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Tropical Storm John Forecast Discussion Number 12
2024-09-25 22:52:31| National Hurricane Center (East Pacific)
Issued at 300 PM CST Wed Sep 25 2024 000 WTPZ45 KNHC 252052 TCDEP5 Tropical Storm John Discussion Number 12 NWS National Hurricane Center Miami FL EP102024 300 PM CST Wed Sep 25 2024 John is becoming more organized this afternoon. Satellite imagery has shown deep bursts of convection forming near the center with curved banding around the majority of the circulation. Subjective Dvorak from TAFB and SAB were 3.5/55 kt and 2.5/35 kt, respectively, and the initial intensity for this advisory is set to 45 kt to represent a blend of these estimates. An Air Force Hurricane Reconnaissance aircraft is en route to investigate John and gather more information about the intensity, location, and structure. The tropical-storm-force winds in the southeast quadrant have been adjusted outward significantly based on an earlier partial ASCAT pass. Little has changed in the intensity forecast reasoning. Oceanic and atmospheric conditions are conducive for further intensification, as long as the storm remains over water. SHIPS-RII, a rapid intensification indicator, shows about a 70 percent chance of rapid intensification in the next 24 hours. The official intensity forecast now shows John becoming a hurricane in 24 hours as it nears the coast of southwestern Mexico. This forecast is near the top of the guidance, closest to HCCA, but could still be conservative. John is moving with an estimated motion of 355/3 kt. The track forecast is rather uncertain. Model guidance has shifted westward, and is showing John either nearly stationary or slowly following the coastline northwestward. This motion seems to depend on the strength of the ridge to the north-northwest, which is centered over the southwestern United States. However, the current motion suggests John should move closer to the coast with the center likely to move inland on Thursday afternoon or evening, though this could occur sooner. Future adjustments to the track forecast may be necessary, and there remains a large spread in the aids. A Hurricane Warning has been issued by the government of Mexico for portions of the coast of southwestern Mexico, and interests there should closely monitor future forecasts for updates. The Tropical Storm Warning and Hurricane Watch have also been extended westward. KEY MESSAGES: 1. Tropical Storm John will bring additional very heavy rainfall to coastal portions of southwest Mexico through Friday. The additional rainfall totals will be falling across areas that have received very heavy rainfall amounts over the past few days. This heavy rainfall will likely cause significant and catastrophic life-threatening flash flooding and mudslides to the Mexican States of Guerrero, Oaxaca and Michoacan. 2. John is forecast to strengthen to a hurricane before landfall, and a Hurricane Warning has been issued for a portion of the coastline of southwestern Mexico, where tropical storm conditions could begin later today. The Tropical Storm Warning and Hurricane Watch have also been extended westward. FORECAST POSITIONS AND MAX WINDS INIT 25/2100Z 16.8N 101.5W 45 KT 50 MPH 12H 26/0600Z 17.1N 101.5W 60 KT 70 MPH 24H 26/1800Z 17.5N 101.5W 65 KT 75 MPH 36H 27/0600Z 18.0N 101.6W 40 KT 45 MPH...INLAND 48H 27/1800Z 18.2N 102.1W 25 KT 30 MPH...INLAND 60H 28/0600Z...DISSIPATED $$ Forecaster Bucci/R. Zelinsky
Category:Transportation and Logistics
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Summary for Tropical Storm John (EP5/EP102024)
2024-09-25 22:52:07| National Hurricane Center (East Pacific)
...JOHN EXPECTED TO BECOME A HURRICANE... ...HURRICANE WARNING ISSUED FOR SOUTHWESTERN MEXICO... As of 3:00 PM CST Wed Sep 25 the center of John was located near 16.8, -101.5 with movement N at 3 mph. The minimum central pressure was 996 mb with maximum sustained winds of about 50 mph.
Category: Transportation and Logistics
Tropical Storm John Public Advisory Number 12
2024-09-25 22:52:07| National Hurricane Center (East Pacific)
Issued at 300 PM CST Wed Sep 25 2024 000 WTPZ35 KNHC 252051 TCPEP5 BULLETIN Tropical Storm John Advisory Number 12 NWS National Hurricane Center Miami FL EP102024 300 PM CST Wed Sep 25 2024 ...JOHN EXPECTED TO BECOME A HURRICANE... ...HURRICANE WARNING ISSUED FOR SOUTHWESTERN MEXICO... SUMMARY OF 300 PM CST...2100 UTC...INFORMATION ---------------------------------------------- LOCATION...16.8N 101.5W ABOUT 105 MI...170 KM W OF ACAPULCO MEXICO ABOUT 60 MI...100 KM S OF ZIHUATANEJO MEXICO MAXIMUM SUSTAINED WINDS...50 MPH...85 KM/H PRESENT MOVEMENT...N OR 355 DEGREES AT 3 MPH...6 KM/H MINIMUM CENTRAL PRESSURE...996 MB...29.42 INCHES WATCHES AND WARNINGS -------------------- CHANGES WITH THIS ADVISORY: The government of Mexico has issued a Hurricane Warning for the coast of Mexico from Tecpan de Galeana to Lazaro Cardenas. The government of Mexico has issued a Hurricane Watch for the coast of Mexico from west of Lazaro Cardenas to Punta San Telmo. The government of Mexico has issued a Tropical Storm Warning for the coast of Mexico from west of Lazaro Cardenas to Punta San Telmo. SUMMARY OF WATCHES AND WARNINGS IN EFFECT: A Hurricane Warning is in effect for... * Tecpan de Galeana to Lazaro Cardenas A Hurricane Watch is in effect for... * Acapulco to Tecpan de Galeana * Lazaro Cardenas to Punta San Telmo A Tropical Storm Warning is in effect for... * Punta Maldonado to Acapulco * Lazaro Cardenas to Punta San Telmo A Hurricane Warning means that hurricane conditions are expected somewhere within the warning area, this is case within 12 to 24 hours. Preparations to protect life and property should be rushed to completion. A Hurricane Watch means that hurricane conditions are possible within the watch area, in this case within 12 hours. A Tropical Storm Warning means that tropical storm conditions are expected somewhere within the warning area, in this case within 12 hours. For storm information specific to your area, please monitor products issued by your national meteorological service. DISCUSSION AND OUTLOOK ---------------------- At 300 PM CST (2100 UTC), the center of Tropical Storm John was located near latitude 16.8 North, longitude 101.5 West. John is moving toward the north near 3 mph (6 km/h). This motion should continue for the next day or so, followed by a gradual turn to the west-northwest on Friday. On the forecast track, the center of John is forecast to approach the southwestern coast of Mexico on early Thursday and be inland on Friday. Maximum sustained winds have increased to near 50 mph (85 km/h) with higher gusts. John is forecast to strengthen as it approaches the coast of southern Mexico on Thursday. Tropical-storm-force winds extend outward up to 150 miles (240 km) from the center. The estimated minimum central pressure is 996 mb (29.42 inches). HAZARDS AFFECTING LAND ---------------------- RAINFALL: Through Friday, Tropical Storm John is expected to produce additional rainfall amounts of 10 to 20 inches with isolated totals around 30 inches across portions of the Mexican States of Guerrero, Oaxaca and Michoacan. For a complete depiction of forecast rainfall associated with John, please see the National Weather Service Storm Total Rainfall Graphic, available at hurricanes.gov/graphics_ep5.shtml?rainqpf STORM SURGE: A dangerous storm surge is expected to produce coastal flooding near and to the east of where the center makes landfall. Near the coast, the surge will be accompanied by large and destructive waves. WIND: Hurricane conditions are expected along the coast within the hurricane warning area Thursday. Winds are expected to first reach tropical storm strength as early as tonight, making outside preparations difficult or dangerous. Preparations to protect life and property should be rushed to completion. Tropical storm conditions are expected to first reach the coast within the tropical storm warning area as early as tonight. SURF: Swells associated with John are forecast to continue to affect the coast of southern Mexico through the week, with the potential for dangerous surf and rip currents. Please see local statements for more information. NEXT ADVISORY ------------- Next intermediate advisory at 600 PM CST. Next complete advisory at 900 PM CST. $$ Forecaster Bucci/R. Zelinsky
Category: Transportation and Logistics