Alert archive / Pennsylvania / Severe Thunderstorm Watches in 2007
Severe Thunderstorm Watch 460
The Storm Prediction Center issued this severe thunderstorm watch at Jun 27, 2007, 7:26 PM EDT for 4 states. It was in force for 4 hr.
The area
The outline as issued.
The facts
- Issued
- Jun 27, 2007, 7:26 PM EDT (23:26 UTC)
- Expired
- Jun 27, 2007, 11:00 PM EDT
- In force
- 4 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 60 kt
All 57 counties
Greater Bridgeport Planning Region, CT, Naugatuck Valley Planning Region, CT, Northwest Hills Planning Region, CT, Bergen County, NJ, Essex County, NJ, Hudson County, NJ, Hunterdon County, NJ, Mercer County, NJ, Middlesex County, NJ, Monmouth County, NJ, Morris County, NJ, Passaic County, NJ, Somerset County, NJ, Sussex County, NJ, Union County, NJ, Warren County, NJ, Bronx County, NY, Dutchess County, NY, Kings County, NY, Nassau County, NY, New York County, NY, Orange County, NY, Putnam County, NY, Queens County, NY, Richmond County, NY, Rockland County, NY, Suffolk County, NY, Ulster County, NY, Westchester County, NY, Adams County, PA, Berks County, PA, Bucks County, PA, Carbon County, PA, Chester County, PA, Columbia County, PA, Cumberland County, PA, Dauphin County, PA, Delaware County, PA, Franklin County, PA, Fulton County, PA, Huntingdon County, PA, Juniata County, PA, Lancaster County, PA, Lebanon County, PA, Lehigh County, PA, Mifflin County, PA, Monroe County, PA, Montgomery County, PA, Montour County, PA, Northampton County, PA, Northumberland County, PA, Perry County, PA, Philadelphia County, PA, Schuylkill County, PA, Snyder County, PA, Union County, PA, York County, PA
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
- 5%
- Ten or more severe wind reports
- 60%
- One or more gusts of 65 knots or more
- 30%
- Ten or more severe hail reports
- 20%
- One or more hailstones of 2 inches or more
- 10%
- Six or more combined severe hail and wind reports
- 90%
Warnings issued inside it
19 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 27, 7:29 PM EDT | Severe Thunderstorm Warning | PHI | Sussex | 76 min |
| Jun 27, 7:29 PM EDT | Severe Thunderstorm Warning | CTP | Schuylkill | 46 min |
| Jun 27, 7:54 PM EDT | Flash Flood Warning | OKX | Queens | 3 hr |
| Jun 27, 7:57 PM EDT | Severe Thunderstorm Warning | CTP | Columbia, Montour | 63 min |
| Jun 27, 7:58 PM EDT | Severe Thunderstorm Warning | PHI | Lehigh | 62 min |
| Jun 27, 8:04 PM EDT | Severe Thunderstorm Warning | PHI | Monroe | 56 min |
| Jun 27, 8:18 PM EDT | Severe Thunderstorm Warning | PHI | Warren | 87 min |
| Jun 27, 8:28 PM EDT | Severe Thunderstorm Warning | OKX | Rockland, Westchester | 47 min |
| Jun 27, 8:33 PM EDT | Severe Thunderstorm Warning | PHI | Chester | 72 min |
| Jun 27, 8:34 PM EDT | Severe Thunderstorm Warning | OKX | Nassau | 21 min |
| Jun 27, 8:38 PM EDT | Severe Thunderstorm Warning | OKX | Bergen | 37 min |
| Jun 27, 8:56 PM EDT | Severe Thunderstorm Warning | PHI | Morris | 69 min |
| Jun 27, 9:10 PM EDT | Severe Thunderstorm Warning | PHI | Delaware | 65 min |
| Jun 27, 9:11 PM EDT | Severe Thunderstorm Warning | OKX | Greater Bridgeport Planning Region | 49 min |
| Jun 27, 9:19 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Lehigh | 86 min |
| Jun 27, 9:22 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster | 68 min |
| Jun 27, 9:38 PM EDT | Severe Thunderstorm Warning | PHI | Philadelphia | 67 min |
| Jun 27, 10:09 PM EDT | Severe Thunderstorm Warning | PHI | Mercer | 66 min |
| Jun 27, 10:13 PM EDT | Flash Flood Warning | OKX | Queens | 5 hr |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
Brookhaven, NY (KOKX), launched 12:00Z, 11.4 hours before the alert went out and 175 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
- 357 J/kg
- Mixed-layer CIN
- -152 J/kg
- Mixed-layer LCL
- 1418 m above ground
- 0-6 km bulk shear
- 11 kt
- 0-1 km storm-relative helicity
- -24 m²/s²
- 0-3 km storm-relative helicity
- 34 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 |
|---|---|---|---|---|
| Jun 27, 12:58 PM EDT | Severe Thunderstorm Watch | SPC | Greater Bridgeport Planning Region, Northwest Hills Planning Region, Naugatuck Valley Planning Region | 7 hr |
| Jun 27, 4:42 PM EDT | Severe Thunderstorm Watch | SPC | Capitol Planning Region, Northeastern Connecticut Planning Region | 4 hr |
| Jun 27, 11:44 AM EDT | Mesoscale Discussion | SPC | Allegany, Cattaraugus, Cayuga, Chemung, Cortland, Erie and 14 more | 2 hr |
| Jun 27, 2:42 PM EDT | Severe Thunderstorm Watch | SPC | Clinton, Essex, Franklin, St. Lawrence | 7 hr |
Nearby
Severe Thunderstorm Watches in Pennsylvania, 2007Severe Thunderstorm Watches in New Jersey, 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.