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October 2019 General Discussions & Observations Thread


Rtd208
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The next 8 days are still averaging 59degs., or about 4degs. AN.

Month to date is +2.5[62.3].        Should be near +3.1[61.1] by the 22nd.

60.0* here at 6am.

GFS still going from near 80* to near 40* the 22nd. to the 27th.      

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13 minutes ago, ForestHillWx said:

We need a good soaking. Been a rather dry  fall. Thankfully spring and most of summer were wet. 

It will be interesting to see exactly where the remnant tropical energy from near  Baja California  phases with the closed low in the Great Lakes. The tropical input looks like why the models are so wet and deep with the low. Just need to pin down the exact track.
 

D5E0ABF2-33AA-4FB7-8B4D-4E688762A620.thumb.png.6a0523aecf025927940f99a936be5c2b.png

 

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Just now, bluewave said:

The Euro is showing multiple lows like the NAM. We probably have to wait until tomorrow to see which one becomes strongest. That will determine the placement of strongest winds and heaviest.

4A4F6358-C16E-4C78-BE86-93EB02F98B95.thumb.png.6ae152dd05e8b4f67dee9b04da9fd3d1.png

 

yeah that run is worthless in that regard there will not be 3 lows

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Much of the region experienced bright sunshine and readings in the 70s today. The heaviest precipitation in several months appears likely for parts of the region Wednesday into Thursday. For New York City, 84% of the EPS members show 1.00" or more precipitation; 71% show 1.50" or more precipitation; and, 41% show 2.00" or more. Therefore, a general 1.00"-2.00" rainfall now appears likely. Some areas, especially on Long Island, will likely see even higher amounts.

The last time New York City received 1.00" or more rain in a day was August 22 when 1.01" fell. The last time New York City picked up 1.50" rain in a day was July 22 when 1.66" fell. The last time New York City received 2.00" or more rain in a day was August 11, 2018 when 2.90" fell.

Following the storm, cooler weather will give way to another round of warmer than normal temperatures.

The last week of October will likely start mild but end with a cool shot. The cool conditions could linger into the first days of November, but overall the cool shot will likely be transient in nature, not the start of a long-duration cold pattern.

The ENSO Region 1+2 anomaly was -1.0°C and the Region 3.4 anomaly was +0.4°C for the week centered around October 9. For the past six weeks, the ENSO Region 1+2 anomaly has averaged -0.88°C and the ENSO Region 3.4 anomaly has averaged +0.12°C. The strong cooling that took place in Region 1+2 during September indicates that the prospects for a neutral-cool ENSO during the winter have increased. A neutral ENSO is currently the base case for Winter 2019-20.

The SOI was -5.74 today.

Today, the preliminary Arctic Oscillation (AO) figure was +0.654.

Since 1950, there have been five prior cases when the AO averaged -0.500 or below in both July and August: 1950, 1958, 1960, 1968, and 2015. The average temperature for September through November in New York City was 58.9° (59.6° adjusted). All cases featured a warmer than normal fall. The potential for autumn 2019 to rank among the 30 warmest cases on record has increased in recent weeks. For New York City, that would translate into a September-November mean temperature of at least 58.8°.

In August, the AO averaged -0.722 and in September the AO rose to +0.306. The possible transition to predominantly positive values from September into October has been a relatively uncommon occurrence. Since 1950, only 1963 and 2011 saw a transition of an August value of -0.500 or below to positive values in September and a positive average in October. Both cases featured a warmer than normal November in the Middle Atlantic and southern New England areas.

On October 13, the MJO was in Phase 8 at an amplitude of 1.334 (RMM). The October 12-adjusted amplitude was 1.225.

In the two prior cases when the MJO moved into Phase 1 in late September or early October and then remained in Phase 1 for 12 or more consecutive days as occurred this year, the average decline in the 14-day average temperature for the 2-3 weeks that followed the MJO's moving out of Phase 1 was gradual. The current long-duration Phase 1 episode suggests that the second half of October could be warmer than normal. For New York City, an October mean temperature of 58.5°-59.5° (1.6° to 2.6° above normal) would be implied by those earlier long-duration Phase 1 cases. Based on the sensitivity analysis, the estimated October mean temperature is currently 59.2°.

Based on sensitivity analysis applied to the latest guidance, the implied probability of New York City having a warmer than normal October is approximately 74%.

Finally, on account of very slow ice growth, Arctic sea ice extent for October 13 was a daily record low figure of 4.881 million square kilometers. There is a chance that today's figure will be the latest ever figure under 5 million square kilometers.

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