First layer of SPECHUMD from METGRID

[afernandezody]

Hello,
Looking at the content of met_em files (from 'ncdump') shows the first layer of SPECHUMD to be filled with -1.

...
246.2546, 246.2881, 246.3213, 246.3541, 246.3867, 246.4188, 246.4504,
246.4817, 246.5126, 246.5432, 246.5737, 246.6039, 246.6337, 246.6629,
246.6914, 246.7195, 246.7469, 246.7738, 246.8 ;

SPECHUMD =
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
0.001452274, 0.001457454, 0.001463542, 0.001470226, 0.001477271,
0.001484462, 0.001492279, 0.001500457, 0.001508427, 0.001515602,
0.001521687, 0.001527058, 0.00153211, 0.001537248, 0.001542665,
0.001548078, 0.001553534, 0.001559084, 0.001564765,
0.00143931, 0.001444378, 0.001450233, 0.001456614, 0.001463291,
0.001470073, 0.001477385, 0.001485013, 0.001492409, 0.001499048,
0.001504583, 0.001509378, 0.001513925, 0.001518741, 0.001524113,
0.001529712, 0.001535484, 0.001541369, 0.001547318,
...

All the other variables look like OK and the simulations have been completing, However, I am wondering if I'm doing anything wrong or if this might be causing any accuracy loss in the predictions,