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6/10/2024
WT Staff
 HAPPENING NOW
Monday, June 10, 2024
Mandatory testing for HAB toxins underway
June 10, 2024 1046 am CDT
Hazardous Weather Outlook issued 455 am by NWS Shreveport
Isolated to widely scattered showers and thunderstorms will be possible across the region today, behind a weak surface front and near a weak upper level disturbance that will slowly shift south through the area. An isolated strong storm or two can not be ruled out, with locally gusty winds and brief heavy rainfall possible. These showers and thunderstorms will diminish this evening with the loss of heating, and as drier air mixes southwest into the region.
Impacting Caddo-Bossier-Webster-Claiborne-Lincoln-De Soto-
Red River-Bienville-Jackson-Ouachita-Sabine-Natchitoches-Winn-Grant-Caldwell-La Salle Parishes
WT US HABS Tracker
Ohio: Grand Lake beaches have been posted with long term Recreational Public Health advisories for the algal toxin "microcystins", a liver toxin associated with illness in humans and animals. This week marks the first week of mandatory testing for microcystins in raw drinking water supplies. The federal EPA establishes action levels for total microcystins in raw drinking water sources, one level for sensitive populations and another level for the general population. Total Microcystins results for Grand Lake posted to the end of June 8 show a result 44 times above the action level for sensitive populations. Lab test results posted to June 8 for Celina City has total microcystins 13.2 micrograms per liter where the action level is 0.3 for children under 6, pregnant and nursing mothers and those with kidney and liver conditions. The action level for the general population is 1.6, the Celina water supply is eight and a half times over that threshold. Celina City is fortunate to have an alternate, groundwater supply.
For more information on HABs, see WT US coverage area reports:
New York HAB report here
Ohio HAB report here
Louisiana HAB report here
Inquire about microcystins testing in your local water supply.
Current Streamflow Situation
Streamflows run much above seasonal normal to high in the west as twelve monitors continue to record flooding. Region 3 Boeuf River is signalling a below normal flow volume, as is Tangipahoa River at Robert in Region 7. One small area of LA is rated on the drought map Monday, this is Tangipahoa Parish is Region 7. No extreme low flows are recorded as of this report, see below for the flood update.
WT USA Flows and Flood Tracker provisional data from the network of USGS streamflow monitors
Sixty-seven flood events are recorded on the USGS network Monday, down from seventy Sunday. WT USA tracks twelve of these reference flood events through our coverage area in New York, Ohio, Georgia and Louisiana. At the writing of this report, all active flood sites are located in Louisiana.
Louisiana: No change to the flood dashboard overnight, the same twelve stations are recording out of the channel for at least minor flood stage, in some cases moderate flood stage. Watershed Region 7 Pearl River is the latest flood event on the board, still flooding the east border near Bogalusa, the water level there has not changed much in twenty four hours, up slightly to nine plus inches out of the channel. Northwest Region 1 watershed same stations flooding including Caddo Lake and Bayou Bodcau Lake flooding near Mooringsport and Shreveport, respectively. Bayou Dorcheat continues to flood near Springhill and downstream Minden. Region 2 Little River is recorded an inch above the channel near Rochelle. Considering latency in the data upload, this flood may be over as we write. Region 4 west border Sabine River drains a large area of Texas, still flooding near Logansport, Burkeville, Bon Wier and Ruliff. The east side of Region 4 watershed Calcasieu River is flooding near Glenmora and Oberlin. Twelvemile Bayou is still running above 99th percentile near Dixie with no flood stage to reference. Sabine River is above 99th percentile at Toledo Bend Reservoir near Burkeville with no flood stage documented. For more information on the flood trend in Louisiana, see black tags indicating flood flow volume and gauge height, blue tags for 99th percentile flows, updated daily here.
As many drinking water facilities are supplied from surface water reservoirs, the streamflow situation is pertinent to both drinking water supply and quality. High flows can stir up sediment and cause turbidity in the reservoirs, requiring additional treatments to render the water potable. Low flow volume is linked to warmer temperatures in the reservoir and can be an issue for water quality where HABs are present. WT tracks streamflow trends with an eye to the impacts on drinking water supply and quality in each of the state's watersheds. Check the watershed layer on the map to see the direction of flow and streamflows that may be impacting drinking water today.
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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