Alert archive / New York / Severe Thunderstorm Watches in 2021
Severe Thunderstorm Watch 432
The Storm Prediction Center issued this severe thunderstorm watch at Aug 12, 2021, 1:42 PM EDT for 23 counties in New York; 7 counties in Pennsylvania. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 12, 2021, 1:42 PM EDT (17:42 UTC)
- Expired
- Aug 12, 2021, 8:00 PM EDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1 in
- Strongest gust expected
- 60 kt
All 30 counties
Albany County, NY, Broome County, NY, Chenango County, NY, Columbia County, NY, Cortland County, NY, Delaware County, NY, Fulton County, NY, Greene County, NY, Hamilton County, NY, Herkimer County, NY, Madison County, NY, Montgomery County, NY, Oneida County, NY, Otsego County, NY, Rensselaer County, NY, Saratoga County, NY, Schenectady County, NY, Schoharie County, NY, Sullivan County, NY, Tioga County, NY, Ulster County, NY, Warren County, NY, Washington County, NY, Bradford County, PA, Lackawanna County, PA, Luzerne County, PA, Pike County, PA, Susquehanna County, PA, Wayne County, PA, Wyoming County, PA
The radar
The Binghamton radar (KBGM), 67 km from the middle of the area, began a volume at 17:46 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
- 5%
- One or more EF2 to EF5 tornadoes
- 2%
- Ten or more severe wind reports
- 70%
- One or more gusts of 65 knots or more
- 20%
- Ten or more severe hail reports
- 20%
- One or more hailstones of 2 inches or more
- 5%
- Six or more combined severe hail and wind reports
- 90%
Warnings issued inside it
9 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 12, 1:51 PM EDT | Severe Thunderstorm Warning | ALY | Albany, Montgomery, Saratoga, Schenectady, Schoharie | 54 min |
| Aug 12, 2:14 PM EDT | Severe Thunderstorm Warning | BGM | Lackawanna, Luzerne, Wyoming | 46 min |
| Aug 12, 2:42 PM EDT | Severe Thunderstorm Warning | ALY | Albany, Rensselaer, Saratoga, Schenectady | 48 min |
| Aug 12, 2:59 PM EDT | Severe Thunderstorm Warning | BGM | Lackawanna, Luzerne, Pike, Wayne, Wyoming | 31 min |
| Aug 12, 3:12 PM EDT | Severe Thunderstorm Warning | ALY | Albany, Columbia, Rensselaer | 18 min |
| Aug 12, 3:28 PM EDT | Severe Thunderstorm Warning | BGM | Lackawanna, Pike, Wayne | 47 min |
| Aug 12, 3:29 PM EDT | Severe Thunderstorm Warning | ALY | Columbia, Rensselaer | 61 min |
| Aug 12, 3:44 PM EDT | Severe Thunderstorm Warning | ALY | Albany, Columbia, Greene | 46 min |
| Aug 12, 4:29 PM EDT | Severe Thunderstorm Warning | ALY | Columbia | 61 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, 5.7 hours before the alert went out and 119 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
- 58 J/kg
- Mixed-layer CIN
- -212 J/kg
- Mixed-layer LCL
- 1178 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- 62 m²/s²
- 0-3 km storm-relative helicity
- 56 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 12, 11:03 AM EDT | Mesoscale Discussion | SPC | Albany, Broome, Chenango, Clinton, Cortland, Delaware and 19 more | 2 hr |
| Aug 12, 12:19 PM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Blair, Butler, Cambria, Cameron and 20 more | 116 min |
| Aug 12, 1:11 PM EDT | Severe Thunderstorm Watch | SPC | Armstrong, Bedford, Blair, Cambria, Cameron, Centre and 27 more | 9 hr |
| Aug 12, 3:17 PM EDT | Mesoscale Discussion | SPC | Allegheny, Beaver, Butler, Crawford, Lawrence, Mercer and 1 more | 58 min |
| Aug 12, 3:48 PM EDT | Severe Thunderstorm Watch | SPC | Allegheny, Armstrong, Beaver, Butler, Clarion, Crawford and 11 more | 6 hr |
| Aug 12, 6:22 PM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Blair, Butler, Cambria and 21 more | 83 min |
Nearby
Severe Thunderstorm Watches in New York, 2021Severe Thunderstorm Watches in Pennsylvania, 2021Every severe thunderstorm 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.