donsutherland1

Recently, Seattle experienced its third extreme heat event (methodology from Clarke et al., 2014) in the past two years. Embedded in that extreme heat event was that city's longest heatwave on record. The extreme heat event and heatwave occur at a time when Seattle's summers are growing warmer and the frequency of 90° high temperatures in July are increasing.

Morning thoughts… It will be partly sunny and very warm. High temperatures will reach the upper 80s and lower 90s in most of the region. Likely high temperatures around the region include: New York City (Central Park): 79° Newark: 84° Philadelphia: 86° Very warm to occasionally hot weather will continue into the weekend. Normals: New York City: 30-Year: 84.7°; 15-Year: 85.5° Newark: 30-Year: 86.2°; 15-Year: 87.4° Philadelphia: 30-Year: 87.2°; 15-Year: 87.9°

Hotter air will be returning starting tomorrow. The heat could peak this week with temperatures rising well into the 90s across the region with some spots approaching or reaching 100°. Overall, August will likely be warmer than normal. The ECMWF seasonal forecast indicates that the summer will be warmer than normal throughout the region and across much of North America. Based on how the pattern has been evolving during the spring transition to summer, it is more likely than not that the warmest anomalies of the summer will likely occur in July and August with June being the coolest of the three months in the Northeast. The latest ECMWF monthly forecast indicates that July will be warmer than June relative to normal and that August will be the warmest summer month relative to normal. In addition, in the 6 past cases when the June AO averaged +0.750 or above (1950-2021), 50% of the following July cases were warmer than normal. 67% of the following August and September cases featured above normal temperatures. The ENSO Region 1+2 anomaly was -0.9°C and the Region 3.4 anomaly was -0.7°C for the week centered around July 27. For the past six weeks, the ENSO Region 1+2 anomaly has averaged -1.18°C and the ENSO Region 3.4 anomaly has averaged -0.62°C. La Niña conditions will likely persist through the summer. The SOI was +26.28 (old record: +15.23, 2010). The preliminary Arctic Oscillation (AO) was -0.100 today. On July 29 the MJO was in Phase 3 at an amplitude of 0.608 (RMM). The July 28-adjusted amplitude was 0.609 (RMM).

Morning thoughts… Clouds and showers will slowly give way to sunshine. High temperatures will reach the upper 70s and lower 80s in most of the region. Likely high temperatures around the region include: New York City (Central Park): 79° Newark: 84° Philadelphia: 86° Hot air will return tomorrow. Normals: New York City: 30-Year: 84.7°; 15-Year: 85.6° Newark: 30-Year: 86.3°; 15-Year: 87.5° Philadelphia: 30-Year: 87.3°; 15-Year: 88.0°

A remarkable July has now concluded in Texas. Austin and San Antonio saw their third consecutive record warm month while Galveston saw its fourth. July 2022 was also Galveston’s hottest month on record.

July 2022 was tied as the 7th hottest July and 10th hottest month on record in Phoenix.

A warmer than normal July concluded today. In New York City, the monthly mean temperature was 79.5°, which was 2.0° above normal. Clouds and showers could give way to sunshine tomorrow. It will be briefly cooler before hotter air returns. Later in the week, temperatures could peak well in the 90s across the region with some spots approaching or reaching 100°. Overall, August will likely be warmer than normal. Out West, Austin and San Antonio recorded their third consecutive record warm month. Galveston registered its fourth consecutive record warm month. During June 16-20, the MJO has been in Phase 1 at an amplitude of 1.500 or above. Of the six cases that saw such an outcome during June 15-25 (1988, 2003, 2010, 2012, 2017 and 2020), four had a warmer than normal July, one was somewhat cooler than normal and one was cooler than normal. The latest guidance all indicates that July will wind up solidly among the warmer than normal cases. The ECMWF seasonal forecast indicates that the summer will be warmer than normal throughout the region and across much of North America. Based on how the pattern has been evolving during the spring transition to summer, it is more likely than not that the warmest anomalies of the summer will likely occur in July and August with June being the coolest of the three months in the Northeast. The latest ECMWF monthly forecast indicates that July will be warmer than June relative to normal and that August will be the warmest summer month relative to normal. In addition, in the 6 past cases when the June AO averaged +0.750 or above (1950-2021), 50% of the following July cases were warmer than normal. 67% of the following August and September cases featured above normal temperatures. The ENSO Region 1+2 anomaly was -1.0°C and the Region 3.4 anomaly was -0.7°C for the week centered around July 20. For the past six weeks, the ENSO Region 1+2 anomaly has averaged -1.30°C and the ENSO Region 3.4 anomaly has averaged -0.60°C. La Niña conditions will likely persist through the summer. The SOI was +28.87 (old record: +25.98, 2011). The preliminary Arctic Oscillation (AO) was -0.141 today. On July 29 the MJO was in Phase 3 at an amplitude of 0.609 (RMM). The July 28-adjusted amplitude was 0.862 (RMM).

July 2022 was Galveston's hottest month on record. It was also Galveston's 4th consecutive record warm month.

Austin and San Antonio are concluding their third consecutive record warm month. Galveston is concluding its fourth consecutive record warm month.

DCA _ NYC _ BOS __ ORD _ ATL _ IAH ___ DEN _ PHX _ SEA 1.5 2.0 2.0 1.8 1.2 0.7 0.2 0.5 1.0

Morning thoughts… Sunshine will give way to increasing clouds. High temperatures will reach the middle and upper 80s in most of the region. Likely high temperatures around the region include: New York City (Central Park): 84° Newark: 89° Philadelphia: 89° Clouds and showers will give way to some sunshine tomorrow. It will be cooler, but hot air will return on Tuesday. Normals: New York City: 30-Year: 84.8°; 15-Year: 85.7° Newark: 30-Year: 86.4°; 15-Year: 87.8° Philadelphia: 30-Year: 87.4°; 15-Year: 88.2°

July will conclude with near or above normal temperatures. Afterward, there is the potential for significant heat to expand into the region during the first week of August. Overall, August will likely be warmer than normal. Out West, Austin and San Antonio are virtually certain to record their third consecutive record warm month. Galveston is on track to record its fourth consecutive record warm month. Seattle and Portland are experiencing their second consecutive year with a concurrent extreme heat event for the first time on record. During June 16-20, the MJO has been in Phase 1 at an amplitude of 1.500 or above. Of the six cases that saw such an outcome during June 15-25 (1988, 2003, 2010, 2012, 2017 and 2020), four had a warmer than normal July, one was somewhat cooler than normal and one was cooler than normal. The latest guidance all indicates that July will wind up solidly among the warmer than normal cases. The ECMWF seasonal forecast indicates that the summer will be warmer than normal throughout the region and across much of North America. Based on how the pattern has been evolving during the spring transition to summer, it is more likely than not that the warmest anomalies of the summer will likely occur in July and August with June being the coolest of the three months in the Northeast. The latest ECMWF monthly forecast indicates that July will be warmer than June relative to normal and that August will be the warmest summer month relative to normal. In addition, in the 6 past cases when the June AO averaged +0.750 or above (1950-2021), 50% of the following July cases were warmer than normal. 67% of the following August and September cases featured above normal temperatures. The ENSO Region 1+2 anomaly was -1.0°C and the Region 3.4 anomaly was -0.7°C for the week centered around July 20. For the past six weeks, the ENSO Region 1+2 anomaly has averaged -1.30°C and the ENSO Region 3.4 anomaly has averaged -0.60°C. La Niña conditions will likely persist through the summer. The SOI was +25.24. The preliminary Arctic Oscillation (AO) was -0.165 today. On July 28 the MJO was in Phase 2 at an amplitude of 0.865 (RMM). The July 27-adjusted amplitude was 0.920 (RMM). Based on sensitivity analysis applied to the latest guidance, there is an implied near 100% probability that New York City will have a warmer than normal July (1991-2020 normal). July will likely finish with a mean temperature near 79.5° (2.0° above normal).

Temperatures will generally remain near or above normal through the remainder of the month. Afterward, there is the potential for significant heat to expand into the region during the first week of August. Overall, August will likely be warmer than normal. Out West, Austin and San Antonio are virtually certain to record their third consecutive record warm month. Galveston is on track to record its fourth consecutive record warm month. Seattle is now experiencing its third extreme heat event in the last two years and could make a run at tying or breaking its longest stretch of 90° or above days. During June 16-20, the MJO has been in Phase 1 at an amplitude of 1.500 or above. Of the six cases that saw such an outcome during June 15-25 (1988, 2003, 2010, 2012, 2017 and 2020), four had a warmer than normal July, one was somewhat cooler than normal and one was cooler than normal. The latest guidance all indicates that July will wind up solidly among the warmer than normal cases. The ECMWF seasonal forecast indicates that the summer will be warmer than normal throughout the region and across much of North America. Based on how the pattern has been evolving during the spring transition to summer, it is more likely than not that the warmest anomalies of the summer will likely occur in July and August with June being the coolest of the three months in the Northeast. The latest ECMWF monthly forecast indicates that July will be warmer than June relative to normal and that August will be the warmest summer month relative to normal. In addition, in the 6 past cases when the June AO averaged +0.750 or above (1950-2021), 50% of the following July cases were warmer than normal. 67% of the following August and September cases featured above normal temperatures. The ENSO Region 1+2 anomaly was -1.0°C and the Region 3.4 anomaly was -0.7°C for the week centered around July 20. For the past six weeks, the ENSO Region 1+2 anomaly has averaged -1.30°C and the ENSO Region 3.4 anomaly has averaged -0.60°C. La Niña conditions will likely persist through the summer. The SOI was +20.99. The preliminary Arctic Oscillation (AO) was -0.260 today. On July 27 the MJO was in Phase 2 at an amplitude of 0.928 (RMM). The July 26-adjusted amplitude was 1.189 (RMM). Based on sensitivity analysis applied to the latest guidance, there is an implied near 100% probability that New York City will have a warmer than normal July (1991-2020 normal). July will likely finish with a mean temperature near 79.5° (2.0° above normal).

It will be interesting to see if there is an attribution study. If so, these events may be covered in the same study, even as they occurred days apart.

Temperatures rose into the upper 80s and lower 90s across the region. Tomorrow will be a similar day. Temperatures will generally remain near or above normal through the remainder of the month. There is potential for significant heat to expand into the region during the first week of August. Overall, August will likely be warmer than normal. During June 16-20, the MJO has been in Phase 1 at an amplitude of 1.500 or above. Of the six cases that saw such an outcome during June 15-25 (1988, 2003, 2010, 2012, 2017 and 2020), four had a warmer than normal July, one was somewhat cooler than normal and one was cooler than normal. The latest guidance all indicates that July will wind up solidly among the warmer than normal cases. The ECMWF seasonal forecast indicates that the summer will be warmer than normal throughout the region and across much of North America. Based on how the pattern has been evolving during the spring transition to summer, it is more likely than not that the warmest anomalies of the summer will likely occur in July and August with June being the coolest of the three months in the Northeast. The latest ECMWF monthly forecast indicates that July will be warmer than June relative to normal and that August will be the warmest summer month relative to normal. In addition, in the 6 past cases when the June AO averaged +0.750 or above (1950-2021), 50% of the following July cases were warmer than normal. 67% of the following August and September cases featured above normal temperatures. The ENSO Region 1+2 anomaly was -1.0°C and the Region 3.4 anomaly was -0.7°C for the week centered around July 20. For the past six weeks, the ENSO Region 1+2 anomaly has averaged -1.30°C and the ENSO Region 3.4 anomaly has averaged -0.60°C. La Niña conditions will likely persist through the summer. The SOI was +15.63. The preliminary Arctic Oscillation (AO) was -0.147 today. On July 25 the MJO was in Phase 1 at an amplitude of 1.564 (RMM). The July 24-adjusted amplitude was 1.486 (RMM). Based on sensitivity analysis applied to the latest guidance, there is an implied near 100% probability that New York City will have a warmer than normal July (1991-2020 normal). July will likely finish with a mean temperature near 79.6° (2.1° above normal).

Temperatures will generally remain near or above normal through the remainder of the month. There is potential for significant heat to expand into the region late in the first week of August. Overall, August will likely be warmer than normal. In the Midwest, St. Louis picked up 8.64" rainfall today. That swept away the longstanding daily rainfall record of 6.85", which was set on August 20, 1915. During June 16-20, the MJO has been in Phase 1 at an amplitude of 1.500 or above. Of the six cases that saw such an outcome during June 15-25 (1988, 2003, 2010, 2012, 2017 and 2020), four had a warmer than normal July, one was somewhat cooler than normal and one was cooler than normal. The latest guidance all indicates that July will wind up solidly among the warmer than normal cases. The ECMWF seasonal forecast indicates that the summer will be warmer than normal throughout the region and across much of North America. Based on how the pattern has been evolving during the spring transition to summer, it is more likely than not that the warmest anomalies of the summer will likely occur in July and August with June being the coolest of the three months in the Northeast. The latest ECMWF monthly forecast indicates that July will be warmer than June relative to normal and that August will be the warmest summer month relative to normal. In addition, in the 6 past cases when the June AO averaged +0.750 or above (1950-2021), 50% of the following July cases were warmer than normal. 67% of the following August and September cases featured above normal temperatures. The ENSO Region 1+2 anomaly was -1.0°C and the Region 3.4 anomaly was -0.7°C for the week centered around July 20. For the past six weeks, the ENSO Region 1+2 anomaly has averaged -1.30°C and the ENSO Region 3.4 anomaly has averaged -0.60°C. La Niña conditions will likely persist through the summer. The SOI was +6.89. The preliminary Arctic Oscillation (AO) was -0.015 today. On July 24 the MJO was in Phase 1 at an amplitude of 1.485 (RMM). The July 23-adjusted amplitude was 1.419 (RMM). Based on sensitivity analysis applied to the latest guidance, there is an implied near 100% probability that New York City will have a warmer than normal July (1991-2020 normal). July will likely finish with a mean temperature near 79.6° (2.1° above normal).

Morning thoughts… It will be partly cloudy and warm. High temperatures will reach the lower and middle 80s in most of the region. Likely high temperatures around the region include: New York City (Central Park): 85° Newark: 90° Philadelphia: 88° Tomorrow will turn warmer. Normals: New York City: 30-Year: 85.0°; 15-Year: 86.1° Newark: 30-Year: 86.7°; 15-Year: 88.1° Philadelphia: 30-Year: 87.6°; 15-Year: 88.6°

Tomorrow will be partly sunny with seasonable temperatures. Temperatures will generally remain near orabove normal through the remainder of the month. There is potential for significant heat to expand into the region late in the first week of August. Overall, August will likely be warmer than normal. In the Midwest, St. Louis picked up 8.64" rainfall today. That swept away the longstanding daily rainfall record of 6.85", which was set on August 20, 1915. During June 16-20, the MJO has been in Phase 1 at an amplitude of 1.500 or above. Of the six cases that saw such an outcome during June 15-25 (1988, 2003, 2010, 2012, 2017 and 2020), four had a warmer than normal July, one was somewhat cooler than normal and one was cooler than normal. The latest guidance all indicates that July will wind up solidly among the warmer than normal cases. The ECMWF seasonal forecast indicates that the summer will be warmer than normal throughout the region and across much of North America. Based on how the pattern has been evolving during the spring transition to summer, it is more likely than not that the warmest anomalies of the summer will likely occur in July and August with June being the coolest of the three months in the Northeast. The latest ECMWF monthly forecast indicates that July will be warmer than June relative to normal and that August will be the warmest summer month relative to normal. In addition, in the 6 past cases when the June AO averaged +0.750 or above (1950-2021), 50% of the following July cases were warmer than normal. 67% of the following August and September cases featured above normal temperatures. The ENSO Region 1+2 anomaly was -1.0°C and the Region 3.4 anomaly was -0.7°C for the week centered around July 20. For the past six weeks, the ENSO Region 1+2 anomaly has averaged -1.30°C and the ENSO Region 3.4 anomaly has averaged -0.60°C. La Niña conditions will likely persist through the summer. The SOI was +7.02. The preliminary Arctic Oscillation (AO) was -0.074 today. On July 23 the MJO was in Phase 1 at an amplitude of 1.419 (RMM). The July 22-adjusted amplitude was 1.504 (RMM). Based on sensitivity analysis applied to the latest guidance, there is an implied 99% probability that New York City will have a warmer than normal July (1991-2020 normal). July will likely finish with a mean temperature near 79.7° (2.2° above normal).

No. It broke the record. The earlier extreme heat event with 5 days did not have 5 consecutive days. It had 5 days in total.

Final data for Newark's extreme heat event:

Historic rainfall is underway in St. Louis. Through 7:15 CDT, 8.09" has fallen. That smashes the daily mark of 2.24" from 2009 and all-time record of 6.85" from August 20, 1915. It has had hourly rainfall as high as 2.21", including 4 consecutive hours with 1" or more of rain.

Morning thoughts… It will be variably cloudy and cooler. High temperatures will reach the lower and middle 80s in most of the region. Likely high temperatures around the region include: New York City (Central Park): 84° Newark: 89° Philadelphia: 84° Tomorrow will be fair and pleasant. Normals: New York City: 30-Year: 85.1°; 15-Year: 86.2° Newark: 30-Year: 86.8°; 15-Year: 88.2° Philadelphia: 30-Year: 87.7°; 15-Year: 88.7°

It will be variably cloudy and somewhat cooler tomorrow. Temperatures will generally remain at or above normal through the remainder of the month. During June 16-20, the MJO has been in Phase 1 at an amplitude of 1.500 or above. Of the six cases that saw such an outcome during June 15-25 (1988, 2003, 2010, 2012, 2017 and 2020), four had a warmer than normal July, one was somewhat cooler than normal and one was cooler than normal. The latest guidance all indicates that July will wind up solidly among the warmer than normal cases. The ECMWF seasonal forecast indicates that the summer will be warmer than normal throughout the region and across much of North America. Based on how the pattern has been evolving during the spring transition to summer, it is more likely than not that the warmest anomalies of the summer will likely occur in July and August with June being the coolest of the three months in the Northeast. The latest ECMWF monthly forecast indicates that July will be warmer than June relative to normal and that August will be the warmest summer month relative to normal. In addition, in the 6 past cases when the June AO averaged +0.750 or above (1950-2021), 50% of the following July cases were warmer than normal. 67% of the following August and September cases featured above normal temperatures. The ENSO Region 1+2 anomaly was -1.2°C and the Region 3.4 anomaly was -0.6°C for the week centered around July 13. For the past six weeks, the ENSO Region 1+2 anomaly has averaged -1.40°C and the ENSO Region 3.4 anomaly has averaged -0.60°C. La Niña conditions will likely persist through the summer. The SOI was +4.92. The preliminary Arctic Oscillation (AO) was -0.612 today. On July 23 the MJO was in Phase 1 at an amplitude of 1.417 (RMM). The July 22-adjusted amplitude was 1.504 (RMM). Based on sensitivity analysis applied to the latest guidance, there is an implied 99% probability that New York City will have a warmer than normal July (1991-2020 normal). July will likely finish with a mean temperature near 79.9° (2.4° above normal).

I agree. I don't think one can automatically assume that the record streak of 100s isn't accurate. If there's an error, it's much less than the 2-3 degrees speculated upon in the article. The prior two rises in error could well have been a function of predominant wind direction.

I ran the numbers against New Brunswick and Harrison. The outcomes are similar, but I excluded Harrison, as there were too many missing values in Harrison’s record vs. 2 for New Brunswick’s. There may be an error (assuming there is no other explanation for the recent decoupling shown below), but it’s probably far closer to 0.5 degrees-1 degree than 2-3 degrees. Other explanations are plausible, thus I use “may.”