bluewave

Here are some higher res Euro summer forecast maps showing the wetter pattern continuing through the summer.

7.36” max to our north is improving the drought conditions there.

Yeah, points east of NYC haven’t seen 100° heat since the 2010-2013 era. That was when the ridge was centered near the Great Lakes keeping the flow more westerly. These days we get a big ridges east of New England keeping the flow more onshore. So it’s more about the higher dew points for us.

It certainly has happened at times during recent summers like in June 2021 when the onshore flow kept the 100s to the west of Long Island. Monthly Data for June 2021 for Upton NY NWS CWA Click column heading to sort ascending, click again to sort descending. NJ NEWARK LIBERTY INTL AP WBAN 103 NJ HARRISON COOP 101 NY LAGUARDIA AIRPORT WBAN 100 NJ CALDWELL ESSEX COUNTY AP WBAN 100 NJ CANOE BROOK COOP 98 NY NY CITY CENTRAL PARK WBAN 98 NJ TETERBORO AIRPORT WBAN 98 CT MERIDEN MARKHAM MUNICIPAL AP WBAN 98 CT DANBURY MUNICIPAL AP WBAN 97 CT NORWICH PUBLIC UTILITY PLANT COOP 96 CT IGOR I SIKORSKY MEMORIAL AIRPORT WBAN 96 CT DANBURY COOP 96 NY CENTERPORT COOP 96 NY PORT JERVIS COOP 95 CT OXFORD WATERBURY WBAN 95 NY WESTCHESTER CO AP WBAN 95 NY SHRUB OAK COOP 94 CT NEW HAVEN TWEED AP WBAN 94 NY BAITING HOLLOW COOP 94 CT STAMFORD 5 N COOP 94 NY MONTGOMERY ORANGE COUNTY AP WBAN 93 NY SYOSSET COOP 93 NY MOUNT SINAI COOP 93 NJ CHARLOTTEBURG RESERVOIR COOP 92 NY RIVERHEAD RESEARCH FARM COOP 92 NY FARMINGDALE REPUBLIC AP WBAN 91 NY JFK INTERNATIONAL AIRPORT WBAN 91 NY MATTITUCK COOP 91 NY ORIENT POINT STATE PARK COOP 91 NY CARMEL 4N COOP 91 NY ISLIP-LI MACARTHUR AP WBAN 90 NY SHIRLEY BROOKHAVEN AIRPORT WBAN 90 CT GROTON COOP 90 NY UPTON COOP - NWSFO NEW YORK COOP 89

Looks we are on track for another year around 1.5C above preindustrial levels.

Not sure. But the Euro is usually more accurate with the summer than the winter forecast for us. Probably due to less moving parts in the summer so to speak. The reason it may be wet for us is that there are two ridge centers showing up for the summer forecast. One east of New England and another out West. So perhaps the model is trying to show a weakness in the ridge where there could be some moisture pooling. We’ll see if it has a clue. It’s the same idea as the CPC summer forecast. So probably more high dewpoints and onshore flow like we have been seeing in recent years if correct.

The Euro has two more rainy cutoffs after this one the next few weeks. The next once comes through later in the week. Then another one before the 15th. It will be interesting to see if the Euro is correct about a wet summer for us. As it would keep the strongest heat out West where the drought feedback really kicks in.

It was as if we crossed an invisible threshold in 2023. Perhaps the oceans just reached the point where they could no longer absorb the excess heat anymore. Almost like filling a glass with water and not seeing much of an issue until it starts spilling over the rim. So the excess heat is being released into the atmosphere instead of staying put in the oceans. Non-linear or threshold effects usually only become known once the barrier has been crossed. This is the risk of treating climate change solely as a linear gradual process which has lead to climate complacency.

It’s all relative to what the average rainfall is in any given area. Of course more arid and semi-arid regions experience less rainfall. But if you shut off the rainfall in a drier region like Southern California, then severe drought conditions will develop if it only a tiny fraction of what is normal for those local areas falls. In reality, those areas which burned last winter around LA used to be wild areas with very few inhabitants as recently as a couple hundred years ago. Now add the acceleration of the water cycle with wetter rainy periods spurring dense undergrowth from climate change followed by record drought and you saw what they were up against out there. Plus the changing 500mb and surface patterns lead to record winds. So poor land management practices combined climate change is a very dangerous combination.

We had one of the wettest springs on record in 1983 with extensive basement flooding in Long Beach. But the entire Eastern US had a very dry summer. So it can only take a few weeks during peak summer heating for drought conditions to develop when it doesn’t rain. Plus you have to take into account the source region of the heat which is moving into the area. 2011 had the worst drought since the dust bowl in Texas which extended up into our area through most of the East. If the whole region surrounding our local area is dry, then the drought feedback will affect our temperatures also since the flow is from those dry areas.

Everyone has their own personal preferences as to which type of weather they enjoy. So this part of the forum discussion is purely subjective. Drought feedback, summer rainfall, prevailing wind direction, and the main ridge axis are the key ingredients in determining how many 95°+ or 100°+ days we get around the area. The summers of 1983 and 2011 were very dry when we had all the record major heat around the area. Both summers only became wet once the heat was already finished. You are correct that flooding has produced a tremendous amount of damage in recent years across the entire country. Drought damage has mostly been located out West where the major wildfires have occurred. Currently, a large portion of the area has experienced drought conditions since last summer. It has been most pronounced from Eastern PA into portions of NJ. But D1 and D2 drought conditions also over to Orange and Rockland in NY. Models like the Euro would have drought improvement for the areas from NE PA across into SNE. But locations further south toward Philly and SNJ wouldn’t see much improvement. The Euro seasonal is out tomorrow for the summer. So we should get some hints as to where the drought is forecast to expand or contract and how much major heat will be possible. The most recent dry summer during peak heating was 2022. But onshore flow combined with drought feedback in NJ focused the major heat there with the 5+ days going over 100°. But the onshore flow kept points east of the Hudson cooler.

The RGEM would be a nice soaking event across our area but Philly into SNJ would miss the jackpot again.

Always have to wait until we get to within the range of the higher res models like the SPC HREF. The 12 z runs today will be the first to be within range of the heaviest rain potential next 48-60 hrs. Longer range globals beyond a few days struggle with the placement of the heaviest convection.

Looks like April was the 2nd warmest on record. https://bsky.app/profile/climatecasino.net The global temperature anomaly for April, 2025, came in at 1.51°C above the 1850-1900 pre-industrial baseline, making April, 2025 the second hottest on record since 1940, behind only 2024 (1.58°C). The year-to-date anomaly is currently at 1.61°C above pre-industrial

Yeah, the WAR is verifying stronger than earlier forecasts. New run Old run

Newark currently in 2nd place for the most 85° days by May 2nd at 3 days so far. Time Series Summary for NEWARK LIBERTY INTL AP, NJ Click column heading to sort ascending, click again to sort descending. 1 2002-05-02 4 0 - 2001-05-02 4 0 - 1962-05-02 4 0 - 1941-05-02 4 0 2 2025-05-02 3 0 - 2023-05-02 3 0 - 2017-05-02 3 0 - 2010-05-02 3 0 - 2009-05-02 3 0 - 1990-05-02 3 0 - 1985-05-02 3 0 - 1977-05-02 3 0 - 1976-05-02 3 0 - 1960-05-02 3 0 - 1945-05-02 3 0 3 2024-05-02 2 0 - 2021-05-02 2 0 - 2011-05-02 2 0 - 1998-05-02 2 0 - 1994-05-02 2 0 - 1991-05-02 2 0 - 1969-05-02 2 0 - 1957-05-02 2 0 - 1938-05-02 2

My call that the snowfall peaked in 17-18 from Philly to Boston and we were at the beginning of a snowfall decline is based on 60 years of snowfall data. I first raised this possibility back around the 2020 winter after only 2 years. I can remember getting plenty of pushback when I raised this possibility just after 2 seasons. But it’s a bit like that old game show Name That Tune. I only needed a few notes to recognize the pattern. In the following years we got more data to confirm my idea. When there was a much colder climate from the early 1960s to the early 1990s, there wasn’t an all or nothing snowfall pattern. Most of the seasons were in a narrow range focused near the long term average mid-range. There were few seasons with very high or very low snowfall. This all began to change in 93-94 as nearly all our snowfall seasons were well below or well below with almost none in the mid range which was a staple of our colder climate. We were cold enough back then to have a bunch of small to moderate events in a season without a KU NESIS storm to reach average. In contrast, none of the seasons since 93-94 reached average or above without some NESIS event contributing to a the seasonal snowfall total. So as we warmed our snowfall became all or nothing. The record 2010s featured mostly all or well above normal seasons. This period indeed was warming while the heavy snowfall was occurring. But even in the warmer winters the snowstorm tracks were still cold. As the Northern Stream of the Pacific Jet was weaker and didn’t disrupt benchmark storm track formations. These days the winter storm tracks have significantly warmed with the storm tracks shifting through the Great Lakes. This lead to an average temperature of 41° degrees this past winter in the I-95 corridor in the days the precipitation over .25 fell. so it negated the overall 34.8° colder average. The dominant storm tracks since the increase of the Northern Stream of the Pacific Jet speeds in 18-19 have been Great Lakes cutter, I-95 , I-78, I-80, and I-84 huggers, and suppressed Southern Stream storms. This makes it very difficult to get to average to above average snowfall. This is why the last 7 years have seen snowfal amounts near all-time lows for a 7 year interval. So we had to rely completely on one type of storm track to reach average to above average snowfall over the past 30 years. But having to rely exclusively on the benchmark storm track in a warming climate has pitfalls. Before 93-94 we would regularly have snowy seasons with hugger and weaker coastal storm tracks since it was still cold enough with those tracks to reach average. These days this type of storm tracks has become much warmer with mostly rain. There was a wider number of ways to get to average when it was colder. The 2010s featured a record number of benchmark storm tracks. This level of benchmark snowstorms was somewhere in the range of a 50 to perhaps 100 year event. So it’s unlikely that amount of benchmark tracks will repeat anytime soon. So we are left with a few scenarios going forward over the next 7 seasons and beyond. One is just a continuation of the last 7 years with well below average snowfall continuing. Another possibility is that we could see a bit of an uptick in benchmark tracks and some improvement over the past 7 seasons. Though any increase would probably come in well below the 2010s levels. My guess is that this would be transient before a lower snowfall regime returns in the 2030s and beyond. The obvious caveat would be some time of super volcanic or cosmic event which would completely shift the climate in a sudden and dramatic way. Absent something like this, increasing emissions will continue to reduce our snowfall over time.

This doesn’t have anything to do with whether you are taking the measurements in a big city of the surrounding areas. It’s is a region-wide phenomenon including all the locations within the general I-95 corridor. First, we don’t have a continuous snowfall record for your individual location spanning more than 60 years. So you are just guessing when it comes to how your recent snowfall compares against historical averages. Second, the stations around your region are in a similar boat as the other bigger city stations that have a longer period of record. So this snow drought is very extensive and isn’t just located in the big cities. Since you can see how close Philly to Trenton and New Brunswick have been. Everyone is near the record 7 season snowfall lows. But we have warmed so much, that a big rebound in the coming years like which followed past snow droughts isn’t as likely. So we are seeing what a decline in snowfall looks like in real time as a warmer climate and storm track will result in less snow. So while it’s within the range of possibilities that we could see a bit of a bounce off these lows in coming seasons, my guess is that 18-19 will mark the shift to a longer term decline which will become obvious when we look back in time 10 to 20 years into the future. Recent 7 year snowfall through 2025 compared to past lowest 7 year stretches. Past snow droughts were the result of too dry and not too warm. This is an important distinction to now as we are experiencing too much warmth for snow. Since in the old days there was always enough cold once the snow droughts ended due to dry conditions ended. Like we saw in the earky 1930s with record cold and snow in 33-34. Also from the late 1950s into early 1960s with the very snowy and cold conditions following those 7 year snowfall through droughts. New Brunswick……2025…..15.9”…….1956……13.8”………1932…..13.8” Trenton…..2025…..14.1”…….1933…..14.2” Philly………2025…..10.5”……1932…..12.3”

More early season mid 80s heat for the warm spots today as we are off to the 3rd and 4th warmest spring on record from Newark out to Islip. Hopefully, we can actually verify some heavy rains out of the cutoff low forecast. This has some potential to reduce the drought a bit. But it’s going to be a challenge to completely make up the 10 inch deficit since last summer over NJ and Eastern PA. But a 25% to 50% reduction would be good news. Since drought feedback going into the summer would result in a very hot summer especially in areas away from the sea breeze. So we will need another 2 or 3 potential big event like this to push back in the heat potential this summer. Since the only way we have seen summer heat in recent years get reduced some has been through very heavy rains like in 2023. But that was a developing El Niño. La Ninas often have cutoffs in May but transition to drier conditions over the summer. I would be nice to see a wetter pattern hold into the summer. Maybe the Euro seasonal release on the 5th will have some clues. Time Series Summary for NEWARK LIBERTY INTL AP, NJ Click column heading to sort ascending, click again to sort descending. 1 2012-05-01 53.4 0 2 2010-05-01 53.3 0 3 1945-05-01 52.8 0 4 2025-05-01 52.2 0 5 2024-05-01 52.0 0 6 2023-05-01 51.4 0 - 1973-05-01 51.4 0 7 2016-05-01 51.0 0 - 1985-05-01 51.0 0 8 1977-05-01 50.3 0 9 2021-05-01 50.1 0 Time Series Summary for ISLIP-LI MACARTHUR AP, NY Click column heading to sort ascending, click again to sort descending. 1 2012-05-01 49.8 0 2 2010-05-01 49.5 0 3 2025-05-01 49.0 0 4 2024-05-01 48.2 0 5 2023-05-01 47.6 0 - 1973-05-01 47.6 0 6 2016-05-01 47.4 0 7 1991-05-01 47.3 0 8 2002-05-01 47.0 0 9 2021-05-01 46.7 0 10 1985-05-01 46.6 0 - 1977-05-01 46.6 0

While shorter PDO cycles in a warming climate may be a new concept to some on this forum, this has been a topic of interest in the climate community for a while now. It’s acknowledged that the decadal cycle broke down in 1998. This is why the PDO has been seeing such quick shifts from one phase to another since then. https://journals.ametsoc.org/view/journals/clim/29/16/jcli-d-15-0690.1.xml#:~:text=Abstract The impact of climate change on,in response to global warming or cooling. In the control simulations the model PDO has an approximately bidecadal peak. In a warmer climate the PDO time scale becomes shorter, changing from ~20 to ~12 yr. In a colder climate the time scale of the PDO increases to ~34 yr. Physically, global warming (cooling) enhances (weakens) ocean stratification. The increased (decreased) ocean stratification acts to increase (reduce) the phase speed of internal Rossby waves, thereby altering the time scale of the simulated PDO. https://www.fisheries.noaa.gov/west-coast/science-data/climate-and-atmospheric-indicators These decadal cycles broke down in late 1998 when the PDO entered a cold phase that lasted only five years. This cold phase was followed by a warm phase from 2003 to 2007 and an abrupt change to a cold phase from 2008 to 2013 (with a short interruption during the moderate El Niño in fall/winter 2009-2010). The PDO then switched phases again in 2014 and remained positive until 2018. This period coincided with a large marine heatwave and El Niño that negatively impacted the marine ecosystem in the NE Pacific during that time. Since 2020, the PDO has been consistently negative, reaching the most negative values since 1955 in both 2022 and 2023.

This was the 3rd warmest April on record for Long Island. Time Series Summary for ISLIP-LI MACARTHUR AP, NY - Month of Apr Click column heading to sort ascending, click again to sort descending. 1 2017 53.4 0 - 2010 53.4 0 2 2023 53.3 0 3 2025 52.8 0 4 2002 52.3 0 5 2012 52.2 0 6 1991 52.0 0 7 2019 51.9 0 8 1976 51.5 0 9 1974 51.4 0 10 2008 51.3 0

The GFS has really been struggling in recent months. So my guess is that it will eventually move toward the less progressive Euro and CMC. But not sure if it will actually be quite as wet as those 3-5” forecasts since models struggle with cutoff low locations. Will be important to watch since a wetter pattern heading into the summer could tamp down any 100° heat potential for NJ and push back against a 2022 repeat.

The graph you posted doesn’t take into account the SST changes I mentioned in my earlier posts which affect the calculations. Plus the study I posted about the recent shift. Model forecasts show the duration of the PDO phases becoming more erratic as the climate continues to warm.

The PDO actually shifted during those years which is an undeniable fact. So there hasn’t been a continuous -PDO from 1998 to 2025 like we had from the 1950s to 1970s. So the character and duration of the PDO intervals is different from the mid to late 1900s.

It’s not a leap of faith on my part since there were studies published about the +PDO shift around 2013 to 2015 and the jump in global temperatures. Initialized decadal prediction for transition to positive phase of the Interdecadal Pacific Oscillation https://www.nature.com/articles/ncomms11718 The negative phase of the Interdecadal Pacific Oscillation (IPO), a dominant mode of multi-decadal variability of sea surface temperatures (SSTs) in the Pacific, contributed to the reduced rate of global surface temperature warming in the early 2000s. A proposed mechanism for IPO multidecadal variability indicates that the presence of decadal timescale upper ocean heat content in the off-equatorial western tropical Pacific can provide conditions for an interannual El Niño/Southern Oscillation event to trigger a transition of tropical Pacific SSTs to the opposite IPO phase. Here we show that a decadal prediction initialized in 2013 simulates predicted Niño3.4 SSTs that have qualitatively tracked the observations through 2015. The year three to seven average prediction (2015–2019) from the 2013 initial state shows a transition to the positive phase of the IPO from the previous negative phase and a resumption of larger rates of global warming over the 2013–2022 period consistent with a positive IPO phase.