November 2017 Met Central - Very Warm and Very Dry Month

La Nina rules! New Mexico and most of the desert soutwest spent most of November locked under a great big high pressure dome. Consequently
temperatures soared and precipitation was negligible. Temperatures on the Sevilleta set many new records. Mean maximum temperatures for the refuge of 68 F ran over 8.5 degrees F warmer than the long term average of 59.5 F. There were 5 new daily high temperature records set during the month as well as one daily low. The average daily high temperature only ran below normal on 3 days. The mean average daily temperature of 51.8 F sort of crushed the old record of 49.8 F.

    November Record Temperatures - High 28.0 (82.4 F), Low -17.8 (0.0 F)
    November '17 Record Temperatures - High 26.0 (78.8 F), Low -12.9 (8.8 F)

Precipitation on the refuge was zero for the month. This is only the second year in 28 years that there has been no November precipitation - the other was 1999. However here has been a hand full of other years with an average of

November Meteorological Summary

                    November   November '17      November '17
Variable             Long-term* Mean    Mean           Mean Range
Mean Max Temp (C)         15.25           20.0         17.8 - 20.9
Mean Min Temp (C)         -0.82            2.1         -1.9 - 3.4
Mean Average Temp (C)      7.21           11.0          9.5 - 12.0
Mean R.H. (%)             45.8            35.0         31.5 - 40.1
Mean Vap Press. (mb)       4.42            4.47        4.31 - 4.70
Mean Max Wind (m/sec)      8.5             7.9          7.5 - 8.9
Mean Solar Rad. (kWh/m2)   3.76            4.05        3.74 - 4.41
Precip.(mm)                12.4            0.0          0.0 - 0.0
*Long-term refers to all of the Sevilleta met stations for 1989-2016

Albuquerque - Sevilleta Comparison

Albuquerque November precipitation was also zero for the month. This ties it with 8 other years in the past 124 with zero November precipitation

Mean average daily temperature in Albuquerque smashed the old 124-year record.

               Loc         Precip          Normal         % of Normal
November	ABQ 	   0.0 mm         14.5 mm            3 %
                SEV        0.0 mm         12.4 mm           54 %

Year to Date    ABQ       194.8 mm        227.3 mm           86 %
                SEV       230.8 mm        225.8 mm          102 %
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Water-year Precipitation

The Sev is off to a very slow start for this 2017-18 water-year although there have been 4 years in past 28 with worse starts, the worst being 0.9mm in 2012.

     Water Year Precipitation (mm)
Month           Mean            2017-2018    
Oct             22.5              12.2       
Nov             12.4               0.0
                34.9		  12.2 


Droughtcondition continued to expand across the western part of NM. The U.S. Drought Monitor rated the western half of NM, including the Sevilleta as under drier than normal condition


Storm tracks across the U.S. have certainly been typical of La Nina with the Pacific northwest seeing way above average precipitation while the desert southwest has been warmer and drier than normal. Models had predicted that a weak La Nina would develop for the winter and spring of this year. The Sea Surface Temperature (SST) anomaly for the key 3.4 Nino zone has continued to drop and ended the month at -0.7 Ocean Nino Index (ONI) for the Sep-Oct-Nov period was -0.7 which indicates a weak La Nina

The Southern Oscillation Index (SOI) went from +0.6 in September to +0.9 for Nov so that the 5-month is at +0.48 - just at the border of La Nina.


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