Alert archive / New York / Flash Flood Watches in 2021
Flash Flood Watch 3, NWS Buffalo, NY
NWS Buffalo, NY issued this flash flood watch at Aug 17, 2021, 2:59 PM EDT for 8 counties in New York. It took effect at Aug 18, 2021, 8:00 AM EDT. It was in force for 24 hr.
The area
The counties it named.
The facts
- Issued
- Aug 17, 2021, 2:59 PM EDT (18:59 UTC)
- In effect from
- Aug 18, 2021, 8:00 AM EDT
- Expired
- Aug 19, 2021, 8:00 AM EDT
- In force
- 24 hr
- Issued by
- NWS Buffalo, NY
- Flood severity
- None
Counties Allegany County, NY, Cattaraugus County, NY, Cayuga County, NY, Lewis County, NY, Livingston County, NY, Ontario County, NY, Oswego County, NY, Wayne County, NY
The radar
The Binghamton radar (KBGM), 123 km from the middle of the area, began a volume at 19:02 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The nearest sounding before it
Buffalo Intl Airport, NY (KBUF), launched 12:00Z, 7.0 hours before the alert went out and 128 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 418 J/kg
- Mixed-layer CIN
- -6 J/kg
- Mixed-layer LCL
- 603 m above ground
- 0-6 km bulk shear
- 18 kt
- 0-1 km storm-relative helicity
- 41 m²/s²
- 0-3 km storm-relative helicity
- 48 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
The text
As transmitted.
081 WGUS61 KBUF 171859 FFABUF URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service Buffalo NY 259 PM EDT Tue Aug 17 2021 NYZ004>006-008-013-014-020-021-180300- /O.NEW.KBUF.FF.A.0003.210818T1200Z-210819T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Wayne-Northern Cayuga-Oswego-Lewis-Livingston-Ontario-Cattaraugus- Allegany- Including the cities of Geneseo, Oswego, Olean, Newark, Lowville, Wellsville, Fair Haven, and Canandaigua 259 PM EDT Tue Aug 17 2021 ...FLASH FLOOD WATCH IN EFFECT FROM WEDNESDAY MORNING THROUGH THURSDAY MORNING... The National Weather Service in Buffalo has issued a * Flash Flood Watch for portions of central and western New York, including the following counties, in central New York, Lewis, Northern Cayuga and Oswego. In western New York, Allegany, Cattaraugus, Livingston, Ontario and Wayne. * From Wednesday morning through Thursday morning. * Widespread heavy rain of 1 to 3 inches with localized amounts of 4 inches is expected as the remnants of Tropical Storm Fred impact the Southern Tier to the Finger Lakes and into the North Country Wednesday through Wednesday night. * Runoff from heavy rain may cause rapid rises on creeks and streams, leading to flash flooding. The heavy rain may also result in flooding of poor drainage areas and low-lying areas. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ JLA
6 follow-up statements
523 WGUS61 KBUF 180140 FFABUF Flood Watch National Weather Service Buffalo NY 940 PM EDT Tue Aug 17 2021 NYZ004>006-008-013-014-020-021-180945- /O.CON.KBUF.FF.A.0003.210818T1200Z-210819T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Wayne-Northern Cayuga-Oswego-Lewis-Livingston-Ontario-Cattaraugus- Allegany- Including the cities of Geneseo, Oswego, Olean, Newark, Lowville, Wellsville, Fair Haven, and Canandaigua 940 PM EDT Tue Aug 17 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT FROM 8 AM EDT WEDNESDAY THROUGH THURSDAY MORNING... The Flash Flood Watch continues for * Portions of central and western New York, including the following counties, in central New York, Lewis, Northern Cayuga and Oswego. In western New York, Allegany, Cattaraugus, Livingston, Ontario and Wayne. * From 8 AM EDT Wednesday through Thursday morning. * Widespread heavy rain of 1 to 2 inches with localized amounts of over 3 inches is possible as the remnants of Tropical Storm Fred impact the Southern Tier to the Finger Lakes and into portions of the North Country Wednesday through Wednesday night. * Runoff from heavy rain may cause rapid rises on creeks and streams, leading to flash flooding. The heavy rain may also result in flooding of poor drainage areas and low-lying areas. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ Hitchcock
991 WGUS61 KBUF 180842 FFABUF Flood Watch National Weather Service Buffalo NY 442 AM EDT Wed Aug 18 2021 NYZ004>006-008-013-014-020-021-181700- /O.CON.KBUF.FF.A.0003.210818T1200Z-210819T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Wayne-Northern Cayuga-Oswego-Lewis-Livingston-Ontario-Cattaraugus- Allegany- Including the cities of Geneseo, Oswego, Olean, Newark, Lowville, Wellsville, Fair Haven, and Canandaigua 442 AM EDT Wed Aug 18 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT FROM 8 AM EDT THIS MORNING THROUGH THURSDAY MORNING... The Flash Flood Watch continues for * Portions of central and western New York, including the following counties, in central New York, Lewis, Northern Cayuga and Oswego. In western New York, Allegany, Cattaraugus, Livingston, Ontario and Wayne. * From 8 AM EDT this morning through Thursday morning. * Widespread heavy rain of 1 to 2 inches with localized amounts of over 3 inches is possible as the remnants of Tropical Storm Fred impact the Southern Tier to the Finger Lakes and into portions of the North Country through tonight. * Runoff from heavy rain may cause rapid rises on creeks and streams, leading to flash flooding. The heavy rain may also result in flooding of poor drainage areas and low-lying areas. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ RSH
143 WGUS61 KBUF 181450 FFABUF Flood Watch National Weather Service Buffalo NY 1050 AM EDT Wed Aug 18 2021 NYZ004>006-008-013-014-020-021-190000- /O.CON.KBUF.FF.A.0003.000000T0000Z-210819T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Wayne-Northern Cayuga-Oswego-Lewis-Livingston-Ontario-Cattaraugus- Allegany- Including the cities of Geneseo, Oswego, Olean, Newark, Lowville, Wellsville, Fair Haven, and Canandaigua 1050 AM EDT Wed Aug 18 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH THURSDAY MORNING... The Flash Flood Watch continues for * Portions of central and western New York, including the following counties, in central New York, Lewis, Northern Cayuga and Oswego. In western New York, Allegany, Cattaraugus, Livingston, Ontario and Wayne. * Through Thursday morning. * Widespread heavy rain of 1 to 2 inches with localized amounts of over 3 inches is possible as the remnants of Tropical Storm Fred impact the Southern Tier to the Finger Lakes and into portions of the North Country through tonight. * Runoff from heavy rain may cause rapid rises on creeks and streams, leading to flash flooding. The heavy rain may also result in flooding of poor drainage areas and low-lying areas. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ JLA
815 WGUS61 KBUF 182309 FFABUF Flood Watch National Weather Service Buffalo NY 709 PM EDT Wed Aug 18 2021 NYZ004>006-008-013-014-020-021-190900- /O.CON.KBUF.FF.A.0003.000000T0000Z-210819T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Wayne-Northern Cayuga-Oswego-Lewis-Livingston-Ontario-Cattaraugus- Allegany- Including the cities of Geneseo, Oswego, Olean, Newark, Lowville, Wellsville, Fair Haven, and Canandaigua 709 PM EDT Wed Aug 18 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH THURSDAY MORNING... The Flash Flood Watch continues for * Portions of central and western New York, including the following counties, in central New York, Lewis, Northern Cayuga and Oswego. In western New York, Allegany, Cattaraugus, Livingston, Ontario and Wayne. * Through Thursday morning. * Widespread heavy rain of 1 to 2 inches with localized amounts of over 3 inches is expected as the remnants of Tropical Storm Fred impact the Southern Tier to the Finger Lakes and into portions of the eastern Lake Ontario region tonight through early Thursday morning. * Runoff from heavy rain may cause rapid rises on creeks and streams, leading to flash flooding. The heavy rain may also result in flooding of poor drainage areas and low-lying areas. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ Hitchcock
023 WGUS61 KBUF 190823 FFABUF Flood Watch National Weather Service Buffalo NY 423 AM EDT Thu Aug 19 2021 NYZ004-013-014-020-021-190930- /O.CAN.KBUF.FF.A.0003.000000T0000Z-210819T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Wayne-Livingston-Ontario-Cattaraugus-Allegany- Including the cities of Newark, Olean, Canandaigua, Geneseo, and Wellsville 423 AM EDT Thu Aug 19 2021 ...FLASH FLOOD WATCH IS CANCELLED... The Flash Flood Watch for a portion of western New York, including the following areas, Allegany, Cattaraugus, Livingston, Ontario and Wayne has been cancelled. The Flood Watch is cancelled. Please remain alert for any road closures. $$ NYZ005-006-008-191200- /O.CON.KBUF.FF.A.0003.000000T0000Z-210819T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Northern Cayuga-Oswego-Lewis- Including the cities of Fair Haven, Oswego, and Lowville 423 AM EDT Thu Aug 19 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL 8 AM EDT THIS MORNING... The Flash Flood Watch continues for * A portion of central New York, including the following counties, Lewis, Northern Cayuga and Oswego. * Until 8 AM EDT this morning. * Up to an additional inch of rain is possible through this morning. This combined with previous rainfall has the potential to cause flooding. * Runoff from heavy rain may cause rapid rises on creeks and streams, leading to flash flooding. The heavy rain may also result in flooding of poor drainage areas and low-lying areas. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ Apffel
738 WGUS61 KBUF 191156 FFABUF Flood Watch National Weather Service Buffalo NY 756 AM EDT Thu Aug 19 2021 NYZ005-006-008-191300- /O.EXP.KBUF.FF.A.0003.000000T0000Z-210819T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Northern Cayuga-Oswego-Lewis- Including the cities of Fair Haven, Oswego, and Lowville 756 AM EDT Thu Aug 19 2021 ...FLASH FLOOD WATCH WILL EXPIRE AT 8 AM EDT THIS MORNING... The Flash Flood Watch for a portion of central New York, including the following areas, Lewis, Northern Cayuga and Oswego will expire at 8 AM EDT this morning. The Flood Watch is cancelled as the potential for widespread flooding is ending. Some local areas are still experiencing flooding though, so please continue to heed ongoing warnings and road closures. $$ JLA
The office that day
Everything else NWS Buffalo, NY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 17, 8:01 AM EDT | Special Weather Statement | BUF | Jefferson | 74 min |
| Aug 17, 3:08 PM EDT | Special Weather Statement | BUF | Monroe | 37 min |
| Aug 17, 3:54 PM EDT | Special Weather Statement | BUF | Wayne | 66 min |
| Aug 17, 4:17 PM EDT | Flash Flood Warning | BUF | Cayuga, Ontario, Wayne | 86 min |
| Aug 17, 4:48 PM EDT | Special Weather Statement | BUF | Cayuga | 42 min |
Nearby
Flash Flood Watches in New York, 2021Every flash flood watch in 2021
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.