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40 <br />inches of rainfall. Sea breezes modify the climate of a narrow coastal <br />belt a few miles wide. The sea breeze quickly reduces high afternoon <br />temperatures and provides a flow of air when one would otherwise not <br />exist. <br />The sea breeze is most prevalent in summer, when winds in the County <br />average 9.4 mph. In addition, the mixing height (thickness of a layer of <br />air resting on the ground surface, in which vigorous vertical mixing <br />occurs) is thickest during the summer and thinnest in the winter. <br />High risk areas relative to hurricane and flood effects have been identified <br />and designated based on elevation and proximity to coastal waters. <br />Development density of any specific area has been considered in the <br />allocation of shelter space. The vulnerability of nursing homes and <br />congregate care centers to the adverse effect of severe weather, <br />primarily based on elevation and construction, requires special <br />consideration in evacuation plans. <br />The chief industries of the heavily populated east coast are light <br />manufacturing, citrus production and processing, selected service trades, <br />construction, aircraft manufacturing (Piper), real estate, wholesale and <br />retail trade. <br />D. ECONOMIC PROFILE <br />Below is a chart listing the five largest employers in Indian River County <br />and their approximate current level of employment as of July 1997. <br />RANK EMPLOYER TYPE EMPLOYEES <br />1 School Dist. of Indian River Co. Government 1,850 <br />2 Indian River Memorial Hospital Health Care 1,300 <br />3 Indian River County Government 1153 <br />4 Publix f;orporation Retail, Grocery 900 <br />5 Sun Ag, Inc. Citrus, Agriculture 850 <br />Source: Vero Beach/lndlan River County Chamber of Commerce, July 23, 1997). <br />Indicates peak seasonal employment <br />The data collected for 1997 indicates Indian River County's <br />unemployment rate as 8.1% and a 1996 per capita income of 534,374. <br />The median housing value for Indian River County in 1993 was $83,160. <br />Indian River County Comprehensive Emergency Management Plan Basic Page 47