Key Facts at a Glance
Hurricane Katrina was one of the costliest and deadliest tropical cyclones on record for the United States. The storm originated over the Bahamas, traveled across South Florida as a moderate hurricane, then explosively intensified in the Gulf of Mexico before making multiple landfalls along the northern Gulf Coast. The following table summarizes verified attributes critical to answering queries about its date and location.
| Attribute | Verified Detail | Source Type |
|---|---|---|
| Formation Date | August 23, 2005 (as a tropical depression) | Best track data, NHC |
| Landfall Dates and Locations | Aug 29: Southeast Louisiana (Buras); Aug 29: Mississippi (near Biloxi) | Best track data, NHC |
| Peak Intensity (Pressure) | td>902 mb (central pressure at peak in Gulf)Re-analysis, NHC/NOAA | |
| Storm Category at U.S. Landfall | Category 3 at Louisiana/Mississippi (Saffir–Simpson) | Best track data, NHC |
| Primary Impact Regions | Southeast Louisiana (especially New Orleans), Mississippi coastal counties, Alabama (Mobile), Florida (Southwest) | Storm summary, NHC product archives |
Formation and Early Stages
Hurricane Katrina began as a tropical depression that formed on August 23, 2005, near the Bahamas. Initial movement was generally westward, bringing impacts to southern Florida on August 25 as a tropical storm. After crossing Florida, the system emerged into the Gulf of Mexico, where warm sea surface temperatures and favorable upper-level winds enabled rapid intensification. By the time it reached hurricane strength over the central Gulf, Katrina had already set the stage for a catastrophic event along the northern Gulf Coast.
Intensification and Gulf of Mexico Track
In the Gulf of Mexico, Katrina underwent explosive intensification, with its central pressure falling roughly 30 mb in 24 hours. The storm’s core organization featured a well-defined eye and a compact, intense eyewall, contributing to significant storm surge potential. Forecast models at the time generally captured the general west-northwest trajectory toward the Louisiana–Mississippi border region, though exact landfall timing and intensity continued to evolve as the hurricane approached the coast.
Landfall and Primary Impact Zones
On August 29, 2005, Hurricane Katrina made landfall twice in Louisiana—first as a Category 3 near Buras, then a second, weaker landfall elsewhere—as it crossed the state. A third landfall occurred later that same day in Mississippi, near the coastal community of Bay St. Louis, also as a Category 3. These strikes delivered devastating storm surge, extreme wind damage, and widespread rainfall flooding. Coastal communities along the Mississippi Sound and the Louisiana parishes east of New Orleans experienced extreme winds and catastrophic flooding, while New Orleans faced severe breaches in the federal levee system, leading to prolonged urban inundation.
Immediate Aftermath and Scope
In the immediate aftermath, the scale of damage across Louisiana, Mississippi, and Alabama became clear. Critical infrastructure—transportation, power, communications—was heavily disrupted for weeks. Tens of thousands of residents required rescue, and displacement was rapid and large-scale. Federal, state, and local responses were subsequently scrutinized for performance and preparedness, shaping long-term policy and rebuilding efforts in the Gulf Coast region.
Long-Term Impacts and Recovery
The aftermath of Katrina spurred significant changes in building codes, flood protection, emergency management, and community resilience along the Gulf Coast. Recovery spanned years, with many neighborhoods undergoing redevelopment and some areas seeing permanent population shifts. The event remains a benchmark case for hurricane risk, underscoring the intersection of meteorology, infrastructure, and public policy in shaping outcomes for highly vulnerable regions.
Why Date and Location Matter
Pinpointing the date and location of Hurricane Katrina clarifies how and why the storm had such a profound effect on the Gulf Coast. Landfall locations determined which communities experienced the worst storm surge and wind damage, while the timeline explains the sequence of watches, warnings, and evacuations. Understanding these verified facts supports better risk communication, preparedness planning, and long-term resilience for future hurricane seasons.
Frequently Asked Questions
- When did Hurricane Katrina form? It formed as a tropical depression on August 23, 2005, near the Bahamas.
- Where did Hurricane Katrina make landfall? It made landfall in southeastern Louisiana (including the New Orleans area) and along the Mississippi coast on August 29, 2005, with additional impacts in Alabama and Florida.
- What path did Hurricane Katrina take? It moved westward from the Bahamas through Florida, intensified in the Gulf of Mexico, then tracked northwest to north-northwest into Louisiana and Mississippi.
- What factors contributed to Katrina’s severity? Warm Gulf waters, strong intensification prior to landfall, a large storm surge footprint, and levee failures in New Orleans were major contributors to its impact.
- How is Hurricane Katrina used in planning today? Its lessons inform coastal building standards, evacuation planning, flood protection investments, and emergency response protocols for future storms.