8/19/2024
WT Staff
 August 19, 2024 updated 638 pm EDT
NWS: Flash flooding possible for southeast including NYC and Long Island today
Hazardous Weather Outlook issued 520 am Aug 19 by NWS New York
Numerous showers and scattered thunderstorms are expected to
develop ahead of an approaching cold front this afternoon into
evening. This will bring potential for isolated severe thunderstorms
with damaging wind gusts and localized flash flooding this afternoon
into evening. The most vulnerable areas for flood impacts will be
across southwestern CT, northeastern NJ, and much of Long Island due
to saturated soils and high streamflows.
Impacting Orange-Putnam-Rockland-
Northern Westchester-Southern Westchester-New York (Manhattan)-Bronx-
Richmond (Staten Island)-Northwest Suffolk-Northeast Suffolk-
Northern Queens-Northern Nassau Counties
Streamflow Situation from the USGS network of streamflow gauges in New York State
High flows recorded on Long Island increased overnight at Cold Spring Harbor and Massapequa. According to USGS New York Water Science Center there are flow monitoring stations in these locations reporting above the 99th percentile. Those reported here yesterday are still elevated and rated high flow, including sites in Mill Neck, Valley Stream, Freeport and Bellmore. Flood stages are not established for these sites. The hazardous weather outlook for Long Island today includes the possibility of flash flooding due to more rain expected to land on saturated soils. Be prepared for short term flood conditions, watch for further alerts and use caution around flooded roads, do not drive in flood water. More to follow.
WT HAB Tracker
From NYS Department of Environmental Conservation: Active HAB reports have dropped off to 139 overnight as reports lodged prior to August 5 found their way to the archives. New to the impacted water bodies list for this season are Niger Pond in Suffolk County, unnamed water bodies near Grandyle Village in Erie County and Jamaica Hill in Queens. See the impacted water bodies list here, updates are in progress.
from the satellite monitoring program of the NOAA National Centers for Coastal Ocean Science(NCCOS) and State sources where available
New York
The latest image of Lake Champlain was captured yesterday, Aug 18 under heavy cloud conditions. Apiece of the northeast Baie Missisquoi HAB is visible in a cloud break, the concentration down to 600 thousand cells per 100 ml. The last clear image was acquired August 14, this same bluegreen bloom on that date at concentration 1 to 3 million cells per 100 ml. See our NY HAB report here.
Lake Erie west basin
Ohio Department of Health has issued Recreational Health Advisories for Maumee Bay State Park and South Bass Island State Park. The ELISA test for Maumee Bay State Park sample taken on August 13 returned a total microcystins level 50 ug/L, in the area the satellite monitoring program has been demonstrating a high concentration HAB. South Bass Island State Park is also under an algal toxin advisory Monday, the level measured here on August 14 being 35.6 ug/L, this sample was collected August 14. A six day latency period evident here, from sampling to advisory being issued. Microcystins is a toxin that affects the kidneys and liver. According to the World Health Organization, exposure to the hepatotoxin causes damage to vital organs that may not be felt by way of symptoms including skin rash and nausea until damage to the liver has occurred. Dogs are especially sensitive to these toxins, there is no treatment for cyanotoxin poisoning. Follow the guidance on any Recreational Health Advisory issued, for health and safety, people and pets should have no contact with this water.
The latest satellite image of Lake Erie West basin was captured August 19 at very high wind speed, 21.1 mph. This and the previous image snapped yesterday are mostly cloud obscured with bits and pieces of bluegreen bloom showing up in the cloud breaks. The patchy information from the August 19 image shows concentration around 1 million cells per 100 ml around Maumee Bay and North Maumee Bay, around 500 to 600 thousand cells per 100 ml in open water.
See the NCCOS images here.
Louisiana: The latest upload from the NCCOS is a perfectly clear image captured August 18 at low wind speed 2 mph, Lac des Allemands and Bayou Fortier hotspots have expanded in area and increased in concentration in both water bodies. The highest concentrations interpreted from the latest picture exceed 4 millon cells per 100 ml. Lakes Pontchartrain and Maurepas remain void of bluegreen while further south, Field Lake is full of the stuff at increasing concentration, 3 million cells per 100 ml would not be an exaggeration of the status. Check out the latest satellite image from NCCOS here.
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