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April 2020


donsutherland1
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2 minutes ago, Allsnow said:

Enjoy! Im glad to just put this horrific winter behind us. I don’t think @donsutherland1 has had a positive news all winter/spring long lol

Yeah it was brutal. Saw more snow in the past 2 weeks than I did all summer. Ready for 70° and sun but at this rate looks like we'll just jump to 85° and humid.

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Seasonal lag is a PITA. Can you imagine how much better off we’d be if Spring behaved more like Fall? Fall weather (in reverse) + the stronger sunshine would be a dramatic improvement over this confused tepid mess of a season.

Currently 40 degrees (and dropping) in the middle of the day, today’s max sun angle is over 60 degrees, elevation is close to sea level. Ridiculous.

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The strong -NAO/-EPO pattern was the only thing able to suppress the SE Ridge this month. The record winter warmth into March pushed the Atlantic and Gulf SST’s to all-time record warmth for this time of year. We have seen in recent years how persistent these spring -NAO patterns have been.
 

72D47425-8B4F-41A2-B1DF-39D9E3653005.gif.6106e0d2349016691f4eeb0d41c07845.gif

 

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21 minutes ago, donsutherland1 said:

I wish there were positive news. This was a horrible winter beyond description.

Remarkable how that tiny cold departure over the Rockies allowed for snowiest season on record in Boulder.

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I was wrong about Boston and SNE in general with the storm last night. The prior airmass was too warm and it took way too long to transition to snow, and when it did so it took too long to stick. Precip also didn’t seem as heavy as models had it. I guess our luckier streak with April events lives on for now. Last night was decent in the really hilly parts of MA and CT. 

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1 hour ago, JustinRP37 said:

God if I could avoid March 15-May15th every year I'd be one happy person. Love winter, love summer, tolerate fall, but absolutely hate spring in the northeast. 

Lately with the blocking showing up in Spring it's led to some crappy periods. 

But it's not always like this, SNE gets shafted way more than we do usually. The coming period has a mix of good and bad days.

Prolonged warmth above 70F will hold off for now though. Too bad given warm weather & humidity would help kill off the virus as well as get us outdoors which would help even more. 

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1 hour ago, Ericjcrash said:

They have a month to go too...

No they don't, that's just to their west in the mountains, Boulder isn't in the mountains. This is such a fluke that's happening right now. Cold air can happen pretty much any time as air sinks down off the 12k+ mountains but snow rarely happens on the Front Range from here on out.

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15 minutes ago, gravitylover said:

No they don't, that's just to their west in the mountains, Boulder isn't in the mountains. This is such a fluke that's happening right now. Cold air can happen pretty much any time as air sinks down off the 12k+ mountains but snow rarely happens on the Front Range from here on out.

Wrong. They average almost 3" in May.

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16 minutes ago, gravitylover said:

No they don't, that's just to their west in the mountains, Boulder isn't in the mountains. This is such a fluke that's happening right now. Cold air can happen pretty much any time as air sinks down off the 12k+ mountains but snow rarely happens on the Front Range from here on out.

Also have had a 26+" May.

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51 minutes ago, jm1220 said:

I was wrong about Boston and SNE in general with the storm last night. The prior airmass was too warm and it took way too long to transition to snow, and when it did so it took too long to stick. Precip also didn’t seem as heavy as models had it. I guess our luckier streak with April events lives on for now. Last night was decent in the really hilly parts of MA and CT. 

Logan storm total 0.7 

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1 hour ago, SnoSki14 said:

Lately with the blocking showing up in Spring it's led to some crappy periods. 

But it's not always like this, SNE gets shafted way more than we do usually. The coming period has a mix of good and bad days.

Prolonged warmth above 70F will hold off for now though. Too bad given warm weather & humidity would help kill off the virus as well as get us outdoors which would help even more. 

Yeah, but even in our best of springs, it is still very gloomy for April. I tend to always try to take a vacation at least in March to sunshine. Few years ago for our baby moon we had an awesome trip to San Diego, Palm Springs, and Phoenix for 10 days. Oh to go back to those days. Seriously though was looking for jobs out that way before the coronavirus struck, need a change of scenery. 

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this winter was as bad as 1997-98 and the el nino was not nearly as strong as 98...1972-73 was a lot colder than this year and 1997-98...I put it in third place but its close to a three way tie...2001-02 a close fourth...2011-12 was fifth...2001-02 and 2011-12 had a snowfall of at least 3" that stuck around for a few days...

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2 hours ago, Ericjcrash said:

Wrong. They average almost 3" in May.

An inch here, an inch there but not 17 at a time, at least not more than once every 20 or so years. In my mind that makes it pretty rare. Like us getting an Easter 1982 snowstorm that shuts Long Island down or the 17" in a few hours April Fools 1997 storm. 

2 hours ago, Ericjcrash said:

Also have had a 26+" May.

Yes it happens but very rarely. A 32" week like this one, in the spring is anomalous. 

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5 hours ago, bluewave said:

The strong -NAO/-EPO pattern was the only thing able to suppress the SE Ridge this month. The record winter warmth into March pushed the Atlantic and Gulf SST’s to all-time record warmth for this time of year. We have seen in recent years how persistent these spring -NAO patterns have been.
 

72D47425-8B4F-41A2-B1DF-39D9E3653005.gif.6106e0d2349016691f4eeb0d41c07845.gif

 

Must be all the melt water from the Greenland ice causing that persistent cold pool there. And therefore assisting this crazy persistent NAO pattern. 

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38 minutes ago, jm1220 said:

Must be all the melt water from the Greenland ice causing that persistent cold pool there. And therefore assisting this crazy persistent NAO pattern. 

Yeah, a combination of the slowing AMOC and stronger +NAO. 
 

https://noc.ac.uk/news/changes-ocean-circulation-cause-largest-freshening-event-ne-atlantic-120-years

Changes in ocean circulation cause largest freshening event in NE Atlantic in 120 years

Posted: 29 January 2020 
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A change in the routing of fresh water coming from the Arctic has led to a remarkable reduction in salinity in the North Atlantic Ocean west of the UK, according to research published this week in Nature Communications.

An enormous area between UK and Iceland had record-breaking low salinity at the surface by 2016 – the lowest since records began in 1895.

Lead author, Professor Penny Holliday from the National Oceanography Centre (NOC), said “This is the first time the physical process causing this reduction in salinity has been identified. This helps us build a picture of the factors influencing environmental conditions, including looking to see whether existing models can reproduce it.”

“We care about the environmental conditions because they can impact ecosystem health, and knowing how things are changing is a key step towards managing our marine resources sustainably.”

Led by NOC scientists and co-authored by the Scottish Association for Marine Science (SAMS), this study shows that in 2012 to 2016 unusual wind patterns forced Arctic fresh water carried by the Labrador Current away from the eastern North American continental shelf. The cold, fresh water was directed into the North Atlantic Current which carried it towards the UK and Iceland.

An unexpected and rapid decrease in salinity, known as the ‘North Atlantic fresh blob’ developed while the region was also cooling and developing a feature known as the ‘North Atlantic cold blob’.

Recent research has suggested that the ‘cold blob’ was caused by a combination of high heat loss from the ocean surface to the atmosphere and by a slow-down of a large-scale system of ocean currents carrying heat northwards, referred to the Atlantic Ocean Atlantic Meridional Overturning Circulation (AMOC).

This new study emphasises the importance of changes in the local currents of the subpolar region, and in particular in the pathways of fresh water from the Arctic, in changing the environmental conditions of the North-East Atlantic Ocean.

The change in the pathway of the Arctic water carried by the Labrador Current has implications for the North West Atlantic too; the regions that were receiving the cold, fresh and nutrient-rich Arctic water before 2012 include the Gulf of Maine, which has experienced damaging marine heatwaves and high salinity in recent years.

Professor Penny Holliday explains “Changes in environmental conditions in the eastern North Atlantic and in the Gulf of Maine have recently been attributed to changes in the AMOC and local heat loss. This new study shows the importance of winter wind patterns and local ocean circulation changes in determining the fate of Arctic waters and the subsequent environmental change.”

These findings used long-term data sets from on-going research expeditions in the North Atlantic, such as along the Extended Ellett Line, or the OSNAP programme.

This research forms part of the Blue-Action project, which aims to understand and simulate links between the Arctic and the global climate system, and the Arctic’s role in generating weather patterns associated with hazardous conditions and climatic extremes.

 

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