* WHAT...Heat index values up to 112 expected.
* WHERE...All of southeast Louisiana and southern Mississippi.
* WHEN...From 11 AM this morning to 8 PM CDT this evening.
* IMPACTS...Hot temperatures and high humidity may cause heat
illnesses.
Heat Advisory
Until 2026-08-22T16:45:00-05:00
•
National Weather Service
* WHAT...Heat index values up to 112 expected.
* WHERE...All of southeast Louisiana and southern Mississippi.
* WHEN...From 11 AM this morning to 8 PM CDT this evening.
* IMPACTS...Hot temperatures and high humidity may cause heat
illnesses.
BAYOU LAFOURCHE SW OF DONALDSONVILLE, LA
Realtime Data
•
Report
•
Conditions
258
Discharge (cfs)
7.5
Gauge Height (ft)
Streamflow discharge was last observed at 281 cfs, and a gauge height of 7.47 feet.
With the
% decrease since yesterday,
the streamflow average over the past 10 days is 267 .
Weather today, Tomorrow,
The primary constituents of the flow are rainfall, surface water runoff, and groundwater discharge. The bayou is fed by several tributaries, including Bayou des Allemands and Bayou Lafourche North. There are no major dams along the bayou. Seasonal trends show that flow decreases during the dry season (fall and winter) and increases during the wet season (spring and summer). Interestingly, the bayou was once used as a major transportation route, with steamboats carrying goods and passengers between New Orleans and other towns along the bayou.
August 22, 2026
Elevation
9.0 ft
Last Updated
Gage height, ft
7.47 ft
Precipitation, total, in
0.0 in
Stream water level elevation above NAVD 1988, in ft