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July 2022


bluewave
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Pretty good agreement between the Euro and GFS on the major heat lasting through at least Sunday. The wildcard for Monday will be the timing of the cold front and severe storms. If the front slows down, then we can tack another day onto the major heatwave. 850 mb temperatures rise to around +20C from Wednesday into Saturday. So the warm spots could easily make a run on 100°. The Euro and GFS have 850 mb temperatures peaking at +22C to +24C by Sunday. This means that places that haven’t reached 100° since 2010-2013 could do it on Sunday. 
 

Euro 21z Wednesday 

DA088F2D-A9E1-401C-93B2-FA292978DA74.thumb.png.8994a7297335229d22372784bda6cdc6.png
 

21z Sunday 


C1B5C021-82E8-40AF-A373-D223777D1B28.thumb.png.029ad0342ed52afb37ca4e8f76fa8c04.png

 

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Despite the frontal passage, the warm and humid air mass remains in
place as heights climb and ridging builds Friday into the weekend.
Guidance has 850mb temps in the low 20s(C) by Sunday, which would
translate to surface Ts in the upper 90s if it were to verify. In
fact, 13z NBM probs have a 20% chance of Central Park hitting 100F
on Sunday. While this is unlikely, it does indicate a possibility of
an even hotter air mass over the weekend
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16 minutes ago, uncle W said:

the summer is behaving like the winter by starting slowly but picking up speed mid January as the summer started out slowly and is hot now...if the trend continues August wont be as hot like February wasn't as cold...one can only hope...

The cold January this year was the one outlier from our new climo since 2010. December was the warmest departure month of winter as usual. The record heat at the end of May matched the typical highest departure month of spring. The slow start to summer in June for most was right on also. Now the expected big July warm up right on cue. The August departure should be higher than June was. Then our classic endless summer pattern in September. 

 

The monthly temperature increases from 81-10 to 91-20 

……….EWR…..ISP

Dec…+1.5….+1.5

Jan….+1.2…+1.3

Feb….+0.5….+0.5

 

Mar….+0.4….+0.6

Apr….+0.5…..+0.6

May...+0.6….+0.9

 

Jun….+0.3….+0.6

Jul…..+1.4…..+1.1

Aug...+0.6….+0.9

 

Sep….+1.0….+1.3

Oct…..+0.9..+1.4

Nov….+0.2..+0.5

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43 minutes ago, bluewave said:

The cold January this year was the one outlier from our new climo since 2010. December was the warmest departure month of winter as usual. The record heat at the end of May matched the typical highest departure month of spring. The slow start to summer in June for most was right on also. Now the expected big July warm up right on cue. The August departure should be higher than June was. Then our classic endless summer pattern in September. 

 

The monthly temperature increases from 81-10 to 91-20 

……….EWR…..ISP

Dec…+1.5….+1.5

Jan….+1.2…+1.3

Feb….+0.5….+0.5

 

Mar….+0.4….+0.6

Apr….+0.5…..+0.6

May...+0.6….+0.9

 

Jun….+0.3….+0.6

Jul…..+1.4…..+1.1

Aug...+0.6….+0.9

 

Sep….+1.0….+1.3

Oct…..+0.9..+1.4

Nov….+0.2..+0.5

that doesn't include the lack of thunder storms until recently and snowfall that was basicly in January only...

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1 hour ago, uncle W said:

the summer is behaving like the winter by starting slowly but picking up speed mid January as the summer started out slowly and is hot now...if the trend continues August wont be as hot like February wasn't as cold...one can only hope...

I haven't looked into it but I think that was a regional thing rather than a larger scale setup. It would be interesting to see if there's a similar delay in the seasonal changes elsewhere. 

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The longest heatwave so far this summer is developing. The hottest temperatures will likely be west of New York City in adjacent New Jersey where temperatures could peak in the upper 90s and perhaps reach or exceed 100° at the height of the heatwave.

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 -0.43. The SOI was negative for the third consecutive day. The last time that happened was February 13-16, 2022 when the SOI was negative for four consecutive days.

The preliminary Arctic Oscillation (AO) was -0.621 today.

On July 17 the MJO was in Phase 4 at an amplitude of 0.734 (RMM). The July 16-adjusted amplitude was 0.960 (RMM).

Based on sensitivity analysis applied to the latest guidance, there is an implied 90% probability that New York City will have a warmer than normal July (1991-2020 normal). July will likely finish with a mean temperature near 79.8° (2.3° above normal).

 

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