What is the maximum miles per hour recorded when the  CHI (Carvill Hurricane Index) is equal to 13.5
CREATE TABLE "table_1_historical_storms_and_the_chi_19" (
  "name" text,
  "year" real,
  "landfall" text,
  "nhc_advisory_number" text,
  "v_mph" real,
  "r_miles" real,
  "saffir_simpson_category" real,
  "chi" text
);
SELECT MAX("v_mph") FROM "table_1_historical_storms_and_the_chi_19" WHERE "chi"='13.5';