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1/24/2024
WT Staff
HAPPENING NOW
NWS: Flood Watch in effect
Bayou Dorcheat flooding near Springhill
Water news for Wednesday, January 24, 2024 - last updated 314 pm CST
National Weather Service Hazardous Weather Outlook issued 231 am CST Jan 23
FLOOD WATCH NOW IN EFFECT THROUGH THURSDAY AFTERNOON...Flooding caused by excessive rainfall continues to be possible in portions of southeast Louisiana, including the following Parishes:
Assumption, Central Plaquemines, Central Tangipahoa, East Baton Rouge, East Feliciana, Eastern Ascension, Eastern Orleans, Iberville, Lower Jefferson, Lower Tangipahoa, Lower Terrebonne, Northern Livingston, Northern St. Tammany, Northern Tangipahoa, Pointe Coupee, Southeast St. Tammany, Southern Livingston, Southwestern St. Tammany, St. Charles, St. Helena, St. James, St. John The Baptist, Upper Jefferson, Upper Lafourche, Upper St. Bernard, Upper Terrebonne, Washington, West Baton Rouge, West Feliciana, Western Ascension and Western Orleans and southern Mississippi, including the following areas, Amite, Northern Hancock, Northern Harrison, Northern Jackson, Pearl River, Pike, Southern Hancock, Southern Harrison, Southern Jackson, Walthall and Wilkinson Counties.
IMPACTS - Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations.
ADDITIONAL DETAILS... http://www.weather.gov/safety/flood
PRECAUTIONARY/PREPAREDNESS ACTIONS...You should monitor later forecasts and be alert for possible Flood Warnings. Those living in areas prone to flooding should be prepared to take action should flooding develop.
Streamflow Situation from USGS real-time streamflow monitoring stations around the eight watersheds of the state
Bayou Dorcheat breached minor flood stage near Springhill in Region 1 just before 9pm CST last night. As of Wednesday afternoon, Bayou Dorcheat is running two feet over flood stage, levelling off now. Paw Paw Bayou, also in Region 1 Caddo Parish is flowing at 99th percentile, joined by Cypress Bayou flowing 99th percentile near Keithville. Bayou San Patricio in Region 4 is flowing above the 99th percentile near Benson, a foot deeper at 3 pm than six hours prior.
Check black tags for flood, blue tags for 99th percentile flows with levels updated through the day.
Tangipahoa River is no longer flowing low at Robert, flow returned to normal rating since our morning update. This area is under a flood watch, check blue and black tags on the map for updated high flow and flood levels. More to follow.
Drought Map from USGS 7-day average streamflows compared to historic averages
Extreme drought ratings remain on Region 3 Tensas River channel and Region 7 Tangipahoa River channel midweek with a National Weather Service flood watch issued and flooding due to excessive rainfall underway in the northwest.
Severe drought ratings still apply through the west, Region 4 and most of Region 5. Acadia and Evangeline Parishes are rated moderate drought.
Moderate drought applies in Region 2 Grant and LaSalle, and remains on three Parishes west of Tensas River in Region 3, Morehouse, Richland and Frankin Parishes. Region 1 has cleared the drought map overnight as most streamflows there are showing above 95th percentile and one site recognizes flooding. The drought map will change rapidly with this rain event, more to follow.
Region 7 is still rated below normal Wednesday in all surface area except Tangipahoa Parish, rated extreme drought. Central Washington Parish has joined the rest of Region 7 overnight at the below normal rating. This is likely to shift with the rainfall and potential flooding today and tomorrow. Watershed regions 6 and 8 are unrated on the drought map today.
Red-brown tags on the map refer to extreme low flows.
Note WaterToday reports day-to-day changes recorded by USGS streamflow monitors on rivers and tributaries located in Louisiana, along with monitors upstream in the Mississippi River basin: Ohio, Georgia and southwest New York state. USGS creates a drought map from 7-day average streamflow readings, by comparing the average with the historic weekly normal flow value for each location. The drought ratings are below normal, moderate hydrologic drought, severe drought and extreme drought.
USGS Provisional Data Statement
Data are provisional and subject to revision until they have been thoroughly reviewed and received final approval. Current condition data relayed by satellite or other telemetry are automatically screened to not display improbable values until they can be verified.
Provisional data may be inaccurate due to instrument malfunctions or physical changes at the measurement site. Subsequent review based on field inspections and measurements may result in significant revisions to the data.
Data users are cautioned to consider carefully the provisional nature of the information before using it for decisions that concern personal or public safety or the conduct of business that involves substantial monetary or operational consequences. Information concerning the accuracy and appropriate uses of these data or concerning other hydrologic data may be obtained from the USGS.
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