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Central PA Spring 2026 Discussion/Obs Thread


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As we get into the summer months lower elevation (<450 ft asl) areas of Chester County PA will see at least one heat wave (defined as 3 or more consecutive days with highs at 90 degrees or above) while the relatively higher ridge locations (>600 ft asl) only average a heat wave every couple of years or so. Below sorted by highest to lowest elevation is a ranking of all reporting stations since 2000 with their recorded heat waves. Our lowest elevation spot at Phoenixville averages a whopping two to four times the number of heat waves as almost all other locations across the county.

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16 minutes ago, pawatch said:

37 degrees this morning.  :angry: Can’t remember seeing such temperature swings.

No surprise though with the clear blue skies last night.

Temp took a big dip here the past two hours. It was 42 when I got up at 4:30, but now it dropped to where we officially got down to 39 at 6:30.

Crazy...

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22 minutes ago, mahantango#1 said:

39 frigid degrees was my low too. What season are we in and what season are we headed to?

Looks like maybe summer by the end of the week. Question is, do we keep it, or do the temps tank again after next weekend?

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15 minutes ago, Voyager said:

Looks like maybe summer by the end of the week. Question is, do we keep it, or do the temps tank again after next weekend?

Thats the million dollar question. I hope were done with this cool, sometimes cold, cloudy windy weather till November. But I think we need further guidance on this matter.

OIP.IRZSN7hvC1r9EwfOs8a2QwHaC9?pid=Api&h=220&P=0

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Lows this morning were not too far from record cold levels for the final day of May. The lowest was the 38-degree reading at Warwick Township. During our last 37 days we have seen 26 of those days with below normal temperatures here in East Nantmeal. This pattern looks to it will continue through mid-week before we finally see temperatures warming to above normal by the end of the work week. Unfortunately there is no rain in site.

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Im not saying I know more but I know what I see on news reports when they claim we only got .75 of rain but the collector at my house which is near the reporting station they use has 1.33 inches. I know because I have seen how rainy the last few months have been. sure not every rain even is a downpour some days its just light rain all day but that adds up. Wed we just had .29 inches of rain and abc27 said only a trace? I had to cut my grass like 5 times in the last month its growing like crazy cause all the rain we have had. the th river has been hovering around 5-6.4 feet for most of the spring thats pretty healthy water lvl considering they say we are in a drought. The average water level (or gage height) of the Susquehanna River in Harrisburg during the spring typically ranges from 3.5 to 7 feet.so this is a average water depth. 
 
I also go fishing a ton with a group of friends streams and creeks water lvls are pretty healthy for this time of year. ive see way lower water levels in the past with less of a drought. so this is why I quesiton. I see what they say but I use my eyes to see as well and frankly its not mathing.  
Groundwater is a different animal to all of those things. You need to ask yourself what you are measuring because your measuring different things. There's things like river gauge level for things you want to measure.

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PA Weather Plus, LLC  ·

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 41 Years Ago Today: The May 31, 1985 Tornado Outbreak 
Today, we pause to remember one of the most catastrophic severe weather events in Pennsylvania’s history. On May 31, 1985, a violent tornado outbreak swept across Ohio, Pennsylvania, New York, and Ontario. It was the largest and deadliest tornado outbreak ever recorded in Pennsylvania, with 21 tornadoes touching down in the state and 65 lives lost here alone. It led to the state's first and only F5 tornado. This violent tornado came out of eastern Ohio, devastating the community of Wheatland with winds over 300mph. Over 95% of Wheatland's trucking and steel industries were destroyed in the tornado. Another long-track F4 tornado tore through the Moshannon State Forest for 69 miles, destroying a total of 88,000 trees! With thousands of large trees falling at once, it set off seismographs at Penn State! This day remains the state's deadliest tornado day and it the outbreak alone destroyed over 1,000 homes. This outbreak caused over $600 million in property damage, which would be equivalent to $1.72 billion in 2025.
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Remembering the Johnstown Flood – May 31, 1889 
It seems like May 31st is a cursed weather date here in Pennsylvania with tornado outbreaks and dam breaks!
136 years ago today, one of the deadliest natural disasters in U.S. history struck Pennsylvania. On May 31, 1889, the South Fork Dam collapsed after days of relentless rain, unleashing 20 million tons of water from Lake Conemaugh into the Conemaugh Valley—and straight into the heart of Johnstown.
In a matter of minutes, a wall of water 35 feet high raced downstream at speeds of up to 40 miles per hour, destroying everything in its path—homes, bridges, trains, factories, and entire neighborhoods. Over 2,200 people lost their lives, including entire families, and more than 700 were never identified.
The Johnstown Flood was not just a tragedy—it was also a turning point in American history. It prompted a nationwide outpouring of aid and led to major changes in dam safety regulations and emergency response planning. The American Red Cross, under Clara Barton, responded to its first major disaster here.
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