PPT Slide
Three Hour Rainfall Outlooks
(1) The speed and direction of movement of the coldest portions of
the convective systems are measured on the latest satellite
(2) This speed and direction are used to extrapolate the current
estimated rainfall rates out to 3 hours
(3) Heaviest rainfall areas are correlated best to the mean cloud-
layer shear vector (i.e., moves in the direction of 850-300
(4) For regenerative convective systems, the growth and movement
of individual convective clusters must be considered
(5) The following “trend and expectancy” guidelines are used to
anticipate the evolution of the convective systems for the next 3
hours --- these guidelines are used to adjust the extrapolated