Wednesday, December 11, 2013

Colder surface temperature & temp inversion aloft

11.12.13 06Z

11.12.13 09Z


It is very interesting and astonishing.  As pointed out by many models the cyclone/ DD has drifted towards SW.  This can otherwise be considered as formation of new DD relatively in lower latitude. This may be attributed to cold surface air temperature and inversion in upper level upto 850 hPa.  








The SST along TN coastal  stretch & along south west bay is higher.










  

[This upper air profile on 11.12.13 / 00Z of Chennai]
PRES   HGHT   TEMP   DWPT   RELH   MIXR   DRCT   SKNT   THTA   THTE   THTV
    hPa     m        C          C          %       g/kg    deg      knot        K           K        K
-----------------------------------------------------------------------------
 1006.0     16     24.2      20.9     82      15.73      270       3       296.8    342.4     299.6
 1001.0     60     25.2     18.8      68      13.85      305       9       298.3    338.7    300.7
 1000.0     69     25.4     18.4     65       13.50     310     11       298.6     338.1    301.0
    850.0   1485   17.8   13.5     76        11.57      0        12       304.8     339.6    306.9

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