Alert archive / New York / Tornado Watches in 2024

Tornado Watch 617

August 9, 20245 states

The Storm Prediction Center issued this tornado watch at Aug 9, 2024, 1:27 PM EDT for 5 states. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued
Aug 9, 2024, 1:27 PM EDT (17:27 UTC)
Expired
Aug 9, 2024, 7:57 PM EDT
In force
7 hr
Issued by
the Storm Prediction Center
Largest hail expected
0.5 in
Strongest gust expected
55 kt
All 54 counties

Berkshire County, MA, Franklin County, MA, Hampden County, MA, Hampshire County, MA, Bergen County, NJ, Essex County, NJ, Hunterdon County, NJ, Mercer County, NJ, Middlesex County, NJ, Morris County, NJ, Passaic County, NJ, Somerset County, NJ, Sussex County, NJ, Union County, NJ, Warren County, NJ, Albany County, NY, Chenango County, NY, Columbia County, NY, Delaware County, NY, Dutchess County, NY, Essex County, NY, Fulton County, NY, Greene County, NY, Hamilton County, NY, Herkimer County, NY, Madison County, NY, Montgomery County, NY, Oneida County, NY, Orange County, NY, Otsego County, NY, Putnam County, NY, Rensselaer County, NY, Rockland County, NY, Saratoga County, NY, Schenectady County, NY, Schoharie County, NY, Sullivan County, NY, Ulster County, NY, Warren County, NY, Washington County, NY, Westchester County, NY, Bucks County, PA, Carbon County, PA, Lackawanna County, PA, Lehigh County, PA, Monroe County, PA, Northampton County, PA, Pike County, PA, Wayne County, PA, Addison County, VT, Bennington County, VT, Rutland County, VT, Windham County, VT, Windsor County, VT

The radar

The Albany radar (KENX), 22 km from the middle of the area, began a volume at 17:26 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.

What SPC expected

The probabilities SPC published with the watch, for the watch area over its life.

Two or more tornadoes
40%
One or more EF2 to EF5 tornadoes
5%
Ten or more severe wind reports
20%
One or more gusts of 65 knots or more
20%
Ten or more severe hail reports
5%
One or more hailstones of 2 inches or more
5%
Six or more combined severe hail and wind reports
30%

Warnings issued inside it

11 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
Aug 9, 1:33 PM EDTFlash Flood WarningBGMBroome, Chenango, Delaware, Otsego4 hr
Aug 9, 2:49 PM EDTFlash Flood WarningBGMDelaware, Otsego, Sullivan3 hr
Aug 9, 2:50 PM EDTFlash Flood WarningPHILehigh, Northampton2 hr
Aug 9, 3:02 PM EDTFlash Flood WarningALYAlbany, Greene, Schoharie, Ulster3 hr
Aug 9, 3:31 PM EDTFlash Flood WarningPHIWarren108 min
Aug 9, 3:49 PM EDTFlash Flood WarningALYAlbany, Montgomery, Rensselaer, Saratoga, Schenectady, Schoharie3 hr
Aug 9, 3:50 PM EDTFlash Flood WarningPHIBucks, Montgomery2 hr
Aug 9, 4:11 PM EDTFlash Flood WarningPHIWarren100 min
Aug 9, 4:35 PM EDTTornado WarningOKXOrange25 min
Aug 9, 5:23 PM EDTFlash Flood WarningALYRensselaer, Washington2 hr
Aug 9, 5:30 PM EDTFlash Flood WarningPHIMercer83 min

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

The nearest sounding before it

Albany, NY (KALY), launched 12:00Z, 5.5 hours before the alert went out and 4 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.

Skew-T log-pSkew-T log-p diagram, Albany, NY at 12:00Z on 2024-08-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 117 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Albany, NY at 12:00Z on 2024-08-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 486 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
117 J/kg
Mixed-layer CIN
-118 J/kg
Mixed-layer LCL
464 m above ground
0-6 km bulk shear
48 kt
0-1 km storm-relative helicity
486 m²/s²
0-3 km storm-relative helicity
525 m²/s²
Significant tornado parameter
0.0
Supercell composite
2.5

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 9, 2:27 PM EDTMesoscale DiscussionSPCBerkshire, Franklin93 min
Aug 9, 4:57 PM EDTMesoscale DiscussionSPCBerkshire93 min
Aug 9, 6:17 AM EDTTornado WatchSPCAtlantic, Burlington, Camden, Cape May, Cumberland, Essex and 11 more8 hr
Aug 9, 10:26 AM EDTMesoscale DiscussionSPCAtlantic, Bergen, Burlington, Camden, Cape May, Cumberland and 13 more94 min
Aug 8, 11:04 PM EDTMesoscale DiscussionSPCAdams, Chester, Lancaster, York116 min
Aug 9, 4:38 AM EDTMesoscale DiscussionSPCAdams, Berks, Chester, Cumberland, Dauphin, Franklin and 7 more3 hr

Nearby

Tornado Watches in New York, 2024Tornado Watches in New Jersey, 2024Tornado Watches in Pennsylvania, 2024Every tornado watch in 2024

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.