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Central PA Summer 2026 Discussion/Obs Thread


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Extreme Heat Warning

URGENT - WEATHER MESSAGE
National Weather Service State College PA
211 AM EDT Wed Jul 1 2026

PAZ019-026>028-036-045-046-049>053-056>059-063>066-012100-
/O.CON.KCTP.XH.W.0001.260701T1600Z-260704T0000Z/
/O.CON.KCTP.HT.Y.0003.260704T0000Z-260705T0000Z/
Southern Centre-Huntingdon-Mifflin-Juniata-Franklin-Southern
Clinton-Southern Lycoming-Union-Snyder-Montour-Northumberland-
Columbia-Perry-Dauphin-Schuylkill-Lebanon-Cumberland-Adams-York-
Lancaster-
Including the cities of Newport, Mount Union, Selinsgrove,
Pottsville, Lewisburg, Carlisle, Lewistown, Mifflintown,
Chambersburg, Gettysburg, York, Shamokin, Berwick, Lebanon,
Lancaster, Harrisburg, State College, Hershey, Lock Haven,
Sunbury, Huntingdon, Williamsport, Danville, and Bloomsburg
211 AM EDT Wed Jul 1 2026

...EXTREME HEAT WARNING REMAINS IN EFFECT FROM NOON TODAY TO 8 PM
EDT FRIDAY...
...HEAT ADVISORY REMAINS IN EFFECT FROM 8 PM FRIDAY TO 8 PM EDT
SATURDAY...

* WHAT...For the Extreme Heat Warning, dangerously hot conditions
  with heat index values up to 110 expected. For the Heat Advisory,
  heat index values up to 104 expected.

* WHERE...A portion of central Pennsylvania.

* WHEN...For the Extreme Heat Warning, from noon today to 8 PM EDT
  Friday. For the Heat Advisory, from 8 PM Friday to 8 PM EDT
  Saturday.

* IMPACTS...Heat related illnesses increase significantly during
  extreme heat and high humidity events.

* ADDITIONAL DETAILS...High temperatures will exceed 100 degrees in
  many places today, Thursday and Friday with even higher heat index
  values expected. Temperatures will be a few degrees lower on
  Saturday, but heat risks will continue.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Know the signs and symptoms of heat exhaustion and heat stroke.
Review heat safety and preparedness information at
weather.gov/safety/heat.

To reduce risk during outdoor work, the Occupational Safety and
Health Administration recommends scheduling frequent rest breaks in
shaded or air conditioned environments.

Power outages are possible during periods of extended heat as the
extra demand for electricity can tax the power grid. Be prepared for
a possible power outage.
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US issues emergency order for PJM Interconnection as heatwave looms

By Thomson ReutersJun 30, 2026 | 5:14 PM

June 30 (Reuters) – The U.S. Department of Energy on Tuesday declared an emergency across the nation’s largest power grid, citing soaring demand and supply ‌risks as extreme heat grips the region.

In an order issued under Section 202(c) of the Federal Power Act, the energy secretary said a statutory ‌emergency exists in PJM interconnection’s region ⁠due to a ⁠combination of surging electricity demand and limited generation capacity.

PJM submitted a formal request on June 29, warning of an “imminent electricity reliability emergency” driven by high temperature forecasts of around 95 degrees Fahrenheit or ⁠higher.

PJM is projecting “peak loads ⁠of approximately 159,563 megawatts (MW) on July 1, 2026 and approximately 162,860 MW on July 2, 2026. These levels raise risks ‌of supply shortfalls, threatening grid stability.

The grid operator also flagged that some generation units could face constraints due to a ⁠restriction under an environmental permit or state requirement.

The DOE said the order is necessary to ensure ⁠sufficient electricity ‌supply and to protect public ⁠safety.

PJM Interconnection serves a large swathe ‌of the eastern United States, and officials ⁠warned that without intervention, extreme weather conditions could lead to system stress severe enough to impact the ability to meet electricity demand

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On 6/25/2026 at 11:31 AM, Mount Joy Snowman said:

Crystal Ball says we end the month with a mean temp of 73.9 degrees, about a degree and a half AN and good for 13th warmest all-time.  Book it.

MDT ended the month with a mean temp of 73.8 and only .73" of rain, which is good for the 3rd driest June ever.  I received 1.46" in June and have 16.41" for the year.  I totaled 52.41" last year.

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We finished June with temperatures for the month only slightly above normal. Our extremely hot stretch of weather begins today and will continue through the weekend. The hottest days look to be both Thursday and Friday where we will be in the upper 90's on the ridges and near or above 100 degrees in the valley locales. Shower chances increase by July 4th night and continue into Sunday and Monday. This will start to trim the extremely high temperatures and by next Tuesday we will be back to near normal with highs in the mid 80's.

image.png.6de44ad98886fc192a6696b8cfc08bcc.pngimage.thumb.png.81e644305c7227429109f9c84d0828c8.png

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19 hours ago, Jns2183 said:

What I mean is the elevation is accounting for less than 10% of that difference. Everything else is due to what type of area it was placed it, canopy location, if it had good radiation shielding, if it used an aspirator, location of it to buildings, decks, house, rows. Realistically elevation is almost certainly less than 5% of the difference

Sent from my SM-S731U using Tapatalk
 

Got it! thanks!

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82 dewpoint here. Now only if we could get thunderstorms to fire up with the heat and humidity it would be nice. My shirt was completely soaked from sweat working in the garden for 3 5 hrs. Got what needed done. Garden finally drying out from the rain we had and the irrigation that I did before we got the rain. It was basically a muddy mess you sank when you trid to get in the garden.

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Here in Carlisle just after 12:30pm...the temperature is 94.6 degrees with a dew point of 80.2 degrees.  This combination creates a heat index of 115.2 degrees.  These numbers are already ridiculous and set to be worse tomorrow.  Dew Points of 80+ degrees are not common in our part of the country.  It's nearly impossible to exceed a dew point of 83 degrees.  It's way too dangerous to go outside for any period of time (for we seniors).  I'll update again in the next hour or two.  I think 100 degrees here is a possibility, but less than 50% likelihood.  Some locations around the LSV are going to reach heat index values of 120+ degrees.  Personally, I think I've only ever witnessed an HI at or over 120 degrees maybe 2-3 times my entire life (and I'm 66).  I just keep praying for all of us that we don't have brown-outs or worse yet, black-outs.  Time will tell.

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1 minute ago, CarlislePaWx said:

Here in Carlisle just after 12:30pm...the temperature is 94.6 degrees with a dew point of 80.2 degrees.  This combination creates a heat index of 115.2 degrees.  These numbers are already ridiculous and set to be worse tomorrow.  Dew Points of 80+ degrees are not common in our part of the country.  It's nearly impossible to exceed a dew point of 83 degrees.  It's way to dangerous too go outside for any period of time (for we seniors).  I'll update again in a the next hour or two.  I think 100 degrees here is a possibility, but less than 50% likelihood.  Some locations around the LSV are going to reach heat index values of 120+ degrees.  Personally, I think I've only ever witnessed an HI at or over 120 degrees maybe 2-3 times my entire life (and I'm 66).  I just keep praying for all of us that we don't have brown-outs or worse yet, black-outs.  Time will tell.

I think the dewpoint might be lower tomorrow and Friday - upper 60s to around 70 instead of what we're seeing today. 

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1 hour ago, CarlislePaWx said:

Here in Carlisle just after 12:30pm...the temperature is 94.6 degrees with a dew point of 80.2 degrees.  This combination creates a heat index of 115.2 degrees.  These numbers are already ridiculous and set to be worse tomorrow.  Dew Points of 80+ degrees are not common in our part of the country.  It's nearly impossible to exceed a dew point of 83 degrees.  It's way too dangerous to go outside for any period of time (for we seniors).  I'll update again in the next hour or two.  I think 100 degrees here is a possibility, but less than 50% likelihood.  Some locations around the LSV are going to reach heat index values of 120+ degrees.  Personally, I think I've only ever witnessed an HI at or over 120 degrees maybe 2-3 times my entire life (and I'm 66).  I just keep praying for all of us that we don't have brown-outs or worse yet, black-outs.  Time will tell.

Had a dewpoint earlier of 86

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