000 WTPZ34 KNHC 011738 TCPEP4 BULLETIN Tropical Storm Lidia Intermediate Advisory Number 12A NWS National Hurricane Center Miami FL EP142017 1200 PM MDT Fri Sep 01 2017 ...CENTER OF LIDIA MOVING NORTHWESTWARD ACROSS SOUTHERN BAJA CALIFORNIA SUR... ...HEAVY RAINS CONTINUE OVER SOUTHERN BAJA CALIFORNIA SUR AND PORTIONS OF MAINLAND MEXICO... SUMMARY OF 1200 PM MDT...1800 UTC...INFORMATION ----------------------------------------------- LOCATION...25.0N 111.6W ABOUT 45 MI...70 KM ENE OF CABO SAN LAZARO MEXICO ABOUT 100 MI...160 KM NW OF LA PAZ MEXICO MAXIMUM SUSTAINED WINDS...60 MPH...95 KM/H PRESENT MOVEMENT...NW OR 325 DEGREES AT 9 MPH...15 KM/H MINIMUM CENTRAL PRESSURE...992 MB...29.29 INCHES WATCHES AND WARNINGS -------------------- CHANGES WITH THIS ADVISORY: None. SUMMARY OF WATCHES AND WARNINGS IN EFFECT: A Tropical Storm Warning is in effect for... * Baja California peninsula from San Jose de Las Palomas to Isla San Luis * Mainland Mexico from Altata to Puerto Libertad A Tropical Storm Warning means that tropical storm conditions are expected somewhere within the warning area within 36 hours. Interests elsewhere in northwestern Mexico and the Baja California peninsula should monitor the progress of Lidia. For storm information specific to your area, please monitor products issued by your national meteorological service. DISCUSSION AND 48-HOUR OUTLOOK ------------------------------ At 1200 PM MDT (1800 UTC), the center of Tropical Storm Lidia was located over the Mexican state of Baja California Sur near latitude 25.0 North, longitude 111.6 West. Lidia is moving toward the northwest near 9 mph (15 km/h) and this motion is expected to continue with an increase in forward speed during the next couple of days. On the forecast track, the center of Lidia will move near or along the west coast of the Baja California peninsula through Saturday and then move west of the peninsula over the Pacific Ocean Saturday night. Maximum sustained winds are near 60 mph (95 km/h) with higher gusts. Weakening is forecast during the next couple of days while Lidia interacts with the mountainous terrain of the Baja California peninsula and moves over cold Pacific water. Lidia is expected to become a remnant low by Saturday night or Sunday. Tropical-storm-force winds extend outward up to 195 miles (315 km) mainly to the east of the center. Los Mochis recently reported sustained winds of 45 mph (72 km/h), and a Mexican automated station near Loreto recently reported sustained winds of 43 mph (69 km/h). The estimated minimum central pressure is 992 mb (29.29 inches). HAZARDS AFFECTING LAND ---------------------- RAINFALL: Lidia is expected to produce total rain accumulations of 6 to 12 inches across the Mexican states of Baja California Sur into Baja California, Sinaloa and the coastal section of Sonora, with isolated maximum amounts of 20 inches. These rains may cause life-threatening flash floods and mudslides. Some of the tropical moisture from Lidia may reach parts of the desert Southwest this holiday weekend, including southern California, southern Nevada and southwestern Arizona. WIND: Tropical storm conditions are occurring over the southern portion of Baja California Sur and over portions of the Mexican mainland at this time. These conditions should spread northward across the warning areas of the Baja California peninsula and mainland Mexico through Saturday. Wind speeds atop and on the windward sides of hills and mountains are often up to 30 percent stronger than the near-surface winds indicated in this advisory, and in some elevated locations could be even greater. STORM SURGE: A dangerous storm surge is expected to produce coastal flooding in areas of onshore winds on the southern portion of Baja California Sur. Near the coast, the surge will be accompanied by large and destructive waves. SURF: Swells generated by Lidia are affecting portions of the coast of southwestern and western Mexico and southern portions of Baja California Sur, and could cause life-threatening surf and rip current conditions. Please consult products from your local weather office. NEXT ADVISORY ------------- Next complete advisory at 300 PM MDT. $$ Forecaster Beven