On the estimation of areal windspeed distribution in tropical cyclones with the use of satellite data.
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On the estimation of areal windspeed distribution in tropical cyclones with the use of satellite data.

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On the estimation of areal windspeed distribution in tropical cyclones with the use of satellite data.
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  • Personal Author:
    Timchalk, Andrew
  • Corporate Authors:
    United States. National Environmental Satellite Service.
  • NOAA Program & Office:
    NESDIS (National Environmental Satellite, Data, and Information Service)
  • Description:
    This paper Is an attempt to determine whether the areal wlndspeed distributions In tropical cyclones can be estimated by use of two satellite data parameters:Cl) the low-level convective cloud band crossing angle relative to tangents to concentric circles centered on the eye, (2) the Infrared temperatures from the 10.5-to-12.5 ym channel. These two parameters plus the "ground truth" winds were all derived for 128 polar coordinate grid points (16 azimuths and 8 radii).

    Coincident values of the variables were evaluated statistically first by linear regression and afterward by multiple screening regression. For the entire storm area (all radii), the correlation between observed wind- speed and the two satellite-derived parameters [(1) and (2), above] was 0.4 and -0.6, respectively. However, when evaluated at separate radii the two satellite parameters were poorly correlated to either the observed or relative wlndspeed.

    Radial distance from the storm center was found to explain 63% of the variance In wlndspeed. When this relation was removed by screening regression, the two satellite parameters could explain only an additional 2% to 3% of the variance.

    Correlation between the cloud band crossing angle and the wind field crossing angle was less than 0.5 at all radii. Correlation between the wlndspeed and the wind field crossing angle was less than 0.2. In both cases, the coefficients were lower than expected.

  • Keywords:
  • Series:
    NOAA technical report NESS ; no. 74
  • Document Type:
    Technical Report
  • Rights Information:
    Public domain
  • Compliance:
    Library
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