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500 hPa Standardized Anomalies

Caption:
+(upper left) 500 hPa geopotential height (solid contours every 6 dam) and anomaly (shaded in sigma).
+(upper right) 500 hPa temperature (dashed contours every 6 K) and anomaly (shaded in sigma).
+(lower left) 500 hPa wind (arrows in m/s) and U-component anomaly (shaded in sigma).
+(lower right) 500 hPa wind (arrows in m/s) and V-component anomaly (shaded in sigma).
+Image was generated from 1.0x1.0^o NCEP-GFS data. Anomalies were computed using a 21-day running mean (1979-2009) from the NCEP-NCAR reanalysis.