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WT Staff

Saturday, June 15, 2024
NWS: Heat wave coming

June 15, 2024 1001 am EDT

Hazardous Weather Outlook issued 326 am June 15 from National Weather Service forecast center in New York

The first heat wave of the season may start on Tuesday with peak heat index values above 95 possible. Heat will likely continue through the end of the week.

Impacting Orange-Putnam-Rockland-Northern Westchester-Southern Westchester-New York (Manhattan)-Bronx-Richmond (Staten Island)-Kings (Brooklyn)-Northwest Suffolk-Northeast Suffolk-Southwest Suffolk-Southeast Suffolk-Northern Queens-Northern Nassau-Southern Queens-Southern Nassau Counties

Current Streamflow Situation
Much above normal flows have popped up overnight for Long Island, the highest flow values in NYS at 95th and 96th percentile apply to Cold Spring Harbor and Valley Stream. Showers yesterday brought flow ratings back to normal with a distinct reduction in the number of monitors rated much below normal. Below normal flows are sticking around in the west Allegheny and Genesee River watersheds, in the southeast Delaware and Ramapo River watersheds, in the central basin through lower Hudson and Mohawk River watersheds. The lowest streamflows today are found in Genesee River watershed, 2nd percentile value recorded on a tributary near Lakeville. Swan River continues at extreme low flow through East Patchogue in Suffolk County. As of this report, there are no floods observed in the NYS network of streamflow monitors and no extreme high flows.

WT USA Flood Tracker provisional data from the network of USGS streamflow monitors

Twenty-nine streamflow gauges record flows above flood stage through the US monitoring network Saturday, down from thirty-two yesterday. WT USA follows the water levels and volume on three of these reference flood events now, and all three pertain to the state of Louisiana.

Louisiana: Sabine River flooding continues, down two feet overnight near Bon Wier, still two and a half feet above flood stage, overflowing about the same measure above flood stage near Ruliff. Region 1 Bayou Bodcau Lake is settling down slowly, down three inches overnight, presently three feet nine inches over the basin near Shreveport. For more info on the flooding in Louisiana, see black tags indicating flood flow volume and gauge height 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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