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September 2018 Discussions & Observations Thread


Rtd208

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29 minutes ago, LibertyBell said:

That's amazing that all these records are so recent.  One of these years we'll see a day like that in the middle of winter!

Great, I’d hoped by that time my ashes/dust would get high enough to help in the formation of frozen precipitation. I’d have finally made a meaningful contribution to the forum. Instead I’ll be fertilizing January tulips. 

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13 minutes ago, LIWeatherGuy29 said:

The storm skipped over Southern Nassau County.

Ummm, is this a surprise? It wasn’t a big deal anyway at least on the UWS. Just a few minutes of heavy rain, barely any wind or lighting. Just a typical early fall cold frontal passage. 

I do remember a squall line growing up around this time of year that caused some tree damage. Maybe early 90s. So it can happen.   

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19 minutes ago, LongBeachSurfFreak said:

Ummm, is this a surprise? It wasn’t a big deal anyway at least on the UWS. Just a few minutes of heavy rain, barely any wind or lighting. Just a typical early fall cold frontal passage. 

I do remember a squall line growing up around this time of year that caused some tree damage. Maybe early 90s. So it can happen.   

I'm not surprised. The south shore had a good soaking yesterday so I'm not complaining :)

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Another record high minimum.

OKX issues Record Event Report (RER) at Sep 27, 7:34 AM EDT ...RECORD HIGH MINIMUM TEMPERATURE SET AT LAGUARDIA NY...mesonet.agron.iastate.edu/p.php?pid=2018…
 
OKX issues Record Event Report (RER) at Sep 27, 7:31 AM EDT ...RECORD HIGH MINIMUM TEMPERATURE SET AT ISLIP NY...mesonet.agron.iastate.edu/p.php?pid=2018…
 
Minimum temperature departures through 9- 26:
 
LGA....+5.9
ISP....+6.6

 
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10 minutes ago, bluewave said:

Another record high minimum.

OKX issues Record Event Report (RER) at Sep 27, 7:34 AM EDT ...RECORD HIGH MINIMUM TEMPERATURE SET AT LAGUARDIA NY...mesonet.agron.iastate.edu/p.php?pid=2018…
 
OKX issues Record Event Report (RER) at Sep 27, 7:31 AM EDT ...RECORD HIGH MINIMUM TEMPERATURE SET AT ISLIP NY...mesonet.agron.iastate.edu/p.php?pid=2018…
 
Minimum temperature departures through 9- 26:
 
LGA....+5.9
ISP....+6.6


 

These seem to be en vogue this year. Besides residue from AGW, what is the actual cause of this? 

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29 minutes ago, LurkerBoy said:

These seem to be en vogue this year. Besides residue from AGW, what is the actual cause of this? 

This short video helps to explain all the record ridges like the WAR getting stuck in place for extended periods of time.

 

 

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Through September 26, New York City (Central Park) has had a monthly mean temperature of 71.8°. That is tied for the 18th warmest figure through September 26.

Applying sensitivity analysis to the guidance, there is now an implied 91% probability that September will have a monthly mean temperature of 70° or above (estimated range: 70.6°-71.2°).  That will be consistent with the observed increased frequency of such warmth in September amidst a continuing steady increase in New York City’s average temperature.

At the same time, another rainstorm will move into the waterlogged region this evening. As a result, 2018 will likely move up to rank among the 50 wettest years on record with three months to go. To date, the Middle Atlantic region and parts of the Southeast have seen excessive rains. Across North Carolina and parts of Virginia, the amounts were enhanced by the historic rainfall associated with Hurricane Florence. Some figures through September 26 for select cities with the start of their climate record in parentheses:

Allentown (1912): 46.50” 35th wettest
Asheville (1869): 54.99” 11th wettest
Baltimore (1871): 53.45” 10th wettest
Cape Hatteras (1893): 64.08” 21st wettest
Harrisburg (1888): 49.71” 9th wettest
Oakland (1 SE), MD (1893): 54.99” 13th wettest
Pittsburgh (1871): 44.55” 10th wettest
Richmond (1887): 48.21” 36th wettest
Roanoke (1912): 45.18” 28th wettest
Scranton (1901): 45.67” 6th wettest
Washington, DC (1871): 48.93” 23rd wettest
Wilmington (1871): 86.50” wettest on record (old record: 83.65”, 1877)

Finally, it does appear that the synoptic pattern will evolve toward one in which rainfall will generally be below normal during the October 1-10 period.

 

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