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May 2016 Discussion/Observations


dmillz25

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They might need to lower the criteria for what constitutes a severe thunderstorm around here in the same fashion that the criteria for a blizzard was made easier to achieve (once upon a time, temperatures under 20 F were required; under 10 F for a "severe blizzard")...NOAA eliminated that requirement during the 1980's as it was hardly ever being met east of the Mississippi and south of the Great Lakes...despite some pretty prodigious snowstorms combined with wind.

The same applies with severe thunderstorms. Along the immediate Atlantic Coast, if you have one day with hail a summer, it is considered close to an average hail season...and a severe t-storm not only requires hail; but also hail breaching a specified diameter.

No. 58 mph gusts and/or 1" hail.

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Unless the GFS is off its rocker it looks like next weeks rainfall may not come to fruition as it now keeps the precip. south of the area for the 3rd run in a row.

Most rainfall evenst have underperformed or dissipated on the models as we moved closer the last two months so I would be cautious of jumping on any rain trains

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One thing is for certain, the first week of May this year will get off to a much cooler

start than last May which ran +6.1 on the month. The strong blocking pattern to

start this May will feature cooler temps than the +7.1 first week of May 2015.

 

 

 

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some May stats for NYC...the 2010's are averaging well above average along with the monthly minimums...

Average Temperature and precipitation...
decade....temp...high...low.....max/min temp ave/max/min/90+days/ ave precipitation...
1870's....60.3...63.3...58.8....................................................2.......2.50"
1880's....61.3...67.9...56.6......96......35......87.2......40.9.........6.......3.07"
1890's....60.8...67.0...57.8......96......32......85.7......41.6.........6.......3.67"
1900's....60.7...63.4...56.2......90......37......86.6......41.5.........2.......3.41"
1910's....61.5...65.3...54.3......95......36......86.8......41.7.........4.......3.39"
1920's....60.2...64.6...57.3......93......37......84.2......41.5.........2.......3.59"
1930's....63.0...64.9...59.9......96......40......90.5......43.5.......19.......3.23"
1940's....62.5...67.0...59.2......96......35......88.8......42.7.........8.......4.52" trace of snow in 1946
1950's....61.9...66.4...58.7......94......38......87.2......41.7.........6.......3.29"
1960's....62.2...66.4...55.2......99......36......88.3......41.6.......11.......3.02"
1970's....62.7...65.8...59.5......94......36......89.0......41.1.......10.......5.00" trace of snow in 1977
1980's....63.6...66.0...60.2......97......41......88.0......43.7.......10.......4.39"
1990's....62.7...68.7...59.4......96......40......89.4......44.0.......11.......4.16"
2000's....62.2...65.2...58.7......93......41......86.2......43.4.........8.......3.66"
2010's....65.0...68.5...62.8......92......41......89.0......45.8.........3.......4.62" 2010-15
1870-
2009......61.8...65.9...58.0.........................87.5......42.2.........8.......3.64"
1980-
2009..... 62.8...66.6...59.4.........................87.9......43.7.......10.......4.07"

warmest.........coolest...........wettest............driest......
68.7 in 1991...54.3 in 1917...10.24" in 1989...0.30" in 1903
68.5 in 2015...55.2 in 1967.....9.74" in 1984...0.34" in 1887
67.9 in 1880...55.2 in 1907.....9.15" in 1978...0.57" in 1964
67.0 in 1944...56.6 in 1882.....9.10" in 1990...0.62" in 1880
67.0 in 1896...57.3 in 1924.....8.51" in 1908...0.72" in 1905
66.4 in 1965...57.4 in 1901.....8.39" in 1972...0.89" in 1939
66.4 in 1959...57.7 in 1869.....8.00" in 2013...0.95" in 1877
66.0 in 1986...57.8 in 1891.....7.61" in 1940...1.05" in 1935
65.8 in 1975...58.0 in 1888.....7.58" in 1948...1.09" in 1899
65.7 in 1993...58.2 in 1893.....7.06" in 1968...1.18" in 1944

warmest temperatures...
99 5/19/1962
97 5/29/1969
97 5/30/1987
96 5/20/1996
96 5/22/1941
96 5/27/1880
96 5/29/1987
96 5/31/1895
95 5/25/1880
95 5/26/1880
95 5/27/1914
coldest temperatures...
32 5/06/1891
34 5/05/1891
35 5/01/1880
35 5/09/1947
36 5/11/1913
36 5/10/1966
36 5/10/1947
36 5/09/1977
36 5/03/1874
36 5/01/1876
coldest max days...
43 5/3/1873
43 5/5/1891
44 5/7/1967
44 5/5/1917
44 5/9/1977
45 5/1/1917
45 5/2/1962
45 5/5/1978
45 5/6/1891
46 5/25/1967+
warmest min. days...
76 5/31/1987
75 5/31/1895
74 5/09/2000
74 5/20/1996
74 5/27/1908
74 5/29/1969
74 5/30/1987
73 5/25/1880
73 5/28/1959
73 5/30/1986+



Warmest monthly minimum...
49 in 2012
49 in 1982

49 in 2013
48 in 1899
48 in 1910
47 in 1942
47 in 1944
47 in 1969
47 in 1991
46 in 2011
46 in 2000
46 in 2014 + =plus other years...
coldest monthly maximum...
75 in 1924
79 in 2005
79 in 2003
79 in 1983
79 in 1928
79 in 1927
79 in 1915
80 in 1968
80 in 1882

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bluewave, on 27 Apr 2016 - 07:09 AM, said:

One thing is for certain, the first week of May this year will get off to a much cooler

start than last May which ran +6.1 on the month. The strong blocking pattern to

start this May will feature cooler temps than the +7.1 first week of May 2015.

 

attachicon.gifecmwf-ens_z500a_nhem_9.png

Last May already had 5 days into the mid 80's by the 12th.

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Last May already had 5 days into the mid 80's by the 12th.

 

Yeah, NYC narrowly missed the warmest May on record.

 

It will be interesting to see when Newark reaches 90 for the first time this year.

 

First 90 of season for Newark since 2010:

 

5/25/15....90 

6/17/14....91

5/30/13....93

5/28/12....91

5/30/11....92

4/7/10......92

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Be interesting to see if the post 120hr Euro is too strong with that low again as the other guidance isn't as deep.

But we have a few days to see if the Euro comes in weaker or the other models get stronger. In any case,

it looks like a cool first week of May with the strong omega blocking pattern and trough in the East.

Yep looks like we are going to be in the murk this week. It's been a while since we had this type of pattern in spring.

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Yep looks like we are going to be in the murk this week. It's been a while since we had this type of pattern in spring.

 

The blocking really kicked in in late March and continues to roll right into early May.

It has been the main thing standing in the way of more record heat like we saw in

early March.

 

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This whole year so far has been a battle between the strong blocking over the Arctic

and the Western Atlantic Ridge. January and February featured the Arctic blocking

dominating the pattern with our blizzard and follow up storms. The blocking weakened

in March so the WAR was able to rebound and produce one of the warmest Marches

on record. The blocking returned in April so the temperatures were closer to normal.

We will need to see the WAR flex its muscles again to get back into a warmer pattern.

 

 

 

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This whole year so far has been a battle between the strong blocking over the Arctic

and the Western Atlantic Ridge. January and February featured the Arctic blocking

dominating the pattern with our blizzard and follow up storms. The blocking weakened

in March so the WAR was able to rebound and produce one of the warmest Marches

on record. The blocking returned in April so the temperatures were closer to normal.

We will need to see the WAR flex its muscles again to get back into a warmer pattern.

 

attachicon.gifJF.gif

 

attachicon.gifMAR.gif

 

attachicon.gifAPR.gif

shortening wavelengths will help as well

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...another day stuck in the 40's and 50's her on ELI..its been a real slow

start to spring out here..need some heat..want some heat..

any clues when this blocking will cease and get some warm temps ?..bluewave ?

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No surprise that the 0Z is now weaker and more strung out with the low pressure this week 

and cut back on the rainfall from earlier runs.  

 

old run

 

attachicon.gifOLD.png

 

new run

 

attachicon.gifNEW.png

 

The Euro has become horrible since the upgrade, clearly not the same model it once was. Hopefully it brings back the stronger solution so we can get some good soaking rains in here.

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