Storm shifts offshore but remains dangerous
Hurricane Simon shifted its projected track off Mexico’s west coast on Sunday, reducing the immediate likelihood of a direct landfall while leaving coastal communities exposed to severe wind, rain and surf. The cyclone was downgraded one level to Category 3 on the five-point Saffir-Simpson scale, but forecasters continued to describe it as dangerous.
The storm was moving slowly off the coast. Earlier forecasts had indicated a landfall around midday local time, but information gathered by hurricane-hunter aircraft showed that Simon was moving more slowly than expected. It was forecast to pass about 15 kilometres, or nine miles, off the coast of Jalisco state rather than make a direct landfall in the short term.
A near miss does not mean the hazards disappear. Mexico’s meteorological service warned that Simon’s cloud bands and its most intense areas would still affect coastal communities. Heavy rain had already been linked to a landslide that destroyed a house in Acapulco, according to the report.
Mountain terrain is influencing the inner core
The latest forecast from the US National Hurricane Center said Simon appeared to be feeling the effects of the nearby Sierra Madre Mountains as its inner core brushed against the Mexican coast. The agency said it was becoming increasingly likely that the hurricane would avoid direct landfall in the short term, while cautioning that the eastern portion of the inner core could still produce hurricane conditions as the storm continued moving.
That combination is significant for communities along the coast. A tropical cyclone does not need to cross the shoreline for its strongest weather to cause disruption. The report cited warnings of severe coastal wind, exceptionally heavy rainfall and waves reaching up to nine metres, or 30 feet.
Fabian Vazquez, director of Mexico’s meteorological service, said that even without a direct landfall, the cyclone’s cloud bands and intense portions would affect coastal communities. The expected effects were especially severe along the coast because of wind, large waves and rainfall.
Puerto Vallarta prepares for deteriorating weather
In Puerto Vallarta, a tourist destination in Simon’s forecast path, AFP journalists observed overcast skies on Sunday morning. Heavier clouds were building over the sea and mountains, while light rain was falling. Businesses boarded up windows and doors in preparation for the storm.
The scene illustrates the practical challenge posed by a shifting forecast. A revised track can change the expected point of landfall, but it does not necessarily remove risk for locations already close to the circulation. When a Category 3 hurricane is moving slowly near a coastline, heavy rain and wind can remain major threats even if the center stays just offshore.
For coastal areas, the forecast hazards extended beyond rain alone. The meteorological service’s warning of waves up to nine metres indicated potentially dangerous surf conditions, while the report described exceptionally heavy rainfall and severe wind effects. These risks can affect homes, roads, businesses and people living or travelling near the shore.
A busy eastern Pacific season
Simon arrived during what the report described as a busy hurricane season in the Pacific. It linked the stronger activity there to the El Niño ocean-warming phenomenon, which was weakening wind shear and allowing storms to gain strength. By contrast, the same El Niño conditions had helped keep the Atlantic hurricane season relatively quiet.
Wind shear can influence a tropical cyclone’s ability to organize and maintain strength. In the account of Simon, reduced shear was part of the broader seasonal context for powerful Pacific storms. The storm itself had weakened by one category, but it retained Category 3 intensity and remained capable of producing hurricane conditions near the coast.
Its slow movement also mattered. Hurricane-hunter observations led forecasters to revise expectations about its timing and closest approach. Rather than treating the shift as an all-clear, authorities and forecasters emphasized continuing danger for the west coast of Mexico.
Why an offshore track still requires caution
Forecast tracks often focus public attention on the precise location where a storm’s center may cross land. Simon’s case is a reminder that the impacts of a large, powerful hurricane reach well beyond that point. The National Hurricane Center’s warning about the eastern inner core, along with Mexico’s warnings about cloud bands, wind, waves and rainfall, showed that a direct strike was not required for hurricane conditions to affect coastal areas.
For people in the forecast area, the immediate concern was the combination of severe weather rather than the landfall label alone. Heavy rainfall had already preceded a fatal-risk landslide event that destroyed a home in Acapulco. Along the coast, wave heights forecast at up to nine metres and severe winds added further hazards.
Simon’s course remained a developing situation on Sunday. The updated forecast reduced the prospect of an immediate direct landfall, but the hurricane’s proximity to the coast, slow movement and Category 3 intensity meant the risk of damaging conditions persisted for communities in western Mexico.
Forecasts guide preparation, not complacency
The report’s central message was that Simon’s adjusted path changed the expected track but not the need for preparation. Businesses in Puerto Vallarta had already boarded windows and doors, and meteorological officials stressed that the storm’s effects would still be felt by coastal populations.
As the hurricane moved near the Sierra Madre and along the Jalisco coast, forecasters continued to monitor how the terrain and the storm’s slow progress would shape its inner core and impacts. The difference between a direct landfall and a close offshore pass may be meaningful for the storm’s center, but it offers little protection from the rain bands, wind and dangerous waves that can extend toward land.
This article is based on reporting by Phys.org. Read the original article.
Originally published on phys.org
