Page 



CLIMATOLOGY AND HYDROLOGY 130 



INTRODUCTION 130 



CLIMATE 130 



Temperature 130 



Precipitation 130 



Cloud Cover, Fog, and Relative Humidity 133 



Winds . . . 133 



Extratropical Cyclones 134 



Tropical Cyclones and Hurricanes 134 



U.S. GEOLOGICAL SURVEY HYDROLOGIC UNITS 140 



STREAM AND RIVER DISCHARGE 141 



SURFACE WATER QUALITY 143 



Water Qua! ity Assessment 153 



Mobile River Basin 153 



Mobi le Bay . . . T 165 



Perdido "RTver Basin 166 



Escatawpa River Basin 166 



Coastal Drainages" T~ 167 



GROUND WATER AVAILABILITY 167 



GROUND WATER QUALITY 169 



CURRENTS 170 



Peri do Bay 173 



Mobile Bay and Mississippi Sound 174 



SALINITIES 179 



REFERENCES 181 



SOURCES OF MAPPED INFORMATION 186 



VI 1 1 



