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April 2020


donsutherland1
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3 minutes ago, NJwx85 said:

If I recall last Summer was on the cool side. Wouldn't mind a hot and relatively dry Summer if we're ever allowed to leave our houses again. Would make for some great beach/shore vacation weather.

Last summer was humid and very warm! I thought summer was never going to end!

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42 minutes ago, NJwx85 said:

If I recall last Summer was on the cool side. Wouldn't mind a hot and relatively dry Summer if we're ever allowed to leave our houses again. Would make for some great beach/shore vacation weather.

It was a +1 to +2 summer across the area with a top 10 warmest July. The only recent cooler summers at  0 to -1 were 2017 and 2014. The record high dew points last several summers made it feel as warm as the warmest summers since 2010. 

Time Series Summary for NEWARK LIBERTY INTL AP, NJ - Month of Jul
Click column heading to sort ascending, click again to sort descending.
Rank
Year
Mean Avg Temperature 
Missing Count
1 2011 82.7 0
2 1993 82.5 0
3 2010 82.3 0
4 1994 81.9 0
5 2013 80.9 0
6 2012 80.8 0
- 1999 80.8 0
7 2019 80.6 0
8 1955 80.5 0
9 1988 80.4 0
10 2002 80.0 0
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Just now, bluewave said:

The whole region finished +1 to +2 with numerous top 10 warmest Julys.

67DC167D-9B22-4828-B1F4-4173E2493D3D.png.2c3ea7d286013f8bb05b2d3cd4019522.png

 

I believe you, I just don't remember it that way. I recall hot stretches but not your classic wall to wall hot and dry Summers like in the past. Summer of 1999 comes to mind.

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1 hour ago, Rtd208 said:

Yeah it looks like Thursday night into Friday afternoon we could pick up 1-2" of rain followed by this storm late Saturday into Sunday which could drop another 1-2"+. Wet times ahead for sure. You almost have to wonder if this pattern could persist into the summer and instead of very hot temps which some are mentioning we could wind up having a very warm and muggy summer with plenty of heavy rain/severe storms instead which would probably keep temps somewhat in check. We'll see.

Not again... Wasn't two wet years in a row enough? 

1 hour ago, bluewave said:

It was a +1 to +2 summer across the area with a top 10 warmest July. The only recent cooler summers at  0 to -1 were 2017 and 2014. The record high dew points last several summers made it feel as warm as the warmest summers since 2010. 

Time Series Summary for NEWARK LIBERTY INTL AP, NJ - Month of Jul
Click column heading to sort ascending, click again to sort descending.
Rank
Year
Mean Avg Temperature 
Missing Count
1 2011 82.7 0
2 1993 82.5 0
3 2010 82.3 0
4 1994 81.9 0
5 2013 80.9 0
6 2012 80.8 0
- 1999 80.8 0
7 2019 80.6 0
8 1955 80.5 0
9 1988 80.4 0
10 2002 80.0 0

 

21 minutes ago, bluewave said:

The whole region finished +1 to +2 with numerous top 10 warmest Julys.

67DC167D-9B22-4828-B1F4-4173E2493D3D.png.2c3ea7d286013f8bb05b2d3cd4019522.png

 

The caveat being that much of the warmth was due to high minimums not high maximums. 

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1 hour ago, gravitylover said:

Not again... Wasn't two wet years in a row enough? 

 

The caveat being that much of the warmth was due to high minimums not high maximums. 

The maximum July temperature departure at Newark was +3.5 vs +3.0 for the minimum. JFK came close to their all-time record heat index late in July with the record heat and humidity. There were numerous record highs on July 20th and 21st.

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2 minutes ago, Allsnow said:

I only remember one real hot stretch of weather last summer around the end of July. I remember August being overall pleasant with nice nights 

Yeah from what I remember we had some cool shots from middle to end of the month.

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This afternoon, a squall line with strong to severe thunderstorms blasted through the region. By evening, the clouds broke in parts of the region allowing for a return of bright sunshine. Nevertheless, some showers still moved across the region during the evening.

In the wake of the cold front, much colder air began pushing into the region. Tomorrow through Friday will likely see temperatures stay well below normal.

Overall, readings will likely average generally below normal to near normal with a few warmer than normal days across the Middle Atlantic and southern New England regions through most of the remainder of the month. Warmer than normal conditions could return near the end of the month or just afterward.
 
Past cases that saw the NAO average -0.750 or below during April 1-5 with warmth in the East, as occurred this month, saw the development of a trough in the East after April 10. That trough typically persisted in the means for 1-2 weeks.

Looking ahead to May, 73% of cases that saw one or more days where the NAO fell to -1.000 or below during April 1-10, 1950-2019, as was the case this April, wound up with a warmer than normal May. In addition, two-thirds of cases that saw the MJO reach Phase 8 at an amplitude of 2.000 or above during the April 5-20 period, as happened this month, saw a warmer than normal May.

The ENSO Region 1+2 anomaly was +0.1°C and the Region 3.4 anomaly was +0.7°C for the week centered around April 8. For the past six weeks, the ENSO Region 1+2 anomaly has averaged +0.55°C and the ENSO Region 3.4 anomaly has averaged +0.62°C. Neutral and occasionally warm ENSO conditions will likely prevail through mid-May. ENSO Region anomalies could begin a steady cooling during late April or May.

The SOI was +0.14 today.

Today, the preliminary Arctic Oscillation (AO) figure was -1.021. The last time the AO was at least as low was December 27, 2019 when the AO was -2.070.

On April 20, the MJO was in Phase 1 at an amplitude of 1.728 (RMM). The April 19-adjusted amplitude was 1.678.

February 2020 saw the ENSO Region 1+2 anomaly increase by more than 0.50°C. Such a development has typically occurred before a warmer than normal summer. In all such cases, a warmer than normal spring was followed by a warmer than normal summer. Therefore, a warmer than normal summer is currently more likely than not. Should Spring wind up warmer than normal, a warm or even hot summer will be very likely.

Based on sensitivity analysis applied to the latest guidance, there is an implied 90% probability that New York City will have a cooler than normal April. April will likely finish with a mean temperature near 51.5°.

 

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2 hours ago, Allsnow said:

I only remember one real hot stretch of weather last summer around the end of July. I remember August being overall pleasant with nice nights 

the biggest positive anomolies were in July for sure with close to 100 degree heat around 7/20 or so....

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