Data: NCEP reanalysis monthly velocity potential
(250 and 925 hPa) on a 2.5 x 2.5 deg. lat/lon grid.
Base Period: 1971-2000
Data Source: NCEP
Description:
The maps above show the monthly velocity potential anomaly
at 250 (top) and 925 hPa (bottom)
for the given month with respect to the 1971-2000 climatology (grey contours).
Positive anomalies are
shown in yellow and orange; negative anomalies in shades of
blue. The contour interval for the climatology is 1.0E+6 m2/s; solid contours
indicate positive values and dashed contours indicate negative values.
NCEP is an acronym for the U.S. National Centers for Environmental Prediction.
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