The "Forecast Performance" image allows the user to
review the accuracy of the previous hour's forecast. The dark bown
shapes are the 0350 GMT 1 hour forecast. These polygons are overlaid
on the hazard field generated at 0450 GMT. A perfect forecast would
have the polygons filled with level 3 or higher and only level 1
& level 2 outside the polygons. Click image to toggle to the
0350 hazard field and forecast shapes.
forecast shape" to return to forecast to this