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The Last Days Of Summer: September 2015 DISCUSSION/OBS


UnionWeatherWx

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So apparently 6" of rain in one day did not do much to help the vegetation here which has gone back to it's favorite brown. Trees are doing better however as some of that did soak in. Soil moisture is right back to bone dry. This will continue to hurt precip chances moving forward

I would also think guidance will be too low on high temps...the drier ground will add 1-3 degrees to highs although the lower end of this range will come into play more often with the quickly lowering sun angle.

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If one factors the Atlantic's sea surface temperature anomalies (standardized for the 1950-95 period) into the picture, it appears that October may also wind up dry in parts of the East. The standardized anomalies are relatively close to those of 1982 heading toward October. The area of dry anomalies for the past 30 days lines up quite well with those of September 1982. October 1982 was particularly dry from the Ohio Valley into New England and across parts of Texas.

 

The latest run of the CFSv2 lends support to the idea of dry conditions in from the Ohio Valley into New England. However, the CFSv2 does not always fare well when it comes to forecasting precipitation anomalies. Its forecasts for September were much too wet nationwide.

 

The GFS ensembles currently suggest that October could begin on the dry side in parts of the Ohio Valley into New England. In contrast, the latest run of the GFS shows the potential for a significant rainfall late in the first week in October followed by a fairly sharp cold shot shortly afterward. Of course, one is dealing with the extended range, so there's a lot of uncertainty, especially as the current El Niño is already a strong one, while the 1982-83 El Niño was rapidly developing.

 

The main point is that the potential exists for a continuation of the current generally dry conditions in October. But there's enough uncertainty that such an outcome isn't assured. Subsequent guidance will be important.

 

ENSOQPF09232015.jpg

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If one factors the Atlantic's anomalies (standardized for the 1950-95 period) into the picture, it appears that October may also wind up dry in parts of the East. The standardized anomalies are relatively close to those of 1982 heading toward October. The area of dry anomalies for the past 30 days lines up quite well with those of September 1982. October 1982 was particularly dry from the Ohio Valley into New England and across parts of Texas.

 

The latest run of the CFSv2 lends support to the idea of dry conditions in from the Ohio Valley into New England. However, the CFSv2 does not always fare well when it comes to forecasting precipitation anomalies. Its forecasts for September were much too wet nationwide.

 

The GFS ensembles currently suggest that October could begin on the dry side in parts of the Ohio Valley into New England. In contrast, the latest run of the GFS shows the potential for a significant rainfall late in the first week in October followed by a fairly sharp cold shot shortly afterward. Of course, one is dealing with the extended range, so there's a lot of uncertainty, especially as the current El Niño is already a strong one, while the 1982-83 El Niño was rapidly developing.

 

The main point is that the potential exists for a continuation of the current generally dry conditions in October. But there's enough uncertainty that such an outcome isn't assured. Subsequent guidance will be important.

 

ENSOQPF09232015.jpg

late October 1982 there was a noreaster with almost 2" of rain in NYC...At the time I thought it was a good sign for the winter...February had a similar storm with cold air to work with and we know how that worked out...1972 was the opposite with a very wet fall...

cd100.33.44.93.265.7.24.55.prcp.png

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