ZCZC MIATCPEP5 ALL TTAA00 KNHC DDHHMM BULLETIN TROPICAL STORM ISIS ADVISORY NUMBER 4 NATIONAL WEATHER SERVICE MIAMI FL 8 AM PDT WED SEP 02 1998 ...ISIS BRINGING HEAVY RAIN AND POSSIBLE FLOODS TO WESTERN MEXICO... A TROPICAL STORM WARNING REMAINS IN EFFECT FOR BAJA CALIFORNIA SOUTH OF A LINE FROM SANTA ROSALIA TO PUNTA ABREOJOS...AND FOR THE MAINLAND COAST OF MEXICO FROM ELDORADO TO GUAYMAS. AT 8 AM PDT...1500Z...THE CENTER OF TROPICAL STORM ISIS WAS LOCATED NEAR LATITUDE 23.3 NORTH...LONGITUDE 109.5 WEST OR NEAR THE SOUTHERN TIP OF BAJA CALIFORNIA. ISIS IS MOVING TOWARD THE NORTH NEAR 8 MPH...13 KM/HR...AND THIS MOTION IS EXPECTED TO CONTINUE THROUGH TONIGHT. MAXIMUM SUSTAINED WINDS ARE NEAR 70 MPH...110 KM/HR...WITH HIGHER GUSTS. LITTLE CHANGE IN STRENGTH IS FORECAST DURING THE NEXT 24 HOURS. TROPICAL STORM FORCE WINDS EXTEND OUTWARD UP TO 175 MILES...280 KM ...MAINLY SOUTH OF THE CENTER. ESTIMATED MINIMUM CENTRAL PRESSURE IS 990 MB...29.23 INCHES. A STORM SURGE OF 2 TO 4 FEET ABOVE NORMAL TIDE LEVELS IS POSSIBLE IN THE WARNING AREA...ACCOMPANIED BY BATTERING WAVES. LARGE WAVES AND ROUGH SEAS CAN ALSO BE EXPECTED ALONG PORTIONS OF THE SOUTHWEST COAST OF MEXICO FROM MANZANILLO NORTHWARD TO THE WARNING AREA...AND SMALL CRAFT IN THAT AREA SHOULD REMAIN IN PORT UNTIL WINDS AND SEAS SUBSIDE. RAINFALL TOTALS OF 5 TO 10 INCHES ARE POSSIBLE IN THE WARNING AREA AND PORTIONS OF MAINLAND MEXICO TO THE EAST AND SOUTHEAST...AND COULD CAUSE LIFE-THREATENING FLASH FLOODS AND MUDSLIDES. REPEATING THE 8 AM PDT POSITION...23.3 N...109.5 W. MOVEMENT TOWARD...NORTH NEAR 8 MPH. MAXIMUM SUSTAINED WINDS... 70 MPH. MINIMUM CENTRAL PRESSURE... 990 MB. AN INTERMEDIATE ADVISORY WILL BE ISSUED BY THE NATIONAL HURRICANE CENTER AT 11 AM PDT FOLLOWED BY THE NEXT COMPLETE ADVISORY AT 2 PM PDT. RAPPAPORT NNNN