6. In Resolution, choose from low, medium, high, and extra high.
The default resolutions are rectangular to match the default rectangular window sizes
of the Quick Look Window.
More information
‣
Display Parameters (page 27)
‣
Product Parameters (page 23)
‣
Associating Products with Tasks (page 17)
3.17 SRI: Surface Rainfall Intensity
SRI provides input for the RAIN1 product to obtain the best possible estimates of
accumulated precipitation even at longer ranges from the radar.
Vertical reflectivity profile is the most important source of error in radar rainfall
measurements in cool and moderate climates.
The upper parts of precipitating clouds typically give a weaker echo than the cloud base,
except near melting layer where the echo is much stronger. Thus a correction is needed to
estimate surface rainfall intensity.
IRIS SRI allows you to apply your local knowledge by providing ways to input information
about the reflectivity profile, as well as methods to make educated first guesses.
SRI distinguishes convective cases from large scale precipitation, and applies the correction
only to the latter. For convective precipitation, the value of the lowest clutter free bin is
shown.
3.17.1
SRI Algorithm
The SRI reflectivity profile and melting level estimation are not perfect, but they can improve
the rainfall estimates compared to performing no correction. The typical corrections
obtained are of the order -10 ... +5 dBZ (in mm/h scale up to factor of 4) depending on the
melting level altitude, distance from radar, and the lowest elevation angle.
Chapter 3 – Configuring IRIS Products
RESTRICTED 71
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