Flash Flood — St. Tammany, Louisiana

2001-06-11 · near Countywide, St. Tammany, Louisiana

Event narrative

Severe flooding developing primarily in the southeast portion of St. Tammany Parish. Numerous streets were impassable. Parish officials estimate that over 1000 houses were flooded, primarily in the Slidell area.

Wider weather episode

Remnants of Tropical Storm Allison moved across southeast Louisiana during the night of June 10/11th. The circulation system strengthened and produced torrential rainfall in many locations of extreme southeast Louisiana. Rainfall of 5 to 10 inches fell overnight from Lafourche and Terrebonne Parishes northeastward across the New Orleans area and into St. Tammany and Washington Parishes. Runoff from the heavy rainfall produced flash flooding in many areas, with eastern St. Tammany Parish particularly hard hit. Heavy rainfall caused the Bogue Falaya River at Covington, St. Tammany Parish, to exceed flood stage from June 8th through June 13th. The river actually crested twice, once on June 8th and again on June 11th, approaching near record leves and producing major flooding.

Source: NOAA Storm Events Database, event_id 5256518. Narrative written by the NWS forecast office that issued the report.