June 2023 pales in comparison to this event. There were ~3 total monitors back then that recorded a 24-hr AQI in the Hazardous category (all in PA). Yesterday there were dozens affecting tens of millions of people
Steve Seman
@steveseman.bsky.social
Director of Online Programs in Meteorology and Atmospheric Science; Associate Teaching Professor at Penn State.
Oof. AQI in State College has reached hazardous levels at the EPA site. PurpleAir sites around town have peaked above 400 this afternoon.
On June 22, State College was running an almost 3" rainfall deficit year-to-date. But, after almost 6" of rain in the last couple of weeks (including a daily record 2.11" yesterday, the deficit is gone and we have a small surplus year-to-date. #pawx
High temp yesterday in State College was 93º again, which means our string of no 95º+ days -- now approaching 14 years, lives on. It's the longest such streak on record by more than 2 years. #pawx
Wow! Well looks like here in Harrisburg, Pennsylvania we observed our all-time hottest average day on record yesterday! This is a result of record high overnight temperatures (81°F) and the afternoon high reaching well over 100°F. Station data at scacis.rcc-acis.org
State College high was just 93 yesterday, but the min temp of 77 ties the highest min temp on record at the site (it’s occurred 10 times, most recently in 2011) #pawx
Tmin of 76º in State College was actually not a daily record (77º in 1901), but still represents upper-echelon nighttime warmth. It's only the 16th occurrence of a min temp 76º+ since 1882, and is just 1º shy of tying the highest Tmin on record (which has occurred 9 times) #pawx
Pretty wild that State College has two record lowest max temps in the last 10 days (49º back on May 14, 51º yesterday), and sandwiched in between was a near record high (90º on May 18). #pawx
Impressive May chill yesterday in State College, PA. Tmax of 49º tied for the 4th lowest Tmax this late in the season. Only ones lower were a 48º (1959), 47º (1983), and 46º (2016).
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Central PA hasn't been near the seat of the heat lately, but it got impressively warm for March ahead of the storms yesterday. 82º in State College was a daily record, and the first time in the 80s in March since 1998. #pawx
I guess this is one way of saying that uncertainty in snow totals is larger than normal. 2-23" in Coatesville.
Even with the biggest snowstorm in several years a few weeks ago, State College has fallen behind normal snowfall to date. Normal snowfall through February 11: 26.5" Snow this cold season: 24.3" #pawx
As impressive as the recent cold stretch has been, State College still hasn't managed a day with a single-digit high. Yesterday was one of the better chances, but we made it to 13ºF. We haven't had a day with a high in the single digits since 2018. #pawx
State College up to 8 consecutive days with high temps less than 20º. That's the 2nd longest streak on record, trailing the 9 consecutive days from January 1893 #pawx
The last week of January in State College had a mean temp of 8.9ºF, and ranked as the 3rd coldest on record. (Though it wasn't close to the coldest 7-day stretch on record overall, which had a mean temp of -0.4ºF in February of 1899) #pawx
Elite pre-snow cold air. -2ºF this morning on campus at Penn State. Coldest morning of the winter so far #pawx
Impressive early December cold: Low of 8º this morning at the PSU COOP site in State College is the lowest this early in the season since 1989. Nowhere near a daily record though (-1º in 1917) #pawx
We've already had 8 sub-50º mornings on campus at Penn State since the beginning of August. That's the most up to this point in September since 1994. We haven't seen this many cool, crisp mornings at this time of year in a few decades.
A weather rarity in #StateCollege #pawx. May had 22 days with measurable precip, tying the record for any month since 1893. The only other months with 22 days of measurable precip also happened to be Mays -- in 2003 and 1908
With a modest 6.7" of snow so far this month, State College, PA is having its snowiest start to a calendar year since 2003. #pawx
Temps dipped to 7º before 7 AM this morning on campus at Penn State. That's the lowest temperature this early in the season since 2016.
After another 1.35" of rain in #StateCollege through 8AM, we're up to 5.56" for the month so far. This is by far the wettest start to April to date. Even without another drop of rain this month, we would finish with a top 15 wettest April. #pawx
Four-day rain total of 4.09" in #StateCollege -- an immense amount for meteorological spring. The last time we had a wetter four-day period in spring was April 1948! We won't need many more April showers this month... #pawx