Field

NCEP/NCAR SLP
monthly mean slp from the NCEP Reanalysis
X axis: whole world in 144 2.50° steps, first point at 0.00° E, last point at 357.50° E
Y axis: regular grid with 73 -2.50° steps, first point at 90.00° N, last point at 90.00° S

Monthly data available from Jan1948 to Oct2024 ( 922 months)
Variable slp (Sea Level Pressure) in millibars
Full metadata.

Get grid points, average area or generate subset

Mask:	no mask   add a mask to the list
Latitude:	°N - °N
Longitude:	°E - °E
Year range:	-
Boundaries:	halfway grid points interpolated
Make:	average max min set of grid points subset of the field
Demand at least:	% valid points in this region
Units:	convert to mb leave in millibars

Create a field with lower time resolution

First fill missing data:	ignore, climatology, trend, persistence.
Then apply:	-month running mean with direction backward centred forward
Then apply new time scale:	keep same time scale annual (Jul-Jun) annual (Jan-Dec) biannual seasonal
New variable:	mean sd sum sum above sum below number min time of min max time of max first time last time of SLP
Minimum:	% valid data
Threshold:	no cut less than greater than millibars percentile normal 1971-2000

Create a field with lower spatial resolution

Average over blocks of longitude and latitude grid cells

Compute geostrophic wind components from this field

Construct a statistical forecast model from this field

Please consider downloading this field from the authoritative site.
If you really want to get it here, NCEP/NCAR SLP is available as a netcdf file (size 20.1749 MB).

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