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September 2013 Observations And Discussions


sutherlandfan

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You're probably right.  I think sep will be volatile, given that's been the case all summer with a lack of any teleconnetic signal.  First week looks warm, then we will probably go cool, then normal.

 

I kind of wonder if model performance was at an all time low for this summer.

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May be a bit off-topic, but does anyone know why we seem to have a spike in record highs at end of August/early September, compared with third week of August? For KNYC for example, the record for August 24 is 94 (and there are a bunch of 92's) but 1953, 1973, 1983 and 2010 feature some upper 90's (talking 97,98, 99 and a few 100+'s) in that band.

 

Thoughts?

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May be a bit off-topic, but does anyone know why we seem to have a spike in record highs at end of August/early September, compared with third week of August? For KNYC for example, the record for August 24 is 94 (and there are a bunch of 92's) but 1953, 1973, 1983 and 2010 feature some upper 90's (talking 97,98, 99 and a few 100+'s) in that band.

 

Thoughts?

 

Global warming is most effective in the first and last weeks of every month.

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September climate stats for NYC...
September decade averages...
Decade...ave temp...rainfall...ave max...ave min...
1870's......65.3......3.41"............................
1880's......66.2......4.18"......86.5......46.1
1890's......67.7......3.38"......89.6......47.0
1900's......68.1......3.84"......86.8......48.4
1910's......66.8......3.09"......89.5......45.6
1920's......67.8......3.54"......91.1......47.2
1930's......68.7......5.15"......90.0......47.9
1940's......68.8......3.70"......91.2......45.5
1950's......68.3......2.36"......89.9......45.6
1960's......67.7......3.85"......90.2......47.2
1970's......68.3......4.73"......90.1......47.1
1980's......68.6......3.58"......90.3......47.5
1990's......68.0......4.18"......88.7......47.6
2000's......68.6......4.91"......86.5......49.7

2010's.....70.0.......5.81"......91.0......52.7

1870-
2009........67.8......3.85"......89.2......47.1
1980-
2009........68.4......4.22"......88.5......48.3

Warmest..........Coolest..........Wettest............Driest...
73.6 in 1961...60.8 in 1871...16.85" in 1882...0.21" in 1884
73.3 in 1881...61.8 in 1887...11.96" in 1934...0.29" in 1914
73.3 in 2005...62.6 in 1883...11.51" in 2004...0.41" in 1885
72.3 in 1931...62.8 in 1888...10.30" in 1944...0.48" in 2005
72.3 in 1959...63.1 in 1963...10.09" in 1933...0.51" in 1941
72.2 in 1891...63.3 in 1893.....9.39" in 2011...0.60" in 1948
72.1 in 1921...63.3 in 1879.....9.32" in 1975...0.62" in 1895
72.0 in 1930...63.6 in 1917.....9.02" in 1938...0.70" in 1951
71.8 in 1983...63.7 in 1876.....8.82" in 1966...0.97" in 1881
71.8 in 1884...63.9 in 1918.....8.81" in 1999...1.10" in 1953

Hottest temp......Coolest temp...
102 9/02/1953....39 9/30/1912
101 9/07/1881....40 9/30/1888
..99 9/03/1929....40 9/25/1887
..99 9/11/1931....40 9/24/1963
..99 9/11/1983....40 9/21/1871

Warmest monthly minimum...
57 in 1910
56 in 1921
54 in 2002
54 in 1982
54 in 1960
54 in 1891
54 in 2010
Coldest monthly max...
79 in 1883
80 in 1888
80 in 2003
81 in 1908
81 in 1918
81 in 1975
Warmest daily minimum...
79 9/07/1881
79 9/02/1898
78 9/03/1898
78 9/04/1898
78 9/11/1983
78 9/02/2010
Coolest daily max...
52 9/30/1888
52 9/24/1887
53 9/19/1875
53 9/24/1950
53 9/25/1879
53 9/28/1984
53 9/29/1888
...............................................................

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Yeah, it's looking a bit warm from Mid Month.

 

The Euro weeklies are showing the Western Atlantic Ridge at least building back to around the Canadian Maritimes

and possibly Eastern New England during the month. So I would guess that the temperature departure here 

will be near normal to slightly above.

 

http://www.accuweather.com/en/weather-blogs/anderson/weather-pattern-update-through-the-end-of-september/17222475

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The Euro weeklies are showing the Western Atlantic Ridge at least building back to around the Canadian Maritimes

and possibly Eastern New England during the month. So I would guess that the temperature departure here 

will be near normal to slightly above.

 

http://www.accuweather.com/en/weather-blogs/anderson/weather-pattern-update-through-the-end-of-september/17222475

GFS was showing this as well

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The first half of the month will likely average near to below normal given current projections. A series of s/w troughs may amplify southeastward into New England from the middle of next week through the 10th-15th. Beyond that time frame we'll probably see heights rise and warm back up for the second half of the month. At this point I'm not seeing an absolute torch or major cold September; we'll likely fall within the -1 to +1 range for temp departures.

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The first half of the month will likely average near to below normal given current projections. A series of s/w troughs may amplify southeastward into New England from the middle of next week through the 10th-15th. Beyond that time frame we'll probably see heights rise and warm back up for the second half of the month. At this point I'm not seeing an absolute torch or major cold September; we'll likely fall within the -1 to +1 range for temp departures.

Guidance seems mixed but agree we shoud see temps near normal overall (mix of some warm/cooler days) the first week to 10 days before more sustained ridging between the 10th and 15th as we see the western atlantic ridge build back west.

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