Alert archive / New York / Flash Flood Watches in 2021
Flash Flood Watch 2, NWS Buffalo, NY
NWS Buffalo, NY issued this flash flood watch at Jul 16, 2021, 2:41 PM EDT for 14 counties in New York. It took effect at Jul 16, 2021, 11:00 PM EDT. It was in force for 23 hr.
The area
The counties it named.
The facts
- Issued
- Jul 16, 2021, 2:41 PM EDT (18:41 UTC)
- In effect from
- Jul 16, 2021, 11:00 PM EDT
- Expired
- Jul 17, 2021, 10:27 PM EDT
- In force
- 23 hr
- Issued by
- NWS Buffalo, NY
- Flood severity
- None
Counties Allegany County, NY, Cattaraugus County, NY, Cayuga County, NY, Chautauqua County, NY, Erie County, NY, Genesee County, NY, Livingston County, NY, Monroe County, NY, Niagara County, NY, Ontario County, NY, Orleans County, NY, Oswego County, NY, Wayne County, NY, Wyoming County, NY
The radar
The Buffalo radar (KBUF), 69 km from the middle of the area, began a volume at 18:44 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, 6.7 hours before the alert went out and 65 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1011 m above ground
- 0-6 km bulk shear
- 48 kt
- 0-1 km storm-relative helicity
- 45 m²/s²
- 0-3 km storm-relative helicity
- 117 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
094 WGUS61 KBUF 161841 FFABUF URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service Buffalo NY 241 PM EDT Fri Jul 16 2021 NYZ001>006-010>013-019>021-085-170245- /O.NEW.KBUF.FF.A.0002.210717T0300Z-210718T0600Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Niagara-Orleans-Monroe-Wayne-Northern Cayuga-Oswego-Northern Erie- Genesee-Wyoming-Livingston-Chautauqua-Cattaraugus-Allegany-Southern Erie- Including the cities of Orchard Park, Rochester, Geneseo, Buffalo, Oswego, Batavia, Medina, Newark, Olean, Wellsville, Springville, Fair Haven, Jamestown, Niagara Falls, and Warsaw 241 PM EDT Fri Jul 16 2021 ...FLASH FLOOD WATCH IN EFFECT FROM 11 PM EDT THIS EVENING THROUGH LATE SATURDAY NIGHT... 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, Northern Cayuga and Oswego. In western New York, Allegany, Cattaraugus, Chautauqua, Genesee, Livingston, Monroe, Niagara, Northern Erie, Orleans, Southern Erie, Wayne and Wyoming. * From 11 PM EDT this evening through late Saturday night. * An area of low pressure will track northeast across Ohio tonight along a stationary front that stretches all the way east through western and central New York. This area of low pressure will then track east across western NY and the Finger Lakes region on Saturday. Moderate to heavy rain will enter far western NY tonight and then track eastward across the region through Saturday evening. Thunderstorms are possible and due to recent substantial rainfall, localized flooding is a concern. One hour flash flood guidance is 1 to 2 inches across a majority of the region. This could easily be reached, especially if training thunderstorms or organized areas of slow moving heavy rain occur near Metro areas and locations prone to flooding. Rises on rivers and creeks are also expected. However, the rivers and creeks of most concern at this time are the Buffalo Creeks, where minor to even some moderate flooding may occur due to an additional 2 to 2.5 inches of rainfall that is expected by Saturday afternoon. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ JM
6 follow-up statements
455 WGUS61 KBUF 161918 FFABUF URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service Buffalo NY 318 PM EDT Fri Jul 16 2021 NYZ014-170330- /O.EXA.KBUF.FF.A.0002.210717T0300Z-210718T0600Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Ontario- Including the cities of Canandaigua 318 PM EDT Fri Jul 16 2021 ...FLASH FLOOD WATCH IN EFFECT FROM 11 PM EDT THIS EVENING THROUGH LATE SATURDAY NIGHT... The National Weather Service in Buffalo has expanded the * Flash Flood Watch to include a portion of western New York, including the following county, Ontario. * From 11 PM EDT this evening through late Saturday night. * An area of low pressure will track northeast across Ohio tonight along a stationary front that stretches all the way east through western and central New York. This area of low pressure will then track east across western NY and the Finger Lakes region on Saturday. Moderate to heavy rain will enter far western NY tonight and then track eastward across the region through Saturday evening. Thunderstorms are possible and due to recent substantial rainfall, localized flooding is a concern. One hour flash flood guidance is 1 to 2 inches across a majority of the region. This could easily be reached, especially if training thunderstorms or organized areas of slow moving heavy rain occur near Metro areas and locations prone to flooding. Rises on rivers and creeks are also expected. However, the rivers and creeks of most concern at this time are the Buffalo Creeks, where minor to even some moderate flooding may occur due to an additional 2 to 2.5 inches of rainfall that is expected by Saturday afternoon. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ NYZ001>006-010>013-019>021-085-170330- /O.CON.KBUF.FF.A.0002.210717T0300Z-210718T0600Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Niagara-Orleans-Monroe-Wayne-Northern Cayuga-Oswego-Northern Erie- Genesee-Wyoming-Livingston-Chautauqua-Cattaraugus-Allegany-Southern Erie- Including the cities of Orchard Park, Rochester, Geneseo, Buffalo, Oswego, Batavia, Medina, Newark, Olean, Wellsville, Springville, Fair Haven, Jamestown, Niagara Falls, and Warsaw 318 PM EDT Fri Jul 16 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT FROM 11 PM EDT THIS EVENING THROUGH LATE SATURDAY NIGHT... The Flash Flood Watch continues for * Portions of central and western New York, including the following counties, in central New York, Northern Cayuga and Oswego. In western New York, Allegany, Cattaraugus, Chautauqua, Genesee, Livingston, Monroe, Niagara, Northern Erie, Orleans, Southern Erie, Wayne and Wyoming. * From 11 PM EDT this evening through late Saturday night. * An area of low pressure will track northeast across Ohio tonight along a stationary front that stretches all the way east through western and central New York. This area of low pressure will then track east across western NY and the Finger Lakes region on Saturday. Moderate to heavy rain will enter far western NY tonight and then track eastward across the region through Saturday evening. Thunderstorms are possible and due to recent substantial rainfall, localized flooding is a concern. One hour flash flood guidance is 1 to 2 inches across a majority of the region. This could easily be reached, especially if training thunderstorms or organized areas of slow moving heavy rain occur near Metro areas and locations prone to flooding. Rises on rivers and creeks are also expected. However, the rivers and creeks of most concern at this time are the Buffalo Creeks, where minor to even some moderate flooding may occur due to an additional 2 to 2.5 inches of rainfall that is expected by Saturday afternoon. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ JM
608 WGUS61 KBUF 170106 FFABUF Flood Watch National Weather Service Buffalo NY 906 PM EDT Fri Jul 16 2021 NYZ001>006-010>014-019>021-085-170915- /O.CON.KBUF.FF.A.0002.210717T0300Z-210718T0600Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Niagara-Orleans-Monroe-Wayne-Northern Cayuga-Oswego-Northern Erie- Genesee-Wyoming-Livingston-Ontario-Chautauqua-Cattaraugus-Allegany- Southern Erie- Including the cities of Orchard Park, Rochester, Geneseo, Buffalo, Oswego, Batavia, Medina, Newark, Olean, Wellsville, Springville, Fair Haven, Jamestown, Canandaigua, Niagara Falls, and Warsaw 906 PM EDT Fri Jul 16 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH LATE SATURDAY NIGHT... The Flash Flood Watch continues for * Portions of central and western New York, including the following counties, in central New York, Northern Cayuga and Oswego. In western New York, Allegany, Cattaraugus, Chautauqua, Genesee, Livingston, Monroe, Niagara, Northern Erie, Ontario, Orleans, Southern Erie, Wayne and Wyoming. * Through late Saturday night. * An area of low pressure tonight will track northeast across Ohio along a stationary front that stretches all the way east through western and central New York. This area of low pressure will then track east across western NY and the Finger Lakes region on Saturday. Moderate to heavy rain will enter far western NY tonight and then track eastward across the region through Saturday evening. Thunderstorms are possible and due to recent substantial rainfall, localized flooding is a concern. One hour flash flood guidance is 1 to 2 inches across a majority of the region. This could easily be reached, especially if training thunderstorms or organized areas of slow moving heavy rain occur near Metro areas and locations prone to flooding. Rises on rivers and creeks are also expected. However, the rivers and creeks of most concern at this time are the Buffalo Creeks, where minor to even some moderate flooding may occur due to an additional 2 to 2.5 inches of rainfall that is expected by Saturday afternoon. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ DRT
003 WGUS61 KBUF 170806 FFABUF Flood Watch National Weather Service Buffalo NY 406 AM EDT Sat Jul 17 2021 NYZ001>006-010>014-019>021-085-171615- /O.CON.KBUF.FF.A.0002.000000T0000Z-210718T0600Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Niagara-Orleans-Monroe-Wayne-Northern Cayuga-Oswego-Northern Erie- Genesee-Wyoming-Livingston-Ontario-Chautauqua-Cattaraugus-Allegany- Southern Erie- Including the cities of Orchard Park, Rochester, Geneseo, Buffalo, Oswego, Batavia, Medina, Newark, Olean, Wellsville, Springville, Fair Haven, Jamestown, Canandaigua, Niagara Falls, and Warsaw 406 AM EDT Sat Jul 17 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH LATE TONIGHT... The Flash Flood Watch continues for * Portions of central and western New York, including the following counties, in central New York, Northern Cayuga and Oswego. In western New York, Allegany, Cattaraugus, Chautauqua, Genesee, Livingston, Monroe, Niagara, Northern Erie, Ontario, Orleans, Southern Erie, Wayne and Wyoming. * Through late tonight. * Steady rainfall will be heavy at times from the Niagara Frontier to the Rochester area today. Storm total rainfall amounts between 2 and 2.5 inches will be common across this area, and this may result in flash flooding. In addition, water levels will rise on many Buffalo area creeks potentially resulting in flooding. Elsewhere, there's a risk of thunderstorms to produce locally heavy rainfall and flash flooding. * Areas most vulnerable to flooding include urban areas, areas with higher or steep terrain, and areas which received lots of rainfall yesterday. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ Apffel
028 WGUS61 KBUF 171555 FFABUF Flood Watch National Weather Service Buffalo NY 1155 AM EDT Sat Jul 17 2021 NYZ001>006-010>014-019>021-085-180000- /O.CON.KBUF.FF.A.0002.000000T0000Z-210718T0600Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Niagara-Orleans-Monroe-Wayne-Northern Cayuga-Oswego-Northern Erie- Genesee-Wyoming-Livingston-Ontario-Chautauqua-Cattaraugus-Allegany- Southern Erie- Including the cities of Orchard Park, Rochester, Geneseo, Buffalo, Oswego, Batavia, Medina, Newark, Olean, Wellsville, Springville, Fair Haven, Jamestown, Canandaigua, Niagara Falls, and Warsaw 1155 AM EDT Sat Jul 17 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH LATE TONIGHT... The Flash Flood Watch continues for * Portions of central and western New York, including the following counties, in central New York, Northern Cayuga and Oswego. In western New York, Allegany, Cattaraugus, Chautauqua, Genesee, Livingston, Monroe, Niagara, Northern Erie, Ontario, Orleans, Southern Erie, Wayne and Wyoming. * Through late tonight. * Steady rainfall will continue to be heavy at times from the Niagara Frontier to the Rochester area this afternoon. An addtional 1 to 1.5 inches is expected through late today, with storm total rainfall amounts between 2 and 2.5 inches will be common across this area, and this may result in flash flooding. In addition, water levels will continue to rise on many Buffalo area creeks potentially resulting in flooding. Elsewhere, there's a risk of thunderstorms to produce locally heavy rainfall and flash flooding. * Areas most vulnerable to flooding include urban areas, areas with higher or steep terrain, and areas which received lots of rainfall yesterday. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ JM
681 WGUS61 KBUF 172247 FFABUF Flood Watch National Weather Service Buffalo NY 647 PM EDT Sat Jul 17 2021 NYZ001>006-010>014-019>021-085-180600- /O.CON.KBUF.FF.A.0002.000000T0000Z-210718T0600Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Niagara-Orleans-Monroe-Wayne-Northern Cayuga-Oswego-Northern Erie- Genesee-Wyoming-Livingston-Ontario-Chautauqua-Cattaraugus-Allegany- Southern Erie- Including the cities of Orchard Park, Rochester, Geneseo, Buffalo, Oswego, Batavia, Medina, Newark, Olean, Wellsville, Springville, Fair Haven, Jamestown, Canandaigua, Niagara Falls, and Warsaw 647 PM EDT Sat Jul 17 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL 2 AM EDT SUNDAY... The Flash Flood Watch continues for * Portions of central and western New York, including the following counties, in central New York, Northern Cayuga and Oswego. In western New York, Allegany, Cattaraugus, Chautauqua, Genesee, Livingston, Monroe, Niagara, Northern Erie, Ontario, Orleans, Southern Erie, Wayne and Wyoming. * Until 2 AM EDT Sunday. * Steady rainfall will become focused across the Finger Lakes and eastward this evening. Here an additional inch of rainfall will continue the potential for flooding. Lighter rain to the west, combined with continued runoff may continue to give rise to creeks and streams through the evening. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ DRT
276 WGUS61 KBUF 180227 FFABUF Flood Watch National Weather Service Buffalo NY 1027 PM EDT Sat Jul 17 2021 NYZ001>006-010>014-019>021-085-180330- /O.CAN.KBUF.FF.A.0002.000000T0000Z-210718T0600Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Niagara-Orleans-Monroe-Wayne-Northern Cayuga-Oswego-Northern Erie- Genesee-Wyoming-Livingston-Ontario-Chautauqua-Cattaraugus-Allegany- Southern Erie- Including the cities of Orchard Park, Rochester, Geneseo, Buffalo, Oswego, Batavia, Medina, Newark, Olean, Wellsville, Springville, Fair Haven, Jamestown, Canandaigua, Niagara Falls, and Warsaw 1027 PM EDT Sat Jul 17 2021 ...FLASH FLOOD WATCH IS CANCELLED... The Flash Flood Watch for portions of central New York and western New York, including the following areas, in central New York, Northern Cayuga and Oswego. In western New York, Allegany, Cattaraugus, Chautauqua, Genesee, Livingston, Monroe, Niagara, Northern Erie, Ontario, Orleans, Southern Erie, Wayne and Wyoming has been cancelled. The Flood Watch is cancelled. Additional flooding is no longer expected to pose a threat. Please continue to heed remaining road closures. $$ DRT
The office that day
Everything else NWS Buffalo, NY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 15, 8:06 PM EDT | Special Weather Statement | BUF | Erie | 24 min |
| Jul 15, 8:12 PM EDT | Special Weather Statement | BUF | Chautauqua | 63 min |
| Jul 15, 8:18 PM EDT | Severe Thunderstorm Warning | BUF | Chautauqua | 57 min |
| Jul 15, 9:21 PM EDT | Special Weather Statement | BUF | Cattaraugus | 54 min |
| Jul 15, 10:48 PM EDT | Special Marine Warning | BUF | 57 min | |
| Jul 15, 11:09 PM EDT | Special Weather Statement | BUF | Jefferson | 36 min |
| Jul 16, 2:13 PM EDT | Flash Flood Warning | BUF | Chautauqua | 5 hr |
| Jul 16, 2:59 PM EDT | Flash Flood Warning | BUF | Cattaraugus, Chautauqua | 4 hr |
| Jul 16, 4:45 PM EDT | Small Craft Advisory | BUF | 44 hr | |
| Jul 16, 4:49 PM EDT | Areal Flood Warning | BUF | Chautauqua | 6 hr |
| Jul 16, 7:14 PM EDT | Areal Flood Warning | BUF | Chautauqua | 6 hr |
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.