Vincent Guénard, Laboratoire de Sondages Electromagnétiques de l'Environnement Terrestre, La Garde, France; and P. Drobinski, G. Tédeschi, and J. L. Caccia
Justin A. W. Cox, NOAA Cooperative Institute for Regional Prediction and Department of Meteorology, University of Utah, Salt Lake City, UT; and W. J. Steenburgh and G. Poulos