▁morning ▁in ▁conj unction ▁with ▁a ▁well - defined ▁spir al ▁band ▁on ▁rad ar . ▁Cal vin ▁then ▁dove ▁west - s outh west ▁and ▁weak ened ▁as ▁strong ▁wind ▁she ar ▁exposed ▁the ▁storm ' s ▁circul ation ; ▁it ▁fell ▁to ▁tropical ▁de pression ▁status ▁at ▁ 1 2 : 0 0   UTC ▁on ▁June   2 8 ▁and ▁further ▁deg ener ated ▁to ▁a ▁rem nant ▁low ▁by ▁ 0 6 : 0 0   UTC ▁the ▁next ▁day . ▁The ▁low ▁moved ▁generally ▁west ward ▁before ▁diss ip ating ▁well ▁south west ▁of ▁the ▁B aja ▁California ▁pen ins ula ▁on ▁July   3 . ▁As ▁a ▁tropical ▁cy clone , ▁Cal vin ▁caused ▁only ▁minor ▁damage ▁to ▁roof s ▁and ▁high ways , ▁flo oded ▁a ▁house , ▁and ▁to pp led ▁two ▁trees . ▁ ▁Trop ical ▁Storm ▁D ora ▁ ▁The ▁gen esis ▁of ▁Trop ical ▁Storm ▁D ora ▁can ▁be ▁attributed ▁to ▁a ▁west ward - mov ing ▁tropical ▁wave ▁that ▁emer ged ▁off ▁Africa ▁on ▁June   1 8 . ▁By ▁July   3 , ▁the ▁wave ▁passed ▁through ▁the ▁G ulf ▁of ▁Te hu ante pec , ▁where ▁broad ▁cycl onic ▁flow ▁began ▁to ▁develop ▁along ▁its ▁axis . ▁Following ▁further ▁organization , ▁the ▁disturb ance ▁intens ified ▁into ▁a ▁tropical ▁de pression ▁by ▁ 0 0 : 0 0   UTC ▁on ▁July   4 ▁and ▁further ▁strength ened ▁into ▁Trop ical ▁Storm ▁D ora ▁six ▁hours ▁later . ▁The