September 2017 - Big Finale to Water-Year

September weather news from the Sevilleta paled in comparison with that from other
places around the country, particularly in comparison to TX, FL and
the Caribbean. - more below.

The September, Sevilleta weather story
was a tale of warm and dry early and cool
and moist by the end of the month. Average daily high temperatures
ran above and or well above normal for the first 23 days of Sep. Then
they dropped down below average for the rest of the month.

    September Record Temperatures - High 37.6 (99.7 F), Low -3.3 (26.0 F)
    September '17 Record Temperatures - High 35.0 (95 F), Low 4.9 (40.8 F)

The month-end cooling brought with it a majority of September's moisture. Up through the 25th
the Sev had seen only an average of 6.8 m of precipitation - much of that came at only 2 stations
on the 9th. Then a wet system came in and dropped an average of 38.8 m over the period of the
26th through the 30th.

September Meteorological Summary

                     September     September '17        September '17
Variable             Long-term* Mean    Mean           Mean Range
Mean Max Temp (C)         28.51           29.6         31.2 - 34.7
Mean Min Temp (C)         12.71           13.1         15.1 - 18.6
Mean Average Temp (C)     20.61           21.3          23.1 - 26.6
Mean R.H. (%)             44.0            37.2         41.6 - 46.2
Mean Vap Press. (mb)       9.81            8.66       11.75 - 13.17
Mean Max Wind (m/sec)      9.4            10.3          8.8 - 11.5
Mean Solar Rad. (kWh/m2)   5.95            6.18        6.59 - 8.47
Precip.(mm)                35.3           45.9         40.4 - 74.5
*Long-term refers to all of the Sevilleta met stations for 1989-2016

Albuquerque - Sevilleta Comparison

Albuquerque again did not fare as well as the Sevilleta from the
September storms getting only about half as much as the Sev.

               Loc         Precip          Normal         % of Normal
September      	ABQ       22.9 mm         27.4 mm            84 %
                SEV       45.9 mm         35.3 mm           130 %

Year to Date    ABQ       160.1 mm        186.9 mm           86 %
                SEV       218.6 mm        189.3 mm          115 %
Remember to check National Weather Service Monthly highlights at:

Water-year Precipitation

September finished the water-year with a big exclamation point.
This was the first water-year since 2009-10 that the Sev has
gotten above-average moisture.... and this was way above average.
Tied for the 2nd wettest water-year in LTER tenure.

     Water Year Precipitation (mm)

Month           Mean            2016-2017    
Oct             22.2               5.1       
Nov             11.2              45.1
Dec		14.1		  23.1
Jan              8.0		  33.9
Feb 		 7.5		  10.0
Mar		12.9		   9.4
Apr		11.9		  15.8
May		13.3		   8.0
Jun		14.5		   4.4
Jul		44.8		  56.8
Aug          	41.1		  35.9
Sep		35.3		  45.9
               236.8		  293.4 


The drought (or non-drought)situation has continued to be generally
quite positive for the entire state altho the far western edge of the
NM is being classifed as abnormally dry as of Sep 26th although this
was just before the wet system hit at about that same time.
abnormally dry.


Seems likely that a weak La Nina may be in place for the winter and
spring of this year. The Sea Surface Temperature anomaly for the key
3.4 Nino zone has continued to drop and ended the month at -0.4 Ocean
Nino Index (ONI) for the Jul-Aug-Sep period was -0.2

The Southern Oscillation Index (SOI) was +0.6 in September so that the
5-month is at +0.36.

Notables from on and off the Sev

The big weather stories of September continued to focus on hurricanes battering the U.S. mainland as well as the islands in the south Atlantic. As Augusts Hurricane Harvey finally lost punch another stronger hurricane, Irma, took aim at Florida. The predictions were for this hurricane to travel up the spine of Florida and indeed it did exactly that with the only mis-calculation being that it rode up the western edge rather than than following the earlier prediction of the the eastern edge. In any case Irma hit the Florida keys as the strongest Hurricane ever to hit the U.S. mainland.

Unfortunately the tropical storm onslaught was not over. Hurricane Maria hit Puerto Rico with category 5 force winds and did a huge amount of damage to the entire island.


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