Alert archive / Pennsylvania / Severe Thunderstorm Watches in 2007
Severe Thunderstorm Watch 487
The Storm Prediction Center issued this severe thunderstorm watch at Jul 5, 2007, 1:00 PM EDT for 19 counties in New York; 22 counties in Pennsylvania. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 5, 2007, 1:00 PM EDT (17:00 UTC)
- Expired
- Jul 5, 2007, 8:00 PM EDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 60 kt
All 41 counties
Allegany County, NY, Broome County, NY, Cattaraugus County, NY, Cayuga County, NY, Chemung County, NY, Chenango County, NY, Cortland County, NY, Delaware County, NY, Madison County, NY, Oneida County, NY, Onondaga County, NY, Otsego County, NY, Schuyler County, NY, Seneca County, NY, Steuben County, NY, Sullivan County, NY, Tioga County, NY, Tompkins County, NY, Yates County, NY, Bradford County, PA, Cameron County, PA, Clarion County, PA, Clinton County, PA, Crawford County, PA, Elk County, PA, Erie County, PA, Forest County, PA, Lackawanna County, PA, Luzerne County, PA, Lycoming County, PA, McKean County, PA, Mercer County, PA, Pike County, PA, Potter County, PA, Sullivan County, PA, Susquehanna County, PA, Tioga County, PA, Venango County, PA, Warren County, PA, Wayne County, PA, Wyoming County, PA
The radar
The Binghamton radar (KBGM), 90 km from the middle of the area, began a volume at 17:03 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
- 50%
- 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
- 5%
- Six or more combined severe hail and wind reports
- 95%
Warnings issued inside it
6 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 5, 3:14 PM EDT | Severe Thunderstorm Warning | BGM | Broome, Chenango | 31 min |
| Jul 5, 3:37 PM EDT | Severe Thunderstorm Warning | PBZ | Mercer | 53 min |
| Jul 5, 3:45 PM EDT | Severe Thunderstorm Warning | BGM | Chenango | 21 min |
| Jul 5, 3:58 PM EDT | Severe Thunderstorm Warning | BGM | Susquehanna | 21 min |
| Jul 5, 4:50 PM EDT | Severe Thunderstorm Warning | BGM | Wayne | 21 min |
| Jul 5, 6:45 PM EDT | Severe Thunderstorm Warning | BGM | Wyoming | 45 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, 5.0 hours before the alert went out and 153 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
- 16 J/kg
- Mixed-layer CIN
- -105 J/kg
- Mixed-layer LCL
- 869 m above ground
- 0-6 km bulk shear
- 42 kt
- 0-1 km storm-relative helicity
- 21 m²/s²
- 0-3 km storm-relative helicity
- 52 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 |
|---|---|---|---|---|
| Jul 5, 12:17 PM EDT | Mesoscale Discussion | SPC | Allegany, Broome, Cattaraugus, Chemung, Chenango, Cortland and 8 more | 118 min |
| Jul 5, 3:10 PM EDT | Mesoscale Discussion | SPC | Albany, Columbia, Dutchess, Greene, Montgomery, Orange and 4 more | 65 min |
| Jul 5, 3:34 PM EDT | Severe Thunderstorm Watch | SPC | Albany, Columbia, Dutchess, Fulton, Greene, Montgomery and 10 more | 5 hr |
| Jul 5, 4:12 PM EDT | Mesoscale Discussion | SPC | Albany, Columbia, Dutchess, Greene, Montgomery, Orange and 4 more | 2 hr |
| Jul 5, 11:40 AM EDT | Mesoscale Discussion | SPC | Allegheny, Bedford, Blair, Cambria, Fayette, Fulton and 6 more | 2 hr |
Nearby
Severe Thunderstorm Watches in Pennsylvania, 2007Severe Thunderstorm Watches in New York, 2007Every severe thunderstorm watch in 2007
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.