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July 2013 Observations and Discussions


bluewave

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counting today NYC has averaged 81.7 over the last 30 days...That is one of the hottest 30 day periods on record......sixth hottest on record...

Hottest 30 day periods...

82.5 in 1980

81.9 in 1876

81.9 in 1999

81.8 in 2005

81.8 in 2010

81.7 in 2013

81.6 in 1955

81.2 in 1993

81.1 in 1995

81.1 in 1988

81.0 in 1966

81.0 in 2011

80.9 in 1983

decade average since 1930...

1930's 78.3

1940's 77.7

1950's 78.0

1960's 77.0

1970's 77.8

1980's 78.7

1990's 78.6

2000's 77.4

2010's 80.9

ave.... 78.0

2012...79.5

updated...from 6/24 to 7/23...

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The Canadian and NAM do have a decent bonified low pressure wave moving up the coast towards the end of the weak. It's not common that you see a bombing out low in the summertime unless it's of tropical origin. Should be noted that the CMC is notoriously aggressive with TC genesis and it's way more likely to see a Euro/GFS solution verify with a much weaker wave. 

 

CMC phase diagrams for fun:

 

oul2.png

 

z92.png

 

xz1f.png

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Guest Pamela

Sky looks ominous in Port Jeff at 6:35 PM...

 

The NWS cooperative at adjacent Mt. Sinai with 2.01 inches of rain over the past 5 days and more seems likely momentarily..

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Guest Pamela

The NWS cooperative at adjacent Mt. Sinai with 2.01 inches of rain over the past 5 days and more seems likely momentarily..

 

Torrential downpour in progress here....there is never a lack of rain in this town.

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Guest Pamela

The NWS cooperative at adjacent Mt. Sinai with 2.01 inches of rain over the past 5 days and more seems likely momentarily..

 

Mt Sinai reporting 0.40" rain from the storms moving through so far.

 

Edit: Now at 0.91".

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it's the UHI

sort of

 

"Analysis by Bornstein and LeRoy (1990) has shown that New York City (NYC) affects both summer daytime thunderstorm formation and movement. During conditions with nearly calm regional flows, the NYC UHI initiated convective activity, thus producing a radar echo frequency maximum over the City. Moving thunderstorms, however, bifurcated and moved around the city due to a building-barrier-induced divergence effect. During such conditions, radar echo maxima were thus produced on both lateral edges of the City and downwind of the city, while a minimum was located over the city itself. 

 
The downwind maximum associated with moving convective storms is consistent with results from the classic METROMEX field study, which also showed a precipitation maximum downwind of St. Louis (Changnon, 1981). It is also consistent with the convective precipitation study of Selover (1997), which showed that moving summer convective storms over Phoenix, Arizona produce a precipitation minimum over the city in conjunction with surrounding lateral and downwind maximum values."
 
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