From http://www.srh.noaa.gov/mfl/history/ :
Beginning with July 1932, official psychrometric observations were made at the Miami Weather Bureau Airport Station, Miami Municipal Airport, 11229 Northwest 42nd Avenue, Hialeah, Florida. Dry and wet bulb thermometers, mounted on standard whirling apparatus, were exposed in an instrument shelter, over a sod covered plot, bounded 20 feet on the east and 30 feet on the west by paved roads. The location was about 13 miles northwest of central Miami. Biscayne Bay was about 7 miles to the east and Everglades about three miles west. In July, 1942, the WBAS moved to the new Miami International Airport. 5010 Northwest 36th Street, about 5-1/2 miles northwest of central Miami. The thermometers were exposed about 5-1/2 feet above the ground, 100 feet north of the main terminal building, over a sodded area bounded by asphalt drives 20 feet to the east, west, and south. Beginning in February, 1949, the readings were obtained from a telepsychrometer, exposed in the same location, over a sodded area of 1000 square feet, surrounded by a paved parking area. Biscayne Bay was 6 miles to the east; the Everglades area was 3-1/2 miles to the west. Mr. Wilmer L. (Tommy) Thompson was the WBAS MIC. In 1935, Mr. Ernest Carson became the MIC of the Miami WBO. Thus the City of Miami had a WBO downtown and a WBAS out at the municipal airport. Also in 1935, Congress appropriated money to revamp hurricane warning services in the Weather Bureau. This resulted in the establishment of new hurricane forecast centers at Jacksonville (primary), New Orleans, San Juan, and Boston.