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SLP, 1000-500 hPa Thickness, and 250 hPa Wind Speed

Caption:
+Sea-level pressure (solid contours every 2 hPa).
+1000-500 hPa thickness (dashed contours every 6 dam).
+250 hPa wind speed (shaded according to the color bar in m/s).
+Fields were computed from the 0.5x0.5^o NCEP-GFS data.