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Regardless , the differences between the 0-h soundings ( which include rawinsonde data in the analyses ) and the 1-h soundings ( which do not have rawinsonde data ) are not particularly large . Also worth noting is that Houston has a travel time index of 1.42 ( ratio of rush hour travel time to off-peak ) , which is in the middle for a " very large city " , wheras Portland has a TTI of 1.37 , near the very upper end of the " large city " category ( i.e. cities that are fairly comparable to Portland ) . This parameter accounts for biases in tornado counts which arise when members of a family of tornadoes are reported as a single long track tornado ( Doswell and Burgess , 1988 ) . I received a one-page letter from Dominion Power ( DOM ) about their proposal and they ask me for help to support their bill pending before Virginia Assembly . In effect , they capture the degree of similarity ( or disparity ) among products within a brand and across different brands in the same category . Forecast errors for the 1-h RUC-2 forecast soundings ( not shown ) valid at either 12 or 00 UTC were similar to the 0-h errors .