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Low of 50. Some nice crisp fall nights ahead.

Euro looks solid

GFS and the Euro now have something late month

We don't have any Chesco stations that haven't had major changes. But one station, Phoenixville, provides consistent data for 1890-1926 vs present. Phoenixville has had moves and station changes, but has remained on the local water property site since 1893. This site, with a small reservoir, has not seen any significant development during the period of station operation. There have been major station changes at Phoenixville however, which we have documented previously on this site. The station ran spuriously warm between 1927 and 1949, particularly on summer afternoons; and, ran cool in the 1990s. There is also a fair bit of missing data Charts below: 1) Phoenixville and NOAA Chesco showing good agreement on the roughly 4F Chesco temperature rise between the 1890s and present. 2) Adjusted and unadjusted temperatures for Phoenixville showing the roughly 4F warming in both the adjusted and unadjusted data, but with large adjustments for 1927-49 and the 1990s as discussed above, and 3) Annual 90F days for Phoenixville and other stations showing a large spurious spike at Phoenixville in the 1927-48 period, illustrating the station warmth during this period. We've been going over the Chester County data in detail for over a year. Well documented in the Chester County thread. I would be glad to answer any questions if you are interested. The raw data in Chester County paints a very consistent picture of warming that is captured accurately by NOAA. The fact that Paul (Chescowx) can't find warming tells us more about himself than Chester County's weather.

Uh oh. raindance's post got the most likes in this thread. Be on alert for the opposite to happen.

Looks like Halloween is going to be cool/cold this year. In the 2000s, we've had some very warm Halloweens

Are there not any long term, reliable stations in the area that haven't moved or seen major changes around them?

A warm pool around the Aleutians makes sense. All the seasonal models are unanimously showing an Aleutian ridge this winter. It fits a normal canonical La Niña Aleutian ridge regime. They are also all maintaining a -PDO, strength TBD

Ended up with about a third of an inch. Any rain is good rain right now

Picked up 0.50 storm total peak wind gusts around 40 mph a few weak trees came down here and there. Keep an eye out for one last gasp of the tropics months end.

Looks like 0.76" for the event. Went from 90 and sun in CA a week ago to low 50s and sheet rain. Nice to have the pattern change.

All jokes aside that would be an absolute disaster!!!

Tony Pann posted something… interesting “No Hurricanes have made landfall in the US so far this season. And only one Tropical Storm (Chantal). Over the last 20 years, there have been 5 years with no Hurricanes making landfall: 2006, 2009, 2010, 2013, 2015. The average winter snowfall for Baltimore in the following winter: 35" Obviously this could be correlation and not causation but it’s an interesting factoid.

What an insane storm.

Y'all the GFS does this every year. If a wave can make it to the Caribbean then we can talk. Despite incredibly favorable conditions for much of the season, the Caribbean has been devoid of meaningful activity.

From the ENSO thread

Palisades Tahoe is currently experiencing heavy snow and blowing snow https://www.palisadestahoe.com/mountain-information/webcams Mammoth was very heavy but is lighter, looks to be about 7-12 on the ground at Main Lodge and Woolly Cam. McCoy Station earlier in the daytime, they really got slammed HARD, they are at 10000 feet and may have well over a foot of snow and still snowing hard up there! Nice early season snow! This is early for them, we are talking at least a foot of fresh snow on the slopes. Should be a good base to blow more artificial snow on top of and get them open really early! Mammoth just invested in better snowmaking equipment! More snow coming in a few more days! Woolly Cam https://www.mammothmountain.com/on-the-mountain/mammoth-webcam/woolly-cam You can see ripples on the snow caused by strong winds blowing it all over! We're getting this started REALLY EARLY!!!!

Was that a normal part of previous -PDO cycles we've had?

It's amazing what one sometimes sees at the long range. For example this huge extra-tropical swallowing a major hurricane on the East Coast. You go GFS!

You mean trade? These pests come over on ships from overseas. Ships have been engaged in trade for 1000 years. Ships brought over a lot of what we may think of as native. It’s how it always has been and always will be

Globalism and all its wonderful side effects. I lost a 60 year old Ash tree to the Emerald Ash Borer. It was a gorgeous tree with a beautiful canopy that provided tons of shade and a beautiful fall foliage.

That has not been my experience- we’ve lost almost all our ash in the last 10 years and now beech leaf disease is killing all the beech!

If one is looking for a reliable climate record, adjustments are necessary whenever a station moves. Here's an illustration. Envision a case where one is measuring the temperature in Queens, NY. Assume that the climate record starts in 1990 for purposes of illustration. Temperatures are taken at LaGuardia Airport through 2014. After that, the Queens station moves to JFK Airport. Temperatures are then recorded at JFK Airport through 2024 for purposes of this illustration. If one relied only on raw, unadjusted data, here's what the Queens climate record would look like: There would essentially be no trend in temperatures. Those arguing for the use of unadjusted data would argue that warming is an artifact of statistical adjustments. But here's what things would actually look like: JFK: LaGuardia: The graphs reveal a clear discontinuity in the temperature record when switching from LaGuardia Airport (1990–2014) to JFK Airport (2015–2024), even though they are only 10.9 miles apart. The resulting trend is artificially altered by the change in station location, not by climate. In fact, both stations were warming at similar rates. This simple illustration demonstrates that without adjusting for such moves, the integrity of the climate record ceases to exist. The synthetic station trend is lower than either station individually. In other words, threading the raw data to maintain a continuous climate record creates a badly biased outcome. In sum, station moves introduce biases. To maintain an accurate climate record, data must be homogenized. The data must be corrected for site changes, if one wants an accurate climate signal.

Friday morning looks chilly for most of us. Even low 40's down my way.

All I know is that you are good at ignoring data that doesn't agree with your worldview. The station move data is unambiguous. Coatesville in 1945 and 1948. Surprised a heat island expert like yourself can't see the difference in these two sites, built up town vs very rural. I certainly wouldn't expect them to have the same temperature. The raw data from surrounding stations allows the effect of the Coatesville move to be determined accurately. This isn't a small change; easy to see the overall effect by comparing the relative position of Coatesville before and after the moves. Before the move, Coatesville was warmer than West Chester and almost as warm as Philadelphia. After the move Coatesville was as cool as Allentown. Roughly 2F cooling overall. Furthermore there many stations other than these 3 that confirm the magnitude of the Coatesville move. It's an open and shut case. We know the when and where of the Coatesville move and we know how Coatesville changed relative to other stations in the region. The evidence for the West Chester move in 1970 is just as strong. Very easy to separate weather from station moves when you know how to do it.