Rainfall Potential = (Ravg) (D) / V |
To generate a TRaP product for this period, AMSU rain rates from a 00:45 UTC
(19:45 CDT) NOAA-15 pass were processed to extract a mean rain rate and approximate storm width. The mean rain
rate is typically defined along a cross section through the center of the storm (or maximum rain bands) in the
direction of the storm's observed motion. The mean satellite rain rate (Ravg) computed for Georges at
this time was 0.224 in/hr (5.69 mm/hr).
Multiplying Ravg by Georges' areal rain width D (360 nautical miles, 667 km) along the track and then dividing by the GOES estimate of Georges' motion V (12 knots, 22 km/hr), yields a rainfall potential (TRaP) of 6.72 inches (171 mm). The estimate assumes that the storm's current intensity, width, and forward motion will remain constant.