NEW YORK (CBSNewYork) - Today's flash floods across parts of our area prompted an advisory against swimming at some beaches on Long Island.

The advisory was prompted as a precautionary measure due to stormwater runoff, which can raise bacteria levels.

*14 North Shore Beaches within Nassau County:

• Centre Island Sound – Bayville
• Creek Club – Lattingtown
• Lattingtown Beach – Lattingtown
• Laurel Hollow Beach – Laurel Hollow
• Morgan Sound – Glen Cove
• North Hempstead Beach Park – Port Washington
• Piping Rock Beach Club – Locust Valley
• Pryibil Beach – Glen Cove
• Ransom Beach – Bayville
• Theodore Roosevelt Beach – Oyster Bay
• Sea Cliff Village Beach – Sea Cliff
• Soundside Beach – Bayville
• Stehli Beach – Bayville
• Tappen Beach – Glenwood Landing

*5 South Shore Beaches within Nassau County:

• Biltmore Beach Club – Massapequa
• Hewlett Point Beach – East Rockaway
• Island Park Beach – Island Park
• Merrick Estates Civic Association – Merrick
• Philip Healey Beach – Massapequa

To speak with a Nassau County Health Department representative, weekdays, 9 a.m., - 4:45 p.m., call (516) 227-9717.

Suffolk County issued an advisory at 65 beaches.

• Amityville Village Beach - Babylon, Amityville
• Tanner Park Beach - Babylon, Copiague
• Venetian Shores Beach - Babylon, West Babylon
• Copiague Harbor (Great South Bay) POA - Babylon, Copiague
• Sound Beach POA West - Brookhaven, Sound Beach
• Tides Beach - Brookhaven, Sound Beach
• Beech Road Beach (NSBA) - Brookhaven, Rocky Point
• Broadway Beach (NSBA) - Brookhaven, Rocky Point
• Friendship Drive Beach (NSBA) - Brookhaven, Rocky Point
• Shoreham Village Beach - Brookhaven, Shoreham
• Shoreham Beach - Brookhaven, East Shoreham
• Corey Beach - Brookhaven, Blue Point
• Shirley Beach - Brookhaven, Shirley
• Stony Brook Beach - Brookhaven, Stony Brook
• Shoreham Shore Club Beach - Brookhaven, East Shoreham
• Miller Place Park Beach - Brookhaven, Miller Place
• Scotts Beach - Brookhaven, Sound Beach
• Woodhull Landing POA Beach - Brookhaven, Miller Place
• Bayberry Cove Beach - Brookhaven, Setauket-East Setauket
• Bayview Beach - Brookhaven, Setauket-East Setauket
• Grantland Beach - Brookhaven, Setauket-East Setauket
• Indian Field Beach - Brookhaven, Setauket-East Setauket
• Little Bay Beach - Brookhaven, Setauket-East Setauket
• Soundview Beach Association Beach - Brookhaven, Old Field
• Terraces on the Sound - Brookhaven, Rocky Point
• Havens Beach - East Hampton, Sag Harbor
• Eagle Dock Community Beach - Huntington, Cold Spring Harbor
• Cold Spring Harbor Beach Club Beach - Huntington, Lloyd Harbor
• West Neck Beach - Huntington, Lloyd Harbor
• Lloyd Neck Bath Club Beach - Huntington, Lloyd Harbor
• Lloyd Harbor Village Park Beach - Huntington, Lloyd Harbor
• Gold Star Battalion Park Beach - Huntington, Huntington
• Head of the Bay Club Beach - Huntington, Huntington Bay
• Nathan Hale Beach Club Beach - Huntington, Huntington Bay
• Baycrest Association Beach - Huntington, Huntington Bay
• Bay Hills Beach Association - Huntington, Huntington Bay
• Crescent Beach - Huntington, Huntington Bay
• Knollwood Beach Association Beach - Huntington, Huntington
• Fleets Cove Beach - Huntington, Huntington
• Centerport Beach - Huntington, Centerport
• Huntington Beach Community Association Beach - Huntington, Centerport
• Centerport Yacht Club Beach - Huntington, Centerport
• Steers Beach - Huntington, Northport
• Asharoken Beach - Huntington, Asharoken
• Hobart Beach - Huntington, Northport
• Hobart Beach - Huntington, Eatons Neck
• Crab Meadow Beach - Huntington, Northport
• Wincoma Association Beach - Huntington, Huntington Bay
• Valley Grove Beach - Huntington, Eatons Neck
• Prices Bend Beach - Huntington, Eatons Neck
• West Islip Beach - Islip, West Islip
• Benjamins Beach - Islip, Bay Shore
• Islip Beach - Islip, Islip
• East Islip Beach - Islip, East Islip
• West Oaks Recreation Club Beach - Islip, West Sayville
• Brightwaters Village Beach - Islip, Brightwaters
• Sayville Beach - Islip, Sayville
• Bayport Beach - Islip, Bayport
• Sayville Marina Park Beach - Islip, Sayville
• Bayberry Beach & Tennis Club Beach - Islip, Islip
• Callahan's Beach - Smithtown, Northport
• Short Beach - Smithtown, Nissequogue
• Nissequogue Point Beach - Smithtown, Nissequogue
• Long Beach - Smithtown, Nissequogue
• Schubert Beach - Smithtown, Nissequogue
• Lake Ronkonkoma - Islip, Lake Ronkonkoma

The advisory will be lifted Saturday at 3 p.m., unless bacteria levels remain elevated.

You can also call the Bathing Beach hotline at 631-852-5822, or the Office of Ecology at 631-852-5760 during normal business hours. You can also visit Suffolk County Department of Health Services beach monitoring webpage.