Jns2183

What network are all the sites you post about on, co-op or cocorahs? When I was doing a spatial analysis of reporting stations I ran head first into Chester County, an enigma into itself with at ones being an incredibly densley observed county, yet parts are no better than the hinterlands of the north. Sent from my SM-S731U using Tapatalk

Some more fun things Sent from my SM-S731U using Tapatalk

here is a gif i made while working on a project that I think people might enjoy. It shows weather station density in PA, NY, NJ from 1930's to present day. https://drive.google.com/file/d/1r4BDH1gMlgvlXgP7s1zNFQnUv9bTeEhS/view?usp=sharing

I’ve been looking back at the January 25, 2026 storm where MDT pulled in about 11" of snow. One of the most frustrating parts of that event was the "yo-yo" effect: we went from heavy snow to sleet, back to snow, and then back to sleet again. We often talk about Dynamic Cooling (where heavy precip "drags" cold air down or uses melting/evaporation to zero out a warm layer), but in this storm, it felt like the heavy rates were also doing the opposite. I’d love to get some thoughts on the Latent Heat Paradox from this event: The Cooling Phase: At what point does the "Melting Tax" (energy absorbed to turn snow to rain) lose the battle to the Latent Heat of Fusion (energy released when rain freezes into sleet pellets)? It felt like the very act of creating sleet was releasing enough heat to "insulate" the warm nose aloft. Altitude of Condensation: Did the transition back to snow mid-storm happen because the best lift/condensation shifted into the Dendritic Growth Zone (DGZ), or did we just finally "exhaust" the warm nose through pure melting cooling? The Disconnect: How do we reconcile the massive negative anomalies we saw on the 850mb maps with the persistent sleet pings we heard on the windows? Was this a case of the storm "cooking its own environment" through condensation warming at the mid-levels? Would love to see some sounding analysis or thoughts on which latent process were dominant at which times Sent from my SM-S731U using Tapatalk

https://mesonet.agron.iastate.edu/ is absolutely amazing but a maize. I turned all my notes and such into a detailed thorough guide which will show you how to use everything available on that site. First draft but enjoy!!!! https://drive.google.com/file/d/1M59tszF8on7NCKx5jDxjthuXuQ25QnML/view?usp=drivesdk Sent from my SM-S731U using Tapatalk

Beautiful storm Sent from my SM-S731U using Tapatalk

I thought you might enjoy these graphs Sent from my SM-S731U using Tapatalk

Also that is my first attempt after doing a website. It's simple, but I'm sure I missed some bugs or something. I've also uploaded all the excels to the GitHub repository in public for anyone who wants to see the data Sent from my SM-S731U using Tapatalk

It's going to take a lot of rain to climb out of the 10-in hole we are in since last fall. Seeing plus two inches from March so far as nice but we need to build on that. Unfortunately the only way out I see is to have an incredibly stormy wet spring. It's funny as much as I looked into the '60s for snow I totally forgot that they were also note here in the summertime for a ridiculous drought for numerous years. Sent from my SM-S731U using Tapatalk

I present an interactive exploration of the weather from 2 stations 3.3 miles apart, one on a ridge the other on the lowlands with just a Susquehanna separating them. Note that is not my real last name I just didn't want to put my last name out there right now. https://jns182wx.github.io/kmdt-cxy-analysis/ Sent from my SM-S731U using Tapatalk

Outside the modern era was surprisingly hard to find times those two stations overlap and had good data but I did it was from 1948 to 1965 and I finished that analysis last night along with instead of just doing daily I did an hour by hour one because I had hourly data for that era and for this era so I will have a comparison up soon. Sent from my SM-S731U using Tapatalk

MDT vs. CXY: Quantifying the Bias Between Harrisburg's Two ASOS Stations (and Why It Matters for the Pre-1991 Record) Something that doesn't get talked about much in discussions of Harrisburg climatology is that the "official" record changed stations in October 1991 — from Capital City Airport (CXY, Fairview Township, York County) to Harrisburg International (MDT, Lower Swatara Township, Dauphin County/Susquehanna floodplain) — and that switch was made with no homogeneity adjustment whatsoever. The ThreadEx composite that most people pull from ACIS just splices them together at that date and calls it a day. I decided to actually quantify the bias using the 2001–2025 overlap period, when both stations were running reliably as ASOS units. 25 years of IEM daily data, both stations. Here's what I found. --- PRECIPITATION MDT runs wetter than CXY every single month except April, with an annual median ratio of 1.106 — meaning MDT receives roughly 11% more precipitation per year (43.3" vs. 38.4" mean over the overlap). The ratio is most consistent and statistically tight in winter (DJF ratio 1.126, tight bootstrap CI), which makes sense — synoptic-scale systems produce more uniform precipitation and the floodplain position at MDT reliably enhances totals. The widest uncertainty is in the summer convective months (Jun–Sep CI spans nearly 0.3), reflecting the high year-to-year variance when a single tropical remnant or MCS can hit one site much harder than the other. September has the largest single-month ratio at 1.164. April is the odd one out at 0.988 — essentially no bias. Spring frontal/stratiform precipitation appears to be the most spatially uniform regime between these two sites. The implication for ThreadEx is that the unadjusted splice at October 1991 introduces approximately an 11% step-down in precipitation when you cross back into the pre-1991 CXY period. Any trend analysis using that composite without adjustment is going to be systematically affected. --- TEMPERATURE The temperature story is more interesting than the precipitation one. Max temp is straightforward — MDT runs cooler than CXY all 12 months, ranging from −0.19°F in summer to −0.97°F in January. River valley moderating daytime heating, nothing surprising. Min temp is where it gets physically interesting: the offset reverses sign seasonally. MDT runs cooler than CXY in winter (as low as −0.71°F in February) but warmer in summer (+1.09°F in July). The crossover is right around April, which is near zero (+0.03°F). What you're seeing is the competing effects of cold air drainage into the Susquehanna floodplain in winter (making MDT colder at night) versus the river's thermal mass keeping the MDT boundary layer warmer on summer nights. CXY sits on a ridge position in Fairview Township at ~106m and apparently drains cold air off efficiently in winter while losing the river's moderating influence in summer. It's a textbook valley-versus-upland nocturnal temperature signature and it comes through cleanly in 25 years of data. --- DEWPOINT AND RH MDT runs higher dewpoint and RH than CXY all 12 months — no sign reversal here. The Susquehanna just keeps MDT moister year-round. The RH offset is largest in winter (DJF +3.68%) and smallest in summer (JJA +1.69%), which probably reflects the relative importance of the river moisture source versus atmospheric moisture demand across seasons. --- PRACTICAL UPSHOT If you're doing any work with the Harrisburg long-period record — trend studies, climatological normals, CAD research, whatever — and you're pulling ThreadEx without thinking about this, you should be aware of the discontinuity. The pre-1991 CXY record can be adjusted to MDT-equivalent using monthly multiplicative ratios for precipitation and additive offsets for temperature/dewpoint, derived from the overlap period. The adjustment is stable enough (particularly in the cool season) that I'm reasonably confident applying it back through the CXY record to 1939. Happy to share the Excel adjustment factor table if anyone wants — monthly ratios with bootstrap CIs, plus seasonal summaries broken out by DJF/MAM/JJA/SON. Sent from my SM-S731U using Tapatalk

At a certain point you can't hand hold the public. They either start to get it or they experience the consequences of not. My take is they are going to do whatever they want and if it goes wrong in any way they look to first person other than themselves to blame. Whatever it is that introduced this rot into our cultures era specific mindset needs to be ruthlessly scrubbed out. Sent from my SM-S731U using Tapatalk

Are you able to open the PDF I linked to from my Google drive,? Sent from my SM-S731U using Tapatalk

The graphics cards are ridiculous. I found a refurbished DELL LATITUDE 7420 i5 2.60GHz 16GB RAM 256GB SSD 14" laptop for $225 a few weeks ago and scooped it up. So much easier to use for lots of weather stuff than my phone. I just checked and same computer is already $50 more. Sent from my SM-S731U using Tapatalk