New York, 2023

Flash Flooding in New York, July 10, 2023

July 10, 2023 · NWS BUF · 5 events in 1 county or zone

A sharp upper level disturbance helped spawn slow moving showers and thunderstorms southeast of Lake Ontario over Oswego county. Very heavy rain was centered over central portions of Ontario County.

Where it happened

Every event with a place to put it. Tap one for its entry below.

  • Tornadoes
  • Tropical storms and surge
  • Floods
  • Wind
  • Hail
  • Winter weather
  • Heat and drought
  • Cold
  • Fire, smoke and dust
  • Marine and coastal
  • Other

Open the live radar over this ground

The toll

Deaths
0
Injuries
0
Property damage
None recorded
Crop damage
None recorded
Events
5

Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.

What happened

The episode as NWS BUF wrote it up.

A sharp upper level disturbance helped spawn slow moving showers and thunderstorms southeast of Lake Ontario over Oswego county. Very heavy rain was centered over central portions of Ontario County. There were numerous reports of closed roads. The highest rainfall reports received were 4.54 inches near Palermo and Phoenix with 3.54 inches near Mexico.

What forecasters said that day

The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Buffalo, NY wrote its last area forecast discussion before the first event at Jul 10, 10:25 AM EST, 1 hour 35 minutes earlier.

Area forecast discussion, Jul 10, 10:25 AM EST, 1 hour 35 minutes before
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Hazardous weather outlook, Jul 10, 10:17 AM EST, 1 hour 43 minutes before
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In the hours before

Special weather statement, Jul 10, 8:22 AM EST, 3 hours 38 minutes before
Special Weather Statement
National Weather Service Buffalo NY
922 AM EDT Mon Jul 10 2023

NYZ006-101415-
Oswego NY-
922 AM EDT Mon Jul 10 2023

...Drenching thunderstorms will impact portions of southern Oswego
County through 1015 AM EDT...

At 920 AM EDT, Doppler radar was tracking thunderstorms with heavy
rain along a line extending from near Mexico Point State Park to
near Cicero. Movement of the line of storms was generally to the
east at 15 to 20 mph.

HAZARD...Winds in excess of 30 mph and tropical downpours.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects.

Locations impacted include...
Central Square, Redfield, Mexico Point State Park, Selkirk Shores
State Park, Hastings, Constantia, West Monroe, New Haven, Mexico,
Williamstown, Cleveland, Parish, Altmar, Amboy Center, Howardville,
Mallory, Gayville, Kasoag, Bernhards Bay, and Lower South Bay.

This includes Interstate 81 between exits 32 and 35.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Torrential rainfall is occurring with these storms and may lead to
localized flooding. One to two inches of rain will be possible with
these storms and will fall over the same areas where heavy rain fell
on Sunday. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4348 7581 4333 7589 4332 7586 4315 7588
      4316 7592 4317 7593 4318 7600 4320 7604
      4320 7608 4323 7610 4327 7621 4321 7620
      4357 7637 4356 7631 4356 7629 4353 7578
      4347 7577
TIME...MOT...LOC 1320Z 258DEG 15KT 4349 7628 4318 7608

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...30 MPH

RSH
Special weather statement, Jul 10, 9:13 AM EST, 2 hours 47 minutes before
Special Weather Statement
National Weather Service Buffalo NY
1013 AM EDT Mon Jul 10 2023

NYZ006-101515-
Oswego NY-
1013 AM EDT Mon Jul 10 2023

...Drenching thunderstorms will impact portions of Oswego County
through 1115 AM EDT...

At 1010 AM EDT, Doppler radar continued to display an axis of heavy
rain and embedded thunderstorm activity extending from near Pulaski
to near Brewerton. Movement of the line was nearly stationary to
moving east at 5 mph.

HAZARD...Winds in excess of 30 mph and heavy rain.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects.

Locations impacted include...
Sandy Island Beach State Park, Pulaski, Central Square, Redfield,
Selkirk Shores State Park, Mexico Point State Park, Hastings,
Richland, Constantia, West Monroe, Mexico, Williamstown, Orwell,
Sandy Creek, Cleveland, Lacona, Parish, Altmar, and Amboy Center.

This includes Interstate 81 between exits 32 and 37.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Torrential rainfall is also occurring with these storms and may lead
to localized flooding. Over an inch of rain has fallen in parts of
southern Oswego county, including an inch and a half in Central
Square. An additional inch of rain will be possible for parts of the
county. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4348 7581 4333 7589 4332 7586 4315 7588
      4316 7592 4317 7593 4318 7600 4320 7604
      4320 7608 4323 7610 4324 7616 4327 7620
      4356 7630 4356 7628 4358 7626 4368 7626
      4366 7578 4347 7576
TIME...MOT...LOC 1410Z 265DEG 5KT 4350 7611 4324 7603

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...30 MPH

RSH

The radar

The national radar mosaic for the moment the first event began.

Open the radar archive at this moment

Event by event

5 flash flood. Local standard time, as filed.

Flash Flood, Oswego

When
July 10, 12:00 PM EST to 1:15 PM EST
Where
Oswego County, 1.68 mi N of Colosse to 1.66 mi N of Colosse
Cause
Heavy Rain
Reported by
Broadcast Media
Coordinates
43.444, -76.174

La Casse Road closed due to flooding.

Flash Flood, Oswego

When
July 10, 12:10 PM EST to 1:15 PM EST
Where
Oswego County, 0.88 mi SW of Mexico to 0.9 mi SW of Mexico
Cause
Heavy Rain
Reported by
911 Call Center
Coordinates
43.460, -76.241

Ames Street is closed due to flooding.

Flash Flood, Oswego

When
July 10, 12:10 PM EST to 1:00 PM EST
Where
Oswego County, 0.63 mi SSE of Mexico to 0.64 mi SSE of Mexico
Cause
Heavy Rain
Reported by
911 Call Center
Coordinates
43.461, -76.228

County Route 41 in Mexico is closed due to flooding.

Flash Flood, Oswego

When
July 10, 12:10 PM EST to 1:10 PM EST
Where
Oswego County, 1.22 mi SE of Mexico to 0.96 mi SE of Mexico
Cause
Heavy Rain
Reported by
Broadcast Media
Coordinates
43.460, -76.210

State Route 104 closed in Mexico between Emery Road and Standpipe Road due to flooding.

Flash Flood, Oswego

When
July 10, 12:15 PM EST to 1:15 PM EST
Where
Oswego County, 1.09 mi SSE of Parish to 1.19 mi SSE of Parish
Cause
Heavy Rain
Reported by
Broadcast Media
Coordinates
43.406, -76.119

On ramp to I-81 south at the Parish exit is closed due to flooding.

What these are

Flash Flood
Flooding that begins within six hours of the rain that causes it, or of a dam or levee failure or ice jam release, often with deadly speed.

After NWS Directive 10-1605, the rules offices file Storm Data by.

The same day elsewhere

More

Every storm in New York in 2023Every state in 2023This day in weather historyWarnings in New York, July 2023

Sources

NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-10-01. Each event’s entry at NCEI: 1117179, 1117176, 1117178, 1117185, 1117184.