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Old 07-26-2015, 12:18 AM
 
Location: NYC
5,957 posts, read 2,697,974 times
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There's a sinkhole in northern Utah which is very effective at causing temperature inversions.

These temperature inversions are so pronounced that it can be -50C at the bottom of the valley while it's only -15C at the top of the valley.

It's responsible for the second-coldest temperature ever recorded in the contiguous US: -69F / -56C on Feb 1, 1985

https://en.wikipedia.org/wiki/Peter_Sinks

Spoiler


Peter Sinks is a natural sinkhole in northern Utah that is one of the coldest places in the contiguous United States.
Peter Sinks is located 8,100 feet (2,500 m) above sea level, in the Bear River Mountains east of Logan, within the Wasatch-Cache National Forest. Due to temperature inversions that trap cold nocturnal air, it routinely produces the coldest temperatures in the state. Even in the summer, the bottom of the sinkhole rarely goes four consecutive days without freezing. It is so cold near the bottom of the hole that trees are unable to grow.

On 1 February 1985, a temperature of −69.3 °F (−56.3 °C) was recorded there, the lowest recorded temperature in Utah, and the second coldest temperature ever recorded in the continental United States.

Peter Sinks was discovered meteorologically by Utah State University student Zane Stephens in 1983. Stephens, along with the Utah Climate Center, placed measuring instruments in the valley in the winter of 1984. On February 1, 1985, Peter Sinks dropped to −69.3 °F (−56.3 °C), while another nearby valley, Middle Sink, located 3 miles to the north-east, dropped to −64 °F (−53 °C). Stephens hiked into Middle Sink to record the temperature personally. He then flew into Peter Sinks in a KUTV television station helicopter with broadcasting Meteorologist Mark Eubank. State Climatologist Gayle Bingham also traveled to the area and confirmed the temperature. The alcohol thermometer being used was retrieved and sent to the Bureau of Standards in Washington, D.C. to confirm the temperature.

Since 1985, Peter Sinks and Middle Sink have been studied extensively by Stephens and Tim Wright with the use of Campbell Scientific weather equipment. On January 29, 2002, the temperature dropped to −62 °F (−52 °C) at Middle Sink. Stephens and Wright's main study is the change in temperature through the inversion at these sites. The valleys act like a dam trapping cold air. The coldest of the air settles to the bottom of the valley. Stephens and Wright have found that temperatures between the cold air "lake" and the warmer air above the valley can be different by as much as 70°F (39°C).


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Old 08-03-2015, 09:47 PM
 
Location: NYC
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I just found out that LaGuardia (KLGA) had a low of 83F (28C) on July 20th.

That's pretty insane for this latitude (41N) even considering UHI.

Weather History for New York, NY | Weather Underground


The highest low ever there was 86F (30C) back in 2013, on July 19:

http://www.wunderground.com/history/...lyHistory.html


Still, the most barbaric day in recent memory (July 22, 2011) had a low of only 85F (29C):

http://www.wunderground.com/history/...ic=&reqdb.wmo=

Last edited by Shalop; 08-03-2015 at 10:00 PM..
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Old 08-04-2015, 06:36 AM
B87
 
Location: Surrey/London
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13th June is the only day of the summer that has never seen a high of 30c or more!
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Old 08-16-2015, 10:42 AM
 
Location: Near the Coast SWCT
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Jan 1 to April 30, 2015 Bridgeport, CT was coldest on record.
Jan 1 to May 31 BDR was 5th coldest on record.
Jan 1 to June 30 BDR was 7th coldest
Jan 1 to July 31 BDR was 12th coldest.

So now August will set us back even more being above normal but probably stay within Top 20. Still have 4 more months in the year to be below normal and either stop the trend up or drop us back into Top 10 maybe? We'll see where we end up.
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Old 08-16-2015, 05:00 PM
 
Location: White House, TN
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Between September 9 and 18, 2014, Barrow, AK stayed in the 33-38 F / 1-3 C range exclusively.
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Old 08-18-2015, 07:03 PM
 
Location: Near the Coast SWCT
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Last 4 days the max temps have been 6+ above normal.

Its the first time since end of May we had 4 in a row like that. In fact its the only 2 times this year.

Other times were 1 , 2 , or 3 days in a row then a break..
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Old 08-19-2015, 05:59 AM
 
Location: Near the Coast SWCT
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Cheating a little with this month since there are 13 days left but right now it's tied for warmest August at BDR.

May was 2nd warmest.
March 3rd coldest.
February was coldest and by a HUGE margin vs 2nd coldest.. Charts look nuts for February.

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Old 08-19-2015, 06:18 AM
nei nei won $500 in our forum's Most Engaging Poster Contest - Thirteenth Edition (Jan-Feb 2015). 

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Location: Western Massachusetts
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Interesting. Our average for August has been 2.3°F above normal so far but not record breaking — August 6 to 14 was slightly below average mainly from cooler than usual mins.
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Old 08-19-2015, 09:45 AM
 
Location: Near the Coast SWCT
76,674 posts, read 61,690,559 times
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Hmm, not really a "stat" but sure is interesting...

Did a little search... Last 2 times I found an Upper Low over the Plains-Midwest were May 10th & April 21st both produced late season snows. Most of the ULL's were in east last Winter.

First.... Current 500mb, Radar & Satellite on left. Upper Low over MN today, It produced early Season snows above 7000' Colorado and Wyoming for few areas this morning..



Here's May 10th. Big surface snowstorm



Here's April 21st.



Question is... will these Polar Vortex's shift to the East again for Fall and winter? And just imagine if todays happened next month. Would be hearing about more snowfall for sure...and frost/freezes.
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Old 08-19-2015, 10:57 AM
 
Location: Norman, OK
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The snowiest month on record for Norfolk, VA hit 80 three times.

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