Alert archive / New York / Severe Thunderstorm Watches in 2015
Severe Thunderstorm Watch 92
The Storm Prediction Center issued this severe thunderstorm watch at Apr 20, 2015, 7:56 PM EDT for 6 counties in New Jersey; 10 counties in New York; 10 counties in Pennsylvania. It was in force for 4 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 20, 2015, 7:56 PM EDT (23:56 UTC)
- Expired
- Apr 20, 2015, 11:54 PM EDT
- In force
- 4 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 60 kt
All 26 counties
Hunterdon County, NJ, Mercer County, NJ, Morris County, NJ, Somerset County, NJ, Sussex County, NJ, Warren County, NJ, Broome County, NY, Cayuga County, NY, Chemung County, NY, Cortland County, NY, Schuyler County, NY, Seneca County, NY, Steuben County, NY, Tioga County, NY, Tompkins County, NY, Yates County, NY, Bradford County, PA, Carbon County, PA, Lackawanna County, PA, Luzerne County, PA, Monroe County, PA, Northampton County, PA, Pike County, PA, Susquehanna County, PA, Wayne County, PA, Wyoming County, PA
The radar
The Binghamton radar (KBGM), 53 km from the middle of the area, began a volume at 23:58 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
- 10%
- One or more EF2 to EF5 tornadoes
- 2%
- Ten or more severe wind reports
- 20%
- One or more gusts of 65 knots or more
- 5%
- Ten or more severe hail reports
- 30%
- One or more hailstones of 2 inches or more
- 10%
- Six or more combined severe hail and wind reports
- 60%
Warnings issued inside it
1 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 20, 8:26 PM EDT | Severe Thunderstorm Warning | BGM | Steuben, Yates | 49 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
Buffalo Intl Airport, NY (KBUF), launched 12:00Z, 11.9 hours before the alert went out and 211 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
- 982 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 429 m²/s²
- 0-3 km storm-relative helicity
- 437 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 |
|---|---|---|---|---|
| Apr 20, 3:08 PM EDT | Tornado Watch | SPC | Camden, Cumberland, Gloucester, Salem | 9 hr |
| Apr 20, 3:23 PM EDT | Mesoscale Discussion | SPC | Allegany, Broome, Cattaraugus, Cayuga, Chemung, Cortland and 16 more | 2 hr |
| Apr 20, 7:31 PM EDT | Mesoscale Discussion | SPC | Broome, Cayuga, Chemung, Chenango, Cortland, Delaware and 5 more | 2 hr |
| Apr 20, 1:54 PM EDT | Mesoscale Discussion | SPC | Adams, Bedford, Cumberland, Franklin, Fulton, Lancaster and 1 more | 3 hr |
| Apr 20, 5:01 PM EDT | Mesoscale Discussion | SPC | Adams, Bedford, Berks, Blair, Chester, Cumberland and 10 more | 119 min |
| Apr 20, 5:57 PM EDT | Mesoscale Discussion | SPC | Bradford, Cameron, Centre, Clinton, Columbia, Luzerne and 9 more | 2 hr |
Nearby
Severe Thunderstorm Watches in New York, 2015Severe Thunderstorm Watches in Pennsylvania, 2015Severe Thunderstorm Watches in New Jersey, 2015Every severe thunderstorm watch in 2015
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.