|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
The maps show, for the 3-month season
indicated, the seasonal velocity potential anomaly
at 250 (top) and 925 hPa (bottom)
with respect to the 1971-2000 climatology (grey contours) for the season.
Positive anomalies are
shown in yellow and orange; negative anomalies in shades of
blue. The contour spacing 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.