Rebecca C. Boltz and Ernest M. Agee Earth and Atmospheric Sciences, Purdue University

1. Variations in Florida Tropical Storms and Hurricane-Induced Tornadoes (HITs)Based on Global Fluctuations in Weather and Climate Studies by several researchers (e.g., Gray 1984; Pielke and Landsea 1999; Glantz 1999) show some statistical correlation of La Niña events to increased N. Atlantic Tropical Cyclone Frequency Northern Hemisphere Temperature Record • Summary and Conclusions • Florida TCs match well with N. Atlantic TCs • Florida HITs have increased during the past 20 years • La Niña as a predictor of N. Atlantic TC frequency has mixed results • The O.N.I. is positively correlated to N. Atlantic TCs (more bad news for La Niña) • N. Atlantic and Florida TC trends (and Florida HITs) correspond well with tropical N. Atlantic SST anomalies • Florida surface air temperature (and N. Amer. Ts) corresponds well with N. Atlantic and Florida TC trends and SST anomalies Cold and Warm Episodes by Season • TC1 corresponds to 1969 when JJA, JAS, ASO, SON & OND has an O.N.I. = +0.56 No La Niña – Doesn't Work! • TC2 corresponds to 1995 when the O.N.I. for TC season = -0.42 La Niña – It Works! • TC3 for 2005 = 28, and the O.N.I. = -.08 No La Niña – Doesn't Work! North American Surface Air Temperature Anomalies Rebecca C. Boltz and Ernest M. Agee Earth and Atmospheric Sciences, Purdue University Table 1: Hurricane seasons 1950-2001. All years except those listed are neutral years. El Niño years 1951, 1957, 1963, 1965, 1969, 1972, 1976, 1982, 1986, 1987, 1991, 1997La Niña years 1950, 1954, 1955, 1964, 1970, 1971, 1973, 1975, 1988, 1995, 1998, 1999 Tropical N. Atlantic SST Anomalies • M.E.I. Anomalies in Select Regions of the Tropical Pacific Ocean • TC1 and TC2 correspond to ENSO Index Values of +0.3 and +1.1, respectively