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8/17/2024
WT Staff
 August 17, 2024 407 pm EDT
NWS: Strong to severe thunderstorms in the north and central state
Hazardous Weather Outlook issued 241 pm Aug 17 by NWS Peachtree City
Isolated to scattered thunderstorms are possible this afternoon
and evening across portions of north and central Georgia. Some
storms may become strong to severe and capable of producing
isolated damaging wind gusts, frequent lightning, and locally
heavy rainfall. A Marginal (level 1 out of 5) risk is in effect.
On Sunday, isolated to scattered thunderstorms are possible across
a majority of the state. Some storms may become strong to severe,
especially south of Interstate 20, and capable of producing
damaging wind gusts and isolated large hail in addition to
frequent lightning and locally heavy rainfall. A Slight Risk (level
2 out of 5) is in effect for portions of central and south
central Georgia.
Spotter activation is not requested but spotters are encouraged
to submit reports of severe weather through the web by going to
weather.gov/atlanta. Please relay any information about observed severe
weather to the NWS while following all local, state, and CDC
guidelines.
Impacting Baldwin-Banks-Barrow-Bartow-Bibb-Bleckley-Butts-Carroll-Catoosa-
Chattahoochee-Chattooga-Cherokee-Clarke-Clayton-Cobb-Coweta-
Crawford-Crisp-Dade-Dawson-DeKalb-Dodge-Dooly-Douglas-Emanuel-
Fannin-Fayette-Floyd-Forsyth-Gilmer-Glascock-Gordon-Greene-
Gwinnett-Hall-Hancock-Haralson-Harris-Heard-Henry-Houston-Jackson-
Jasper-Jefferson-Johnson-Jones-Lamar-Laurens-Lumpkin-Macon-
Madison-Marion-Meriwether-Monroe-Montgomery-Morgan-Murray-
Muscogee-Newton-North Fulton-Oconee-Oglethorpe-Paulding-Peach-
Pickens-Pike-Polk-Pulaski-Putnam-Rockdale-Schley-South Fulton-
Spalding-Stewart-Sumter-Talbot-Taliaferro-Taylor-Telfair-Toombs-
Towns-Treutlen-Troup-Twiggs-Union-Upson-Walker-Walton-Warren-
Washington-Webster-Wheeler-White-Whitfield-Wilcox-Wilkes-
Wilkinson Counties
Thirty-eight USGS streamflow monitors are recording active flooding in the USA Saturday afternoon with five floodings recorded in the reference network in Georgia. These monitored sites allow us a view on the water volume and level above flood stage, the flow trajectory and history toward an idea of peak flow, rate of decline, when flooding may end or when flows are on the rise again.
Atlantic basin major rivers continue to overflow in Chatham, Atkinson and Charlton Counties, the Gulf of Mexico drainage area flooding in Clinch County. In Chatham County, Ogeechee River is almost back in the channel, may be out of flood stage as this update is written.
Little Satilla River is back inside the channel near Offerman as of 1030 pm last night. Satilla River is still two feet over flood stage at the monitoring site named for Atkinson County.
St Mary's River is down to five inches above the channel near MacClenny, FL, possibly out of flooding here tomorrow. Downstream at Folkston Landing still four feet over the channel, losing about a foot every 24 hours. Gulf of Mexico feeder Suwannee River runs a foot above flood stage and declining rapidly at US441 near Fargo.
Municipal and private groundwater wells in Chatham, Atkinson, Charlton and Clinch Counties have been impacted by this flood and will require intervention to restore potability when the flood waters have fully receded. Wells supplying public utilities are managed as per the Safe Drinking Water Act, boil water advisories are in place until the flood subsides and tests confirm potability of the water supply. For those on private wells, the flood water must fully recede from around the well head before the surrounding surface area, casings and the water itself can be sanitized. Advice for disinfecting wells from Georgia Coastal Health here.
Watch for water advisories in your local area whenever water service has been disrupted or the water pressure drops for any reason. Flush stagnant water from the lines by running the water for several minutes after service is restored. As a precautionary measure for drinking water, maintain water for minimum of one minute at a rolling boil to sanitize potential microbiological contamination.
WT HAB Tracker
from the satellite monitoring program of the NOAA National Centers for Coastal Ocean Science(NCCOS) and State sources where available
Georgia: from Coastal Health Region
No new information has been found pertaining to bluegreen algae reports in Georgia since our last update. Georgia Environmental Protection Division has not responded to our last inquiries on bluegreen, we had no response by publication time. GA EPD does accept reports from the public of suspicious algal blooms. Given the prevalence of cyanobacteria and cyanotoxins all over North America, it is likely that there are HABs in Georgia as well, these may be under-reported. We encourage anyone with an observation of a suspicious algal bloom to send us an email info@wtga.us.
New York
The latest image of Lake Champlain was captured August 16, a mostly cloud obscured image at unknown wind speed. A previous image August 14 is a clear view of northeast Baie Missisquoi appears full of bluegreen algae at extreme high concentration 1 to 3 million cells per 100 ml on both sides of the international border. This bloom reaches south as far as the channel from North Hero Island to Isle la Motte, the south portion of the bloom at 900 thousand cells per 100 ml. St Albans Bay HAB is partially cloud obscured, we see the inner shoreline edge at 1 million cells per 100 ml. Lake Carmi appears clear with no HAB activity; Shelburne Pond is still rocking 2 million cells concentration in Vermont. See our latest report here.
From the NYS Department of Environmental Conservation: 168 active bluegreen algal blooms are confirmed in New York Saturday afternoon, up from 163 yesterday. First HABs of the season have been confirmed for Hemlock Lake, Barnum Pond and Lake Tonetta, to date 497 HABs have been archived in 2024, including all reports made prior to August 4. See the impacted water bodies list here.
Lake Erie west basin
The latest image from NCCOS was captured August 16 at wind speed 14.6, completely cloud obscured. A prior image captured Aug 15 offers a view of the southwest water between clouds. This visible part of the HAB presents with concentration 1 million cells around the North Maumee Bay to 600 thousand cells per 100 ml north of Monroe. The Aug 14 image is clear and taken at a lower wind speed, revealing the full extent of the HAB with extreme high concentration hot spots up to 6 million cells per 100 ml, see the satellite image here.
Louisiana: The latest upload from the NCCOS was captured August 16 at wind speed 7 mph. This image is clear, showing Lac des Allemands and Bayou Fortier at a new high concentration, 4 to 5 million inside the west bay shoreline and Bayou Fortier north shore. Lakes Pontchartrain and Maurepas are partially cloud obscured, no HAB visible. Check out the latest satellite image from NCCOS here.
California: WTCAL connected with Director of EPA for Big Valley Pomo Tribe for an update on Clear Lake. Sarah Ryan has been heading up the cyanotoxin surveillance program at Clear Lake, a popular tourist destination north of San Francisco. Big Valley EPA has been engaged in monitoring for the bluegreen algae, communicating observations with the local population and tourists, communicating with California Water Quality Monitoring Board and directly to the public for more than a decade.
During this time, Big Valley has been investing in regular lab testing for cyanotoxins, acquiring an astute understanding of their water body, including the resident cyanobacteria present at any given time, along with the most critical factor, the levels of various cyanotoxins present. Big Valley tests for specific liver toxins and neurotoxins based on first geno-typing the bloom itself. Access to regular toxin surveillance in Clear Lake makes this one of a very small number of sites for which we can match a visual HAB observation with a toxin level. This work is in progress, more to follow.
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