chubbs

I haven't been following, but there have been unusually strong NE trades in the Atlantic MDR for the past 3 months which would cause upwelling. The mid-Atlantic subtropical ridge looks stronger than normal.

This 2013 paper on snowfall in the Northern Hemisphere is on track so far. Snow is expected to be a lagging indicator of climate change due to offsetting effects of precipitation and temperature and natural variability. Have to be well up in Canada, with average winter temps of -10C, to see a net snowfall benefit from warming. Further south, downward snowfall trends will emerge slowly as the Century progresses. Two steps down and one up kind of thing. https://journals.ametsoc.org/view/journals/clim/26/20/jcli-d-12-00832.1.xml

His comments are dumb. Shows he doesn't understand the climate system. Apologize for the complicated chart, which is from a recent paper on the causes of warming in the 23-24 nino. The ocean is being warmed from the surface down (bottom chart). The timing of surface ocean and atmosphere warming (AE is atmospheric energy in second chart from bottom) is modulated by enso. The warming of the ocean is due a global net radiation imbalance (second chart from top), which is also modulated by enso. Overall there's a balance between the net energy coming in at the top of the atmosphere and the amount of heat in ocean (see paper). No room for seismic energy to play a role as energy from the sun can explain all the ocean warming. Energy accumulates gradually in the ocean during La Nina and is partially released during el nino to upper ocean, atmosphere and space (outgoing radiation). During El nino net radiation falls (second chart from top) but only to the net balance line, i.e., the atmosphere can hold the added el nino heat it is receiving from the ocean. If the warming was due to seismic the added seismic energy would lead to a negative radiation imbalance as the added seismic heat would increase outgoing radiation. Note that the paper concludes that the increasing net radiation imbalance means we should expect a doubling of the rate of SST rise over the next 20 years. https://iopscience.iop.org/article/10.1088/1748-9326/adaa8a

One factor is the pattern reversal along the Atlantic front in March. From warm compacting to cool exporting winds. While extent has expanded there is also high ice export through Fram and Franz Joseph straits. Pattern looks to continue for the next week. Note that this would be an unfavorable pattern in summer. With sunny conditions under Arctic high.

Your being confused by station moves. We've been over the importance of West Chester and Coatesville station moves a zillion times. The moves were large enough to obscure the real climate trend. As shown upthread, without the station moves there is no cooling at West Chester or Coatesville. Here's another way to remove the station moves: plot the before and after move data separately. Without the confusion of the station moves, West Chester and Coatesville are in good agreement on our local weather. Before the station moves, May temperatures were close to 62F at the two stations. After the moves they had cooled to 60F. The trend lines for West Chester and Coatesville both before and after the station moves are almost the same. There is no change in temperature before the station moves; and, warming after the station moves. Further confirmation that West Chester and Coatesville have warmed in May. The effect of the station moves is easily seen by comparing the regression lines around the time of the moves. Immediately before the station moves, May temperatures were close to 62F at the two stations. After the moves they had cooled to 60F. This example shows the value of bias-adjustment. As Coatesville and West Chester demonstrate, the raw data from a single station can be misleading when there are major station changes. This isn't rocket science. Knowing the station histories, it is easy for me to remove the station moves and get a more accurate climate trend that is close to NOAA. You could do the same.

Nope, one station too warm or too cold doesn't bother me at all. We have thousands of temperature stations in the US and weather data is correlated for hundreds of miles. Easy to spot and correct stations with problems whether its sensors, station location, or change in local land-use (heat islands). The only thing that bothers me is claims that there is something wrong with our knowledge about recent temperature trends.

You aren't showing any station data though. Zero. Just your network averages that are contaminated with station moves and network changes. If you want to argue that the other stations refute West Chester and Coatesville, show the actual raw station data. Good luck, because the other long-term station, Phoenixville, also shows slight warming. West Chester and Coatesville are the only Chesco stations with multi-decade periods with no significant station changes, during those periods the raw data is only responding to weather. We have had one set of weather in Chester County, that is well depicted by West Chester and Coatesville raw data and NOAA. The other stations don't show anything different.

You are making a mountain out of a molehill. The Philly airport ran roughly a degree warm in 2022. The sensor was replaced and 2023 and 2024 are back to normal. Easy to track by comparing to nearby sites. NOAA and other experts won't be fooled.

Nope. You don't know what the raw data shows. The raw data from West Chester and Coatesville shows warming in May. Not as much warming as March, but warming nonetheless. West Chester and Coatesville both have long periods where station changes were minor allowing the true climate trend to be determined.

Raw data from West Chester and Coatesville shows March has warmed significantly in Chester County. I'm sure April and May have similar amounts of warming. The evidence is overwhelming that our county has warmed significantly.

Nope again, I have provided the answer umpteen times. The stations that you complain about are in WARM locations. Warmer than the county as a whole. Its not accuracy; its location, location, location. Simple as that and the evidence is overwhelming. All you have to do is look at a map and land-use near the stations. The raw temperature data confirms the warmth of early measurement sites. The early stations are about as warm Wilmington, Philadelphia or the Newark ag station. As soon as the Coatesville and West Chester moved to cooler locations, more representative of the county as a whole, NOAA matched them closely.

Surprised that you aren't more familiar with the station data or histories. West Chester is very representative of the early Chesco coops. Similar in temperature to Coatesville pre-move, Sadsburyville, and Kennett Square, and cooler than Phoenixville. Looks like Sadsburyville is in also in a town, like the early Coatesville and West Chester stations. The 1948 Coatesville station is the first county station that is more representative of the county as a whole; and, NOAA matches it well. You can't understand the county climate history without studying the station network and how it has changed with time. Among other changes, there is a reverse heat-island effect in the Chesco stations as people and stations moved out of towns to more rural locations.

Nope. Of course I see that the older stations are warmer than NOAA. Perfectly understandable to me. The old Chesco stations are in warm locations. Before the 1970 move, West Chester was as warm as Wilmington. Why would anyone expect the Chester County average to be as warm as Wilmington?

If you account for the 1970 West Chester move, NCEI is spot on. West Chester and Coatesville cooled at different times: Coatesville after the war and West Chester in 1970. Station moves not weather. Agree that facts always win out, but you can't pick and choose.

Nope again. The difference in the trend-lines is mainly due to the Coatesville post-war move. In comparison West Chester closely matches NOAA with no cooling. How many times do we have to go over the same material showing that the raw Chesco data is contaminated by station moves and other non-climate related changes.