COMMON ETA ERROR ALONG EAST COAST
48 H ETA 500H V.T. 12Z 23 APR 98
48 H NGM 500H V.T. 12Z 23 APR 98
WHEN A CLOSED UPPER LOW APPROACHES THE COAST THE ETA SOMETIMES HAS PROBLEMS FORECASTING THE LOCATION OF THE SURFACE LOW. NOTE WHERE THE UPPER LOW IS CENTERED AND WHERE THE STRONGEST UPPER-LEVEL DIVERGENCE IS IMPLIED.