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June 2020 General Discussions & Observations Thread


Rtd208

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Coney Island finally lost the sun at 4pm, T at 81, high so far.       The Morristown storm which could reach me is dying out based on the number of lightning strokes.     White Plains appears to be at the center of the action now, 4:20pm.

Finally some heavy showers here at 7:00pm-7:15pm, but mostly north of me.

As a side note, the GFS during the 7 day period July 07-13 has an average high T of 98!!! in store for us.        I warned two days ago the surface wind seemed more westerly starting the 7th.           The GFS has had manic T's in almost all its runs, showing at least one 100-Degree Day each day on one or more runs since about June 04.       Any 100 it has shown in the last 7.5 years of course was wrong.       2012 has our last 100 degree day.

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Mostly cloudy 88 dew 66 after a high of 92.

A few distant rumbles of thunder, but saw some dramatic lightning strikes looking north. Was briefly on the roof but then got the hell off. Also looks very ominous looking toward Westchester while some sun shines looking toward LGA.

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11 minutes ago, uofmiami said:

2020 never fails to impress, just crazy. 

Not done yet. Imagine a winter storm with the rain changing to snow line moving from the southeast to the northwest, starting in the ocean. Im not even sure if that’s possible than again 104 in the land of the midnight sun .... As always....

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New York City saw its second 90° day of the month and year today. A few parts of the region experienced strong thunderstorms during the afternoon and early evening hours.

A predominantly warmer than normal pattern will likely persist through at least July and August, paving the way for a warmer than normal summer throughout the region. Occasional short-lived cool shots remain possible Initially, extreme heat is unlikely, but that could change during July, especially if the emerging drought continues to deepen. One or more heatwaves are likely in July across the region.

The CFSv2, which has now moved into its skillful range for its monthly forecasts, and the EPS weeklies favor a warmer than normal July across the region.

The ENSO Region 1+2 anomaly was -0.5°C and the Region 3.4 anomaly was -0.4°C for the week centered around June 17. For the past six weeks, the ENSO Region 1+2 anomaly has averaged -0.32°C and the ENSO Region 3.4 anomaly has averaged -0.43°C. Neutral-cool conditions will likely prevail through mid-summer. The probability of the development of a La Niña event during late summer or early autumn has increased in recent weeks.

The SOI was -0.70 today.

Today, the preliminary Arctic Oscillation (AO) figure was -0.657.

On June 27, the MJO was in Phase 1 at an amplitude of 1.467 (RMM). The June 26-adjusted amplitude was 1.666.

Last year, the MJO went through a very strong passage through Phase 1 during the closing days of May. About four weeks later, a warmer than normal pattern locked in and predominated through early autumn.

This year, the MJO was in Phase 1 for 3 consecutive days with an amplitude of 1.500 or above during the June 1-3 period. Since 1981, there were four such cases that saw the MJO meet or exceed those thresholds during the June 1-10 period: 2002, 2006, 2007, and 2015. While the four cases were evenly split between cooler and warmer than normal during the second half of June, 3 of those 4 cases saw a warmer to much warmer than normal July. This could be an early indication that a summer that will start with near normal temperatures overall (June) could turn warmer than normal afterward.

Last year, the SOI fell to -42.04 on June 22 when the MJO was in Phase 6. This year, the SOI plunged below -46.68 on June 5, its lowest level in more than three years. The dramatic plunge in the SOI could be the proverbial spark that kicks off a sequence of events leading to the development of a sustained warmer than normal period. Taking into consideration the MJO, that transition could begin some time during the closing 10 days of June. Further, the cases that saw both the MJO and SOI thresholds satisfied generally saw 10-20 days where the temperature reached or exceeded 90° in New York City.

Just as had been the case last year, July and August could feature warm anomalies in the East. July-August 2019 saw 13 days on which the temperature reached or exceeded 90° in New York City.

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 June. June will likely finish with a mean temperature near 73.7°.

 

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