528 WTPZ35 KNHC 011153 TCPEP5 BULLETIN Tropical Storm Rosa Intermediate Advisory Number 25A NWS National Hurricane Center Miami FL EP202018 500 AM PDT Mon Oct 01 2018 ...ROSA BRINGING HEAVY RAINS AND FLOODING TO PORTIONS OF BAJA CALIFORNIA, SONORA, AND THE SOUTHWESTERN UNITED STATES... SUMMARY OF 500 AM PDT...1200 UTC...INFORMATION ---------------------------------------------- LOCATION...27.2N 116.7W ABOUT 105 MI...170 KM WSW OF PUNTA EUGENIA MEXICO ABOUT 285 MI...460 KM SSW OF SAN FELIPE MEXICO MAXIMUM SUSTAINED WINDS...50 MPH...85 KM/H PRESENT MOVEMENT...NE OR 35 DEGREES AT 12 MPH...19 KM/H MINIMUM CENTRAL PRESSURE...994 MB...29.36 INCHES WATCHES AND WARNINGS -------------------- CHANGES WITH THIS ADVISORY: None. SUMMARY OF WATCHES AND WARNINGS IN EFFECT: A Tropical Storm Warning is in effect for... * West coast of the Baja California peninsula from Punta Abreojos to Cabo San Quintin A Tropical Storm Watch is in effect for... * East coast of the Baja California peninsula from Bahia de los Angeles to San Felipe Interests elsewhere in the northern and central Baja California peninsula and northwestern Sonora should monitor the progress of Rosa. For storm information specific to your area, please monitor products issued by your national meteorological service. DISCUSSION AND OUTLOOK ---------------------- At 500 AM PDT (1200 UTC), the center of Tropical Storm Rosa was located near latitude 27.2 North, longitude 116.7 West. Rosa is moving toward the northeast near 12 mph (19 km/h), and this general motion is expected to continue through Tuesday. On the forecast track, the center of Rosa will approach the central and northern Baja California peninsula later today and then move across the peninsula into the northern Gulf of California tonight. Rosa's remnants are then expected to move across the Desert Southwest on Tuesday. Maximum sustained winds are near 50 mph (85 km/h) with higher gusts. Weakening is forecast through tonight while Rosa approaches and moves over the northern Baja California peninsula. Rosa is expected to dissipate over northwestern Mexico or the southwestern United States by Tuesday. Tropical-storm-force winds extend outward up to 150 miles (240 km) from the center. The estimated minimum central pressure is 994 mb (29.36 inches). HAZARDS AFFECTING LAND ---------------------- RAINFALL: Rosa is expected to produce the following total rainfall accumulations through Wednesday: Baja California and northwestern Sonora: 3 to 6 inches, isolated 10 inches. Central and Southern Arizona: 2 to 4 inches. Isolated 6 inch totals are possible in the mountains of Central Arizona. Rest of the Desert Southwest, Central Rockies, and Great Basin: 1 to 2 inches, isolated 4 inches. These rainfall amounts may produce life-threatening flash flooding. Dangerous debris flows and landslides are also possible in mountainous terrain. WIND: Tropical storm conditions are beginning to spread over the coast in portions of the warning area. Tropical storm conditions are possible within the watch area by late this afternoon or tonight. SURF: Swells generated by Rosa will affect portions of the coasts of southwestern Mexico, most of the west coast of the Baja California peninsula, and southern California through Tuesday. These swells are likely to cause life-threatening surf and rip current conditions. Please consult products from your local weather office. NEXT ADVISORY ------------- Next complete advisory at 800 AM PDT. $$ Forecaster Pasch