heat waves in the last 13 summers occurring in 2013 / 2023 and 2024.

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4 hours ago, Itstrainingtime said:

MRGL risk of severe thunderstorms tomorrow. That came out of nowhere.

The upper levels are wild. Were today and will be through Tuesday. Nothing should get pushed but if so isolated damaging wind is likely. 

That derecho out in ND had 105 mph straight line winds (outside the massive tornadoes). That’s partially over us. 

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Hazardous Weather Outlook
National Weather Service State College PA
427 AM EDT Sun Jun 22 2025

PAZ036-056-057-059-063>066-230830-
Franklin-Perry-Dauphin-Lebanon-Cumberland-Adams-York-Lancaster-
427 AM EDT Sun Jun 22 2025

...EXTREME HEAT WARNING IN EFFECT FROM 11 AM THIS MORNING TO 8 PM
EDT WEDNESDAY...

This Hazardous Weather Outlook is for central Pennsylvania.

.DAY ONE...Today and tonight.

Please listen to NOAA Weather Radio or go to
weather.gov/StateCollege on the internet for more
information about the following hazards.

   Extreme Heat Warning.

Isolated strong to severe thunderstorms with gusty winds and small
hail are possible this afternoon and evening.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

Please listen to NOAA Weather Radio or go to
weather.gov/StateCollege on the internet for more
information about the following hazards.

 Extreme Heat Warning.

A significant and extremely dangerous heat wave will continue through
Wednesday. The risk of heat-related illnesses will be elevated given
limited acclimation. Heat impacts are likely in some health systems,
heat sensitive industries, and infrastructure.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.
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