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Jun 18, 20261
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Post-Tropical Cyclone Arthur Drenches Louisiana, Bringing Flood Threat and Tornado Risk
Post-tropical cyclone Arthur, while dissipating over Texas, is directing heavy rain and tornado threats to Southeast Louisiana. A Tornado Watch is active through early Thursday, and a Flood Watch continues through Friday, with some areas potentially receiving up to 15 inches of rain.
Quick Facts
Who
National Weather Service
What
Post-tropical cyclone Arthur brings heavy rainfall
When
overnight into Thursday morning
Where
Southeast Louisiana
- Post-tropical cyclone Arthur brings heavy rainfall
- Tornado Watch in effect until 6 a.m.
- Flood Watch issued through Friday morning
- Flash flooding and tornado development expected
- National Weather Service
Post-tropical cyclone Arthur, now dissipating over Texas, continues to channel bands of tropical moisture into Southeast Louisiana, prompting warnings for both flash flooding and tornadoes through Thursday morning. Meteorologists caution that the system's lingering effects will persist, creating a significant two-front hazard for the region.
A Tornado Watch remains in effect until 6 a.m. Thursday, as conditions are favorable for the development of brief tornadoes across the area. The primary threat, however, remains heavy rainfall capable of producing dangerous flash flooding, especially in areas with already saturated ground and elevated rivers.
The heaviest precipitation is expected in the river parishes, the north shore of Lake Pontchartrain, and coastal Mississippi, where totals could reach 10 to 15 inches, with isolated spots possibly seeing even higher amounts. The south shore is forecast to receive 3 to 6 inches. A Flood Watch is in effect through Friday morning.
Residents living near rivers, creeks, or in historically flood-prone zones are urged to remain vigilant. Precipitation is expected to continue into Thursday, especially on the north shore, as Arthur's remnants move northeast while trailing tropical moisture across the region.
Topics
Why This Matters
This system poses a direct and immediate threat to life and property in Southeast Louisiana, where saturated ground and elevated rivers increase flash flood risk. Residents in flood-prone zones, especially near rivers and creeks, must prepare for potential evacuations and monitor alerts through Thursday. The tornado watch adds an additional layer of danger, requiring vigilance for brief, intense storms that can strike with little warning.
Timeline & Sources
Jun 18, 2026
WireHeavy downpours and tornado threat continue overnight into Thursday morning
Jun 18, 2026
WireFOX 8 Live WVUE reports Arthur's effects ongoing
Jun 18, 2026
WireTornado Watch expires
Jun 19, 2026
WireFlood Watch in effect through Friday morning