Question: yesterday the model for Trudy in the Windy app showed it moving slower and staying off the coast, passing La Manzanilla around Tuesday. today, the model has it turning into Manzanillo by Sunday.

Answer:
What you are seeing with Hurricane Trudy is an excellent real-world example of meteorological "steering" forces changing. It is fully understandable why that sudden jump feels like a wild day-to-day swing.
The dramatic shift in Trudy’s forecast path between yesterday and today is caused by a complex interaction between multiple weather systems, not the AI models glitching or randomly rewriting the track:

Why the Forecast Shifted So Suddenly

1. The "Two-Storm" Dance (Fujiwhara Effect): Trudy isn't alone out there. Tropical Storm Simon is sitting nearly stationary just to the northwest. Yesterday, models anticipated the two storms might maintain their distance, allowing Trudy to slide slowly past La Manzanilla into next Tuesday. As they have gotten closer, their wind fields are interacting, which is actively pulling Trudy further eastward and speeding up its trajectory toward the coast.
2. The Texas Cold Front & High Pressure: A strong cold front dropping south through Texas into Mexico, combined with a building high-pressure ridge, is acting like a atmospheric wall. Yesterday, it looked like this wall would keep Trudy pinned offshore. Today, the steering winds on the edge of that high-pressure system are forcing a sharper, faster right-hand turn directly into the Colima/Jalisco coast near Manzanillo.

The Core Difference: Timing vs. "Wild" Swings

While a shift from Tuesday (offshore) to Sunday (direct hit) is a major, high-stakes change for residents in Jalisco and Colima, meteorologists view this as a refinement in steering timing rather than a "wild track swing" (which would be the storm jumping back and forth from Baja to Oaxaca).
Instead of a model error, this is a case where the physical atmosphere shifted, and both AI and traditional models picked up on the new steering current at the same time, causing a synchronized shift across the Windy app's layers (like the ECMWF and GFS models).

Current Official Safety Guidance

Because of this acceleration, Hurricane Trudy is now a Category 1 storm rapidly intensifying and expected to become a major hurricane before making landfall this weekend.
• Impact Zone: Heavy impacts are expected between Colima and Jalisco.
• Primary Threat: The National Hurricane Center (NHC) warns of 4 to 8 inches of rain (with isolated spots up to 12 inches), meaning life-threatening flooding and mudslides are a major risk for steep terrain near the coast by Sunday.